JP5584190B2 - IC output port switching control device - Google Patents

Description

  The present invention relates to an IC output port switching control device that controls an output port of an IC.

  Conventionally, as shown in FIG. 5, the vehicle 81 is equipped with an electronic key system 83 that performs key verification using an ID code transmitted from the electronic key 82 by radio. The electronic key system 83 is provided with a collation ECU 84 that collates the ID code of the electronic key 82 and a vehicle receiver 85 that can receive the ID signal Sa transmitted from the electronic key 82. The vehicle receiver 85 is connected to the power supply port 86 of the verification ECU 84, and power is supplied from the power supply port 86. When the vehicle receiver 85 receives the ID signal Sa, the verification ECU 84 executes ID verification. When the ID verification is confirmed, for example, the verification ECU 84 permits / executes locking / unlocking of the vehicle door and engine start.

  By the way, in general, this type of verification ECU 84 does not always take a wake operation as shown in FIG. 6, and saves standby power (power supply) when it does not operate for a certain period of time. In order to do this, the operation shifts to the sleep operation and waits for the next operation. Thereby, since it is not necessary to always supply electric power to collation ECU84, the electric power consumed by collation ECU84 is restrained low, and the effect becomes effective for effective use of power supply electric power.

  However, the verification ECU 84 needs to perform a minimum operation during the sleep operation, and this operation is performed by the software control unit 87 in the verification ECU 84. The software control unit 87 is a functional unit that operates based on a program (application) written in a memory (not shown) in the verification ECU 84, and performs an active operation intermittently at a predetermined cycle interval (for example, 20 mS interval). During the sleep operation, the verification ECU 84 repeatedly performs an operation that should be performed at a minimum.

  In addition, the vehicle receiver 85 performs a polling operation for periodically monitoring the reception of radio waves at a predetermined cycle interval (for example, 200 mS interval) so that it can cope with any time the ID signal Sa is transmitted from the electronic key 82. There is a need (see, for example, Patent Document 1). For this reason, during the sleep operation, the verification ECU 84 supplies power to the vehicle receiver 85 from the power port 86 at a timing corresponding to the polling cycle in the operation cycle of the software control unit 87, and starts the vehicle receiver 85. Take.

JP 2009-235668 A

  By the way, in the vehicle receiver 85 to which power is supplied, before performing a radio wave receiving operation, a time required for the supplied power to stabilize, that is, a so-called power supply stabilization waiting time Sr is required. Therefore, the verification ECU 84 starts power supply from the power port 86 to the vehicle receiver 85 prior to the start of the radio wave standby operation in a state where the vehicle receiver 85 can receive radio waves during the polling operation during sleep. There is a need. Incidentally, the power supply stabilization waiting time Sr is, for example, about 10 mS for a general vehicle receiver 85.

  However, since the power supply port 86 can be controlled only in the operation cycle of the software control unit 87 when the verification ECU 84 is in the sleep state, the pulse Pb for starting the reception standby operation is started when the power supply taking into consideration the power supply stability is started. It is necessary to start power supply from the pulse Pa of the previous cycle. Usually, since the operation cycle of the software control unit 87 is 20 mS, as a result, the power supply darkening waiting time Sr becomes 20 mS. There was no current situation. Therefore, there is a problem that dark current increases and hinders power saving of the power source.

  An object of the present invention is to provide an IC output port control device that can save power in a power source.

  In order to solve the above problems, in the present invention, the software control unit in the IC operates by being repeatedly activated at a specific operation cycle, and the software control unit operates at a high cycle during wake and is in sleep mode. In the IC output port switching control device in which the software control unit operates at a low cycle, and a signal is output from the output port at a periodic cycle determined from the operation cycle of the software control unit, and the electrical component can be operated. A PWM control unit for operating other electrical components by PWM control, and during the sleep, the output port is switched from the software control unit to the PWM control unit, and the output port is controlled by the PWM control unit. Thus, the gist is provided with switching means that enables the electrical component to operate by the PWM control.

  According to the configuration of the present invention, the IC operates when the internal software control unit is activated at a predetermined operation cycle, operates at a high cycle during wake operation, and operates at a low cycle during sleep to reduce standby power. . In addition, the IC operates the electrical component by outputting a signal from the output port to the electrical component at a regular cycle determined by the operation cycle of the software control unit. That is, the electrical component is activated / operated at a specific cycle by a signal output at a regular cycle from the output port of the IC.

