
10-bit A/D converter (ADC) ST72321xx-Auto
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17 10-bit A/D converter (ADC)
17.1 Introduction
The on-chip Analog to Digital Converter (ADC) peripheral is a 10-bit, successive
approximation converter 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 a 10-bit data register. The A/D converter is
controlled through a control/status register.
17.2 Main features
● 10-bit conversion
● Up to 16 channels with multiplexed input
● Linear successive approximation
● Data register (DR) which contains the results
● Conversion complete status flag
● On/off bit (to reduce consumption)
The block diagram is shown in Figure 70.
Figure 70. ADC block diagram
CH2 CH1EOC SPEED ADON 0 CH0
ADCCSR
AIN0
AIN1
ANALOG TO DIGITAL
CONVERTER
AINx
ANALOG
MUX
D4 D3D5D9 D8 D7 D6 D2
ADCDRH
4
DIV 4
f
ADC
f
CPU
D1 D0
ADCDRL
0
1
00 0000
CH3
DIV 2
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