WO2022158347A1 - 自己診断回路、および半導体装置 - Google Patents
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- 239000004065 semiconductor Substances 0.000 title claims description 6
- 238000001514 detection method Methods 0.000 claims abstract description 152
- 230000005856 abnormality Effects 0.000 claims abstract description 82
- 238000004092 self-diagnosis Methods 0.000 claims description 16
- 102100029824 ADP-ribosyl cyclase/cyclic ADP-ribose hydrolase 2 Human genes 0.000 abstract description 9
- 101000794082 Homo sapiens ADP-ribosyl cyclase/cyclic ADP-ribose hydrolase 2 Proteins 0.000 abstract description 9
- 101001099051 Homo sapiens GPI inositol-deacylase Proteins 0.000 abstract description 9
- 239000003990 capacitor Substances 0.000 description 18
- 230000002159 abnormal effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- 238000013021 overheating Methods 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 238000003745 diagnosis Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/30—Marginal testing, e.g. by varying supply voltage
- G01R31/3004—Current or voltage test
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/317—Testing of digital circuits
- G01R31/3181—Functional testing
- G01R31/3187—Built-in tests
Definitions
- the present disclosure relates to self-diagnostic circuits.
- UVLO low voltage in the power supply voltage of an IC
- TSD function for detecting and protecting an overheating state of an IC chip
- an object of the present disclosure is to provide a self-diagnostic circuit that can realize an effective configuration for diagnosing whether a circuit that detects an abnormality is functioning normally.
- One aspect of the present disclosure is a self-diagnostic circuit that diagnoses an abnormality detection circuit having a first comparator capable of inputting a voltage based on an abnormality detection target voltage and a first reference voltage, a voltage switching unit that switches and outputs a voltage level based on the second reference voltage; a first path switching unit that switches between a path through which the voltage output from the voltage switching unit is input to the first comparator and a path through which the voltage based on the abnormality detection target voltage is input to the first comparator; a control unit that controls the voltage switching unit and the path switching unit; and a self-diagnostic circuit.
- the self-diagnostic circuit of the present disclosure it is possible to realize an effective configuration for diagnosing whether the circuit that detects an abnormality is functioning normally.
- FIG. 1 is a diagram showing a configuration for external connection of a PMIC according to an exemplary embodiment of the present disclosure.
- FIG. 2 is a diagram showing the internal configuration of a PMIC according to an exemplary embodiment of the present disclosure;
- FIG. 3 is a diagram showing the configuration of a self-diagnostic circuit for diagnosing each of the undervoltage detection circuit and the overvoltage detection circuit.
- FIG. 4 is a timing chart showing an operation example when the PMIC is activated.
- FIG. 5 is a timing chart showing an example of the self-diagnosis operation of the voltage reduction detection circuit in analog self-diagnosis mode (A-BIST) or the like.
- FIG. 6 is a diagram showing the configuration of an abnormality detection circuit according to a comparative example.
- FIG. 6 is a diagram showing the configuration of an abnormality detection circuit according to a comparative example.
- FIG. 6 shows the configuration of a reduced voltage detection circuit 101 as an abnormality detection circuit.
- FIG. 6 also shows the configuration of the self-diagnosis circuit BST101.
- the circuit configuration shown in FIG. 6 is provided in the power supply IC.
- the power supply IC has a DC/DC converter function.
- the voltage drop detection circuit 101 is a circuit that detects a voltage drop of the output voltage Vo (DC output voltage) due to the DC/DC converter function.
- the voltage drop detection circuit 101 includes a comparator CMP11, an inverter IV11, resistors R11 to R15, and an NMOS transistor (N-channel MOSFET (metal-oxide-semiconductor field-effect transistor)) NM11. is doing.
- resistor R11 One end of the resistor R11 is connected to the FB terminal. An output voltage Vo is applied to the FB terminal. The other end of resistor R11 is connected to one end of resistor R12 at node N11.
- the node N11 is connected to the non-inverting input terminal (+) of the comparator CMP11.
- One end of the resistor R13 is connected to the application end of the reference voltage Vref.
- the other end of resistor R13 is connected to one end of resistor R14 at node N13.
- the node N13 is connected to the inverting input terminal (-) of the comparator CMP11.
- the output end of comparator CMP11 is connected to the input end of inverter IV11 at node N15.
- the node N15 is connected to the gate of the NMOS transistor NM11.
- the source of the NMOS transistor NM11 is connected to the ground potential application terminal.
- a drain of the NMOS transistor NM11 is connected to a node N14 to which the other end of the resistor R14 and one end of the resistor R15 are connected.
- the other end of the resistor R15 is connected to the ground potential application end.
- the self-diagnostic circuit BST101 has an NMOS transistor NM12, a resistor R16, and a control logic section 100.
- One end of resistor R16 is connected to the other end of resistor R12 at node N12.
- the other end of the resistor R16 is connected to the ground potential application end.
- the drain of NMOS transistor NM12 is connected to node N12.
- the source of the NMOS transistor NM12 is connected to the ground potential application terminal.
- the control logic unit 100 applies the BIST signal Bst12 as a gate signal to the gate of the NMOS transistor NM12.
- the BIST signal Bst12 is Low and the NMOS transistor NM12 is off.
- the comparator input signal CMP11INp generated at the node N11 by dividing the output voltage Vo by the resistors R11, R12, and R16 is input to the non-inverting input terminal (+) of the comparator CMP11.
- the NMOS transistor NM11 and the resistor R15 are configured for a hysteresis function. Specifically, when the output of the comparator CMP11 is Low, the NMOS transistor NM11 is in the OFF state, and the comparator input signal CMP11INn generated at the node N13 by dividing the reference voltage Vref by the resistors R13 to R15 is the inverted input of the comparator CMP11. Entered at the end (-).
- the NMOS transistor NM11 When the output of the comparator CMP11 is High, the NMOS transistor NM11 is on, and the comparator input signal CMP11INn generated at the node N13 by dividing the reference voltage Vref by the resistors R13 and R14 is applied to the inverting input terminal (-) of the comparator CMP11. is entered.
