JP2017146822A - Electronic controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic controller which can monitor a supply voltage supplied to a CPU core while securing the reliability of operation in a configuration where the supply voltage supplied to the CPU core is generated outside a microcomputer.SOLUTION: The electronic controller comprises: a first power supply circuit which supplies a first voltage; a second power supply circuit which supplies a second voltage; a core voltage generation circuit which uses the first voltage supplied from the first power supply circuit to generate a third voltage; a microcomputer which has a first circuit operated by the first voltage supplied from the first power supply circuit and a CPU core operated by the third voltage generated by the core voltage generation circuit and electronically controls a vehicle; and a voltage monitoring circuit which is operated by the second voltage supplied from the second power supply circuit and monitors the voltage value of the third voltage generated by the core voltage generation circuit.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electronic control device that performs electronic control of a vehicle.

  In recent vehicles, electronic control devices such as an engine control unit and an automatic transmission control unit are mounted, and the vehicle is electronically controlled by a microcomputer included in the electronic control device.

  The microcomputer of this electronic control device is composed of a plurality of types of circuits such as a CPU core (hereinafter also simply referred to as “core”) that is an arithmetic unit, a peripheral circuit such as a memory and a circuit that performs input / output with the outside, Each of the plurality of types of circuits operates with a power supply voltage supplied to the microcomputer from the outside.

  Japanese Patent Application Laid-Open No. 2005-208939 includes power monitoring means for monitoring whether or not the power supply voltage supplied to the microcomputer is in an appropriate power supply voltage range, and when the power supply voltage is not in the proper power supply voltage range, A microcomputer power supply voltage monitoring system for stopping control of an external load by a microcomputer is disclosed.

JP 2005-208939 A

  Recently, with the increasing complexity of electronic control of vehicles, there has been an increasing demand for higher functionality in microcomputers used in electronic control devices. However, since higher functionality of the microcomputer is accompanied by an increase in power consumption and heat generation, a configuration that suppresses these is desired. For example, the power supply voltage supplied to the core of the conventional microcomputer has been configured to be generated inside the microcomputer based on the power supply voltage supplied from outside, but the power supply voltage supplied to the core of the microcomputer is generated outside the microcomputer. Thus, a configuration that suppresses an increase in power consumption and heat generation of the microcomputer itself can be considered.

  On the other hand, it is desirable to monitor whether the power supply voltage supplied from the outside of the microcomputer is within an appropriate range as in the microcomputer power supply voltage monitoring system disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2005-208939. However, this microcomputer power supply voltage monitoring system monitors the power supply voltage supplied to the microcomputer itself, and does not disclose any power supply voltage supplied to the core. The power supply monitoring means operates with a power supply voltage that is a monitoring target of the power supply monitoring means, and there is a problem that operation reliability may be lacking.

  An object of the present invention is to provide an electronic control device capable of monitoring the power supply voltage supplied to the CPU core while ensuring the reliability of the operation in a configuration in which the power supply voltage supplied to the CPU core is generated outside the microcomputer. Is to provide.

  In order to achieve the above object, according to the present invention, in an electronic control device, a first power supply circuit that supplies a first voltage, a second power supply circuit that supplies a second voltage, and the first power supply A core voltage generation circuit that generates a third voltage using the first voltage supplied from the circuit; a first circuit that operates by the first voltage supplied by the first power supply circuit; and A CPU core that operates by the third voltage generated by the core voltage generation circuit, a microcomputer that performs electronic control of the vehicle, and operates by the second voltage supplied by the second power supply circuit, A voltage monitoring circuit that monitors a voltage value of the third voltage generated by the core voltage generation circuit.

  According to the present invention, in the configuration in which the power supply voltage supplied to the CPU core is generated outside the microcomputer, the power supply voltage supplied to the CPU core can be monitored while ensuring operation reliability. Can be provided.

  Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

1 is a block diagram showing a schematic configuration of an electronic control device according to an embodiment of the present invention. 1 is a block diagram showing a schematic configuration of an electronic control device according to Embodiment 1 of the present invention. 3 is a flowchart showing processing of the electronic control device according to the first embodiment of the present invention. The block diagram which shows schematic structure of the electronic controller which concerns on Example 2 of this invention. 9 is a flowchart showing processing of an electronic control device according to Embodiment 3 of the present invention.

  Hereinafter, an electronic control device according to an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic configuration of an electronic control device according to an embodiment of the present invention.

