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AN2556 Datasheet(PDF) 10 Page - STMicroelectronics

Part # AN2556
Description  Porting an application from the ST10F269Zx to the ST10F273Z4
PDF  35 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2556 Datasheet(HTML) 10 Page - STMicroelectronics

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Modified features
AN2556
10/35
1.4.1
Hardware/software impacts: conversion timing control
The A/D Converter is not fully compatible with the ST10F269Zx (timing and programming
model). In the ST10F269Zx, the sample time (for loading the capacitors) and the conversion
time is programmable and can be adjusted to the external circuitry. The total conversion time
is compatible with the formula used for the ST10F269Zx, but the meaning of the field bits
ADCTC and ADSTC are no longer compatible
The user should take care of the sample time parameter: This is the time where the
capacitances of the converter are loaded via the respective analog input pin. Table 5:
ST10F273Z4 vs. ST10F269Zx sample time comparison table shows the differences in
sample time.
Table 4.
ST10F273Z4 conversion timing table
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
Table 5.
ST10F273Z4 vs. ST10F269Zx sample time comparison table
ADCTC
ADSTC
ST10F269Zx
sample time
ST10F273Z4
sample time
Ratio
F273Z4_time /
F269_time
ADCTC
00
00
TCL * 48
TCL * 120
2.5
00
00
01
TCL * 96
TCL * 140
1.46
00
00
10
TCL * 192
TCL * 200
1.04
00
00
11
TCL * 384
TCL * 400
1.04
00
11
00
TCL * 96
TCL * 240
2.5
11
11
01
TCL * 192
TCL * 280
1.46
11
11
10
TCL * 384
TCL * 400
1.04
11
11
11
TCL * 768
TCL * 800
1.04
11
10
00
TCL * 192
TCL * 480
2.08
10
10
01
TCL * 384
TCL * 560
1.46
10



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