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BQ40Z50-R1 数据表(PDF) 39 Page - Texas Instruments |
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BQ40Z50-R1 数据表(HTML) 39 Page - Texas Instruments |
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39 / 55 page  bq40z50-R1 www.ti.com SLUSCB3 – 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 Ω resistor between PTC and VSS. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 39 Product Folder Links: bq40z50-R1 |
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