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NPM1100-CAAA-R Datasheet(PDF) 41 Page - Nordic Semiconductor |
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NPM1100-CAAA-R Datasheet(HTML) 41 Page - Nordic Semiconductor |
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41 / 58 page  Application 7.8 Battery monitoring and low battery indication The battery monitoring circuit allows the battery voltage to be sampled by the nRF5x ADC. The transistors enable battery voltage sensing through a resistive divider. When not sampling, the transistors prevent current leakage to ground. The circuit is designed to ensure the voltage range on an analog input pin over the battery voltage is within the limits required by the nRF5x GPIO and ADC. A battery voltage of 2.8 V to 4.2 V is scaled down to 360 mV to 540 mV at P0.xx for sampling. If software on nRF5x determines that the battery on nPM1100 is low, the Low Bat LED can be switched on via GPIO. This circuit sources the LED current from VSYS. VSYS will not be supplied after VBAT drops below VBATBOR because CHARGER will isolate the battery when a brownout reset occurs. See Power-on reset (POR) and brownout reset (BOR) on page 10. 4445_367 v1.0 41 |
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