HT85F2270 datasheet(153/226 Pages) HOLTEK

153 / 226 page

Rev. 1.00

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

30 Analog to Digital Converter – ADC

The devices include a multi-channel 12-bit fully integrated Analog to Digital Converter or ADC.

A range of programmable features allow flexible and fast analog to digital conversion for a wide

range of input signals.

A/D Overview

The Analog to Digital Converter contains a range of features which include:

■

Multiplexed Multi-channel Inputs

■

Programmable Gain Amplifier

■

Temperature Sensor Input

■

Internal Voltage Reference Source

■

External Reference Voltage Input

■

Programmable Clock Speed

■

A/D Converter Interrupt

All functions are controlled using dedicated ADC control registers for setup and dynamic control.

The following block diagram shows the overall structure of the converter together with its relative

control bits.

A/D Converter

P4.0/AIN.0

A/D Reference Voltage

ADRL

ADRH

A/D Data

Registers

START

EOCB

ADRFS

VSS

Internal Voltage Reference

ADCK2~ADCK0

fSYS

ACE7~ACE0

ACS3~ACS0

ADGN2~ADGN0

ACS4

Temperature Sensor

A/D Clock

VCCA3

VREF

ADOFF

MUX

VREFAS

VREFIS

TSEN

÷2N

(N=0~6)

P4.1/AIN.1

P4.7/AIN.7

PGA

A/D Converter Structure

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