  In the case of the present invention, since the output port is switched from software control to PWM control during the sleep of the IC, the electrical component can be operated at the rising edge of the PWM control pulse. For this reason, even when the software control unit takes a low cycle, that is, a slow operation during sleep, it is possible to operate the electrical component with the PWM control pulse regardless of the software control cycle interval. The signal supply from the output port to the electrical component can be optimized. Therefore, it is not necessary to send a signal from the output port to the electrical component, so that the effect of reducing dark current and power saving of the power source is enhanced.

  In the present invention, the output port is a power supply port that supplies power to the electrical component, and the switching unit is configured to detect a rise of a pulse output in the PWM control when the power supply port is switched to PWM control. The gist is to ensure a power supply stabilization wait time for the electrical component by starting the power supply to the electrical component. According to this configuration, power supply from the power supply port to the electrical component can be started at the rising edge of the PWM control pulse, so that the power supply stabilization wait time can be set to an optimum time. For this reason, the effect of reducing dark current and, in turn, power saving of the power source is enhanced.

  The gist of the present invention is that the electrical component is a vehicle receiver that receives an ID signal transmitted from an electronic key in a vehicle. According to this configuration, since it is possible to minimize the power supply stabilization waiting time required for the vehicle receiver, it is possible to reduce the power consumed by the vehicle receiver.

  The gist of the present invention is that one period of the PWM control is set longer than a period interval of the software control unit during the sleep. According to this configuration, since the power supply from the output port to the electrical component is started until the next software control cycle arrives, the PWM control pulse is supplied. There is no possibility of interruption.

  The gist of the present invention is that the duty ratio of the PWM control is set so as to take a power supply stabilization waiting time to be applied to the electrical component. According to this configuration, the power supply stabilization waiting time can be set to an optimum time by a simple process of adjusting the duty ratio of PWM control.

  According to the present invention, power can be saved in an IC.

The block diagram of the wireless key system of one Embodiment. The timing chart which shows the operation | movement aspect of collation ECU, a software control part, and a power supply port. (A), (b) is a timing chart explaining the control content of PWM control. The timing chart which shows the operation | movement aspect of collation ECU, a software control part, and a power supply port. The block diagram of the conventional electronic key system. The timing chart which shows the operation | movement aspect of collation ECU, a software control part, and a power supply port.

An embodiment of an IC output port switching control device embodying the present invention will be described below with reference to FIGS.
As shown in FIG. 1, the vehicle 1 is provided with a wireless key system 3 that executes ID collation triggered by communication from the wireless key 2. In the wireless key system 3, the in-vehicle device can be operated by remote operation using the wireless key 2. Examples of the in-vehicle device include a hinge rotation door, a slide door, and a luggage door. The wireless key 2 in this example is a kind of electronic key that can transmit the wireless signal Swl by an operation on the key side. The wireless key 2 corresponds to an electronic key, and the wireless signal Swl corresponds to an ID signal.

  In this case, the vehicle 1 includes a verification ECU (Electronic Control Unit) 4 that authenticates the validity of the wireless key 2, a body ECU 5 that manages the power supply of various electrical components of the vehicle 1, and an engine ECU 6 that controls the engine. These are provided and connected by a bus 7 in the vehicle. The ID code of the wireless key 2 registered in the vehicle 1 is stored in the memory (not shown) of the verification ECU 4. A door lock motor 8 serving as a drive source for door locking / unlocking is connected to the verification ECU 4. The verification ECU 4 is composed of, for example, a one-chip IC (Integrated Circuit).

  The verification ECU 4 is connected to a vehicle receiver 9 that can receive a radio wave in the UHF (Ultra High Frequency) band. The vehicle receiver 9 is connected to the power supply port 11 of the verification ECU 4 via the power supply line 10, and power is supplied from the power supply port 11. The verification ECU 4 is connected to the vehicle receiver 9 through the data line 12, and received data (ID code or the like) is input from the vehicle receiver 9 through the data line 12. The vehicle receiver 9 corresponds to an electrical component, and the power supply port 11 corresponds to an output port.

  The wireless key 2 is provided with a wireless button 13 corresponding to an in-vehicle device to be remotely operated. When the wireless button 13 is operated, a wireless signal Swl is transmitted from the wireless key 2 by UHF radio waves. The wireless signal Swl includes an ID code of the wireless key 2 and a function code corresponding to the operated wireless button 13. When the verification signal is received by the vehicle receiver 9, the verification ECU 4 performs ID verification (wireless verification) using the ID code in the wireless signal Swl, and if the verification is confirmed, it is included in the same signal. Operate the in-vehicle device according to the function code.

