EM6517 datasheet(33/64 Pages) EMMICRO

33 / 64 page

EM6517

03/02 REV. C/448

 2002, EM Microelectronic-Marin SA

www.emmicroelectronic.com

10 2-Channel ADC (8-bit digital converter)

The EM6517 contains one 8-bit ADC with 2 independent input channels. In addition one can choose also Vref

and Vgnd as ADC input. The control logic uses an internal analogue multiplexor to select the channel to be

converted. When data conversion is complete, indicated by a DATA VALID signal, the control logic saves the

converted value in the RegADCDataH and the Shadow Low registers. RegADCDataL registers is updated

when reading the RegADCDataH register. At the end of conversion an interrupt IRQADC is sent to the

µP. The

architecture of the ADC is illustrated in Figure 25.

The ADC 8 bit contains

an inherent sample and

hold function : the input

voltage is sampled during

acquisition

phase

clock cycles) and is held

until

the

end

conversion.

Total

conversion time is 10

clock cycles.

Figure 25. ADC 8 Bit Architecture

8-BIT CHARGE

REDISTRIBUTION

ADC CORE

4-Bit Internal Data Bus

RdHigh

IRQ

RdLow

RegADCDataL

RdLow

Shadow Low

RegADCDataH

RdHigh

SVref1/2Sel Start

Convert

Channel

select

Vgnd

VrefInt

Vref1

Vref2

Vref

Vin

Convert

Data[7 :1]

Data Valid

AIN

BIN

VDD

Vgnd

VDD

VSS

IRQADC

Ck[16]

Control

Logic

External

Figure 26. ADC 8 Bit Timing

Start Convert

ADC Clock

Data Valid

Re-sampling

8 clocks conversion

Sample&Hold

IRQADC

EM6517 Datasheet(PDF) 33 Page - EM Microelectronic - MARIN SA

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