參數(shù)資料
型號: ST72124J2T
廠商: 意法半導(dǎo)體
英文描述: 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES
中文描述: 8位單電壓閃存,ADC和16位定時器,SPI和脊髓損傷界面微控制器
文件頁數(shù): 97/153頁
文件大小: 1533K
代理商: ST72124J2T
ST72334J/N, ST72314J/N, ST72124J
97/153
14.6 8-BIT A/D CONVERTER (ADC)
14.6.1 Introduction
The on-chip Analog to Digital Converter (ADC) pe-
ripheral is a 8-bit, successive approximation con-
verter 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 8-bit
Data Register. The A/D converter is controlled
through a Control/Status Register.
14.6.2 Main Features
I
8-bit conversion
I
Up to 16 channels with multiplexed input
I
Linear successive approximation
I
Data register (DR) which contains the results
I
Conversion complete status flag
I
On/off bit (to reduce consumption)
The block diagram is shown in
Figure 51
.
14.6.3 Functional Description
14.6.3.1 Analog Power Supply
V
DDA
and V
SSA
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 V
DD
and V
SS
pins.
Conversion accuracy may therefore be impacted
by voltage drops and noise in the event of heavily
loaded or badly decoupled power supply lines.
See electrical characteristics section for more de-
tails.
Figure 51. ADC Block Diagram
CH2
CH1
CH3
COCO
0
ADON
0
CH0
ADCCSR
AIN0
AIN1
ANALOG TO DIGITAL
CONVERTER
AINx
ANALOG
MUX
R
ADC
C
ADC
D2
D1
D3
D7
D6
D5
D4
D0
ADCDR
4
DIV 2
f
ADC
f
CPU
HOLD CONTROL
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