  The vehicle 1 is provided with a mechanical key system 15 that switches the power state of the vehicle 1 by a mechanical operation using the key plate 14 of the wireless key 2. In this case, a key cylinder 16 that can be rotated by a regular key plate 14 is provided in the driver's seat of the vehicle 1. The key cylinder 16 is operated to, for example, each position of an IG (Ignition) off position, an ACC (Accessory) on position, an IG on position, and an ST (Starter) on position.

  The key cylinder 16 is provided with an ignition switch 17 that switches a switch state in accordance with each rotational position of a rotor (not shown) in the key cylinder 16. The ignition switch 17 includes, for example, an ACC relay, an IG relay, and an ST relay. When the key plate 14 of the wireless key 2 is inserted into the key cylinder 16 and rotated, the ignition switch 17 is switched to a switch state corresponding to the rotational position of the key cylinder 16. At this time, when the key cylinder 16 is operated to the ST position, the starter motor rotates and the engine 18 is started.

  The verification ECU 4 is provided with a software control unit 19 that executes various operations based on a program (application) written in the memory of the verification ECU 4. The software control unit 19 can execute software control such as ID collation with the wireless key 2 and operation command output to the ECUs 5 and 6 when the collation is established.

  As shown in FIG. 2, the verification ECU 4 normally takes a wake operation. During the wake operation, the software control unit 19 operates at a high cycle (period interval: for example, 5 mS) based on the clock signal output from the high cycle clock 20. In addition, when the situation where the verification ECU 4 does not operate for a certain period of time during the wake operation continues, the verification ECU 4 switches to the sleep operation and waits for the next operation to save power. During the sleep operation, the verification ECU 4 performs minimum software control at a predetermined cycle by the internal software control unit 19. During the sleep operation, the software control unit 19 operates at a low cycle (cycle interval: 20 mS, for example) based on the clock signal output from the low cycle clock 21, and repeatedly executes the minimum operation that should be performed during the sleep. .

  The vehicle receiver 9 searches for radio waves by a polling operation that periodically monitors radio wave reception at a predetermined periodic interval (for example, 200 mS interval) so that it can cope with the wireless signal Swl transmitted from the wireless key 2 at any time. To do. Therefore, the verification ECU 4 supplies power from the power port 11 to the vehicle receiver 9 at the activation timing in accordance with the polling cycle in the operation cycle (startup cycle) of the software control unit 19 and periodically starts the vehicle receiver 9. Let As a result, the vehicle receiver 9 performs a reception standby operation in the polling cycle, and can receive the wireless signal Swl.

  As shown in FIG. 1, the verification ECU 4 is provided with a PWM control unit 22 that controls the in-vehicle device by PWM (Pulse Width Modulation) control. The PWM control unit 22 of this example is a control function that is originally incorporated in the verification ECU 4 and controls lighting of the indicator 23 disposed around the key cylinder 16 as an in-vehicle device, for example. The PWM control unit 22 operates with the high-cycle clock 20 when the verification ECU 4 is awake, and operates with the low-cycle clock 21 when the verification ECU 4 is in sleep. Although the indicator 23 is repeatedly turned on / off by PWM control, it appears to be lit by human eyes because of the high-speed intermittent drive. When the PWM duty ratio is set high as shown in FIG. 3 (a), the luminance of the indicator 23 increases, and when the PWM duty ratio is set low as shown in FIG. 3 (b), The brightness of the indicator 23 is lowered. The indicator 23 corresponds to another electrical component.

  By the way, as described in the background art, the general vehicle receiver 9 requires a predetermined power supply stabilization waiting time Ts as shown in FIG. 4 as a reception preparation operation after the power is turned on until radio waves can be received. It is. The power supply stabilization waiting time Ts is a time required for the power supplied from the power supply port 11 to the vehicle receiver 9 to be stabilized in the vehicle receiver 9 and is, for example, about 10 mS. Therefore, it is necessary for the verification ECU 4 to start supplying power from the power port 11 to the vehicle receiver 9 at a stage before the pulse (for example, P2 and P4 shown in FIG. 4) for starting the reception standby operation in the software control. .

