User manual

Introduction

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18.1 Introduction

The battery monitor is a small block automatically enabled at boot which monitors both the VDDS supply

voltage and the temperature through an on-chip temperature sensor.

The battery monitor provides voltage and temperature information to several modules, including the flash

and the radio, to ensure correct operation and lowest power consumption. It is thus not recommended to

modify any settings in the battery monitor or turn if off.

18.2 Functional Description

The battery monitor is a 6-bit ADC running at 32 kHz that performs alternate measurements of the supply

voltage and the temperature sensor. A small digital core transforms these measurements to voltage and

temperature in °C, which are read directly from the [BAT] and [TEMP] registers.

The module also includes two registers, [BATUPD] and [TEMPUPD], used to monitor changes in voltage

and temperature, respectively. The registers are connected to the AON event fabric. See Chapter 4,

Interrupts and Events for details. The [BATUPD] and [TEMPUPD] registers must be cleared manually, and

assert only when there is an updated value for either the supply voltage or temperature.

18.3 BATMON Registers

1312

Battery Monitor and Temperature Sensor SWCU117A–February 2015–Revised March 2015

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