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TCAN1145-Q1: SPI read/write issue.

Basil baby
Prodigy 150 points
Part Number: TCAN1145-Q1


Hi, 

We are trying to read the register value from TCAN1145 transceiver. But we are getting 0xF0 for all registers. We are configured the clock for 2MHz, and Mode 0 is selected.

Please guide us to resolve this.

  • 0
    TI__Guru 74322 points

    Basil,

    Thanks for bringing this to E2E. From your description it sounds like your SPI is configured correctly, but can you share waveforms of all 4 SPI lines while a transaction is taking place? There may be some timing issues happening with the SCLK and/or nCS pin.

    Regards,

    Eric Hackett

  • 0 in reply to Eric Hackett
    Prodigy 150 points

    Hi Eric, 

    Thank you for your support. The SPI read is success now. It was an issue with the SPI configuration in MC side. 

    Actual Address Given Address Global Interrupt Value  Register Value
    0x00  0x00 0xF0 0x54
    0x01 0x02 0xF0 0x43
    0x02 0x04 0xF0 0x41
    0x03 0x06 0xF0 0x4E
    0x04 0x08 0xF0 0x31
    0x05 0x0A 0xF0 0x31
    0x06 0x0C 0xF0 0x34
    0x07 0x0E 0xF0 0x35

    But we have one doubt, when we are reading MODE_CNTRL Register, we are getting MODE_SEL as sleep mode. Is this expected? As per datasheet, the mode after power on is standby.

    Actual Address Given Address Global Interrupt Value  Register Value
    0x10 0x20 0xF0 0x01
  • +1 in reply to Basil baby
    TI__Guru 53575 points

    Hi Basil,

    The TCAN1145 does indeed start up into standby mode after initial power up on Vsup. When this happens, the internal SWE timer also starts. If this ~4 minute timer expires then the device will automatically move into Sleep mode to save system power. Is it possible that the the timeframe of your testing is long enough for this to occur?

    Regards, 
    Eric Schott 

  • 0 in reply to Eric Schott1
    Prodigy 150 points

    Hi Eric,

    Thank you for the response. We are in the initial stage, and we just tried to test the communication only. As you suggested, if we read the mode control register with in 4 minutes from boot, it returns standby only. Thank you so much.