  Here, when the verification ECU 4 is in the wake operation, the operation period of the software control unit 19 is as short as 5 mS, so that even when the power supply stabilization waiting time Ts is required to be 10 mS, the power management is sufficient by software control. Therefore, during the wake operation, the software control unit 19 starts power supply from the power supply port 11 at a pulse P1 having a cycle two prior to the reception standby operation start pulse P2 in the software control operation cycle. As a result, a power supply stabilization waiting time Ts of about 10 mS is secured from the power supply port 11 to the vehicle receiver 9.

  As shown in FIG. 4, the verification ECU 4 of this example uses the PWM resource (PWM control unit 22) of the verification ECU 4 during sleep to stabilize the power supply of the vehicle receiver 9 without software control. An ECU power port control function for ensuring the waiting time Ts is provided. Since the PWM control takes a waveform in which the pulse Px rises during the processing, the supply of power to the vehicle receiver 9 is started using the rise of the pulse Px. The ECU power supply port control function of this example switches the control of the power supply port 11 to PWM control at the pulse P3 of the cycle immediately before the reception standby operation start pulse P4 in the software control at the time of sleep. 11 to supply power to the vehicle receiver 9. The pulse Px corresponds to a power supply signal.

  In this case, as shown in FIG. 1, the software control unit 19 in the verification ECU 4 is provided with a switching control unit 24 that switches the connection state between the software control unit 19 and the PWM control unit 22 and the power supply port 11. The switching control unit 24 in this example controls one of the software control unit 19 and the PWM control unit 22 by controlling the switch unit 25 provided between the software control unit 19 and the PWM control unit 22 and the power supply port 11. , Selectively connected to the power port 11. The switch unit 25 is a member that can be imaged as a function, and is not necessarily required as long as one of the software control unit 19 and the PWM control unit 22 can be selectively connected to the power supply port 11. The switching control unit 24 and the switch unit 25 constitute switching means.

  The switching control unit 24 in this example is a pulse P3 having a cycle immediately before the pulse P4 for starting the reception standby operation in software control during sleep, and the PWM control unit from the software control unit 19 side to move the movable contact 25a of the switch unit 25. The PWM control unit 22 is connected to the power supply port 11 by connecting to the 22 side. Thus, power supply to the vehicle receiver 9 is started from the rise of the PWM control pulse Px, and the time from this pulse rise to the reception standby operation start pulse P4 is secured as the power supply stabilization wait time Ts.

  In this example, the PWM control cycle is set to a value longer than the operation cycle of the software control unit 19 (20 mS in this example). Further, the duty ratio of the PWM control is set according to the timing at which power supply to the vehicle receiver 9 is to be started. For example, when it is desired to set the power supply start timing early, the duty ratio is set high. When the power supply start timing is set late, the duty ratio is set low. After the switch unit 25 is connected to the PWM control unit 22 side, the switching control unit 24 returns the connection of the switch unit 25 to the original software control unit 19 side in the next software control cycle.

Next, the operation of the ECU power port control function of this example will be described with reference to FIG.
As shown in FIG. 4, during the wake operation of the verification ECU 4, the software control unit 19 performs software control with a high cycle (5 mS cycle) based on the clock signal of the high cycle clock 20. For this reason, the verification ECU 4 can operate at high speed and can execute various control processes in a short time.

  Normally, the verification ECU 4 moves to turn on the vehicle receiver 9 to place the vehicle receiver 9 in a reception standby state every time a polling period arrives in the software control operation period. That is, the verification ECU 4 turns on the vehicle receiver 9 in a polling cycle and periodically puts it into a reception standby state. The verification ECU 4 during the wake operation raises the power supply port 11 from the Lo level to the Hi level at the pulse P1 two times before the reception standby operation start pulse P2 determined from the polling cycle, and starts supplying power to the vehicle receiver 9. . Therefore, the vehicle receiver 9 enters the reception standby state, and the wireless signal Swl can be received.

  Here, the verification ECU 4 shifts to the sleep operation when the wake operation does not operate for a certain period of time, that is, when the vehicle receiver 9 does not receive radio waves for a certain period of time. When the verification ECU 4 shifts to the sleep operation, the software control unit 19 performs software control with a low cycle (20 mS cycle) based on the clock signal of the low cycle clock 21. That is, during sleep, software control is performed with the low-cycle clock 21 that does not require power and has a low operation speed in order to suppress standby power.

  At the time of this sleep operation, the switching control unit 24 switches the switch unit 25 to the previous software control unit 19 when the reception standby operation start pulse P4 determined from the polling cycle is one pulse P3 before the pulse P3 in the software control operation cycle. The PWM control unit 22 is connected to the power supply port 11 from the side. That is, the control of the power supply port 11 is switched from the previous software control to the PWM control.

