參數(shù)資料
型號: ST72C104G2M7
英文描述: 1GB DDR3 SDRAM SODIMM
中文描述: 8位單電壓閃存微控制器。 ADC的。 16位定時器。的SPI。
文件頁數(shù): 126/140頁
文件大?。?/td> 1349K
代理商: ST72C104G2M7
ST72104G, ST72215G, ST72216G, ST72254G
86/140
12.5 8-BIT A/D CONVERTER (ADC)
12.5.1 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.
12.5.2 Main Features
s
8-bit conversion
s
Up to 16 channels with multiplexed input
s
Linear successive approximation
s
Data register (DR) which contains the results
s
Conversion complete status flag
s
On/off bit (to reduce consumption)
The block diagram is shown in Figure 1.
12.5.3 Functional Description
12.5.3.1 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.
See electrical characteristics section for more de-
tails.
Figure 47. ADC Block Diagram
CH2
CH1
CH3
COCO
0
ADON
0
CH0
ADCCSR
AIN0
AIN1
ANALOG TO DIGITAL
CONVERTER
AINx
ANALOG
MUX
RADC
CADC
D2
D1
D3
D7
D6
D5
D4
D0
ADCDR
4
DIV 2
fADC
fCPU
HOLD CONTROL
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