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| 型號： | DATASHEET |
| 英文描述： | ST10F168 - 16-BIT MCU - 8KB RAM - 256KB FLASH MEMORY - 111 I/O - 1 CAN 2.0B INTERFACE |
| 中文描述： | ST10F168 - 16位MCU - 8KB的內(nèi)存- 256KB的快閃記憶體- 111的I / O - 1 CAN 2.0B總線接口 |
| 文件頁數(shù)： | 53/74頁 |
| 文件大?。?/td> | 897K |
| 代理商： | DATASHEET |
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ST10F168
53/74
6. During the conversion the ADC’s capacitance must be repeatedly charged or discharged. The internal resistance of the reference
voltage source must allow the capacitance to reach its respective voltage level within t
CC
. The maximum internal resistance results
from the programmed conversion timing.
7. Partially tested, guaranteed by design characterization.
8. To remove noise and undesirable high frequency components from the analog input signal, a low-pass filter must be connected at
the ADC input. The cut-off frequency of this filter must be twice the highest conversion frequency used in the application as described
in the formula:
f
cut-off
= 2 / t
c app
where t
c app
is the shorter conversion time used in the application, calculated with the following formula:
t
c app
= 14 t
CC
+ t
S
+ 4 TCL (= 14 t
CC
+ 2 t
SC
+ 4 TCL).
ADC Sample time and conversion time are programmable. The table below should be used to calculate
the above timings.
20.5 - AC Characteristics
20.5.1 - Test Waveforms
Figure 16 :
Input / output waveforms
Conversion Time
Sample Time
ADCON.15|14 (ADCTC)
Conversion clock t
CC
ADCON.13|12 (ADSTC)
Sample clock t
SC
00
TCL x 24
00
t
CC
01
Reserved, do not use
01
t
CC
x 2
t
CC
x 4
t
CC
x 8
10
TCL x 96
10
11
TCL x 48
11
Figure 17 :
Float waveforms
2.4V
0.45V
Test Points
0.2V
DD
+0.9
0.2V
DD
+0.9
0.2V
DD
-0.1
0.2V
DD
-0.1
AC inputs during testing are driven at 2.4V for a logic ‘1’ and 0.4V for a logic ‘0’.
Timing measurements are made at V
IH
min for a logic ‘1’ and V
IL
max for a logic ‘0’.
Timing
Reference
Points
V
Load
+0.1V
V
Load
-0.1V
V
OH
-0.1V
V
OL
+0.1V
V
Load
V
OL
V
OH
For timing purposes a port pin is no longer floating when V
LOAD
changes of ±100mV.
It begins to float when a 100mV change from the loaded V
OH
/V
OL
level occurs (I
OH
/I
OL
= 20mA).
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