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AN2549 Scheda tecnica(PDF) 8 Page - STMicroelectronics

Il numero della parte AN2549
Spiegazioni elettronici  Porting an application from the ST10F269Zx to the ST10F272Z2
PDF  33 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2549 Scheda tecnica(HTML) 8 Page - STMicroelectronics

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AN2549
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In the default configuration the sample time of the ST10F272Z2 is 2.5 times longer
compared to that of the ST10F269Zx. This has an impact on the frequency of the input
signal that can be applied to the ST10F272Z2.
1.4.2
Hardware impact: electrical characteristics
Table 6 lists the differences in the DC characteristics of the two devices.
Table 5.
ST10F272Z2 vs ST10F269Zx sample time comparison table
ADCTC
ADSTC
ST10F269Zx
Sample time
ST10F272Z2
Sample time
Ratio
F272Z2_time / F269_time
00
00
TCL * 48
TCL * 120
2.5
00
01
TCL * 96
TCL * 140
1.46
00
10
TCL * 192
TCL * 200
1.04
00
11
TCL * 384
TCL * 400
1.04
11
00
TCL * 96
TCL * 240
2.5
11
01
TCL * 192
TCL * 280
1.46
11
10
TCL * 384
TCL * 400
1.04
11
11
TCL * 768
TCL * 800
1.04
10
00
TCL * 192
TCL * 480
2.08
10
01
TCL * 384
TCL * 560
1.46
10
10
TCL * 768
TCL * 800
1.04
10
11
TCL * 1536
TCL * 1600
1.04
Table 6.
ADC differences
Symbol
Parameter
Limit values for ST10F269Zx
Limit values for ST10F272Z2
Unit
Min
Max
Min
Max
VAREF
Analog reference
voltage
4.0
VDD + 0.1
4.5
VDD
V
VAIN
Analog input voltage
VAGND
VAREF
VAGND
VAREF
V
CAIN
ADC input capacitance
(Port 5)
Not sampling
Sampling
-
-
10
15
-
-
CP1 + CP2 +CS
7
10.5
pF
tS
Sample time
48TCL
1536TCL
1µs
120TCL
1600TCL
tC
Conversion time
388TCL
2884TCL
388TCL
2884TCL
TUE
Total Unadjusted Error
(Port5)
-2.0
+2.0
-2.0
+2.0
LSB
RASRC
Internal resistance of
analog source
tS[ns]/150 -0.25
k
Ω



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