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Original question:

BQ25172: TS pin as Enable/Disable

BQ25176J: Using TC for Enable/Disable

Mike Kolb
Prodigy 20 points

Part Number: BQ25176J
Other Parts Discussed in Thread: BQ25171-Q1

Hi, I'm looking at using a BQ25176J to replace a soon to be obsolete single cell Li-ion charger which has an Enable pin.  It looks like I could use the TC pin on the BQ25176J as an Enable/Disable, but holding voltage at TC between 188mV and 610mV to keep the battery charging current at the desired level looks problematic.  It looks like I would have to use a Hi-Z / Active Low output to drive the pulldown resistor to make this work.  Is there a recommended circuit that can do this?  Thanks.

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    TI__Mastermind 33570 points

    Hi Mike, 

    Thank you for reaching out via E2E. Please see my comments below. 

    You are correct that the BQ25176J does not have a dedicated charge enable pin and using TS pin is recommended way to have enable/disable control. If you do not plan to connect an NTC to TS pin for battery temperature monitoring you can simply connect a 10kohm resistor from TS to GND for normal operation and then in parallel connect TS pin to a GPIO pin on MCU for enable/disable control. The GPIO will need to be high impedance for floating condition when charge is enabled. 

    Alternatively, allow me to point out we have another part from the same family, the BQ25171-Q1, which has a dedicated charge enable pin. 

    Best Regards,

    Garrett