T89C5115-RATIM datasheet(80/105 Pages) ATMEL

Part #	T89C5115-RATIM

Description	Low Pin Count 8-bit MCU with A/D Converter and 16-Kbytes of Flash Memory

PDF	105 Pages

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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80 / 105 page

T89C5115

4128A–8051–04/02

Table 54. Selected Analog Input

Voltage Conversion

When the ADCIN is equals to VAREF the ADC converts the signal to 3FFh (full scale). If

the input voltage equals VAGND, the ADC converts it to 000h. Input voltage between

VAREF and VAGND are a straight-line linear conversion. All other voltages will result in

3FFh if greater than VAREF and 000h if less than VAGND.

Note that ADCIN should not exceed VAREF absolute maximum range! (see section

“AC-DC”)

Clock Selection

The ADC clock is the same as CPU.

The maximum clock frequency for ADC is 700 KHz. A prescaler is featured (ADCCLK)

to generate the ADC clock from the oscillator frequency.

Figure 38. A/D Converter Clock

ADC Standby Mode

When the ADC is not used, it is possible to set it in standby mode by clearing bit ADEN

in ADCON register. In this mode its power dissipation is about 1 uW.

SCH2

SCH1

SCH0

Selected Analog input

000

AN0

001

AN1

010

AN2

011

AN3

100

AN4

101

AN5

110

AN6

111

AN7

Prescaler ADCLK

A/D

Converter

ADC Clock

CPU

CLOCK

CPU Core Clock Symbol

÷ 2

T89C5115-RATIM Datasheet(PDF) 80 Page - ATMEL Corporation

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