ST7MC1K2TC datasheet(235/308 Pages) STMICROELECTRONICS

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10.8 10-BIT A/D CONVERTER (ADC)

10.8.1 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 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 2 8-bit

Data Registers. The A/D converter is controlled

through a Control/Status Register.

10.8.2 Main Features

■ 10-bit conversion

■ Up to 16 channels with multiplexed input

■ 2 software-selectable sample times

■ External positive reference voltage VREF+ can

be independent from supply

■ Linear successive approximation

■ Data registers (DR) which contain the results

■ Conversion complete status flag

■ Maskable interrupt

■ On/off bit (to reduce consumption)

The block diagram is shown in Figure 127.

10.8.3 Functional Description

10.8.3.1 Analog References

VREF+ and VREF- are the high and low level refer-

ence voltage pins. Conversion accuracy may

therefore be impacted by voltage drops and noise

on these lines. VREF+ can be supplied by an inter-

mediate supply between VDDA and VSSA to

change the conversion voltage range. VREF- must

be tied to VSSA. An internal resistor bridge is im-

plemented between VREF+ and VREF- pins, with a

typical value of 15kΩ

10.8.3.2 Analog Power Supply

VDDA and VSSA are the supply and ground pins

providing power to the converter part. They must

be tied to VDD and VSS respectively.

Figure 127. ADC Block Diagram

CS2

CS1

EOC PRSC1PRSC0 ADON

CS0

ADCCSR

AIN0

AIN1

ANALOG TO DIGITAL

CONVERTER

AINx

ANALOG

MUX

ADCDRMSB

fADC

ADCDRLSB

PRESCALER

CS3

MCCBCR

request

ADCIE

ADSTS

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