  Therefore, the PWM control unit 22 supplies the pulse Px that rises in the PWM control as the power source of the vehicle receiver 9 from the power supply port 11. That is, the power supply port 11 is raised from the Lo level to the Hi level by the rise of the PWM control pulse Px, and the power supply to the vehicle receiver 9 is started. As a result, the vehicle receiver 9 takes a reception preparation operation, and the time during which the PWM control pulse Px is at the Hi level is the power supply stabilization waiting time Ts. Therefore, since the power supply stabilization waiting time Ts can be set by the duty ratio of PWM control, the power supply stabilization waiting time Ts can be set to about 10 mS which is the minimum necessary for power supply stabilization.

  When the next software control cycle comes during the PWM control, the switching control unit 24 connects the switch unit 25 from the PWM control unit 22 side to the software control unit 19 side, and returns control of the power supply port 11 to software control. . Therefore, the management of the power port 11 is returned to the software control unit 19, and the power management as before can be performed.

  As described above, in this example, when the verification ECU 4 takes a sleep operation, the PWM control unit 22 originally provided in the verification ECU 4 is used to start the power supply to the vehicle receiver 9 without using the software control unit 19. It was possible. That is, when the verification ECU 4 is in the sleep operation, the power supply port 11 is switched from the previous software control to the PWM control one cycle before the pulse P4 for starting the reception standby operation in the software control, and the pulse rise determined by the duty ratio of the PWM control At this timing, power supply to the vehicle receiver 9 is started.

  For this reason, since it becomes possible to pinpoint the power supply stabilization waiting time Ts to the minimum necessary time, the power supply stabilization waiting time Ts can be shortened as compared with the conventional case. Therefore, the dark current resulting from the need for the useless power supply stabilization waiting time Ts is reduced, so that the effect of power saving of the power supply is enhanced.

According to the configuration of the present embodiment, the following effects can be obtained.
(1) During the sleep of the verification ECU 4, the power supply port 11 is controlled by PWM control by switching the connection of the power supply port 11 from the software control unit 19 to the PWM control unit 22 in the polling cycle of the vehicle receiver 9. For this reason, since it becomes possible to supply power to the vehicle receiver 9 using the PWM resource, it is possible to supply power to the vehicle receiver 9 at the rising edge of the PWM control pulse Px. Therefore, even when the verification ECU 4 operates in a low cycle during sleep, power can be supplied to the vehicle receiver 9 with the duty ratio of PWM control regardless of the software control cycle interval. It is possible to optimize the start timing of the power supply from 11 to the vehicle receiver 9. That is, the power supply stabilization waiting time Ts can be set to 10 mS which is the minimum necessary for power supply stabilization without changing the control mode of software control. Therefore, since it is not necessary to wastefully flow power from the power port 11 to the vehicle receiver 9, dark current can be reduced, and power can be saved.

  (2) As a method for optimizing (shortening) the power supply stabilization wait time Ts, for example, it is possible to switch the setting of the software control operation cycle to the optimum 10 mS as the power supply stabilization wait time Ts for each polling cycle. is there. However, this method requires the software control unit 19 to perform extra processing, and cannot achieve the purpose of reducing dark current. In addition, the software control unit 19 imposes irregular processing, which leads to a problem of complicated software control. On the other hand, this example is particularly effective even from the viewpoint that these problems do not occur.

(3) Since the power supply stabilization waiting time Ts necessary for the vehicle receiver 9 can be optimized, the power applied to the vehicle receiver 9 can be saved.
(4) One cycle of PWM control is set to a value equal to or greater than the cycle interval (20 mS) of software control during sleep. For this reason, the PWM control pulse Px is maintained at the Hi level during the next software control period after the power supply is started from the power supply port 11 to the vehicle receiver 9 by the PWM control. There will be no interruptions along the way.

  (5) The duty ratio of PWM control is set to a ratio at which power supply from the power supply port 11 to the vehicle receiver 9 is to be started. Therefore, the power supply stabilization waiting time Ts can be set to an optimum time by a simple process of adjusting the duty ratio of the PWM control.

Note that the embodiment is not limited to the configuration described so far, and may be modified as follows.
-The duty ratio of PWM control is not limited to a fixed value. For example, the duty of PWM control can be changed, and the power supply stabilization wait time Ts can be arbitrarily adjusted.

