NPM1100-CAAA-R7 datasheet(41/58 Pages) NORDIC

No. de pieza	NPM1100-CAAA-R7

Descripción Electrónicos	nPM1100

PDF	58 Pages

Scroll/Zoom	100%

Fabricante Electrónico	NORDIC [Nordic Semiconductor]

Página de inicio	https://www.nordicsemi.com/

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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

NPM1100-CAAA-R7 Datasheet(PDF) 41 Page - Nordic Semiconductor