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| BQ40Z50-R1 Datasheet, PDF (39/55 Pages) Texas Instruments – Li-Ion Battery Pack Manager | |||
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www.ti.com
bq40z50-R1
SLUSCB3 â JULY 2015
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-R1 device provides support for a safety PTC thermistor. The PTC thermistor is connected between
the PTC pin and VSS. It can be placed close to the CHG/DSG FETs to monitor the temperature. The PTC pin
outputs a very small current, typical ~370 nA, and the PTC fault will be triggered at ~0.7 V typical. A PTC fault is
one of the permanent failure modes. It can only be cleared by a POR.
To disable this feature, connect a 10-k⦠resistor between PTC and VSS.
Copyright © 2015, Texas Instruments Incorporated
Product Folder Links: bq40z50-R1
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