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| BQ4050 Datasheet, PDF (39/53 Pages) Texas Instruments – CEDV Gas Gauge and Protection Solution | |||
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www.ti.com
bq4050
SLUSC67A â MARCH 2016 â REVISED MARCH 2016
Figure 34. Thermistor Drive
8.2.2.3.5 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
8.2.2.3.6 Safety PTC Thermistor
The bq4050 device provides support for a safety PTC thermistor. The PTC thermistor is connected between PTC
and PTCEN, and PTCEN is connected to BAT. It can be placed close to the CHG/DSG FETs to monitor the
temperature. 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.
Copyright © 2016, Texas Instruments Incorporated
Product Folder Links: bq4050
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