BQ26231_15 Datasheet, PDF (5/23 Pages) Texas Instruments – EMBEDDED PORTABLE APPLICATIONS

Not Recommended for New Designs
bq26231
SLUS491 – JULY 2001
detailed description
SR1–SR2 current sense inputs
The bq26231 interprets charge and discharge activity by monitoring and integrating the voltage drop V_(SR)
across pins SR1 and SR2. The SR1 input connects to the sense resistor and the negative terminal of the battery.
The SR2 input connects to the sense resistor and the negative terminal of the pack. V_(SR1) < V_(SR2) indicates
discharge, and V_(SR1) > V_(SR2) indicates charge. The effective voltage drop, V_(SRO), as seen by the bq26231,
is V_(SR) +V_(OS). Valid input range is ±200 mV. A 100 kΩ series resistor is recommended to protect these inputs
in case of a shorted battery.
HDQ data input/output
This bidirectional input/output communicates the register information to the host system. HDQ is open drain and
requires a pullup/pulldown resistor in the battery pack to disable/enable sleep mode if the pack is removed from
the system.
RBI register backup input
This input maintains the internal register states during periods when V_CC is below the minimum operating
voltage.
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