topic Re: TJ1145 Sleep in In Vehicle Networking

TJ1145 Sleep

Leethika — Wed, 23 Apr 2025 10:10:38 GMT

Hi Team,

We are using TJA1145A, we have made the transceiver into normal/active mode and transceiver is able to send and receive messages.

But when we are trying to make it into sleep mode I can see transceiver going to Standby mode.

I have made(CWE=1) and in frame control register the standard id has been set to 7FF with mask 0 and DLC is also made 0.

Any another configuration is needed in order to make the transceiver into sleep mode.

Thanks and regards

Leethika

Re: TJ1145 Sleep

TomasVaverka — Thu, 24 Apr 2025 07:37:57 GMT

Hi Leethika,

Perhaps the Sleep mode entering is protected due to wake-up event is not enabled and/or pending events are not cleared. For more information, please see chapters 3.2.4 and 5.3.2 of the AH1903 (Secure file requiring the NDA).

BRs, Tomas

Re: TJ1145 Sleep

Leethika — Fri, 25 Apr 2025 07:13:21 GMT

Hi Tomas,

I have cleared all the event flags before entering the sleep mode (System event status register, Transceiver event status register, WAKE pin event status register) by writing 1, before sending the sleep mode command through SPI.

The sequence I have followed is,

1.Making CAN wake up enable by writing 1 at CWE.

2.Disabling WPRE, WPFE.

3.Clearing event flags.

writing 1 at all event registers mentioned above

4. sending sleep command by writing 0x01 at CMC.

What might be wrong in the above sequence?

Thanks

Leethika