TC7129CLW Просмотр технического описания (PDF) - Microchip Technology
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TC7129CLW Datasheet PDF : 28 Pages
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TC7129
2.0 PIN DESCRIPTIONS
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
1
40
2
2
41
3
3
42
4
4
43
5
5
44
6
6
1
7
7
2
8
8
3
9
9
4
10
10
5
11
11
7
13
12
8
14
13
9
15
14
10
16
15
11
17
16
12
18
17
13
19
18
14
20
19
15
21
20
16
22
21
18
24
22
19
25
23
20
26
24
21
27
25
22
28
26
23
29
27
24
30
28
25
31
29
26
32
30
27
33
31
29
35
32
30
36
33
31
37
34
32
38
35
33
39
Symbol
OSC1
OSC3
ANNUNCIATOR
B1, C1, CONT
A1, G1, D1
F1, E1, DP1
B2, C2,
LO BATT
A2, G2, D2
F2, E2, DP2
B3, C3, MINUS
A3, G3, D3
F3, E3, DP3
B4, C4, BC5
A4, D4, G4
F4, E4, DP4
BP3
BP2
BP1
VDISP
DP4/OR
DP3/UR
LATCH/HOLD
V–
V+
INT IN
INT OUT
CONTINUITY
COMMON
CREF+
CREF–
BUFFER
IN LO
IN HI
REF HI
REF LO
Function
Input to first clock inverter.
Output of second clock inverter.
Backplane square wave output for driving annunciators.
Output to display segments.
Output to display segments.
Output to display segments.
Output to display segments.
Output to display segments.
Output to display segments.
Output to display segments.
Output to display segments.
Output to display segments.
Output to display segments.
Output to display segments.
Output to display segments.
Backplane #3 output to display.
Backplane #2 output to display.
Backplane #1 output to display.
Negative rail for display drivers.
Input: When high, turns on most significant decimal point.
Output: Pulled high when result count exceeds ±19,999.
Input: Second-most significant decimal point on when high.
Output: Pulled high when result count is less than ±1000.
Input: When floating, ADC operates in Free Run mode. When
pulled high, the last displayed reading is held. When pulled low,
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.
Negative power supply terminal.
Positive power supply terminal and positive rail for display
drivers.
Input to integrator amplifier.
Output of integrator amplifier.
Input: When low, continuity flag on the display is off. When high,
continuity flag is on.
Output: High when voltage between inputs is less than +200 mV.
Low when voltage between inputs is more than +200 mV.
Sets common mode voltage of 3.2V below V+ for DE, 10X, etc.
Can be used as pre-regulator for external reference.
Positive side of external reference capacitor.
Negative side of external reference capacitor.
Output of buffer amplifier.
Negative input voltage terminal.
Positive input voltage terminal.
Positive reference voltage.
Negative reference voltage
© 2006 Microchip Technology Inc.
DS21459D-page 5
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