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Part Number: TPS65381A-Q1
I use TPS65381A-Q1 with RM46L852 microcontroller, In the begin, I use IGN to switch on TPS65381A-Q1 and set [IGN_PWRL] bit with 1 , so if the IGN pin go low, the MCU will not be power down.
My question is if I send [WR_CAN_STBY] SPI command throgh SPI line to TPS, will the TPS65381A-Q1 go to standby status?
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In reply to Krishnamurthy Hegde:
thank your kind response.
So it seemed the only way to let TPS go to Standby status is :
let Watchdog do some error response to TPS -> TPS go to reset status -> TPS go to diagnoist status -> clear IGN_PWRL bit -> TPS go to standby status
isn't it ?
Is there any simple method ( e.g. one or two steps) to let TPS go to standby status ?
In reply to user5102395:
the last summary is correct. There are 2 wake up sources. If either of them remains HIGH you cannot go to STANDBY state. IGN is normally for automotive ignintion and is reverse protected to -7V and has a longer deglitch for higher noise immunity. The other is CANWU which is normally used with the INH pin of a 14 pin CAN XCVR but has only negative protection to -0.3V, but CANWU is automatically latched on wake up request. Either one can be used to wake up the device, but for latched wake up CANWU has less constraints to then shut the device off: CANWU pin must be low level and then send WR_CAN_STBY command, even if WR_CAN_STBY is sent and the CANWU pin (or IGN pin) is high the device will not go to STANDBY but immediately re-power up through RESET to DIAGNOSTIC state. The WR_CAN_STBY command as outlined above is only for use with wake up from CANWU pin. Using IGN pin with IGN_PWRL is more complicated.
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