JAJSSD2A October 2023 – December 2023 BQ25638
PRODUCTION DATA
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The device has the TS_BIAS pin to isolate the battery temperature sensing thermistor and associated resistor-divider from REGN. The 103AT-2 thermistor with typical resistor-divider network requires about 400 μA to bias. The charger provides TS_BIAS pin, which is internally connected to the REGN LDO via a back-to-back MOSFET. When no temperature measurement is being taken, the switch is disabled to disconnect the thermistor and resistor-divider from the REGN LDO, saving the 400 μA bias current from being expended unnecessarily. Additionally, if TS_IGNORE = 1, TS_BIAS pin gets disconnected from REGN.
The TS_BIAS pin has short-circuit protection. If a short is detected on the TS_BIAS pin, the switch will be disabled to to disconnect the short from REGN. If this condition occurs, TS_STAT is set to 111. Charging and OTG modes are suspended until the short is removed.