ST7L15 datasheet(88/138 Pages) STMICROELECTRONICS

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ST7L15, ST7L19

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ON-CHIP PERIPHERALS (cont’d)

11.5 10-BIT A/D CONVERTER (ADC)

11.5.1 Introduction

The on-chip Analog to Digital Converter (ADC) pe-

ripheral is a 10-bit, successive approximation con-

verter with internal sample and hold circuitry. This

peripheral has up to seven multiplexed analog in-

put channels (refer to device pinout description)

that allow the peripheral to convert the analog volt-

age levels from up to seven different sources.

The result of the conversion is stored in a 10-bit

Data Register. The A/D converter is controlled

through a Control/Status Register.

11.5.2 Main Features

■ 10-bit conversion

■ Up to 7 channels with multiplexed input

■ Linear successive approximation

■ Data register (DR) which contains the results

■ Conversion complete status flag

■ On/off bit (to reduce consumption)

The block diagram is shown in Figure 57.

11.5.3 Functional Description

11.5.3.1 Analog Power Supply

VDDA and VSSA are the high and low level refer-

ence voltage pins. In some devices (refer to device

pinout description) they are internally connected to

the VDD and VSS pins.

Conversion accuracy may therefore be impacted

by voltage drops and noise in the event of heavily

loaded or badly decoupled power supply lines.

Figure 57. ADC Block Diagram

CH2

CH1

EOC SPEED ADON

CH0

ADCCSR

AIN0

AIN1

ANALOG TO DIGITAL

CONVERTER

AIN6

ANALOG

MUX

ADCDRH

ADCDRL

AMP

SLOW

AMP

RADC

CADC

HOLD CONTROL

SEL

fADC

fCPU

DIV 2

DIV 4

SLOW

bit

CAL

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