JP2004014782A - Semiconductor integrated circuit device, microcomputer, and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a semiconductor integrated circuit device which can control to cut off power without increasing its manufacturing cost, a microcomputer, and an electronic apparatus. <P>SOLUTION: The semiconductor integrated circuit device comprises a first circuit group 20 which is required to keep its power supply ON constantly, and a second circuit group 30 which does not require to keep its power supply ON constantly. A first power supply regulator 40 connected to the first circuit group 20 and a second power supply regulator 50 connected to the second circuit group 30 and capable of turning a power supply voltage supplied to the second circuit group 30 ON or OFF by the prescribed control signals 70 may be included. Or, the first power supply regulator 40 connected to the first circuit group 20, the second power supply regulator 50, and an analog switching circuit which is connected to the second circuit group 30 and capable of turning a power supply voltage supplied to the second circuit group 30 from the second power supply regulator ON or OFF by the prescribed control signals may be included. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a semiconductor integrated circuit device, a microcomputer, and an electronic apparatus using the microcomputer.
[0002]
BACKGROUND ART AND PROBLEMS TO BE SOLVED BY THE INVENTION
In recent years, the power consumption when the IC (semiconductor integrated circuit device) is stationary tends to increase with the miniaturization of the manufacturing process of the IC (semiconductor integrated circuit device).
[0003]
For example, in a microcomputer equipped with a CPU, an SRAM, an RTC (real-time clock), and the like, the SRAM and the RTC need to be always turned on, but the CPU does not need to be always turned on.
[0004]
Therefore, the power supply must be kept on at all times, and the circuit group that does not need to be always powered on is separated from the power supply. When there is no power, the power is turned off to reduce power consumption during standby and non-operation.
[0005]
However, in the conventional power supply separation IC, since a power supply regulator and a switch for power supply separation control are arranged outside the IC, the mounting area of the board increases, the circuit scale becomes complicated, the number of parts increases, There has been a problem that the number of control terminals and power supply terminals required for the IC increases, resulting in an increase in cost.
[0006]
The present invention has been made in view of the above technical problems, and an object of the present invention is to provide a semiconductor integrated circuit device, a microcomputer, and an electronic device capable of controlling power supply separation without incurring high cost. Is to provide.
[0007]
[Means for Solving the Problems]
(1) The present invention is a semiconductor integrated circuit device including a first circuit group that needs to be constantly powered on and a second circuit group that does not need to be constantly powered on,
A first power supply regulator connected to the first circuit group;
A second power supply regulator connected to the second circuit group and capable of controlling ON / OFF of a power supply voltage supplied to the second circuit group by a predetermined control signal.
(2) The present invention is a semiconductor integrated circuit device including a first circuit group that needs to be constantly turned on and a second circuit group that does not need to be always turned on,
A power regulator connected to the first circuit group;
An analog switch circuit connected to the power supply regulator and the second circuit group and capable of controlling ON / OFF of a power supply voltage supplied to the second circuit group by the power supply regulator by a predetermined control signal; It is characterized by.
(3) The present invention is a microcomputer constituted by any one of the semiconductor integrated circuit devices described above.
(4) The present invention provides the microcomputer described above,
Input means for data to be processed by the microcomputer,
Output means for outputting data processed by the microcomputer.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
[0009]
1. FIG. 1 is a diagram for explaining a configuration of a semiconductor integrated circuit device according to a first embodiment.
[0010]
The semiconductor integrated circuit device 10 according to the first embodiment includes a first circuit group 20 that needs to be constantly turned on and a second circuit group 30 that does not need to be always turned on.
[0011]
Here, the first circuit group 20 that needs to be constantly turned on is, for example, an SRAM or an RTC. The second circuit group 30 that does not need to be constantly turned on is a CPU or the like.
[0012]
The first power supply regulator 40 connected to the first circuit group 20 and the control signal 70 connected to the second circuit group 30 and input via the external terminal 60 are used to control the second circuit group 30. And a second power supply regulator 50 capable of controlling ON and OFF of a power supply voltage supplied to the power supply. The first power supply regulator 40 and the second power supply regulator 50 can supply an arbitrary constant voltage necessary for the operation of the semiconductor integrated circuit device 10 to the first circuit group 20 and the second circuit group 30. It is configured.
[0013]
The control signal 70 may output a signal of a predetermined level (H or L) when it is determined that an external device (not shown) is in a non-operation state or a standby state, for example.
[0014]
Here, the second power supply regulator 50 receives a control signal 70 indicating that the power supply of the second circuit group 30 may be turned off, for example, during non-operation or standby time. The power supply voltage supplied to the power supply 30 is turned off. In this way, for example, the power supply voltage supplied to the second circuit group 30 can be turned off during non-operation or standby, and a semiconductor integrated circuit device with low power consumption during non-operation or standby can be realized. You can do it.
[0015]
In addition, since it can be realized by providing at least two regulators inside the semiconductor integrated circuit device and adding an external terminal to which a control signal is input, the mounting area of the substrate does not increase. Further, since there is no need to provide an external regulator, the number of components is not increased, and the circuit design such as wiring is not complicated. Further, the number of control terminals and power supply terminals required for the semiconductor integrated circuit device does not increase. Therefore, it is possible to realize a semiconductor integrated circuit device which is low in cost and consumes less power during non-operation or standby than when controlled by a power supply regulator provided outside.
