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BQ24193 regulates battery at 3.74

The part worked OK in standalone mode when first assembled on the prototype. In host mode it regulates the battery at 3.74V, drawing current from the 10V power supply to meet the loading. Setting Reg04 Charge Voltage Control, and reading to verify, has no effect. Powering up the circuit without going into host mode, it lets the battery discharge. The CE pin is held low. Do I have a bad part?

  • The Fault register REG09 was 0x05, reporting the battery temperature code 101 "cold". The charging was suspended, but REG09[5:4] was 00, so I assumed "cold" was not a fault that prevented any battery charging. It did. The problem was the dummy 10k for the thermistor was across the wrong resistor in the temperature input circuit. My question is to clarify, does any non-zero bit in the Fault register REG09 stop charging, even if REG09[5:4] = 00?
  • Fault in REG09[5:0] can potentially stop charging due to safety. This includes CHRG_FAULT, BATOVP, or NTC fault.