BQ40Z60_16 Datasheet, PDF (27/47 Pages) Texas Instruments – Programmable Battery Management Unit

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bq40z60
SLUSAW3C – DECEMBER 2014 – REVISED JULY 2015
Feature Description (continued)
9.3.6 LED Display
The bq40z60 can drive a 4-segment LED display for remaining capacity indication and/or a permanent fail (PF)
error code indication.
9.3.7 Internal Temperature Sensor
An internal temperature sensor is available on the bq40z60 to reduce the cost, power, and size of the external
components necessary to measure temperature. It is available for connection to the ADC using the multiplexer,
and is ideal for determining pack temperature during storage and IC temperature during normal operation.
9.3.8 External Temperature Sensor Support
Each of the TSx input pins can be enabled with an 18-kΩ (Typ.) linearization pullup resistor to support using a 10
kΩ (25°C) NTC external thermistor, such as the Semitec 103AT–2. One or more thermistors can be connected
between VSS and the individual RCx pin. The analog measurement is then taken via the ADC through its input
multiplexer. If a different thermistor type is required, then changes to the external support components may be
required.
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Figure 7. Thermistor Pin Configuration
9.3.9 High Frequency Oscillator
The bq40z60 includes a high frequency oscillator (HFO) running at 16.78 MHz. It is synthesized from the LFO
output and scaled down to 8.388 MHz with 50% duty cycle. There is no need for external oscillator components.
9.3.10 Communications
The bq40z60 uses SMBus v1.1 with MASTER mode and packet error checking (PEC) options per the SBS
specification.
9.3.10.1 SMBus On and Off State
The bq40z60 detects an SMBus off state when SMBC and SMBD are low for two or more seconds. Clearing this
state requires that either SMBC or SMBD transition high. The communication bus will resume activity within
1 ms.
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