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TS3A4751: Deep sleep power draw

Mike Rankin
Prodigy 45 points
Part Number: TS3A4751

Tool/software:

I am assembling and testing deep sleep power consumption of a new design. Switch TS3A4751RGYR below is used to isolate power and uart data when the micro is in deep sleep mode. Before this circuit was added, deep sleep measured 297uA. When this circuit is populated current draw measures 585uA. Is there anything obvious I can change to keep the sleep current down like grounding U1 pin10 (COM4) or is this draw normal?

  • 0
    TI__Mastermind 35168 points

    Hi Mike,

    When you say 'this circuit' do you refer to the mux alone or is there something else that is added when you compare the 297uA vs the 585uA? I mostly ask because the TS3A4751 should only draw in the hundreds of nA of supply current so that's definitely a lot more than expected. 

    When you're in deep sleep mode is the mux also powered down or do you retain the 3.3V on it?

    Thanks,
    Rami

  • 0 in reply to Rami Mooti1
    Prodigy 45 points

    The processor and rest of the circuit before the TS3A4751 and other bits shown in the image drew 297uA. After populating them deep sleep now measures 585uA. Pin2 of U1 is always +3.3V and I expected only a few uA current draw because it is off in deep sleep. Thank you and it sounds like this is the way it is.