[0016]
FIGS. 2A and 2B are an example of a block diagram of a power supply IC functioning as a first power supply regulator and a second power supply regulator and a functional description of terminals.
[0017]
The power supply IC is a constant voltage supply circuit, and the gain can be freely changed by an external resistor so that an arbitrary voltage is formed on the same substrate as the power supply IC (for example, the first circuit in FIG. 1). It is configured to be able to be supplied to the group 20 and the second circuit group 30). Here, since the constant voltage is output from the VRG terminal, the output voltage from the VRG terminal can be supplied to the logic IC (for example, the first circuit group 20 or the second circuit group 30 in FIG. 1).
[0018]
The reference voltage input from the amplifier input terminal VIN may be built in or may be input from outside.
[0019]
When functioning as the second power supply regulator, by inputting a control signal (for example, 70 in FIG. 1) from the XSLP terminal, ON / OFF of the constant voltage output from the VRG terminal can be controlled.
[0020]
FIGS. 3A and 3B are diagrams for explaining a connection example of a power supply IC. FIG. 3A shows an example in which the reference voltage 110 built in the power supply IC is used. The built-in reference voltage 110 is, for example, 1.2V ± 0.10V. The output voltage (VRC) is given by the following formula using resistors R1 and R2.
VRG = (1 + R2 ÷ R1) × VREF
FIG. 3B is an example in which the power supply voltage of the system is divided and used as a reference voltage. The reference voltage 110 of the system is, for example, 3.3V ± 0.30V. The output voltage (VRC) is given by the following formula using resistors R1 and R2.
VRG = | (R1 ÷ (R1 + R2) | × VDD
2. Second Embodiment Semiconductor Integrated Circuit Device of Second Embodiment FIG. 4 is a diagram for describing a configuration of a semiconductor integrated circuit device of a second embodiment.
[0021]
The semiconductor integrated circuit device according to the second embodiment includes a first circuit group 220 that needs to keep power ON at all times and a second circuit group 230 that does not need to keep power ON at all times.
[0022]
Here, the first circuit group 220 that needs to be always turned on includes, for example, an SRAM and an RTC. The second circuit group 230 that does not need to be constantly turned on is a CPU or the like.
[0023]
The power regulator 240 connected to the first circuit group 220 and the control signal 270 connected to the power regulator 240 and the second circuit group 230 and input via the external terminal 260 are used to control the power regulator 240 And an analog switch circuit 250 capable of controlling ON / OFF of a power supply voltage supplied to the second circuit group.
[0024]
The power regulator 240 is configured to be able to supply an arbitrary constant voltage required for the operation of the semiconductor integrated circuit device to the first circuit group 220 and the second circuit group 230.
[0025]
The control signal 270 may output a signal of a predetermined level (H or L), for example, when it is determined that an external device (not shown) is in a non-operation state or a standby state.
[0026]
Here, the analog switch 250 is turned off by receiving a control signal indicating that the power supply of the second circuit group 230 may be turned off, for example, during non-operation or standby time. The power supply voltage supplied to the second circuit group 230 can be turned off. In this way, for example, the power supply voltage supplied to the second circuit group 230 can be turned off during non-operation or standby, and a semiconductor integrated circuit device with low power consumption during non-operation or standby can be realized. You can do it.
[0027]
In addition, since it can be realized by providing a regulator and an analog switch inside the semiconductor integrated circuit device and adding an external terminal to which a control signal is input, the mounting area of the substrate does not increase. Further, since there is no need to provide an external regulator, the number of components is not increased, and the circuit design such as wiring is not complicated. Further, the number of control terminals and power supply terminals required for the semiconductor integrated circuit device does not increase. Therefore, it is possible to realize a semiconductor integrated circuit device which is low in cost and consumes less power during non-operation or standby than when controlled by a power supply regulator provided outside.
[0028]
3. FIG. 5 is an example of a configuration of a microcomputer configured using the semiconductor integrated circuit device of the first embodiment.
[0029]
The microcomputer includes a first regulator 40, a second regulator 50, a CPU 22, a predetermined function realizing circuit 24, an SRAM & RTC 32, and the like.
[0030]
Here, the CPU 22 and the predetermined function realizing circuit 24 belong to a circuit group (second circuit group) whose power can be turned off during standby or non-operation. The SRAM & RTC 32 and the like belong to a circuit group (first circuit group) that needs to keep the power on at all times.
[0031]
The first regulator 40 generates a constant voltage based on a backup power supply voltage input from VBACK, a reference voltage input from Vref1, and the like, and outputs the same from VRG1.
[0032]
The second regulator 50 generates a constant voltage based on a power supply voltage input from VDDH, a reference voltage input from Vref2, and the like, and outputs the same from VRG2. Then, ON / OFF of the constant voltage VRG2 output from VRG2 is controlled by a control signal input from XSLP2. For example, when the control signal is at the “L” level, the constant voltage VRG2 output from the VRG2 may be turned off.