- the voltage reduction detection signal UVD which is the output of the inverter IV11
- the comparator input signal CMP11INp exceeds the comparator input signal CMP11INn and the output of the comparator CMP11 becomes High
- the voltage reduction detection signal UVD becomes Low.
- the control logic unit 100 determines that the output voltage Vo is in a voltage reduction abnormal state based on the voltage reduction detection signal UVD that has become High, and performs a protection operation. .
- the control logic unit 100 sequentially switches and outputs the BIST signal Bst12 of different levels (Low, High).
- the BIST signal Bst12 is Low
- the NMOS transistor NM12 is in the OFF state
- the comparator input signal CMP11INp generated at the node N11 by dividing the output voltage Vo by the resistors R11, R12, and R16 is applied to the non-inverting input terminal (+ ).
- the NMOS transistor NM12 When the BIST signal Bst12 is High, the NMOS transistor NM12 is on, and the comparator input signal CMP11INp generated at the node N11 by dividing the output voltage Vo by the resistors R11 and R12 is the non-inverting input terminal (+ ).
- the comparator CMP11 when the comparator CMP11 is operating normally, after the power supply IC starts up and the output voltage Vo rises, in the BIST mode, if the BIST signal Bst12 is Low, the output of the comparator CMP11 becomes High and the voltage is reduced. The detection signal UVD becomes Low. On the other hand, in the BIST mode, when the BIST signal Bst12 is High, the output of the comparator CMP11 becomes Low and the voltage reduction detection signal UVD becomes High.
- the self-diagnostic circuit BST101 forcibly switches the level of the comparator input signal CMP11INp to detect whether or not the level of the voltage reduction detection signal UVD is switched, so that the voltage reduction detection circuit 101 can operate normally. It is possible to determine whether
- the self-diagnostic operation described above is performed in a state where the output voltage Vo has risen and stabilized.
- the self-diagnostic operation takes a certain amount of time, even if the abnormality detection function is abnormal, the abnormality detection function will be determined to be abnormal by the self-diagnosis and the abnormal output will not be produced until the IC is shut down. There is a possibility that the voltage Vo may be output.
- the self-diagnostic operation may not operate normally depending on the output voltage Vo. For example, when the output voltage Vo is 0 V at startup, in the configuration shown in FIG. 6, even if the level of the BIST signal Bst12 is switched, the comparator input signal CMP11INp is only 0 V, and the output logic of the comparator CMP11 cannot be switched. . Therefore, the self-diagnostic operation becomes impossible.
- the abnormality detection target voltage (the output voltage Vo in the example of FIG. 6), which is the target of abnormality detection by the abnormality detection circuit.
- FIG. 1 is a diagram showing a configuration for external connection of PMIC 1 according to an exemplary embodiment of the present disclosure.
- FIG. 2 is a diagram showing the internal configuration of the PMIC1.
- the PMIC 1 shown in FIGS. 1 and 2 is a semiconductor device (power supply IC package) that includes a plurality of power supply circuits for supplying power to a CMOS sensor device 30 mounted on a vehicle.
- the CMOS sensor device 30 is mounted on an in-vehicle camera system.
- the PMIC 1 includes external terminals for establishing electrical connection with the outside, such as a VIN terminal, a VREG50 terminal, a VREG15 terminal, a BOOT1 terminal, a SW1 terminal, a PGND1 terminal, an FB1 terminal, an FB2 terminal, and a PVIN2 terminal. terminal, SW2 terminal, PGND23 terminal, SW3 terminal, PVIN3 terminal, FB3 terminal, VO4 terminal, RSTOUT terminal, WAROUT terminal, SCL terminal, SDA terminal, and GND terminal.
- the PMIC 1 includes an internal voltage generator 2, an internal voltage generator 3, a reference voltage generator 4, a power supply voltage UVLO (Under Voltage Lock Out) circuit 5, and an internal voltage UVLO circuit 6. , an internal voltage UVLO circuit 7, an OTP (One Time Programmable ROM) 8, a TSD (Thermal Shut Down) circuit 9, a TW (Thermal Warning) circuit 10, a first DC/DC circuit 11, and a second DC/DC circuit 12, a third DC/DC circuit 13, an LDO (Low Dropout) 14, a control logic unit 15, an I2C input/output unit 16, a reset input/output unit 17, and a warning input/output unit 18.
- the PMIC 1 further includes a first overvoltage detection circuit 19, a first undervoltage detection circuit 20, a second overvoltage detection circuit 21, a second undervoltage detection circuit 22, and a second undervoltage protection circuit.
- the VIN terminal is connected to the application end of the power supply voltage (input power supply voltage) Vin.
- the internal voltage Vreg 50 serves as power supply voltages for the internal voltage generator 3 and the first DC/DC circuit 11 .
- the internal voltage Vreg50 can be externally output from the VREG50 terminal.
- the internal voltage Vreg15 becomes the power supply voltage for each part in the PMIC1.
- Internal voltage Vreg15 is used as a reference voltage in first, second and third DC/DC circuits 11, 12 and 13 and LDO14.
- the internal voltage Vreg15 can be externally output from the VREG15 terminal.
- the reference voltage generator 4 generates the first reference voltage Vref1 and the second reference voltage Vref2 based on the internal voltage Vreg15.
- the first reference voltage Vref1 is used as a reference voltage for various fault detection circuits and fault protection circuits in the PMIC1.
- the second reference voltage Vref2 is used as a reference voltage for a self-diagnostic circuit, which will be described later.
- the power supply voltage UVLO circuit 5 is an anomaly protection circuit that detects low voltage anomalies in the power supply voltage Vin.
- the power supply voltage UVLO circuit 5 outputs a UVLO signal UVLOVIN to the control logic unit 15 .
- the control logic unit 15 shuts down the IC when the low voltage abnormality of the power supply voltage Vin is detected.
- the internal voltage UVLO circuit 6 is an anomaly protection circuit that detects low voltage anomalies in the internal voltage Vreg50.
- the internal voltage UVLO circuit 6 outputs a UVLO signal UVLOREG50 to the control logic section 15.
