• Not Answered

TCA6408A: Shutdown(stopped SDA/SLA) during writing to TCA6408A on I2C.

Part Number: TCA6408A

Hello,

 

Regarding to recovery on TCA6408A, my customer is asking some question.

They use power on reset for device reset. (RESET pin is connected to Vcci.)

 

When host is shutdown(SDA/SLA is stopped.) during writing to TCA6408A on I2C,

(Question)

(1) Will TCA6408A be hung-up on above condition?

(2) If so, they think that it can use the RESET pin (hardware) to recovery from hung-up.

As other solution, can it use I2C control (software) from host for recovery?

(3)About power sequence for power on reset

a) Keeping to input Vcci.

b) Vccp : ON -> OFF -> ON

Is above sequence correct for power on reset ?

 

They confirmed that after recovery from WDT(watched dog timer) in host(CPU) ,

TCA6408A is no response.

 

Regards,

Tao2199

1 Reply

  • Hello Tao,
    1) I don't think it should hang up under that condition.
    2) The part doesn't support a I2C reset via command.  Reset is either accomplished via nRESET pin or power cycle of Vccp.
    3) You can for a reset by turning off Vccp and then turning it back on. Yes, you can keep Vcci on while performing reset..
    -Francis Houde