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TCAN1144-Q1: TCAN114x-Q1 SPI CMD wakeup issue

Mingkang Song
Expert 3320 points
Part Number: TCAN1144-Q1

Sleep mode cannot enter standby mode while testing TCAN114X-Q1. The yellow portion of the picture confirms that it is indeed 1

The power-up sequence is VSUO 14V VIO 5V wake through 1K resistor to ground, other registers are temporarily default.
Sleep-stanby is configured to communicate over SPI as follows:
1.FS_CNTR_EN disable
2. HD_RST W1C
3.INT_1 INT_2 INT_3 all clear
4. MODE_SEL toggled to 100b = Standby
After the above operation, the reply is always A001 by reading MODE_CNTRL

How does it enter stanby mode? Thanks!

  • 0
    TI__Guru 53555 points

    Hi Mingkang,

    What is the status of the INT_1 - 3 registers after the write to mode control is complete? 

    Are you able to monitor the state of the INH pin? This pin will remain high as long as the device is not in sleep mode. If this pin goes low (high-z) we can confirm that the transceiver is in sleep mode.

    Have you been able to verify that SPI communication is working correctly in the current test setup? I would recommend using the scratchpad register to confirm that the MCU and correct read and write to the transceiver. 

    Have any other transceiver function been verified? Or is this the first test being done with this device? 

    Regards,
    Eric Schott