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Original question:

TDA4VM: Power Consumption of TDA4VM in Different Power Modes, and Port Map of TDA4VM for the different I/O Interfaces

TDA4VM: Possible ways to Keep TDA4VM keep alive when the Key Switch is OFF

Jyoti Kulkarni
Prodigy 20 points
Part Number: TDA4VM

As per one of the Client Requirements to wakeup the ECU, 

  • The Real Time Clock asserts an output that starts the main supply  --> Is this possible to keep MCU energized when Key Switch is Off , If suppose the RTC have the capability to have an alarm function to wake up the ECU. The ECU shall awaken based on this alarm when key switch is off.
    • If yes how this will be routed to TDA4VM ? Please provide Pin/Port map

  • Buss activity on the RS-232 port determined by the DCD line  -->  How this would be possible, is there be a Pin mapping when ECU is wakeup by ( I2c/CAN signal ?)
  • 0
    TI__Mastermind 19980 points

    Jyoti,

    I think this is a system-level question. The SoC does not directly respond to the Key Switch. 
    In a real system, I assume that this Key Switch is a signal with which you power down the system...

    TDA4VM is NOT optimized for low power modes, and so it could make sense to delay the turn-off of the SoC, but it is probably not likely that you would want to keep the SoC power indefinitely.

    Kevin