  The electronic control device 1 of the present embodiment is a device that is mounted on an automobile and used for electronic control of an engine, transmission, brake, or the like, and includes a microcomputer 2 that performs this electronic control. The microcomputer 2 includes a core 10 that is a CPU core that operates as an arithmetic unit of the microcomputer 2, and includes peripheral circuits such as a memory such as a RAM and a ROM, and a circuit that performs input and output with the outside. The electronic control device 1 also includes a first power supply circuit 4, a second power supply circuit 3, a core voltage generation circuit 5, and a voltage monitoring circuit 6, which will be described in detail later.

  Each circuit included in the microcomputer 2 includes, for example, a first circuit 8 that operates by using a first voltage v1 (for example, 3V) supplied from a first power circuit 4 that is a regulator, and a first circuit that is a regulator, for example. The second circuit 7 operates with the second voltage v2 (for example, 5 V) supplied from the second power supply circuit 3 as a power supply. The core 10 of the microcomputer 2 operates using the third voltage v3 (for example, 1.25 V) generated by the core voltage generation circuit 5 provided outside the microcomputer 2 as a power source.

  The core voltage generation circuit 5 generates the third voltage v3 using the first voltage v1 supplied from the first power supply circuit 4. The voltage value of the third voltage v3 generated by the core voltage generation circuit 5 is controlled and adjusted by the voltage control circuit 9 of the microcomputer 2. In the present embodiment, the voltage control circuit 9 operates using the first voltage v 1 supplied from the first power supply circuit 4 as a power supply, but the voltage control circuit 9 is supplied from the second power supply circuit 3. The second voltage v2 to be operated may be used as a power source.

  The voltage monitoring circuit 6 is provided outside the microcomputer 2 and is configured by an IC having a calculation unit such as a CPU core (not shown), for example. The voltage monitoring circuit 6 is supplied from a second power supply circuit 3 that is different from the first power supply circuit 4 that is the supply source of the first voltage v1 that is the generation source of the third voltage v3 in the core voltage generation circuit 5. The circuit operates using the second voltage v2 as a power source.

  The voltage monitoring circuit 6 performs two-way communication with the core 10 of the microcomputer 2. For example, the voltage monitoring circuit 6 transmits a calculation problem from one to the other and transmits an answer to the calculation problem from the other to the other. The correctness of the answers can confirm that each other is operating correctly.

  The voltage monitoring circuit 6 monitors the voltage value of the third voltage v <b> 3 generated by the core voltage generation circuit 5. For example, the voltage monitoring circuit 6 does not output the output signal s1 when the voltage value of the third voltage v3 is within an appropriate range (for example, a range of 1.15 V to 1.35 V), but the third voltage v3 When the voltage value of v3 is not within an appropriate range (for example, a range of 1.15V to 1.35V), an output signal s1 is output. In addition, when the voltage value of the third voltage v3 is lower than the lower limit (for example, 1.15 V) of the appropriate range, the core 10 cannot be operated or the calculation result by the core 10 may be incorrect. Can be considered. In addition, when the voltage value of the third voltage v3 is higher than the upper limit (for example, 1.35V) of the appropriate range, the calculation result by the core 10 is not correct, or the core 10 generates a lot of heat, and the circuit is destroyed. There is a possibility of fear.

  In the present embodiment, the output signal s1 output from the voltage monitoring circuit 6 is input to the reset terminal of the microcomputer 2, and the microcomputer 2 is reset when the voltage value of the third voltage v3 is not within the appropriate range. The output signal s1 output from the voltage monitoring circuit 6 is also output to the outside of the electronic control device 1. When the output signal s1 output from the electronic control device 1 is input to another control device (not shown) provided outside the electronic control device 1, the abnormality of the electronic control device 1 is detected in the other control device. Can also be detected.

  According to the present embodiment, by configuring as described above, the power supply voltage (third voltage v3) supplied to the core 10 is generated outside the microcomputer 2 (the first power supplied from the first power supply circuit 4). The voltage monitoring circuit 6 monitors the power supply voltage (third voltage v3) supplied to the core 10 in a configuration in which the core voltage generation circuit 5 generates the voltage v1 based on one voltage v1. Since the circuit 6 is a circuit that operates using the second voltage v2 supplied from the second power supply circuit 3 different from the first power supply circuit 4 as a power supply, the first power supply circuit 4 and the core voltage generation circuit The power supply voltage (third voltage v3) supplied to the core 10 can be monitored while ensuring the operation reliability without being affected by the abnormality 5.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 2 is a block diagram illustrating a schematic configuration of the electronic control device according to the first embodiment of the present invention.