- FIG. The control logic unit 15 shifts to the safe mode state when the low voltage abnormality of the internal voltage Vreg50 is detected.
- the internal voltage UVLO circuit 7 is an anomaly protection circuit that detects low voltage anomalies in the internal voltage Vreg15.
- the internal voltage UVLO circuit 7 outputs a UVLO signal UVLOREG15 to the control logic section 15 .
- the control logic unit 15 shifts to a standby state when a low voltage abnormality of the internal voltage Vreg15 is detected.
- OTP8 is a ROM that can be written only once, and stores various data. Data is read from the OTP 8 by the control logic unit 15 .
- the TSD circuit 9 is an overheat protection circuit and outputs an overheat protection signal TSD to the control logic section 15 .
- a first predetermined temperature eg, 175° C.
- the TW circuit 10 is an overheat detection circuit and outputs an overheat warning signal TW to the control logic section 15 .
- a second predetermined temperature eg, 140° C.
- the first DC/DC circuit 11 configures a first DC/DC converter 41 (FIG. 1) together with an inductor L1, an output capacitor Co1, and a boot capacitor Cb1 arranged outside the PMIC1.
- the first DC/DC converter 41 is a step-down converter (Buck Converter) that inputs a power supply voltage Vin (eg, 15.0 V) and outputs an output voltage Vo1 (eg, 3.7 V).
- the SW1 terminal is a terminal to which the switching output of the first DC/DC circuit 11 is applied.
- the SW1 terminal is connected to one end of the inductor L1.
- the other end of inductor L1 is connected to one end of output capacitor Co1.
- the other end of the output capacitor Co1 is connected to the PGND1 terminal.
- a PGND1 terminal is a ground terminal for the first DC/DC circuit 11 and is connected to a ground potential application terminal.
- a boot capacitor Cb1 constitutes a bootstrap.
- One end of the boot capacitor Cb1 is connected to the BOOT1 terminal.
- the other end of the boot capacitor Cb1 is connected to the SW1 terminal.
- a boot voltage generated at the BOOT1 terminal is supplied to the high side driver in the first DC/DC circuit 11 .
- an output voltage Vo1 is generated at the node where the inductor L1 and the output capacitor Co1 are connected.
- the output voltage Vo1 is applied to the PVIN2 terminal and the PVIN3 terminal and used as the input power supply for the second DC/DC circuit 12 and the third DC/DC circuit 13, respectively.
- the output voltage Vo1 is applied to the FB1 terminal.
- the FB1 terminal is a terminal for feeding back the output voltage Vo1 to the first DC/DC circuit 11 .
- the output voltage Vo1 applied to the FB1 terminal is also used as an input power source for the LDO 14.
- the second DC/DC circuit 12 constitutes a second DC/DC converter 42 (FIG. 1) together with an inductor L2 and an output capacitor Co2 arranged outside the PMIC1.
- the second DC/DC converter 42 is a step-down converter (Buck Converter) that receives the output voltage Vo1 applied to the PVIN2 terminal and outputs an output voltage Vo2 (for example, 1.1 V).
- the SW2 terminal is a terminal to which the switching output of the second DC/DC circuit 12 is applied.
- the SW2 terminal is connected to one end of the inductor L2.
- the other end of inductor L2 is connected to one end of output capacitor Co2.
- the other end of the output capacitor Co2 is connected to the PGND23 terminal.
- the PGND 23 terminal is connected to the ground potential application end and serves as a ground terminal for the second DC/DC circuit 12 and the third DC/DC circuit 13 .
- an output voltage Vo2 is generated at the node where the inductor L2 and the output capacitor Co2 are connected.
- the output voltage Vo2 is supplied to the CMOS sensor device 30 as a power supply voltage.
- the output voltage Vo2 is applied to the FB2 terminal.
- the FB2 terminal is a terminal for feeding back the output voltage Vo2 to the second DC/DC circuit 12 .
- the third DC/DC circuit 13 constitutes a third DC/DC converter 43 (FIG. 1) together with an inductor L3 and an output capacitor Co3 arranged outside the PMIC1.
- the third DC/DC converter 43 is a step-down converter (Buck Converter) that receives the output voltage Vo1 applied to the PVIN3 terminal and outputs an output voltage Vo3 (for example, 1.8V).
- the SW3 terminal is a terminal to which the switching output of the third DC/DC circuit 13 is applied.
- the SW3 terminal is connected to one end of the inductor L3.
- the other end of inductor L3 is connected to one end of output capacitor Co3.
- the other end of the output capacitor Co3 is connected to the PGND23 terminal.
- an output voltage Vo3 is generated at the node where the inductor L3 and the output capacitor Co3 are connected.
- the output voltage Vo3 is supplied to the CMOS sensor device 30 as a power supply voltage.
- the output voltage Vo3 is applied to the FB3 terminal.
- the FB3 terminal is a terminal for feeding back the output voltage Vo3 to the third DC/DC circuit 13 .
- the LDO 14 is a linear regulator that receives the output voltage Vo1 applied to the FB1 terminal and outputs an output voltage Vo4 (eg, 3.3 V).
- Vo4 an output voltage
- the output voltage Vo4 is externally output from the VO4 terminal and supplied to the CMOS sensor device 30 as a power supply voltage.
- the VO4 terminal is also used as a terminal for feeding back the output voltage Vo4 to the LDO14.
- the control logic unit 15 is a control unit that controls the PMIC 1 in an integrated manner.
- the I2C input/output unit 16 performs I2C communication with the CMOS sensor device 30 via the SDA terminal and SCL terminal.
- I2C is a type of serial interface.
- the SDA terminal is used for input/output of serial interface data.
- the SCL terminal is used to input the serial interface clock.
- the reset input/output unit 17 outputs the reset output signal Rsto to the CMOS sensor device 30 via the RSTOUT terminal.
- the reset output signal Rsto is set to a level indicating an abnormality (for example, Low) when an abnormality is detected by the abnormality protection circuit.
- the warning input/output unit 18 outputs the warning output signal Wo to the CMOS sensor device 30 via the WAROUT terminal.
