参数资料
型号: ST72622L2T1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44
封装: TQFP-44
文件页数: 123/134页
文件大小: 815K
代理商: ST72622L2T1
ST7262
89/134
10.7 10-BIT A/D CONVERTER (ADC)
10.7.1 Introduction
The on-chip Analog to Digital Converter (ADC) pe-
ripheral is a 10-bit, successive approximation con-
verter with internal sample and hold circuitry. This
peripheral has up to 8 multiplexed analog input
channels (refer to device pin out description) that
allow the peripheral to convert the analog voltage
levels from up to 8 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.
10.7.2 Main Features
s
10-bit conversion
s
Up to 8 channels with multiplexed input
s
Linear successive approximation
s
Data register (DR) which contains the results
s
Conversion complete status flag
s
Continuous or One-Shot mode
s
On/off bit (to reduce consumption)
The block diagram is shown in Figure 1.
10.7.3 Functional Description
10.7.3.1 Analog Power Supply
VDDA and VSSA are the high and low level refer-
ence voltage pins. In some devices (refer to device
pin out description) they are internally connected
to the VDD and VSS pins.
Conversion accuracy may therefore be impacted
by voltage drops and noise in the event of heavily
loaded or badly decoupled power supply lines.
Figure 47. ADC Block Diagram
CS2
CS1
EOC SPEED ADON
ITE
CS0
ADCCSR
AIN0
AIN1
ANALOG TO DIGITAL
CONVERTER
AINx
ANALOG
MUX
D4
D3
D5
D9
D8
D7
D6
D2
ADCDRMSB
3
DIV 2
fADC
fCPU
D1
D0
ADCDRLSB
DIV 4
0
1
EOC Interrupt
0
0000
ONE
SHOT
1
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