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參數(shù)資料
| 型號： | TC815 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 3-1/2 Digit Auto-Ranging A/D Converter with Triplex LCD Drive and Display Hold Function |
| 中文描述： | 3-1/2數(shù)字自動測距的A / D三層液晶顯示驅動器和轉換器保持功能 |
| 文件頁數(shù)： | 9/26頁 |
| 文件大?。?/td> | 595K |
| 代理商： | TC815 |
2002 Microchip Technology Inc.
DS21474B-page 9
TC815
3.4
Voltage Measurement
Resistive dividers are automatically changed to provide
in range readings for 200mV to 2000V full scale readings
(Figure 3-3). The input resistance is set by external
resistors R14/R13. The divider leg resistors are R9-R12.
The divider leg resistors give a 200mV signal V
I
(Pin 44) for full scale voltages from 200mV to 2000V.
For applications which do not require a 10m
input
impedance, the divider network impedances may be
lowered. This will reduce voltage offset errors induced
by switch leakage currents.
FIGURE 3-3:
TC815 ANALOG SECTION
TC815
+
–
2.8V
+
10k
V
CC
1.5k
S43
V
CC
R18/24k
V
CC
R19/5k
ANALOG
COM
34
29
REFHI
RM
REFH
163.85mV
≈
0.1μF
C
REFH
51 CIF
0.01μF
C6
R20/100k
To Digital
Section
S38 AZ
Comparator
Integrator
49
C
AZ
47
0.01μF
C
INT
0.01μF
C
AZ
55
RVI
BUF
150
k
54
R
220
k
RBUF
RBUF
S34
DE
S20 DE
S18 DE
S19 DE+
S16 DE+
S17 DE-
Buffer
S35
S37
INT+ +DC
C1/1μF
0.22 μF
ACVH
S15 AZ
4
3
2
1
39
38
37
36
35
31
50
R7/100k
R6/100k
R5/1.638M
R1/163.85
5
R4/163.85k
R3/16385
R2/1638.5
RM
REFL
R
R
R
R
R
0.01μF
Ohms
Input
Current Input
R8/220
0.1μF
(PTC)
D3
6.2V
200mA
R16/1
D4
R15/9
20mA
II
R12/1.11M
R11/101k
R10/10k
R9/1k
ACVL 46
R24
10k
R23
10k
R26
33k
R27/2k
Common
D2
C3
1μF
C4
1μF
VI
V
R2
41
V
R3
40
V
R4
43
V
R2
42
ADO
ADI
Voltage
Input
R22
470
k
W
R21
2.2
M
R14/9.9M
R13/500k
*
4.7μF
Z1
S28
S27
S26
S25
S21 DE
S12 V
1/1
1/1k
1/
1/
1/1
+AC
INT
( +DC)
S11
S13
AC-to-DC
Converter
Op Amp
V
1/1
V
1/10
V
1/100
V
1/1k
V
1/10k
1/
1/
S32
S33
S31
S30
S29
1/1
V
CC
S10
+ 1
S6
S7
S8 S9
S1
S2
S3
S4
S5
*Not required when
Resistor Network is used.
INT
AC
V
1/10
V
1/100
V
1/1
k
V
1/10k
D1
DE
33 C
REFH
32 C
REFL
+
+
53
S24
1/10k
S44
HI
S14
S40
INT
AC
52
56
S22
S22
C2
S39
1.5k
W
W
–
+
–
+
–
+
–
+
–
30
R
X
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