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AN2021 データシート(PDF) 12 Page - STMicroelectronics

部品番号 AN2021
部品情報  The ST10F272B and ST10F272E are members of the STMicroelectronics
PDF  39 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2021 データシート(HTML) 12 Page - STMicroelectronics

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Modified features
AN2021
12/39
1.4
A/D converter
In the ST10F272, the analog/digital converter has been redesigned (compared to the A/D
converter in the ST10F269). The ST10F272 still provides an analog/digital converter with
10-bit resolution and an on-chip sample and hold circuit.
1.4.1
Hardware / Software impact: conversion timing control
The A/D converter in the ST10F272 is not fully compatible with that of the ST10F269 (timing
and programming model).
In the ST10F269, the sample time (to charge 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 ST10F269, whereas the meanings of the ADCTC and
ADSTC bit fields are no longer compatible.
The user should take care of the Sample time parameter: This is the time during which the
capacitances of the converter are charged via the respective analog input pins. Table 5
shows the differences in sample time.
Table 4.
ST10F272 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



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