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Original question:

BQ2980: Shutdown function of CTR-Pin

BQ2980: How to enable dsg if CTR can not be used.

jan stappers
Prodigy 150 points
Part Number: BQ2980

Tool/software:

Dear,

We will use the BQ298009, but we do not want to use the CTR functionality. I understand that we can tie the CTR pin to ground, this should keep it on.

But how can we turn on the discharge and charge mosfets after a battery is inserted (and no charger is present)? What will happen in the case of a battery that is empty (2.5V), does it automatically start charging with CTR being low? Or will it require a reset?

We cannot give a pulse on CTR with the microcontroller, because it isn't getting power as long as the DSG mosfet is off.

Best regards,

Jan

  • +1
    TI__Expert 4320 points

    Hello,

    After a battery is inserted (VBAT > VUVP) and VPACK detecting a charger connection are required to enter NORMAL mode. However, shorting BAT+ to PACK+ will also turn on the device as long as the VBAT>VUVP condition is met. If the battery is at 2.5V undervoltage protection will trigger. The only way to recover from undervoltage protection is from the following:

    CTR is an active high pin used for control of disabling the FETS. If this pin is tied low it will have no effect on the FETs.

    Best regards,
    Thomas Rainey