參數(shù)資料
型號： TC815CBUTR
元件分類： ADC
英文描述： 1-CH DUAL-SLOPE ADC, PQFP64
封裝： PLASTIC, QFP-64
文件頁數(shù)： 26/26頁
文件大?。?/td> 575K
代理商： TC815CBUTR
2005 Microchip Technology Inc.
DS21474C-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 VI
(Pin 44) for full scale voltages from 200mV to 2000V.
For applications which do not require a 10m
Ω 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 REF AMP
10k
Ω
VCC
1.5k
S43
VCC
R18/24k
VCC
R19/5k
ANALOG
COM
29
REFHI
RMREFH
163.85mV
≈
0.1F
CREFH
51 CIF
0.01F
C6
R20/100k
Ω
To Digital
Section
S38 AZ
Comparator
Integrator
49
47
INT
0.01F
CINT
55
RVI
BUF
150
k
54
R
BUF
220
k
RBUF
S34
DE
S20 DE
S18 DE
S19 DE+
S16 DE+
S17 DE-
Buffer
S35
S37
INT+ +DC
C1/1F
0.22 F
ACVH
S15 AZ
4
3
2
1
39
38
37
36
35
31
50
R7/100k
Ω
R6/100k
Ω
R5/1.638M
Ω
R1/163.85
Ω
5
R4/163.85k
Ω
R3/16385
Ω
R2/1638.5
Ω
RMREFL
ΩR
0.01F
Ohms
Input
Current Input
R8/220
0.1F
(PTC)
D3
6.2V
200mA
D4
R15/9
20mA
R16/1
I 45
I
R12/1.11M
R11/101k
R10/10k
R9/1k
ACVL 46
R24
10k
R23
10k
Ω
R26
33k
Ω
R27/2k
Ω
Common
D2
C3
1F
C4
1F
V 44
I
VR2 41
VR3 40
VR4 43
VR2 42
ADO
ADI
Voltage
Input
R22
470
k
R21
2.2
M
R14/9.9M
Ω
R13/500k
Ω*
4.7F
Z1
S28
S27
S26
S25
S21 DE
S12 V 1/1
1/1k
1/100
1/10
1/1
+AC
INT( +DC)
S11
S13
AC-to-DC
Converter
Op Amp
V1/1
V1/10
V1/100
V1/1k
V1/10k
1/10 1/100 1/1k
1/10k
S32
S33
S31
S30
S29
1/1
CC
V
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 CREFH
32 CREFL
CAZ
+
53
S24
1/10k
CAZ
S44
HI
S14
S40
INT AC
LO
52
56
S22
C2
S39
1.5k
Ω
W
Ω
W
Ω
ΩΩ
Ω
ΩΩ
Ω
W
Ω
+
–
+
–
+
–
+
–
+
–
34
30
ΩRX
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