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BQ21061EVM: ship mode current on the BQ21061EVM board

Szhau Lai
Prodigy 50 points
Part Number: BQ21061EVM
Other Parts Discussed in Thread: EV2400

Hi 

I have question on the ship mode current. I get 7.5mA DC quiescent current in ship mode. Shouldn't it be 10nA?  

I am sure it is in ship mode by measuring PMID=0V. Please provide instructions how I should get down to 10nA on the EVM. 

Thanks for help

  • 0
    TI__Genius 12135 points

    Hi,

    This number seems very high for shipmode current. Can you please provide some details on your test set up? Namely shunt placement on EVM jumpers, BAT voltage, how shipmode was entered, and if the EV2400 or some other I2C debugger is connected.

    Best Regards,

    Juan Ospina

  • 0 in reply to Juan Ospina
    Prodigy 50 points

    Hi, 

    Sorry that I didn't see the reply so I create another post. Please delete the other one.  

    The setup is Vin disconnected, current meter is in series with battery connection. And I have connect the board to my MCU and the MCU can program the EVM through I2C. After programming the I2c, I press the MR button around 10s to let the EVM goes into ship mode. PMID is measured 0V. 

    Is my board damaged? I may have accidentally connect the battery port with reverse polarity. Or is there any configuration that I am not awared off?

    Best Regards

  • 0 in reply to Szhau Lai
    Prodigy 50 points

    By the way, the resistance measured from battery port is around 3.7kOhm, when no power is connected (Vin disconnected, Bat disconnected). Can you please measure your EVM board and let me know your resistance value?

  • +1 in reply to Szhau Lai
    TI__Genius 12135 points

    Hi,

    Shipmode can be entered directly by applying a battery voltage first without a VIN voltage. With VBAT=3.8V applied to the EVM, and no other load attached, the BAT pin should draw current on the order of nanoAmps. With the device outside of Shipmode and no additional load attached the EVM should draw about 30 uA of current.

    Resistance looking into BAT with no power supplied to the EVM is measured at around 2.1 MOhms. Unfortunately, as you mentioned measuring about 3.7kOhms, I believe this is indicative of a damaged IC.

    Best Regards,

    Juan Ospina