  This embodiment shows an example in which the microcomputer 120 is a two-power supply microcomputer (a microcomputer that operates by receiving supply of two kinds of power supply voltages).

  The electronic control device 110 according to the present embodiment is a device that is mounted on an automobile and used for electronic control of an engine, a transmission, a brake, or the like, and includes a microcomputer 120 that performs this electronic control. The microcomputer 120 includes a core 124 that is a CPU core that operates as a calculation unit of the microcomputer 120, a memory such as a RAM and a ROM, and peripheral circuits such as a circuit that performs input and output with the outside. The electronic control unit 110 also includes a power supply IC 131 having a regulator 133 as a first power supply circuit and a regulator 132 as a second power supply circuit, a switching circuit 150 as a core voltage generation circuit, and voltage monitoring, which will be described in detail later. A monitoring IC 160 having a monitoring unit 161 as a circuit is provided. The power supply IC 131 receives supply of power supply voltage from the external battery 130, and generates and outputs power supply voltages (second voltage v2 and first voltage v1) to be supplied to the microcomputer 120 by the regulator 132 and the regulator 133, respectively. To do.

  Each circuit included in the microcomputer 120 includes a circuit 122 as a first circuit that operates using a first voltage v1 (for example, 3V) supplied from the regulator 133 as a power source, and a second voltage supplied from the regulator 132. and a circuit 121 as a second circuit that operates using v2 (for example, 5 V) as a power source. The core 124 of the microcomputer 120 operates using a third voltage v3 (for example, 1.25 V) generated by the switching circuit 150 provided outside the microcomputer 120 as a power source.

  The switching circuit 150 is PWM controlled by being turned on / off by a signal from the voltage control unit 123, and generates a third voltage v3 by stepping down the first voltage v1 supplied from the regulator 133. In the present embodiment, the voltage control unit 123 is included in the circuit 122 and operates using the first voltage v 1 supplied from the regulator 133 as a power source. However, the voltage control unit 123 is supplied from the regulator 132. It may operate with the second voltage v2 as a power source.

  The monitoring IC 160 is provided outside the microcomputer 120 and has a monitoring unit 161. The monitoring unit 161 is configured by a calculation unit (not shown) such as a CPU core in the monitoring IC 160, for example. The monitoring unit 161 operates using the second voltage v2 supplied from the regulator 132, which is different from the regulator 133 that is the supply source of the first voltage v1 that is the generation source of the third voltage v3 in the switching circuit 150. .

  A calculation unit (not shown) of the monitoring IC 160 including the monitoring unit 161 performs bidirectional communication with the core 124 of the microcomputer 120. For example, the calculation unit transmits a calculation problem from one to the other and from the other to the other. By sending the answer to the calculation problem, it is possible to confirm that each other is operating correctly by checking whether the answer is correct.

  The monitoring unit 161 monitors the voltage value of the third voltage v <b> 3 generated by the switching circuit 150. For example, the monitoring unit 161 does not output the output signal s1 when the voltage value of the third voltage v3 is within an appropriate range (for example, a range of 1.15V to 1.35V), but the third voltage v3. Is not within an appropriate range (for example, a range of 1.15V to 1.35V), an output signal s1 is output.

  In this embodiment, the output signal s1 output from the monitoring unit 161 is input to the reset terminal of the microcomputer 120. If the voltage value of the third voltage v3 is not within the appropriate range, the microcomputer 120 is reset by the output signal s1. Is done. The output signal s1 output from the monitoring unit 161 is also output outside the electronic control device 110. When the output signal s1 output from the electronic control device 110 is input to another control device (not shown) provided outside the electronic control device 110, the abnormality of the electronic control device 110 is detected in the other control device. Can also be detected.

  FIG. 3 is a flowchart illustrating processing of the electronic control device according to the first embodiment of the present invention.

  In the microcomputer 120, the voltage control unit 123 performs PWM control (instruction of the core voltage value) of the switching circuit 150 (step 1101), and the switching circuit 150 generates the third voltage v 3 to be supplied to the core 124.