- the warning output signal Wo is set to a level indicating an abnormality (for example, Low) when an abnormality is detected by an abnormality detection circuit or an abnormality protection circuit.
- the first overvoltage detection circuit 19, the second overvoltage detection circuit 21, the third overvoltage detection circuit 24, and the fourth overvoltage detection circuit 27 are abnormality detection circuits that detect an overvoltage abnormality.
- the first overvoltage detection circuit 19 is a circuit that detects an overvoltage of the output voltage Vo1 applied to the FB1 terminal, and outputs an overvoltage detection signal OVD1.
- the second overvoltage detection circuit 21 is a circuit for detecting an overvoltage of the output voltage Vo2 applied to the FB2 terminal, and outputs an overvoltage detection signal OVD2.
- the third overvoltage detection circuit 24 is a circuit for detecting an overvoltage of the output voltage Vo3 applied to the FB3 terminal, and outputs an overvoltage detection signal OVD3.
- the fourth overvoltage detection circuit 27 is a circuit for detecting an overvoltage of the output voltage Vo4 applied to the VO4 terminal, and outputs an overvoltage detection signal OVD4.
- the first reduced voltage detection circuit 20, the second reduced voltage detection circuit 22, the third reduced voltage detection circuit 25, and the fourth reduced voltage detection circuit 28 are abnormality detection circuits that detect a reduced voltage abnormality.
- the first voltage drop detection circuit 20 is a circuit that detects a voltage drop of the output voltage Vo1 applied to the FB1 terminal, and outputs a voltage drop detection signal UVD1.
- the second voltage drop detection circuit 22 is a circuit that detects voltage drop of the output voltage Vo2 applied to the FB2 terminal, and outputs a voltage drop detection signal UVD2.
- the third voltage drop detection circuit 25 is a circuit for detecting a voltage drop of the output voltage Vo3 applied to the FB3 terminal, and outputs a voltage drop detection signal UVD3.
- the fourth voltage drop detection circuit 28 is a circuit for detecting a voltage drop of the output voltage Vo4 applied to the VO4 terminal, and outputs a voltage drop detection signal UVD4.
- the TW circuit 10 is an abnormality detection circuit that detects an overheating abnormality.
- the control logic unit 15 When an abnormality is detected by any of the above-described abnormality detection circuits, the control logic unit 15 continues the active state (normal operation state), but sets the warning output signal Wo to a level indicating abnormality (for example, Low). , alerts the CMOS sensor device 30 . At this time, the reset output signal Rsto is set to a level indicating normality (for example, High).
- the second undervoltage protection circuit 23, the third undervoltage protection circuit 26, and the fourth undervoltage protection circuit 29 are abnormality protection circuits that detect undervoltage abnormality.
- the second undervoltage protection circuit 23 is a circuit that detects a voltage drop in the output voltage Vo2 applied to the FB2 terminal, and outputs a undervoltage protection signal UVP2.
- the third under-voltage protection circuit 26 is a circuit that detects a voltage drop in the output voltage Vo3 applied to the FB3 terminal, and outputs a under-voltage protection signal UVP3.
- the fourth undervoltage protection circuit 29 is a circuit for detecting a voltage reduction of the output voltage Vo4 applied to the VO4 terminal, and outputs a undervoltage protection signal UVP4.
- the power supply voltage UVLO circuit 5, the internal voltage UVLO circuits 6 and 7, and the TSD circuit 9 are all abnormal protection circuits.
- the control logic unit 15 transitions to any one of shutdown state, safe mode state, and standby state.
- the control logic section 15 shifts to the safe mode. Also, at this time, the control logic unit 15 sets both the warning output signal Wo and the reset output signal Rsto to a level indicating an abnormality (for example, Low), and notifies the CMOS sensor device 30 of the abnormality.
- the anomaly protection circuit has the function of detecting an anomaly, it can also be regarded as an anomaly detection circuit.
- the PMIC 1 has a built-in self test (BIST) function for diagnosing whether the abnormality detection circuit and the abnormality protection circuit are operating normally.
- BIST built-in self test
- first to fourth overvoltage detection circuits 19, 21, 24 and 27, first to fourth undervoltage detection circuits 20, 22, 25 and 28, and second to fourth undervoltage protection circuits A self-diagnostic circuit is provided corresponding to each of 23, 26 and 29 ("A-BIST" in FIG. 2).
- the voltage drop detection circuit 20 has a comparator CMP1, an inverter IV1, resistors R1 to R3, and an NMOS transistor NM1. More specifically, one end of the resistor R1 is connected to the FB1 terminal. The other end of resistor R1 is connected to one end of resistor R2 at node N1. The node N1 is connected to one end of a second path changeover switch SW_UVD2 included in the self-diagnostic circuit BST1, which will be described later. The other end of the second path switch SW_UVD2 is connected to the non-inverting input terminal (+) of the comparator CMP1 at the node N3. The inverting input terminal (-) of the comparator CMP1 is connected to the application terminal of the first reference voltage Vref1 generated by the reference voltage generator 4. FIG. The output terminal of the comparator CMP1 is connected to the input terminal of the inverter IV1.
- the NMOS transistor NM1 and resistor R3 are provided for hysteresis function.
- the output terminal of the inverter IV1 is connected to the gate of the NMOS transistor NM1.
- the source of the NMOS transistor NM1 is connected to the ground potential application terminal.
- a drain of the NMOS transistor NM1 is connected to a node N2 to which the other end of the resistor R2 and one end of the resistor R3 are connected.
- the other end of the resistor R3 is connected to the ground potential application end.
- the self-diagnostic circuit BST1 includes a first path switch SW_UVD1, a second path switch SW_UVD2, a first path switch SW_OVD1, a second path switch SW_OVD2, a high side switch SW_BIST_H, a low side switch SW_BIST_L, resistors R7 to R9, and a control logic unit 15 .
- the first path changeover switch SW_UVD1, the second path changeover switch SW_UVD2, the first path changeover switch SW_OVD1, the second path changeover switch SW_OVD2, the high side switch SW_BIST_H, and the low side switch SW_BIST_L are on/off controlled by the control logic unit 15, respectively.
