TCAN1144-Q1: Question of TCAN1145-Q1

Dear Team,

 Sorry for Typo, is  TCAN1145 , Thanks!

Jimmy

Hi Jimmy,

It sounds like the SWE timer is expiring after tINACTIVE (~5 minutes). This timer will start in normal mode when there is no activity detected on the CAN bus for tSILENCE (~1 sec), causing the CANSLNT interrupt to be set. This interrupt flag will need to be cleared in order to reset the SWE timer and prevent the device from going to sleep mode.

Does this sound consistent with what the customer is observing?

Regards,
Eric Schott

Hi Eric,

Thanks for your great support! Yes, you are right!

Could you guide us how to clear this interrupt flag in order to reset the SWE timer and prevent the device from going to sleep mode.

Thanks a lot!

Jimmy

Hi Jimmy,

The CANSLNT flag is bit 10 of the Interrupt register ('h0820). The bit can be cleared by writing a 1 to it. This will need to be done every time the bit is set from the tSILENCE timeout, which will be indicated via the nINT pin when the flag is set. Alternatively, the SWE timer can be disabled entirely using bit 1 of the Mode Control Register ('h0800). This bit will maintain its configuration through sleep mode, but will be reset during a power-on reset. 

If you are using the drivers from the demo code (found on the device store page), clearing an interrupt can be done using the TCAN4x5x_Device_ClearInterrupts() for specific interrupts or TCAN4x5x_Device_ClearInterruptsAll() to clear all interrupts. 

Regards,
Eric Schott

Hi Eric,

Our customer tried to complete the initialization and every frame (300ms),

Write 0xff to 0x51 0x52 0x53 of TCAN1145,

Clear the interrupt flag, But the situation is still the same.

It seems we did something wrong? Could you guide us how to check this issue.

Thanks a lot!

Jimmy

Hi Eric,

We resolve this problem, we wrote 0x84 in the position of 0x1C to turn off SWE,

Thanks a lot!!

Jimmy