  The monitoring unit 161 of the monitoring IC 160 measures the voltage value of the third voltage v3 generated by the switching circuit 150 (the voltage value supplied to the core 124) (step 1102), and the voltage value of the third voltage v3 is It is determined whether or not it is within an appropriate range (for example, a range of 1.15V to 1.35V) (step 1103).

  In step 1103, when the voltage value of the third voltage v3 is within the appropriate range (step 1103: Yes), the processing is ended as it is.

  In step 1103, if the voltage value of the third voltage v3 is not within the appropriate range (step 1103: No), the process is terminated after executing step 1104. In step 1104, the monitoring unit 161 outputs the output signal s1, and the microcomputer 120 is reset by inputting the output signal s1 to the reset terminal.

  According to this embodiment, the power supply voltage (third voltage v3) supplied to the core 124 is generated outside the microcomputer 120 (the first voltage v1 supplied from the regulator 133) by configuring as described above. In this configuration, the monitoring unit 161 monitors the power supply voltage (third voltage v3) supplied to the core 124. The monitoring unit 161 is the same as the regulator 133. Since the circuit operates using the second voltage v2 supplied from another regulator 132 as a power supply, it is supplied to the core 124 while ensuring reliability of operation without being affected by the abnormality of the regulator 133 and the switching circuit 150. The power supply voltage (third voltage v3) can be monitored.

  FIG. 4 is a block diagram illustrating a schematic configuration of the electronic control device according to the second embodiment of the present invention.

  This embodiment shows an example in which the microcomputer 220 is a one-power supply microcomputer (a microcomputer that operates by receiving supply of one kind of power supply voltage).

  The electronic control device 210 according to the present embodiment is a device that is mounted on an automobile and used for electronic control of an engine, a transmission, a brake, or the like, and includes a microcomputer 220 that performs the electronic control. The microcomputer 220 includes a core 224 that is a CPU core that operates as a calculation unit of the microcomputer 220, and includes peripheral circuits such as a memory such as a RAM and a ROM, and a circuit that performs input and output with the outside. The electronic control unit 210 also includes a power supply IC 231 having a regulator 233 as a first power supply circuit, a regulator 232 as a second power supply circuit, a switching circuit 250 as a core voltage generation circuit, and a voltage monitor, which will be described in detail later. A monitoring IC 260 having a monitoring unit 261 as a circuit is provided. The power supply IC 231 receives supply of power supply voltage from the external battery 230, and generates and outputs a power supply voltage (first voltage v <b> 1) supplied to the microcomputer 220 by the regulator 233. The regulator 232 generates and outputs a power supply voltage (second voltage v2) to be supplied to the monitoring IC 260. The supply of the power supply voltage to the regulator 232 may be received from the external battery 230 in the same manner as the regulator 233, or another configuration may be used.

  Each circuit included in the microcomputer 220 is a first circuit, and operates using a first voltage v1 (for example, 3 V) supplied from the regulator 233 as a power source. The core 224 of the microcomputer 220 operates using a third voltage v3 (for example, 1.25 V) generated by the switching circuit 250 provided outside the microcomputer 220 as a power source.

  The switching circuit 250 is PWM-controlled by turning on and off with a signal from the voltage control unit 223, and steps down the first voltage v1 supplied from the regulator 233 to generate a third voltage v3. In this embodiment, the voltage control unit 223 operates using the first voltage v1 supplied from the regulator 233 as a power source, but the voltage control unit 223 operates using another voltage (not shown) as a power source. It may be.

  The monitoring IC 260 is provided outside the microcomputer 220 and has a monitoring unit 261. The monitoring unit 261 is configured by a calculation unit (not shown) such as a CPU core in the monitoring IC 260, for example. The monitoring unit 261 operates using the second voltage v2 supplied from the regulator 232, which is different from the regulator 233 that supplies the first voltage v1, which is the generation source of the third voltage v3, in the switching circuit 250. .

  A calculation unit (not shown) of the monitoring IC 260 including the monitoring unit 261 performs bidirectional communication with the core 224 of the microcomputer 220. For example, the calculation problem is transmitted from one to the other and from the other to the other. By sending the answer to the calculation problem, it is possible to confirm that each other is operating correctly by checking whether the answer is correct.

  The monitoring unit 261 monitors the voltage value of the third voltage v <b> 3 generated by the switching circuit 250. For example, the monitoring unit 261 does not output the output signal s1 when the voltage value of the third voltage v3 is within an appropriate range (for example, a range of 1.15V to 1.35V), but the third voltage v3. Is not within an appropriate range (for example, a range of 1.15V to 1.35V), an output signal s1 is output.