- resistor R7 One end of the resistor R7 is connected to the application end of the second reference voltage Vref2 generated by the reference voltage generator 4.
- the other end of resistor R7 is connected to one end of resistor R8 at node N4.
- the other end of resistor R8 is connected to one end of resistor R9 at node N5.
- the other end of the resistor R9 is connected to the ground potential application end.
- the node N4 is connected to one end of the high side switch SW_BIST_H.
- the other end of the high side switch SW_BIST_H is connected to one end of the first path changeover switch SW_UVD1 at the node N6.
- the other end of the first path changeover switch SW_UVD1 is connected to the node N3.
- the node N5 is connected to one end of the low-side switch SW_BIST_L.
- the other end of the low-side switch SW_BIST_L is connected to node N6 at node N7.
- the overvoltage detection circuit 19 also has a comparator CMP2, an inverter IV2, resistors R4 to R6, and an NMOS transistor NM2.
- the node N7 is connected to one end of the first path switch SW_OVD1.
- the other end of the first path changeover switch SW_OVD1 is connected to a node N8 to which the second path changeover switch SW_OVD2 and the non-inverting input terminal (+) of the comparator CMP2 are connected.
- the first path changeover switch SW_OVD1 is turned off, and the second path changeover switch SW_OVD2 is turned on.
- the voltage generated by dividing the output voltage Vo1 applied to the FB1 terminal by R4 to R6 is applied to the non-inverting input terminal (+) of the comparator CMP2 via the second path switch SW_OVD2 as the comparator input signal CMP2IN.
- the comparator CMP2 compares the comparator input signal CMP2IN with the first reference voltage Vref1.
- the overvoltage detection signal OVD1 which is the output of the comparator CMP2
- the comparator input signal CMP2IN exceeds the first reference voltage Vref1
- the overvoltage detection signal OVD1 output from the comparator CMP2 becomes High.
- the overvoltage detection signal OVD 1 is input to the control logic section 15 . In this manner, when an overvoltage occurs in the output voltage Vo1, the control logic unit 15 can be notified of the high overvoltage detection signal OVD1 indicating an abnormality.
- the control logic unit 15 turns on the first path switch SW_UVD1 and turns off the second path switch SW_UVD2. Further, the control logic unit 15 turns off the first path changeover switch SW_OVD1. In this case, the control logic unit 15 has a first state in which the high side switch SW_BIST_H is turned on and the low side switch SW_BIST_L is turned off, and a second state in which the high side switch SW_BIST_H is turned off and the low side switch SW_BIST_L is turned on. , switch.
- the voltage (first level voltage) generated at the node N4 by dividing the second reference voltage Vref2 by the resistors R7 to R9 is the high-side switch SW_BIST_H and the first path switch SW_UVD1.
- the non-inverting input terminal (+) of the comparator CMP1 as the comparator input signal CMP1IN.
- the comparator CMP1 is operating normally, the output of the comparator CMP1 becomes High and the voltage reduction detection signal UVD1 becomes Low.
- the voltage (second level voltage) generated at the node N5 by dividing the second reference voltage Vref2 by the resistors R7 to R9 passes through the low side switch SW_BIST_L and the first path switch SW_UVD1. is input to the non-inverting input terminal (+) of the comparator CMP1 as the comparator input signal CMP1IN.
- the comparator CMP1 operates normally, the output of the comparator CMP1 becomes Low and the voltage drop detection signal UVD1 becomes High.
- control logic unit 15 can diagnose whether the voltage reduction detection circuit 20 is normal by determining whether the level of the voltage reduction detection signal UVD1 is switched between High and Low.
- control logic unit 15 turns on the first path changeover switch SW_OVD1 and turns off the second path changeover switch SW_OVD2. Further, the control logic unit 15 turns off the first path switch SW_UVD1. In this case, the control logic unit 15 switches between the first state and the second state.
- the voltage generated at the node N4 by dividing the second reference voltage Vref2 by the resistors R7 to R9 passes through the high-side switch SW_BIST_H and the first path switch SW_OVD1 to the non-voltage of the comparator CMP2.
- a comparator input signal CMP2IN is input to the inverting input terminal (+). In this case, if the comparator CMP2 is operating normally, the overvoltage detection signal OVD1, which is the output of the comparator CMP2, becomes High.
- the voltage generated at the node N5 by dividing the second reference voltage Vref2 by the resistors R7 to R9 is applied to the non-inverting input of the comparator CMP2 via the low-side switch SW_BIST_L and the first path switch SW_OVD1.
- a comparator input signal CMP2IN is input to the terminal (+). In this case, if the comparator CMP2 is operating normally, the overvoltage detection signal OVD1, which is the output of the comparator CMP2, becomes Low.
- control logic unit 15 can diagnose whether the overvoltage detection circuit 19 is normal by determining whether the level of the overvoltage detection signal OVD1 is switched between High and Low.
- the voltage switching unit 50 that switches the level of the voltage based on the second reference voltage Vref2 and outputs the voltage is configured from the resistors R7 to R9, the high side switch SW_BIST_H, and the low side switch SW_BIST_L.
- the first path switching switches SW_UVD1 and SW_OVD1 and the second path switching switches SW_UVD2 and SW_OVD2 are the first path for applying the voltage based on the second reference voltage Vref2 to the comparator and the voltage based on the output voltage Vo1 for applying to the comparator.
- Route switching units 51 and 52 for switching between the second route and the second route are configured.
- the first path switching unit 51 includes a first path switching switch SW_UVD1 and a second path switching switch SW_UVD2.
- the second path switching unit 52 includes a first path switching switch SW_OVD1 and a second path switching switch SW_OVD2.
- the first path selector switches SW_UVD1 and SW_OVD1 are turned on, and the second path selector switches SW_UVD2 and SW_OVD2 are turned off, thereby blocking the second path and securing the first path. .
- the control logic unit 15 can diagnose the abnormality detection circuit based on whether the output level of the comparator is switched.
