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TC7106ACPL 数据表(PDF) 18 Page - Microchip Technology

部件名 TC7106ACPL
功能描述  3-1/2 Digit Analog-to-Digital Converters
PDF  26 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

TC7106ACPL 数据表(HTML) 18 Page - Microchip Technology

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TC7106/A/TC7107/A
DS21455B-page 18
© 2002 Microchip Technology Inc.
10.4
Ratiometric Resistance
Measurements
The true differential input and differential reference
make ratiometric reading possible. Typically in a ratio-
metric operation, an unknown resistance is measured,
with respect to a known standard resistance. No accu-
rately defined reference voltage is needed.
The unknown resistance is put in series with a known
standard and a current passed through the pair. The
voltage developed across the unknown is applied to the
input and the voltage across the known resistor is
applied to the reference input. If the unknown equals
the standard, the display will read 1000.
The displayed reading can be determined from the
following expression:
The display will over range for:
RUNKNOWN ≥ 2xRSTANDARD
FIGURE 10-2:
LOW PARTS COUNT
RATIOMETRIC
RESISTANCE
MEASUREMENT
FIGURE 10-3:
TEMPERATURE SENSOR
FIGURE 10-4:
POSITIVE TEMPERATURE
COEFFICIENT RESISTOR
TEMPERATURE SENSOR
FIGURE 10-5:
TC7106A, USING THE
INTERNAL REFERENCE:
200mV FULL SCALE, 3
READINGS-PER-SECOND
(RPS)
Displayed Reading
()
RUnknown
RS
dard
tan
-------------------------------x1000
=
VREF+
VREF-
VIN+
VIN-
Analog
Common
TC7106A
LCD Display
RSTANDARD
RUNKNOWN
V+
V+
V-
VIN-
VIN+
VREF+
VREF-
Common
50k
Ω
R2
160k
Ω
300k
Ω
300k
Ω
R1
50k
Ω
1N4148
Sensor
9V
+
TC7106A
VFS = 2V
TC7106A
V+
V-
VIN-
VIN+
VREF+
VREF-
Common
5.6k
Ω
160k
Ω
R2
20k
Ω
1N914
9V
R1
20k
Ω
+
R3
0.7%/
°C
PTC
100k
Ω
100pF
0.47
µF
47k
Ω
0.22
µF
To Display
To Backplane
0.1
µF
21
1k
Ω
22k
Ω
9V
Set VREF = 100mV
TC7106A
0.01
µF
+
IN
1M
Ω
–
To Pin 1
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
+
–



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