  In this embodiment, the output signal s1 output from the monitoring unit 261 is input to the reset terminal of the microcomputer 220. If the voltage value of the third voltage v3 is not within the appropriate range, the microcomputer 220 is reset by the output signal s1. Is done. The output signal s1 output from the monitoring unit 261 is also output outside the electronic control device 210. When the output signal s1 output from the electronic control device 210 is input to another control device (not shown) provided outside the electronic control device 210, an abnormality of the electronic control device 210 is detected in the other control device. Can also be detected.

  According to the present embodiment, the power supply voltage (third voltage v3) supplied to the core 224 is generated outside the microcomputer 220 (the first voltage v1 supplied from the regulator 233) by configuring as described above. In this configuration, the monitoring unit 261 monitors the power supply voltage (third voltage v3) supplied to the core 224. The monitoring unit 261 is the regulator 233. Since this circuit operates using the second voltage v2 supplied from another regulator 232 as a power source, it is supplied to the core 224 while ensuring reliability of operation without being affected by the abnormality of the regulator 233 and the switching circuit 250. The power supply voltage (third voltage v3) can be monitored.

  FIG. 5 is a flowchart illustrating processing of the electronic control device according to the third embodiment of the present invention.

  Since the block diagram of the present embodiment is the same as the block diagram of the first embodiment shown in FIG. 2, the processing of the present embodiment will be described with reference to FIGS.

  In the microcomputer 120 of this embodiment, the voltage control unit 123 performs PWM control (instruction of the core voltage value) of the switching circuit 150 (step 1201), and the switching circuit 150 generates the third voltage v3 to be supplied to the core 124. .

  The monitoring unit 161 of the monitoring IC 160 measures the voltage value of the third voltage v3 generated by the switching circuit 150 (the voltage value supplied to the core 124) (step 1202), and the voltage value of the third voltage v3 is determined. It is determined whether it is within an appropriate range (for example, a range of 1.15V to 1.35V) (step 1203).

  In step 1203, when the voltage value of the third voltage v3 is within the appropriate range (step 1203: Yes), the process is ended as it is.

  In step 1203, when the voltage value of the third voltage v3 is not within the appropriate range (step 1103: No), the voltage control unit 123 again performs PWM control of the switching circuit 150 (the voltage value measured in step 1202 is appropriate). If the voltage value is lower than the range, control is performed to increase the voltage value, and if the voltage value measured in step 1202 is higher than the appropriate range, control is performed to decrease the voltage value) (step 1204). A third voltage v3 to be supplied to is generated.

  The monitoring unit 161 of the monitoring IC 160 measures the voltage value of the third voltage v3 generated by the switching circuit 150 (the voltage value supplied to the core 124) (step 1205), and the voltage value of the third voltage v3 is determined. It is determined whether or not it is within an appropriate range (for example, a range of 1.15V to 1.35V) (step 1206).

  In step 1206, when the voltage value of the third voltage v3 is within the appropriate range (step 1206: Yes), the processing is ended as it is.

  In step 1206, when the voltage value of the third voltage v3 is not within the appropriate range (step 1206: No), the processing is terminated after executing step 1207. In step 1207, the monitoring unit 161 outputs the output signal s1, and the microcomputer 120 is reset by inputting the output signal s1 to the reset terminal.

  As described above, in this embodiment, in step 1204, feedback control is performed during PWM control of the switching circuit 150 by the voltage control unit 123 based on the core voltage value measured in step 1202. Since the monitoring IC 160 and the microcomputer 120 perform bidirectional communication as described above, the measurement result of the core voltage value by the monitoring unit 161 in step 1202 is transmitted to the microcomputer 120. In the microcomputer 120 that has received the measurement result, in step 1204 The voltage control unit 123 can be operated by feedback control based on the measurement result of the core voltage value. Note that the feedback control in step 1204 is performed only once, and if the core voltage value does not fall within the appropriate range, the output signal s1 may be output to reset the microcomputer 120, or multiple feedback control may be performed. You may go. Further, the feedback control in step 1204 is performed a plurality of times within a predetermined fixed time, and if the core voltage value does not fall within the proper range even after the fixed time has elapsed, an output signal s1 is output to output the microcomputer 120. May be reset.

