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TCAN11623-Q1: Standby Mode Operation

Muwei Zheng
Intellectual 1570 points
Part Number: TCAN11623-Q1

Hi team,

Our customer is considering using TCAN11623-Q1 in low power mode while MCU keeps powered. Would you check their question below about the Standby Mode in TCAN11623-Q1?

- From Figure 10-5. TCAN11623 State Machine in the datasheet, it seems if we assert nSLP to low in Normal Mode, the device will enter Standby ⇒ Sleep Mode eventually. Is there any method to keep the device at Standby Mode?

Thank you,

Muwei Zheng

  • 0
    TI__Genius 15345 points

    Hey Muwei,

    That is not the intention of the low power mode on the TCAN1162. The idea behind this behavior is that if the CAN device goes into sleep mode the entire MCU would power down along with every other device on the LDO rail. Then when the TCAN1162 receives a WUP on the CAN bus it will go into standby mode and power on the MCU. The device is not meant to wait indefinitely in standby mode since it cannot send or receive data. In standby mode the device is only powering it's low power receiver which is simply waiting for a WUP.

    This is especially important in the automotive use case where certain parts of the car do not need to be powered and can be completely turned off until they are needed.

    Why does the customer want to power the MCU during low power mode?

    Best,

    Chris

  • 0 in reply to Chris Ayoub
    TI__Intellectual 1570 points

    Hi Chris,

    Thank you. 

    Customer is going to use this device with BLE IC. It may be waked up trough BLE, so they want the TCAN11623 to keep in standby mode instead of sleep mode.

  • 0 in reply to Muwei Zheng
    TI__Genius 15345 points

    Hi Muwei,

    You can achieve this affect if you use the WAKE pin on the TCAN1162. The VIH of the wake pin on this device is 4V. Depending on the capabilities of your BLE IC, once it receives a Bluetooth signal it can send a signal to the WAKE pin of the TCAN1162 which will bring the device out of sleep mode and into standby mode. This would then turn on the LDO powering your MCU. 

    Best,

    Chris