BLUENRG-2 datasheet(31/190 Pages) STMICROELECTRONICS

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BlueNRG-2

Functional details

DocID030675 Rev 2

31/190

Table 26: CKGEN_BLE - CLK32K_IT register description: address offset

CKGEN_BLE_BASE_ADDR+0x18

Bit

Field name

Reset

Description

CLK32K_MEAS_IRQ

0x0

When read, provides the status of the

interrupt indicating slow lock measurement

is finished:

0: No pending interrupt.

1: Pending interrupt.

When written, clears the interrupt:

0: No effect.

1: Clear the interrupt.

31:1

RESERVED

0x0

RESERVED

3.6

ADC

3.6.1

Introduction

The BlueNRG-2 integrates a 10-bit Analog-to-Digital Converter (ADC) for sampling an

external signal.

Main features are:



Sampling frequency 1 MHz



One channel in single ended or differential input through the pins ADC1 and ADC2



Temperature and battery level conversion



The conversion are either continuous or single step acquisition



An integrated digital filter is used to process a PDM data stream from a MEMS

microphone

3.6.2

Functional overview

The figure below shows a top diagram of the ADC.

Figure 10: ADC block diagram

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