TC815
TABLE 2-1: PIN FUNCTION TABLE (CONTINUED)
Pin Number
(64-Pin Plastic)
Quad Flat Package
Symbol
Description
35
ΩR1
Standard resistor connection for 200Ω full scale.
36
ΩR2
Standard resistor connection for 2000Ω full scale.
37
ΩR3
Standard resistor connection for 20kΩ full scale range.
38
ΩR4
Standard resistor connection for 200kΩ full scale range.
39
ΩR5
Standard resistor connection for 2000kΩ full scale range.
40
VR3
Voltage measurement ÷ 100 attenuator.
41
VR2
Voltage measurement ÷ 10 attenuator.
42
VR5
Voltage measurement ÷ 10,000 attenuator.
43
VR4
Voltage measurement ÷ 1000 attenuator.
44
VI
Unknown voltage input ÷ 1 attenuator.
45
II
Unknown current input.
46
ACVL
Low output of AC to DC converter.
47
CI
Integrator capacitor connection. Nominally 0.1µf. (Low dielectric absorption. Polypropylene
dielectrics suggested.)
48
NC
No connection.
49
CAZ
Auto-zero capacitor connection; nominally 0.1µf.
50
RX
Unknown resistance input.
51
CFI
Input filter connection.
52
AD1
Negative input of internal AC to DC operational amplifier.
53
AD0
Output of internal AC to DC operational amplifier.
54
RΩBUF Active buffer output for resistance measurement. Integration resistor connection. Integrator
resistor nominally 220kΩ.
55
RVIBUF Active buffer output for voltage and current measurement. Integration resistor connection.
Integration resistor nominally 150kΩ.
56
ACVH Positive output of AC to DC converter.
57
VSSA
Negative supply connection for analog circuits. Connect to negative terminal of 9V battery.
58
DGND
Internal logic digital ground. The logic “0” level. Nominally 4.7V below VCC.
59
RANGE Input to set manual operation and change ranges.
60
HOLD Input to hold display. Connect to DIG GND.
61
-MEM
Input to enter Memory Measurement mode for relative measurements. The two LSD’s are
stored and subtracted from future measurements.
62
DS/AC Input that selects AC or DC option during voltage/current measurements. For resistance
Ω/LOWΩ measurements, Ω/LOWΩ, the ohms or low power (voltage) ohms option can be selected.
63
I
Input to select current measurement. Set to logic “0” (Digital ground) for
current measurement
64
NC
No connection.
DS21474B-page 6
© 2002 Microchip Technology Inc.