P27/29

Rev. M, May 2010

ML5012

8.

Summary of A/D Converter operations

Typical operation procedure of A/D converter is summarized as below The bit represented by [X] is user settable.

8-1. General procedure of using A/D conversion mode

The procedure below is to use the A/D converter in the A/D conversion mode. Steps below are to convert

the analog voltage between input channel CHA1 and CHB1 in differential input mode to digital value at

PGA gain = 0dB with A/D Output Range from -2,047 to 2,047, and VREF = (VR – AGND)/2

Operation

Setting

1

Start-up oscillator

ENOSC = 1

2

Set A/D Output Range : -2,047 to 2,047

AD_Range = 1

3

Set VREF = (VR – AGND)/2

VMID_EN = 1

4

Select differential analog input CHA1 and CHB1

CHAB_SEL[2:0] = ‘000’ and

CHB_SEL[2:0] = ‘000’

5

Set PGA Gain = 0 dB

PGA_Gain Register = ‘0000 0000’

6

Specify operation mode and start A/D converter

A/D Configuration Register = ‘1010’

This procedure starts the A/D converter. When A/D conversion time has elapsed, the A/D converter stops

and stores the result in A/D register A/D[11:0]. End of the operation can be verified by reading bits S/S

or EN that should be ‘0’.