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| BQ40Z50-R2 Datasheet, PDF (37/51 Pages) Texas Instruments – 1-Series, 2-Series, 3-Series, and 4-Series Li-Ion Battery Pack Manager | |||
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www.ti.com
bq40z50-R2
SLUSCS4 â JUNE 2017
Figure 34. Thermistor Drive
9.2.2.3.5 LEDs
Three LED control outputs provide constant current sinks for the driving external LEDs. These outputs are
configured to provide voltage and control for up to 5 LEDs. No external bias voltage is required. Unused
LEDCNTL pins can remain open or they can be connected to VSS. The DISP pin should be connected to VSS, if
the LED feature is not used.
Figure 35. LEDs
9.2.2.3.6 Safety PTC Thermistor
The bq40z50-R2 device provides support for a safety PTC thermistor. The PTC thermistor is connected between
the PTC and BAT pins. It can be placed close to the CHG/DSG FETs to monitor the temperature. The PTC pin
monitors the voltage at the pin and will trip if the thermistor resistance exceeds the defined threshold. A PTC fault
is one of the permanent failure modes. It can only be cleared by a POR.
To disable, connect PTC and PTCEN to VSS.
Figure 36. PTC Thermistor
Copyright © 2017, Texas Instruments Incorporated
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