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AN2169 Datasheet(PDF) 10 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) 10 Page - STMicroelectronics

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Modified features
AN2169
10/33
1.5
A/D converter
The Analog Digital converter has been re-designed between the ST10F168 and ST10F276.
The ST10F276 still provides an Analog / Digital Converter with 10-bit resolution and a sample &
hold circuit on-chip.
1.5.1
Hardware / Software impact: conversion timing control
The A/D converter is not fully compatible versus ST10F168 (timing and programming model).
As for the ST10F168, the sample time ( for loading the capacitors) and the conversion time are
programmable and can be adjusted to the external circuitry. The total conversion time is
compatible with the formula used for ST10F168, while the meaning of the bit fields ADCTC and
ADSTC is no longer compatible.
Table 3.
ST10F276 Conversion timing table
1.5.2
Hardware impact
Table 4.
ADC differences
ADCTC
ADSTC
Sample
Comparison
Extra
Total Conversion
00
00
TCL * 120
TCL * 240
TCL * 28
TCL * 388
00
01
TCL * 140
TCL * 280
TCL * 16
TCL * 436
00
10
TCL * 200
TCL * 280
TCL * 52
TCL * 532
00
11
TCL * 400
TCL * 280
TCL * 44
TCL * 724
11
00
TCL * 240
TCL * 120
TCL * 52
TCL * 772
11
01
TCL * 280
TCL * 560
TCL * 28
TCL * 868
11
10
TCL * 400
TCL * 560
TCL * 100
TCL * 1060
11
11
TCL * 800
TCL * 560
TCL * 52
TCL * 1444
10
00
TCL * 480
TCL * 960
TCL * 100
TCL * 1540
10
01
TCL * 560
TCL * 1120
TCL * 52
TCL * 1732
10
10
TCL * 800
TCL * 1120
TCL * 196
TCL * 2116
10
11
TCL * 1600
TCL * 1120
TCL * 164
TCL * 2884
Parameter
Symbol
Limit values for
ST10F168
Limit values for ST10F276
Unit
min.
max.
min.
max.
Analog Reference
voltage
VAREF
4.0
VDD + 0.1
4.5
VDD + 0.1
V
Reference supply
current
running mode
power-down mode
IAREF
-
-
-
-
5000
1
µA



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