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ST7LITEUS2 Folha de dados(PDF) 80 Page - STMicroelectronics

Nome de Peças ST7LITEUS2
Descrição Electrónicos  Interrupt management
PDF  136 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7LITEUS2 Folha de dados(HTML) 80 Page - STMicroelectronics

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ST7LITEUS2, ST7LITEUS5
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Figure 36.
ADC block diagram
Digital A/D conversion result
The conversion is monotonic, meaning that the result never decreases if the analog input
does not and never increases if the analog input does not.
If the input voltage (VAIN) is greater than VDDA (high-level voltage reference) then the
conversion result is FFh in the ADCDRH register and 03h in the ADCDRL register (without
overflow indication).
If the input voltage (VAIN) is lower than VSSA (low-level voltage reference) then the
conversion result in the ADCDRH and ADCDRL registers is 00 00h.
The A/D converter is linear and the digital result of the conversion is stored in the ADCDRH
and ADCDRL registers. The accuracy of the conversion is described in the Electrical
Characteristics Section.
RAIN is the maximum recommended impedance for an analog input signal. If the impedance
is too high, this will result in a loss of accuracy due to leakage and sampling not being
completed in the alloted time.
A/D conversion phases
The A/D conversion is based on two conversion phases:
●
Sample capacitor loading [duration: tSAMPLE]
During this phase, the VAIN input voltage to be measured is loaded into the CADC
sample capacitor.
●
A/D conversion [duration: tHOLD]
During this phase, the A/D conversion is computed (8 successive approximations
CH2
CH1
EOC SPEED ADON
0
CH0
ADCCSR
AIN0
AIN1
ANALOG TO DIGITAL
CONVERTER
AINx
ANALOG
MUX
D4
D3
D5
D9
D8
D7
D6
D2
ADCDRH
3
D1
D0
ADCDRL
00
0
0
SLOW
0
0
RADC
CADC
HOLD CONTROL
fADC
fCPU
0
1
1
0
DIV 2
DIV 4
SLOW
bit
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