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NPM1100-CAAA-R Fiches technique(PDF) 41 Page - Nordic Semiconductor

No de pièce NPM1100-CAAA-R
Description  nPM1100
PDF  58 Pages
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Fabricant  NORDIC [Nordic Semiconductor]
Site Internet  https://www.nordicsemi.com/
Logo NORDIC - Nordic Semiconductor

NPM1100-CAAA-R Fiches technique(HTML) 41 Page - Nordic Semiconductor

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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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