  In each of the above-described embodiments, the example in which the present invention is applied to the configuration in which the microcomputer has one core has been described. However, the present invention is not limited to this, and the microcomputer has a plurality of cores. The power supply voltage may be monitored for all of the plurality of cores, or the power supply voltage may be monitored for any of the plurality of cores. Good. Each of the plurality of cores may operate with the same power supply voltage, or may operate with different power supply voltages.

<Appendix 1>
The embodiment described above is
1.
A first power supply circuit for supplying a first voltage;
A second power supply circuit for supplying a second voltage;
A core voltage generation circuit for generating a third voltage using the first voltage supplied from the first power supply circuit;
A first circuit that operates with the first voltage supplied by the first power supply circuit; and a CPU core that operates with the third voltage generated by the core voltage generation circuit. Microcomputer to do,
A voltage monitoring circuit that operates with the second voltage supplied by the second power supply circuit and that monitors the voltage value of the third voltage generated by the core voltage generation circuit;
Comprising
Because it is an electronic control device characterized by
To provide an electronic control device capable of monitoring the power supply voltage supplied to the CPU core while ensuring the reliability of the operation in a configuration in which the power supply voltage supplied to the CPU core is generated outside the microcomputer. it can.
・ Even if the microcomputer is a single-power supply microcomputer (a microcomputer that operates by receiving one type of power supply voltage), the microcomputer is a two-power supply microcomputer (a microcomputer that operates by receiving two types of power supply voltages) Even so, it is possible to provide an electronic control device capable of monitoring the power supply voltage supplied to the CPU core while ensuring the reliability of the operation.

In the present embodiment,
2.
1. In the electronic control device described in
The microcomputer further includes a second circuit that operates by the second voltage supplied by the second power supply circuit,
Because it is an electronic control device characterized by
-Even if the microcomputer is a two-power supply microcomputer (a microcomputer that operates by receiving two types of power supply voltages), it is possible to monitor the power supply voltage supplied to the core while ensuring operational reliability. An electronic control device that can be provided can be provided.
Of the two types of power supply voltages supplied to the two-power supply microcomputer (the microcomputer that operates upon receiving two types of power supply voltages), the power supply voltage supplied to the core voltage generation unit (for example, the voltage by the regulator 133) Since the voltage monitoring unit is driven by another power supply voltage (for example, voltage by the regulator 132), it is not necessary to provide a new power supply in addition to the power supply provided for operating the microcomputer, and the cost is increased. May be suppressed.

In the present embodiment,
3.
1. In the electronic control device described in
The voltage monitoring circuit resets the microcomputer when the voltage value of the second voltage is not within an appropriate range.
Because it is an electronic control device characterized by
-When the core voltage value is not within the proper range, the core malfunction may be prevented.

In the present embodiment,
4).
1. In the electronic control device described in
The microcomputer further includes a voltage control circuit that controls a voltage value of the third voltage generated by the core voltage generation circuit,
The core voltage generation circuit can change the voltage value of the third voltage by control from the voltage control circuit.
Because it is an electronic control device characterized by
-For example, the core voltage value may be arbitrarily changed by the voltage control circuit in accordance with the core specifications.

In the present embodiment,
5).
4). In the electronic control device described in
The voltage monitoring circuit notifies the voltage control circuit of a monitoring result of the voltage value of the third voltage;
The voltage control circuit controls the core voltage generation circuit based on the monitoring result from the voltage monitoring circuit.
Because it is an electronic control device characterized by
-When the core voltage value is not within the proper range, feedback control may be performed to adjust the core voltage value within the proper range.

In the present embodiment,
6).
1. In the electronic control device described in
One power supply IC includes the first power supply circuit and the second power supply circuit.
Because it is an electronic control device characterized by
In some cases, the power supply voltage supplied to the CPU core can be monitored while ensuring the reliability of the operation while preventing an increase in power supply ICs.