[0033]
In the above embodiment, the microcomputer configured using the semiconductor integrated circuit device of the first embodiment has been described, but the present invention is not limited to this. For example, a microcomputer may be configured using the semiconductor integrated circuit device according to the second embodiment.
[0034]
4. Electronic Equipment Next, electronic equipment including the above-described microcomputer will be described.
For example, FIG. 6A shows an internal block diagram of a car navigation system which is one of the electronic devices, and FIG. 7A shows an external view thereof. The operation of the car navigation system is performed using the remote controller 710, and the position detection unit 720 detects the position of the car based on information from the GPS and the gyro. Information such as a map is stored in the CDROM 730 (information storage medium). The memory 740 is a memory that serves as a work area for image processing and voice processing, and the generated image is displayed to the driver using the image output unit 750. The generated car navigation guide voice is output to the driver using the sound output unit 735. The microcomputer 700 receives information from an information input source such as a remote controller 710, a position detection unit 720, and a CDROM 730, performs various processes, and outputs the processed information to output devices such as an image output unit 750 and a sound output unit 735. Output using.
[0035]
FIG. 6B shows an internal block diagram of a game device which is one of the electronic devices, and FIG. 7B shows an external view thereof. In this game device, a game image and a game sound are generated using the memory 790 as a work area based on the player operation information from the game controller 760, the game program from the CDROM 770, the player information from the IC card 780, and the like. The output unit 810 outputs the sound using the sound output unit 800.
[0036]
FIG. 6C shows an internal block diagram of a printer which is one of the electronic devices, and FIG. 7C shows an external view thereof. In this printer, based on operation information from the operation panel 820 and character information from the code memory 830 and the font memory 840, a print image is generated using the bitmap memory 850 as a work area and output using the print output unit 860. . Further, the status and mode of the printer are notified to the user using the display panel 870.
[0037]
In addition to the above, examples of electronic devices to which a microcomputer can be applied include a mobile phone (cellular phone), a PHS, a pager, a portable information terminal, a digital camera, a hard disk device, an optical disk (CD, DVD) device, and a magneto-optical disk. (MO) devices, audio equipment, electronic organizers, electronic desk calculators, POS terminals, devices with touch panels, projectors, word processors, personal computers, televisions, viewfinders, and monitor direct-view video tape recorders. You can think.
[0038]
The present invention is not limited to the present embodiment, and various modifications can be made within the scope of the present invention.
[0039]
Also, the configuration of the electronic device of the present invention is not limited to those described with reference to FIGS. 6A to 6C and FIGS. 7A to 7C, and various modifications can be made. [Brief description of the drawings]
FIG. 1 is a diagram for describing a configuration of a semiconductor integrated circuit device according to a first embodiment.
FIGS. 2A and 2B are a block diagram of a power supply IC functioning as a first power supply regulator and a second power supply regulator, and an example of a function description of terminals.
FIGS. 3A and 3B are diagrams illustrating a connection example of a power supply IC.
FIG. 4 is a diagram illustrating a configuration of a semiconductor integrated circuit device according to a second embodiment;
FIG. 5 is an example of a configuration of a microcomputer configured using the semiconductor integrated circuit device of the first embodiment.
FIGS. 6A, 6B, and 6C illustrate an example of a block diagram of an electronic device including a microcomputer.
FIGS. 7A, 7B, and 7C are examples of external views of various electronic devices.
[Explanation of symbols]
Reference Signs List 10 semiconductor integrated circuit device 20 first circuit group 30 second circuit group 40 first power regulator 50 second power regulator 60 external terminal 70 control signal 210 semiconductor integrated circuit device 220 first circuit group 230 second Circuit group 240 Power regulator 250 Analog switch 260 External terminal 270 Control signal 700 Microcomputer 710 Remote control 720 Position detector 735, 800 Sound output unit 740 Memory 750, 810 Image output unit 770 CDROM
780 card 790 IC memory 800 sound output unit 820 operation panel 830 code memory 840 font memory 850 bitmap memory 860 print output unit 870 display panel

Claims (4)

What is claimed is: 1. A semiconductor integrated circuit device including a first circuit group that needs to be always turned on and a second circuit group that does not need to be always turned on,
A first power supply regulator connected to the first circuit group;
A second power supply regulator connected to the second circuit group and capable of controlling ON / OFF of a power supply voltage supplied to the second circuit group by a predetermined control signal; . What is claimed is: 1. A semiconductor integrated circuit device including a first circuit group that needs to be always turned on and a second circuit group that does not need to be always turned on,
A power regulator connected to the first circuit group;
An analog switch circuit connected to the power supply regulator and the second circuit group and capable of controlling ON / OFF of a power supply voltage supplied to the second circuit group by the power supply regulator by a predetermined control signal; A semiconductor integrated circuit device characterized by the above-mentioned. A microcomputer comprising the semiconductor integrated circuit device according to claim 1. A microcomputer according to claim 3,
Input means for data to be processed by the microcomputer,
Output means for outputting data processed by the microcomputer.

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