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AN2169 Datasheet(PDF) 11 Page - STMicroelectronics

Part # AN2169
Description  Porting an application from the ST10F168 to the ST10F276
PDF  33 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2169 Datasheet(HTML) 11 Page - STMicroelectronics

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AN2169
Modified features
11/33
1.5.3
Software impact
Self-calibration and ADC initialization routine
An automatic self-calibration adjusts the ADC module to process parameter variations at each
reset event. After reset, the busy flag (read-only) ADBSY is set because the self-calibration is
ongoing. The duration of self-calibration depends on the CPU clock: it takes up to 40.629 ± 1
clock pulses. The user shall poll this bit to know when the self-calibration is done and then
initialize the ADC module.
This self-calibration is seen by the ST10F276 as a conversion and thus bit ADCIR is set. The
software should perform a dummy read of the ADDAT register and clear the ADCIR and
ADCEIR flag before configuring the ADC module and starting the first conversion.
New bit ADOFF, bit 6 of ADCON register
ADCON (FFA0h / A0h)
SFR
Reset Value: 0000h
ADC Input capacitance
Not sampling P5
Sampling P5
Not sampling P1
Sampling P1
CAIN
-
-
-
-
33
33
-
-
-
-
-
-
CP1 + CP2 +CS
7
10.5
9
12.5
pF
Sample time
tS
48 TCL
1536 TCL
120 TCL
1600 TCL
us
Total Unadjusted Error
Port5
Port1 - No overload
Port1 - Overload
TUE
-2.0
+2.0
-2.0
-5.0
+7.0
+2.0
+5.0
+7.0
LSB
Differential Nonlinearity
DNL
-1
+1
LSB
Integral Nonlinearity
INL
-1.5
+1.5
LSB
Offset Error
OFS
-1.5
+1.5
LSB
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
ADCTC
ADSTC
ADCTC
ADCIN
ADWR
ADBSY
ADST
ADOFF
ADM
ADCH
RW
RW
RW
RW
RW
RW
RW
R
RW
RW
RW
RW
RW
RW
RW
RW
Bit
Function
Comment
6
ADOFF: ADC Disable
0: Analog circuitry of A/D converter is on
1: Analog circuitry of A/D converter is turned off (no
consumption)
New bit only for the ST10F276.
Reserved for the ST10F168.
Parameter
Symbol
Limit values for
ST10F168
Limit values for ST10F276
Unit
min.
max.
min.
max.



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