- diagnosis of the abnormality detection circuit can be performed regardless of the value of the output voltage Vo1, which is the voltage to be detected for abnormality. As will be described later, this makes it possible to perform a self-diagnostic operation before the output voltage Vo1 rises when the IC is started.
- switching between the first state and the second state by the high-side switch SW_BIST_H and the low-side switch SW_BIST_L may be started from any state, and the number of times of switching is not limited as long as it is one or more times. .
- the on/off state of the second path changeover switches SW_UVD2 and SW_OVD2 does not matter in one abnormality detection circuit that performs the self-diagnostic operation and the other abnormality detection circuit.
- self-diagnosis circuits can be provided in the same configuration as in FIG. 3 for the second overvoltage detection circuit 21 and the second undervoltage detection circuit 22 .
- the second undervoltage protection circuit 23 and its self-diagnostic circuit the same configurations as the first undervoltage detection circuit 20, the first path changeover switch SW_UVD1, and the second path changeover switch SW_UVD2 shown in FIG. It may be added to the overvoltage detection circuit 21 and the second undervoltage detection circuit 22 .
- the third overvoltage detection circuit 24 the third undervoltage detection circuit 25, the third undervoltage protection circuit 26, and their self-diagnosis circuits
- the fourth overvoltage detection circuit 27, the fourth undervoltage detection circuit 28, and the fourth Undervoltage protection circuit 29 and their self-diagnosis circuits may be configured in the same manner as second overvoltage detection circuit 21, second undervoltage detection circuit 22, and second undervoltage protection circuit 23 and their self-diagnosis circuits. Just do it.
- the voltages to be detected for abnormality are the output voltages Vo1 to Vo4 of the power supply circuit.
- a self-diagnostic circuit may be constructed. That is, it is possible to apply a self-diagnostic circuit in a UVLO circuit or an overheat detection/protection circuit.
- FIG. 4 is a timing chart showing an operation example when the PMIC 1 is activated.
- the control logic unit 15 is in a standby state, and the IC stops operating.
- the internal voltages Vreg50 and Vreg15 also start to rise.
- control logic unit 15 In the digital self-diagnostic mode state, when it is diagnosed that it is normal, the control logic unit 15 shifts to the OTP load state. Here, the control logic unit 15 reads data from the OTP 8 and initializes settings.
- the control logic unit 15 shifts to the analog self-diagnostic mode state (A-BIST).
- A-BIST analog self-diagnostic mode state
- self-diagnostic operations of various overvoltage detection circuits, undervoltage detection circuits, and undervoltage protection circuits are performed.
- the self-diagnostic operation of the UVLO circuit and overheating abnormality detection/protection circuit may be performed.
- the analog self-diagnostic mode state if all circuits are diagnosed as normal, and under the conditions that the UVLO of the power supply voltage Vin is canceled and the UVLO of the internal voltage Vreg50 is canceled, control is performed.
- the logic unit 15 transitions from the analog self-diagnostic mode state to the startup state.
- the control logic unit 15 controls the first to third DC/DC circuits 11, 12, 13 and the LDO 14 to sequentially raise the output voltages Vo1 to Vo4. More specifically, first, the rise of the output voltage Vo1 is started, the voltage reduction state of the output voltage Vo1 is canceled, and when it is detected that the output voltage Vo1 has risen normally, the rise of the output voltage Vo2 is started. Start. When the voltage reduction state of the output voltage Vo2 is canceled and it is detected that the output voltage Vo2 has risen normally, the rise of the output voltage Vo3 is started. Then, when the voltage reduction state of the output voltage Vo3 is canceled and it is detected that the output voltage Vo3 has risen normally, the rise of the output voltage Vo4 is started.
- the control logic unit 15 raises the warning output signal Wo to High. If no abnormality is detected by the abnormality protection circuit within a predetermined delay time after the warning output signal Wo rises to High, the control logic unit 15 raises the reset output signal Rsto to High, Transition from the startup state to the active state (normal operating state).
- the self-diagnostic operation (A-BIST) can be performed before the output voltages Vo1 to Vo4 rise.
- diagnosis can be performed without outputting abnormal output voltages Vo1 to Vo4.
- the control logic unit 15 shifts to the safe mode.
- FIG. 5 is a timing chart showing an example of the self-diagnosis operation of the first reduced voltage detection circuit 20 (FIG. 3) in analog self-diagnosis mode (A-BIST) or the like.
- A-BIST analog self-diagnosis mode
- FIG. 5 regarding the state of the switch, High indicates an ON state, and Low indicates an OFF state.
- the first path changeover switch SW_UVD1 is turned on, and the second path changeover switch SW_UVD2 is turned off.
- the ON/OFF states of the high side switch SW_BIST_H and the low side switch SW_BIST_L are switched in the order of the first state ⁇ second state ⁇ first state.
- the comparator input signal CMP1IN is switched from High ⁇ Low ⁇ High.
- the control logic unit 15 diagnoses that the voltage reduction detection circuit 20 is normal.
- control logic unit 15 can shift from the active state to the self-diagnostic mode state (SELF TEST). This transition is performed in accordance with a command from the CMOS sensor device 30 through I2C communication. In this self-diagnostic mode state as well, the self-diagnostic operation in the voltage reduction detection circuit 20 is performed in the same manner as in the analog self-diagnostic mode state.
- SELF TEST self-diagnostic mode state
- the self-diagnostic circuit (BST1) includes a first comparator ( A self-diagnostic circuit for diagnosing an abnormality detection circuit (20) having CMP1), a voltage switching unit (50) that switches and outputs a voltage level based on the second reference voltage (Vref2); A first path switching unit (51) that switches between a path through which the voltage output from the voltage switching unit is input to the first comparator and a path through which the voltage based on the abnormality detection target voltage is input to the first comparator.
- a control section (15) for controlling the voltage switching section and the path switching section first configuration.
- the voltage switching unit (50) has a first node (50) having one end connected to a first node (N4) at which a first level voltage based on the second reference voltage (Vref2) is generated.
