BLUENRG-1 datasheet(27/173 Pages) STMICROELECTRONICS

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BlueNRG-1

Functional details

DocID028866 Rev 1

27/173

Bit

Field name

Reset

Description

31:1

RESERVED

0x0

RESERVED

3.6

ADC

3.6.1

Introduction

The BlueNRG-1 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



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 7: Block diagram of ADC

Several channels are available for conversion, the CHSEL selects the channel according to

Table 22: ADC channels

CHSEL

Channels description

All switch open. No input

Single ended through ADC2 pin. InP = Vbias (internal), InN = ADC2 pin

Single ended through ADC1 pin. InP = ADC1 pin, InN = Vbias (internal)

Differential ADC1 pin

– ADC2 pin. InP = ADC1 pin, InN = ADC2 pin

Battery level detector. InN = BLD, InP = 0.6 V (internal)

Short. InP = InN = 0.6 V (internal)

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