TC7129(2002) View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
TC7129
(Rev.:2002)
(Rev.:2002)
Microchip Technology
TC7129 Datasheet PDF : 24 Pages
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TC7129
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1: PIN FUNCTION TABLE
Pin No.
Pin No.
Pin No.
40-Pin PDIP 44-Pin PQFP 44-Pin PLCC
Symbol
Function
1
40
2
41
3
42
4
43
5
44
6
1
7
2
8
3
9
4
10
5
11
7
12
8
13
9
14
10
15
11
16
12
17
13
18
14
19
15
20
16
21
18
22
19
23
20
24
21
25
22
26
23
27
24
28
25
29
26
30
27
31
29
32
30
33
31
34
32
35
33
2
OSC1
Input to first clock inverter.
3
OSC3
Output of second clock inverter.
4
ANNUNCIATOR Backplane square wave output for driving annunciators.
5
B1, C1, CONT Output to display segments.
6
A1, G1, D1 Output to display segments.
7
F1, E1, DP1 Output to display segments.
8
B2, C2, LO BATT Output to display segments.
9
A2, G2, D2 Output to display segments.
10
F2, E2, DP2 Output to display segments.
11
B3, C3, MINUS Output to display segments.
13
A3, G3, D3 Output to display segments.
14
F3, E3, DP3 Output to display segments.
15
B4, C4, BC5 Output to display segments.
16
A4, D4, G4 Output to display segments.
17
F4, E4, DP4 Output to display segments.
18
BP3
Backplane #3 output to display.
19
BP2
Backplane #2 output to display.
20
BP1
Backplane #1 output to display.
21
VDISP
Negative rail for display drivers.
22
DP4/OR
Input: When HI, turns on most significant decimal point.
Output: Pulled HI when result count exceeds ±19,999.
24
DP3/UR
Input: Second most significant decimal point on when HI.
Output: Pulled HI when result count is less than ±1000.
25
LATCH/HOLD Input: When floating, ADC operates in the Free Run mode. When
pulled HI, the last displayed reading is held. When pulled LO, the
result counter contents are shown incrementing during the
de-integrate phase of cycle.
Output: Negative going edge occurs when the data latches are
updated. Can be used for converter status signal.
26
V-
Negative power supply terminal.
27
V+
Positive power supply terminal and positive rail for display drivers.
28
INT IN
Input to integrator amplifier.
29
INT OUT Output of integrator amplifier.
30
CONTINUITY Input: When LO, continuity flag on the display is OFF. When HI,
continuity flag is ON.
Output: HI when voltage between inputs is less than +200mV. LO
when voltage between inputs is more than +200mV.
31
COMMON Sets Common mode voltage of 3.2V below V+ for DE, 10X, etc.
Can be used as pre-regulator for external reference.
32
CREF+
Positive side of external reference capacitor.
33
CREF-
Negative side of external reference capacitor.
35
BUFFER Output of buffer amplifier.
36
IN LO
Negative input voltage terminal.
37
IN HI
Positive input voltage terminal.
38
REF HI
Positive reference voltage.
39
REF LO
Negative reference voltage
© 2002 Microchip Technology Inc.
DS21459B-page 5
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