The software control unit 19 may perform any process as long as it operates based on a program.
The vehicle receiver 9 is not limited to a receiver that can receive UHF radio waves, and may be a receiver that receives other frequencies such as HF (High Frequency), for example.

Each period described in the embodiment is not limited to the values described in the embodiment, and can be appropriately changed to other values.
The output port is not limited to the power supply port 11 and may be any port that can output a signal.

-An electrical component is not limited to the vehicle receiver 9, It can change into another apparatus and apparatus.
Other electrical components that are PWM controlled are not limited to the indicator 23, and can be changed to other devices and apparatuses.

-IC is not limited to collation ECU4, It can change into other ECU.
The wireless key system 3 is not limited to a system that remotely controls locking / unlocking of the vehicle door, and may be a system that can remotely operate devices other than the vehicle door.

  The electronic key system to which the ECU power port control function of this example is applied is not limited to the wireless key system 3. For example, it may be a key operation free system that performs ID collation with an electronic key by narrow-area radio in response to communication from the vehicle 1, or a short-range wireless communication system that performs ID collation with an electronic key by short-range radio. .

  The ECU power supply port control function of this example is not applied to the electronic key system of the vehicle 1 and can be applied to other systems. Further, the present invention is not limited to being applied to the vehicle 1 and can be applied to other devices and systems.

Next, technical ideas that can be grasped from the above-described embodiment and other examples will be described below together with their effects.
(A) In any one of claims 1 to 5, the switching means switches the output port to PWM control, and when the processing of one cycle of the PWM control is completed, the output port is connected to the PWM control unit. The connection is returned to the software control unit, and the electrical component is operated by the software control. According to this configuration, it is possible to return the control of the output port from the PWM control to the original software control at an optimal timing.

  (B) In any one of claims 1 to 5 and the technical idea (A), the electrical component is a vehicle receiver that receives an ID signal transmitted from an electronic key in a vehicle, and the output port is A power supply port for supplying power to the vehicle receiver; and when the power supply port is switched to PWM control, the switching means supplies power to the vehicle receiver by a rise of a pulse output in the PWM control. The vehicle receiver is set in a reception standby state by ensuring the power supply waiting time of the vehicle receiver by starting and returning the connection of the power port to the software control unit after the power supply is stabilized. The ID signal can be received at.

  (C) In any one of claims 1 to 5 and technical ideas (a) and (b), the electrical component is a vehicle receiver that receives an ID signal transmitted from an electronic key in a vehicle, The periodic period is a polling period for periodically switching the vehicle receiver to the reception standby state. According to this configuration, the transmission radio wave is periodically monitored from the electronic key at a polling period, so that the ID signal can be received by the vehicle receiver whenever the ID signal is transmitted from the electronic key. .

  DESCRIPTION OF SYMBOLS 1 ... Vehicle, 2 ... Wireless key as electronic key, 4 ... Verification ECU as IC, 9 ... Vehicle receiver as electrical equipment, 11 ... Power supply port as output port, 19 ... Software control part, 22 ... PWM control , 23... Indicator as another electrical component, 24... Switching controller constituting switching means, 25... Switch part constituting switching means, Px... Power pulse as signal, Ts. Sid: Wireless signal as an ID signal.

Claims (5)

The software control unit inside the IC operates by repeatedly starting at a specific operation cycle, the software control unit operates at a high cycle during wake, and the software control unit operates at a low cycle during sleep, In an IC output port switching control device capable of operating an electrical component by outputting a signal from an output port at a periodic cycle determined from the operation cycle of the software control unit,
A PWM control unit for operating other electrical components by PWM control;
During the sleep, the connection of the output port from the software control unit to the PWM control unit is switched, and the output port is controlled by the PWM control unit, so that the electrical component can be operated by the PWM control. An IC output port switching control device comprising switching means. The output port is a power supply port that supplies power to the electrical component,
When the power supply port is switched to PWM control, the switching means starts supplying power to the electrical component at the rising edge of a pulse output by the PWM control, thereby ensuring a power supply stabilization wait time for the electrical component. The IC output port switching control device according to claim 1, wherein: 3. The IC output port switching control device according to claim 1, wherein the electrical component is a vehicle receiver that receives an ID signal transmitted from an electronic key in a vehicle. 4. The IC output port switching control according to claim 1, wherein one cycle of the PWM control is set to be longer than a cycle interval of the software control unit during the sleep. apparatus. 5. The IC output port switching control according to claim 1, wherein the duty ratio of the PWM control is set so as to take a power supply stabilization waiting time to be applied to the electrical component. apparatus.