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TCAN1043A-Q1: TCAN1043 IC Operation

Mayur Isame
Prodigy 40 points
Part Number: TCAN1043A-Q1

Tool/software:

Q1. I wish to design a power management system for the below schematic which is little modified from the schematic in the datasheet. The difference is that i dont want to control EN and nSTB from MCU. Therefore i have pulled it to Vout (of Regulator) which is itself connected to Vout.

Now i ideally wanted the IC to initially be in SLEEP Mode, so that when Wakeup is received, IC could go into STANDBY which would make INH high which would then trigger the EN of regulator. Thus VCC, VIO, EN and nSTB becomes HIGH and system goes into NORMAL mode.

But the problem I am facing is that we know when IC is powered on, it goes first into STANDBY mode (which makes INH high) which breaks the above process.

Kindly suggest a solution for the above system requirement.

  • 0
    TI__Mastermind 28530 points

    Hi Mayur,

    Unfortunately, standby mode cannot be bypassed, entering sleep mode directly when powered-on is not possible on this device.

    In the process above, after the device enter normal mode, how would it transition to other modes? Since nSTB and EN are always pulled high, the device would not be able to realize mode transition by controlling those pins. Also, since the regulator EN pin is triggered by INH, there will be no way to turn off VIO and VCC because INH will only be off in sleep mode. The device will be stuck in normal mode until you turn off VBAT.

    Is there any other reason for not controlling nSTB and EN pins? Please let me know so we can figure out if another solution would be possible.

    Regards,

    Sean