<Appendix 2>
The embodiment described above is
1.
A power supply (for example, a power supply IC 131) that supplies a first voltage (for example, a voltage by the regulator 133) and a second voltage (for example, a voltage by the regulator 132);
A core (for example, core 124) that performs arithmetic processing;
A peripheral processing unit (for example, the circuit 121) that operates by the second voltage supplied from the power supply and the first voltage supplied from the power supply are used to generate a voltage supplied to the core. A core voltage generator (for example, the switching circuit 150);
A voltage control unit (for example, voltage control unit 123) that controls a voltage generated by the core voltage generation unit;
A voltage monitoring unit (for example, the monitoring unit 161) that monitors the voltage generated by the core voltage generation unit,
The voltage monitoring unit is driven by the second voltage.
Since it is an in-vehicle processing device (for example, the electronic control device 110) characterized by
-Even if the microcomputer is a two-power supply microcomputer (a microcomputer that operates by receiving two types of power supply voltages), it is possible to monitor the power supply voltage supplied to the core while ensuring operational reliability. A vehicle-mounted processing device (for example, an electronic control device) that can be provided can be provided.
Of the two types of power supply voltages supplied to the two-power supply microcomputer (the microcomputer that operates upon receiving two types of power supply voltages), the power supply voltage supplied to the core voltage generation unit (for example, the voltage by the regulator 133) Since the voltage monitoring unit is driven by another power supply voltage (for example, voltage by the regulator 132), it is not necessary to provide a new power supply in addition to the power supply provided for operating the microcomputer, and the cost is increased. May be suppressed.

Moreover, the embodiment described above is
2.
A power supply (for example, a power supply IC 231);
A core (for example, core 224) that performs arithmetic processing;
A core voltage generator (for example, a switching circuit 250) that generates a voltage supplied to the core using a voltage supplied from the power source;
A voltage controller (for example, a voltage controller 223) that controls a voltage generated by the core voltage generator;
A voltage monitoring unit (for example, the monitoring unit 261) that monitors the voltage generated by the core voltage generation unit, and the core and the voltage control unit are provided in an arithmetic device (for example, the microcomputer 220);
The power supply voltage generation unit is provided outside the arithmetic unit,
The core voltage monitoring unit is provided outside the arithmetic unit and uses a power source (for example, a power source for the regulator 232) provided separately from the power source.
Because it is an in-vehicle processing device characterized by
・ Even if the microcomputer is a single-power supply microcomputer (a microcomputer that operates by receiving one type of power supply voltage), it is possible to monitor the power supply voltage supplied to the core while ensuring operational reliability. A vehicle-mounted processing device (for example, an electronic control device) that can be provided can be provided.
In addition, since the voltage monitoring unit is driven by a power supply voltage (for example, voltage by the regulator 232) different from the power supply voltage for operating the microcomputer (voltage by the regulator 233 of the power supply IC 231), the operation of the voltage monitoring unit In some cases, the operation of the microcomputer is independent, and the power supply voltage supplied to the core can be monitored more reliably.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Electronic control apparatus, 2 ... Microcomputer, 3 ... 2nd power supply circuit, 4 ... 1st power supply circuit, 5 ... Core voltage generation circuit, 6 ... Voltage monitoring circuit, 7 ... 2nd circuit, 8 ... 1st 9 ... Voltage control circuit, 10 ... Core.

Claims (6)

A first power supply circuit for supplying a first voltage;
A second power supply circuit for supplying a second voltage;
A core voltage generation circuit for generating a third voltage using the first voltage supplied from the first power supply circuit;
A first circuit that operates with the first voltage supplied by the first power supply circuit; and a CPU core that operates with the third voltage generated by the core voltage generation circuit. Microcomputer to do,
A voltage monitoring circuit that operates with the second voltage supplied by the second power supply circuit and that monitors the voltage value of the third voltage generated by the core voltage generation circuit;
Comprising
An electronic control device characterized by that. The electronic control device according to claim 1.
The microcomputer further includes a second circuit that operates by the second voltage supplied by the second power supply circuit,
An electronic control device characterized by that. The electronic control device according to claim 1.
The voltage monitoring circuit resets the microcomputer when the voltage value of the second voltage is not within an appropriate range.
An electronic control device characterized by that. The electronic control device according to claim 1.
The microcomputer further includes a voltage control circuit that controls a voltage value of the third voltage generated by the core voltage generation circuit,
The core voltage generation circuit can change the voltage value of the third voltage by control from the voltage control circuit.
An electronic control device characterized by that. The electronic control device according to claim 4.
The voltage monitoring circuit notifies the voltage control circuit of a monitoring result of the voltage value of the third voltage;
The voltage control circuit controls the core voltage generation circuit based on the monitoring result from the voltage monitoring circuit.
An electronic control device characterized by that. The electronic control device according to claim 1.
One power supply IC includes the first power supply circuit and the second power supply circuit.
An electronic control device characterized by that.

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