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参数资料
| 型号： | TC8129CKW |
| 元件分类： | ADC |
| 英文描述： | 1-CH PROPRIETARY METHOD ADC, PQFP44 |
| 封装： | PLASTIC, QFP-44 |
| 文件页数： | 6/17页 |
| 文件大小： | 137K |
| 代理商： | TC8129CKW |
14
TC8129
4C\VDigit Auto-Ranging DMM ADC
TC8129 - 3/29/96-2
2001 Microchip Technology Inc.
DS21473A
40
D55
0
Bit#
Function
Name
Typical Data
Hexidecimal
Value
Calculation: DATA1
DATA 2
DATA3
DATA4
DATA5
(+18A)
(–03)
(+187)
(+11)
(–10)
(+13)
3E8
64
16
+
–
+
–
5F758
6A4
A0
13
5F001
389121
16
10
+
–
+
=
*
=
39
D54
1
38
D53
0
37
DATA5
D52
0
3
36
D51
1
35
D50
1
34
S5
1
+
33
D45
0
32
D44
1
31
D43
0
30
DATA4
D42
0
29
D41
0
28
D40
0
27
S4
0
–
26
D35
0
25
D34
1
24
D33
0
23
DATA3
D32
0
1
22
D31
0
21
D30
1
20
S3
1
+
19
D25
0
18
D24
0
17
D23
0
16
DATA2
D22
0
15
D21
1
3
14
D20
1
13
S2
0
–
12
D19
0
11
D18
1
10
D17
1
9
D16
0
8
D15
0
7
DATA1
D14
0
6
D13
1
5
D12
0
A
4
D11
1
3
D10
0
2
S1
1
+
1
T
0
OR
0
Figure 10. Calculating the Conversion Result
Oscillator
The TC8129 normally operates with a 32.768kHz clock,
which produces a conversion rate of (20 conversions/sec).
A typical oscillator is circuit is shown in Figure 12.
OSC1
OSC2
43
44
30 pF
330k
32.768 kHz
TC8129
V+
Figure 12. Clock Oscillator
COMPONENT SELECTION
Integrate Resistor (RINT)
A 100k
resistor is recommended for RINT. This will
limit integrator output current to about 4
A at full scale.
Integrate Capacitor (CINT)
The normal value for CINT is 0.047F. This value,
combined with an integrate resistor of 100k
and clock
frequency of 32.768kHz, will produce an integrator swing
of about 1.5V at full scale. To reduce rollover errors, a
capacitor with low dielectric absorption is required. A
polypropylene capacitor is recommended for best perfor-
mance, but polycarbonate, polyphenylene sulfide, or poly-
styrene capacitors can be used in less demanding applica-
tions.
3.
Subtract DATA3.
4.
Multiply by 6416.
5.
Add DATA4.
6.
Multiply by 0A16.
7.
Subtract DATA5.
BUZIN (Pin 31)
The buzzer can be used for a variety of user-interface
features, such as audible continuity or signaling of range
changes. The buzzer will turn on when BUZIN is set HIGH.
APPLICATIONS
Power
The TC8129 is designed to operate from a single 9
Volt battery. The converter also provides a common mode
reference point for analog measurements, power for the
TC8131 controller, and power for the frequency counter
buffer. The TC8129 internal power supply schematic is
shown in Figure 11.
+
–
TC8129
9V
3.2V
3V
4.5V
DGND2
DGND1
Analog
Common
VS
+
–
Figure 11. TC8129 Internal Power Supply,
Simplified Block Diagram
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