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BQ40Z50-R2 数据表(PDF) 39 Page - Texas Instruments |
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BQ40Z50-R2 数据表(HTML) 39 Page - Texas Instruments |
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39 / 55 page ![]() Figure 9-14. 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 five 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 9-15. 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 9-16. PTC Thermistor www.ti.com BQ40Z50-R2 SLUSCS4C – JUNE 2017 – REVISED APRIL 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 39 Product Folder Links: BQ40Z50-R2 |
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