ST72652 查看數據表（PDF） - STMicroelectronics

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ST72652

LOW-POWER, FULL-SPEED USB 8-BIT MCU WITH 32K FLASH, 5K RAM, FLASH CARD I/F, TIMER, PWM, ADC, I2C, SPI

STMicroelectronics 

ST7265x

11.8 8-BIT A/D CONVERTER (ADC)

11.8.1 Introduction

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

ripheral is a 8-bit, successive approximation con-

verter with internal sample and hold circuitry. This

peripheral has up to 16 multiplexed analog input

channels (refer to device pin out description) that

allow the peripheral to convert the analog voltage

levels from up to 16 different sources.

The result of the conversion is stored in a 8-bit

Data Register. The A/D converter is controlled

through a Control/Status Register.

11.8.2 Main Features

s 8-bit conversion

s Up to 16 channels with multiplexed input

s Linear successive approximation

s Data register (DR) which contains the results

s Conversion complete status flag

s On/off bit (to reduce consumption)

The block diagram is shown in Figure 70.

Figure 70. ADC Block Diagram

11.8.3 Functional Description

11.8.3.1 Analog Power Supply

VDDA and VSSA are the high and low level refer-

ence voltage pins. In some devices (refer to device

pin out 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.

See electrical characteristics section for more de-

tails.

fCPU

DIV 4

fADC

COCO 0 ADON 0 CH3 CH2 CH1 CH0 ADCCSR

4

AIN0

HOLD CONTROL

AIN1

RADC

ANALOG

MUX

ANALOG TO DIGITAL

CONVERTER

AINx

CADC

ADCDR D7 D6 D5 D4 D3 D2 D1 D0

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