- a second switch having a switch (SW_BIST_H), one end connected to a second node (N5) generating a second level voltage based on the second reference voltage, and the other end connected to the other end of the first switch. and a switch (SW_BIST_L), and the first switch and the second switch may be on/off controlled by the control unit (15) (second configuration).
- the voltage switching unit (50) A first resistor (R7) having one end connected to the application end of the second reference voltage (Vref2), and a second resistor (R7) having one end connected to the other end of the first resistor and the first node (N4). It has a configuration including a resistor (R8) and a third resistor (R9) having one end connected to the other end of the second resistor and the second node (N5) (third configuration).
- the first path switching section (51) includes a third node (N6) to which the voltage output from the voltage switching section (50) is applied, and the A third switch (SW_UVD1) arranged between the input terminal of the first comparator (CMP1), a fourth node (N1) to which a voltage based on the abnormality detection target voltage (Vo1) is applied, and the first comparator and a fourth switch (SW_UVD2) disposed between the input end of the (fourth configuration).
- the abnormality detection circuit (20) includes a fourth resistor (R1) having one end connected to the application terminal of the abnormality detection target voltage (Vo1), and a resistor other than the fourth resistor.
- a fifth resistor (R2) having one end connected to the fourth node (N1) and a sixth resistor (R3) having one end connected to the other end of the fifth resistor at the fifth node (N2).
- an NMOS transistor (NM1) including a gate driven based on the output of the first comparator and a drain connected to the fifth node (fifth configuration).
- the first reference voltage (Vref1) is applied to one input terminal of the first comparator (CMP1)
- the abnormality detection circuit (20, 19) has a second comparator (CMP2) having one input terminal to which the first reference voltage is applied
- the self-diagnostic circuit (BST1) detects the voltage output from the voltage switching section (50) as the A second path switching unit that switches between a path through which the other input terminal of the second comparator is inputted and a path through which the voltage based on the abnormality detection target voltage (Vo1) is inputted to the other input terminal of the second comparator.
- (52) may be used (sixth configuration).
- the abnormality detection target voltage (Vo1) may be the output voltage of the power supply circuit (41) (seventh configuration).
- the self-diagnostic operation may be performed before the output voltage (Vo1) rises when starting the IC (1) including the self-diagnostic circuit (BST1) (eighth configuration). .
- the semiconductor device (1) has a configuration including the self-diagnostic circuit (BST1) having any one of the first to eighth configurations (ninth configuration).
- a power supply circuit (14) for supplying power to the in-vehicle device (30) may be provided, and the abnormality detection target voltage (Vo4) may be the output voltage of the power supply circuit.
- the present disclosure can be used, for example, for in-vehicle PMICs.
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Abstract
Description
第2基準電圧に基づく電圧のレベルを切り替えて出力する電圧切替え部と、
前記電圧切替え部から出力される電圧が前記第1コンパレータに入力される経路と、前記異常検出対象電圧に基づく電圧が前記第1コンパレータに入力される経路とを切り替える第1経路切替え部と、
前記電圧切替え部および前記経路切替え部を制御する制御部と、
を有する、自己診断回路としている。
まず、本開示の実施形態について説明する前に、本開示の実施形態と比較するための比較例について説明する。比較例について説明することで、本開示の意義が明らかとなる。
ここでは、本開示の例示的な実施形態に係るPMIC(Power Management IC)の構成について説明する。図1は、本開示の例示的な実施形態に係るPMIC1の外部接続に関する構成を示す図である。図2は、PMIC1の内部構成を示す図である。
第1過電圧検出回路19、第2過電圧検出回路21、第3過電圧検出回路24、および第4過電圧検出回路27は、過電圧異常を検出する異常検出回路である。
