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TCAN1145-Q1: INH wake-up confirmation

Ethan Liu
Intellectual 985 points
Part Number: TCAN1145-Q1

Tool/software:

Hi team,

For the internal design of the chip, after TCAN1145-Q1 performs an effective INH wake-up of the downstream power supply, is there an internal flag that can be identified? Can this flag be read through SPI interface?

Ethan

  • 0
    TI__Guru 73052 points

    Ethan,

    INH will go high any time the device is not in sleep mode, so either the mode of the device can be verified or the interrupt registers contain CAN wake-up interrupts that will be indicated externally by the nINT pin, as well can be checked if the interrupt registers are read. Please reference the datasheet SPI registers section for more details.

    Regards,

    Eric Hackett 

  • 0 in reply to Eric Hackett
    TI__Intellectual 985 points

    Hi Eric,

    My purpose is not to confirm whether the INH wake-up function of TCAN1145-Q1 is enabled, but to confirm whether the EN enable of the subsequent chip is enabled through CAN_INH. The corresponding reading of the CAN working mode should not be able to identify this requirement; this function can correspond to the register flag CW set to 1 after the INH wake-up is effective in NXP-TJA1145. I want to confirm whether TCAN1145 has this function?

    At the same time, the CAN bus wake-up interrupt in the INT register read through SPI does not correspond to the INH wake-up function, but the wake-up of the BWRR function;

    Best regards!

    Ethan Liu

  • 0 in reply to Ethan Liu
    TI__Guru 52025 points

    Hi Ethan,

    The INH signal is an output for the TCAN1145 and will be driven to battery-level when the transceiver is in any active state and will be high-z when the transceiver is in sleep mode. The INH signal does not detect any wake condition, but may be used to indicate to the system and enable other ICs when a wake event does occur. 

    Valid wake events for the TCAN1145 include wake via the CAN bus which includes partial networking (CANINT), wake via the WAKE pin (LWU), wake from a POR condition (PWRON). For each of these wake conditions the device will set the corresponding interrupt register field. 

    Are these the register fields you are looking for the confirm the wake up of TCAN1145? 

    Regards, 
    Eric Schott