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TC818 Datasheet(PDF) 9 Page - Microchip Technology

Part # TC818
Description  Auto-Ranging Analog-to-Digital Converter with 3-1/2 Digit Display
PDF  24 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC818 Datasheet(HTML) 9 Page - Microchip Technology

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© 2002 Microchip Technology Inc.
DS21475B-page 9
TC818A
FIGURE 3-2:
RATIOMETRIC RESISTANCE MEASUREMENT FUNCTIONAL DIAGRAM
FIGURE 3-3:
RESISTANCE MEASUREMENT ACCURACY SET BY EXTERNAL
STANDARD RESISTOR
Buffer
TC818A
R6/100k
Ω
32
S19
DE
S20
VCC -2.6V
1.5k
Ω
VCC
Low Ohms
HI
Ohms
VA
S29
S30
S31
S32
S33
÷1
÷10
÷100
÷1k
÷10k
S28
S27
S26
S25
S24
DE
S23
Voltage
Reference
39
38
37
36
35
Integrator
Comparator
S37
S35
55
54
R
ΩBUF
S12
S13
DE
S18
S21
DE
INT • (
+ DC)
33
CREF
0.1µF
R7/100k
Ω
31
Analog
Common
29
34
28
10k
57
VSS
9V
R18
24k
Ω
5k
Ω
REFHI
220k
49
0.1µF
150k
Ω
RVIBUF
47
CINT
0.1µF
S36
S34
RX
Unknown
R8
220
Ω
(PTC)
V •
1
1
R5/1638500
R4/163850
R3/16385
R2/1638.5
R1/163.85
Ω
Ω
DE +
Ω
• LO
CAZ
≈ VCC -2.8V
VCC
+
~
1.5k
Ω
~
•
•
•
DE
•
•
•
50
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
+
–
Example: 200k
Ω Full Scale Measurement
VR
163.85k
Ω
163.85
220
RX
++
-------------------------------------------------

 x0.64
=
(a )
(b)
VX
RX
163.85k
Ω 220Ω RX
++
--------------------------------------------------------------

 x0.64
=
(c) “Ramp Up Voltage” = “Ramp Down Voltage”
VX
R
ICI
()
----------------xT
I
VX
R
ICI
()
----------------T
DE
=
.
..
Where:
RI = Integrating Resistor, TI = Integrate Time
CI = Integrating Capacitor, TDE = De-integrate Time
(d)
RX = 163.85
TI
(TDE)
Independent of RI,CI or Internal Voltage Reference
163.85k
Ω
CREF
220
RX
Unknown
To Analog Buffer
100k
Ω
VA =
0.64V for Ohms
0.32V for LO Ohms
+
Ω
RS
VR
VX



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