第2減電圧保護回路23、第3減電圧保護回路26、および第4減電圧保護回路29は、減電圧異常を検出する異常保護回路である。
本実施形態に係るPMIC1は、異常検出回路および異常保護回路が正常に動作しているかを診断する自己診断(BIST:Built-In Self Test)機能を有している。以下、自己診断機能について説明する。
ここでは、図3を用いて、減電圧検出回路20および過電圧検出回路19それぞれを診断する自己診断回路BST1の構成について説明する。
次に、このような図3に示す構成における動作について説明する。通常動作時などにおいて、第1経路切替スイッチSW_UVD1はオフ状態、第2経路切替スイッチSW_UVD2はオン状態とされる。この場合、ハイサイドSW_BIST_HとローサイドスイッチSW_BIST_Lは、ともにオフ状態とされる。これにより、FB1端子に印加される出力電圧Vo1をR1~R3により分圧されて生成される電圧が第2経路切替スイッチSW_UVD2を介してコンパレータCMP1の非反転入力端(+)にコンパレータ入力信号CMP1INとして入力される。コンパレータCMP1は、コンパレータ入力信号CMP1INと第1基準電圧Vref1とを比較する。
なお、減電圧検出回路20用の自己診断動作と、過電圧検出回路19用の自己診断動作は、時系列的に順に実施するが、実施する順番は問わない。
ここで、図4は、PMIC1の起動時における動作例を示すタイミングチャートである。図4において、まず制御ロジック部15は、スタンバイ状態であり、ICは動作を停止している。この状態でタイミングt1において、電源電圧Vinの立ち上がりが開始されると、それに伴い、内部電圧Vreg50およびVreg15の立ち上がりも開始される。
図5は、アナログ自己診断モード状態(A-BIST)等における第1減電圧検出回路20(図3)の自己診断動作の一例を示すタイミングチャートである。なお、図5において、スイッチの状態は、Highがオン状態、Lowがオフ状態を示す。
なお、本明細書中に開示されている種々の技術的特徴は、上記実施形態のほか、その技術的創作の主旨を逸脱しない範囲で種々の変更を加えることが可能である。すなわち、上記実施形態は、全ての点で例示であって制限的なものではないと考えられるべきであり、の技術的範囲は、上記実施形態に限定されるものではなく、特許請求の範囲と均等の意味および範囲内に属する全ての変更が含まれると理解されるべきである。
以上のように、例えば、本開示の一態様に係る自己診断回路(BST1)は、異常検出対象電圧(Vo1)に基づく電圧と、第1基準電圧(Vref1)とを入力可能な第1コンパレータ(CMP1)を有する異常検出回路(20)を診断する自己診断回路であって、
第2基準電圧(Vref2)に基づく電圧のレベルを切り替えて出力する電圧切替え部(50)と、
前記電圧切替え部から出力される電圧が前記第1コンパレータに入力される経路と、前記異常検出対象電圧に基づく電圧が前記第1コンパレータに入力される経路とを切り替える第1経路切替え部(51)と、
前記電圧切替え部および前記経路切替え部を制御する制御部(15)と、を有する構成としている(第1の構成)。
前記第2基準電圧(Vref2)の印加端に接続される一端を有する第1抵抗(R7)と、前記第1抵抗の他端と前記第1ノード(N4)において接続される一端を有する第2抵抗(R8)と、前記第2抵抗の他端と前記第2ノード(N5)において接続される一端を有する第3抵抗(R9)と、を有する構成としている(第3の構成)。
2,3 内部電圧生成部
4 基準電圧生成部
5 電源電圧UVLO回路
6,7 内部電圧UVLO回路
8 OTP
9 TSD回路
10 TW回路
11,12,13 DC/DC回路
14 LDO
15 制御ロジック部
16 I2C入出力部
17 リセット入出力部
18 ワーニング入出力部
19 第1過電圧検出回路
20 第1減電圧検出回路
21 第2過電圧検出回路
22 第2減電圧検出回路
23 第2減電圧保護回路
24 第3過電圧検出回路
25 第3減電圧検出回路
26 第3減電圧保護回路
27 第4過電圧検出回路
28 第4減電圧検出回路
29 第4減電圧保護回路
30 CMOSセンサ装置
41 第1DC/DCコンバータ
42 第2DC/DCコンバータ
43 第3DC/DCコンバータ
BST1 自己診断回路
CMP1,CMP2 コンパレータ
Cb1 ブートコンデンサ
Co1~Co3 出力コンデンサ
IV1,IV2 インバータ
L1~L3 インダクタ
NM1,NM2 NMOSトランジスタ
R1~R9 抵抗
SW_BIST_H ハイサイドスイッチ
SW_BIST_L ローサイドスイッチ
SW_UVD1 第1経路切替スイッチ
SW_UVD2 第2経路切替スイッチ
SW_OVD1 第1経路切替スイッチ
SW_OVD2 第2経路切替スイッチ
Claims (10)
- 異常検出対象電圧に基づく電圧と、第1基準電圧とを入力可能な第1コンパレータを有する異常検出回路を診断する自己診断回路であって、
第2基準電圧に基づく電圧のレベルを切り替えて出力する電圧切替え部と、
前記電圧切替え部から出力される電圧が前記第1コンパレータに入力される経路と、前記異常検出対象電圧に基づく電圧が前記第1コンパレータに入力される経路とを切り替える第1経路切替え部と、
前記電圧切替え部および前記経路切替え部を制御する制御部と、
を有する、自己診断回路。 - 前記電圧切替え部は、
前記第2基準電圧に基づく第1レベルの電圧が生じる第1ノードに接続される一端を有する第1スイッチと、
前記第2基準電圧に基づく第2レベルの電圧が生じる第2ノードに接続される一端と、前記第1スイッチの他端と接続される他端を有する第2スイッチと、
を有し、
前記第1スイッチおよび前記第2スイッチは、前記制御部によりオンオフ制御される、請求項1に記載の自己診断回路。 - 前記電圧切替え部は、
前記第2基準電圧の印加端に接続される一端を有する第1抵抗と、
前記第1抵抗の他端と前記第1ノードにおいて接続される一端を有する第2抵抗と、
前記第2抵抗の他端と前記第2ノードにおいて接続される一端を有する第3抵抗と、
を有する、請求項2に記載の自己診断回路。 - 前記第1経路切替え部は、
前記電圧切替え部から出力される電圧が印加される第3ノードと前記第1コンパレータの入力端との間に配置される第3スイッチと、
前記異常検出対象電圧に基づく電圧が印加される第4ノードと前記第1コンパレータの前記入力端との間に配置される第4スイッチと、
を有する、請求項1から請求項3のいずれか1項に記載の自己診断回路。 - 前記異常検出回路は、
前記異常検出対象電圧の印加端に接続される一端を有する第4抵抗と、
前記第4抵抗の他端と前記第4ノードにおいて接続される一端を有する第5抵抗と、
前記第5抵抗の他端と第5ノードにおいて接続される一端を有する第6抵抗と、
前記第1コンパレータの出力に基づき駆動されるゲートと、前記第5ノードに接続されるドレインとを含むNMOSトランジスタと、
を有する、請求項4に記載の自己診断回路。 - 前記第1基準電圧は、前記第1コンパレータの一方の入力端に印加され、
前記異常検出回路は、前記第1基準電圧が印加される一方の入力端を有する第2コンパレータを有し、
当該自己診断回路は、前記電圧切替え部から出力される電圧が前記第2コンパレータの他方の入力端に入力される経路と、前記異常検出対象電圧に基づく電圧が前記第2コンパレータの前記他方の入力端に入力される経路とを切り替える第2経路切替え部を有する、請求項1から請求項5のいずれか1項に記載の自己診断回路。 - 前記異常検出対象電圧は、電源回路の出力電圧である、請求項1から請求項6のいずれか1項に記載の自己診断回路。
- 当該自己診断回路を含むICの起動において前記出力電圧が立ち上がる前に自己診断動作を行う、請求項7に記載の自己診断回路。
- 請求項1から請求項8のいずれか1項に記載の自己診断回路を有する、半導体装置。
- 車載用装置に電源を供給する電源回路を有し、
前記異常検出対象電圧は、前記電源回路の出力電圧である、請求項9に記載の半導体装置。
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2022
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- 2022-01-12 DE DE112022000290.5T patent/DE112022000290T5/de active Pending
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CN116783497A (zh) | 2023-09-19 |
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