tc7107a Microchip Technology Inc., tc7107a Datasheet - Page 6

• Manufacturer Part Number: tc7107a
• Description: 3-1/2 Digit Analog-to-digital Converters
• Manufacturer: Microchip Technology Inc.

TC7106/A/TC7107/A
2.0
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
DS21455C-page 6
(40-Pin PDIP)
Pin Number
Normal
10
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
11
1
2
3
4
5
6
7
8
9
PIN DESCRIPTIONS
(40-Pin PDIP)
(Reversed
PIN FUNCTION TABLE
Pin No.
(40)
(39)
(38)
(37)
(36)
(35)
(34)
(33)
(32)
(31)
(30)
(29)
(28)
(27)
(26)
(25)
(24)
(23)
(22)
(21)
(20)
(19)
(18)
(17)
(16)
(15)
(14)
(13)
(12)
(10)
(11)
(9)
(8)
(7)
(6)
COMMON
ANALOG
BP/GND
Symbol
C
V
C
V
V
POL
V
AB
C
V
BUFF
REF
REF
V+
D
C
G
D
C
D
G
C
G
REF
B
A
F
E
B
A
F
E
B
F
E
A
V-
IN
INT
IN
AZ
1
1
1
1
2
2
2
2
3
3
3
3
1
1
1
2
2
3
3
3
2
4
+
-
+
-
-
Positive supply voltage.
Activates the D section of the units display.
Activates the C section of the units display.
Activates the B section of the units display.
Activates the A section of the units display.
Activates the F section of the units display.
Activates the G section of the units display.
Activates the E section of the units display.
Activates the D section of the tens display.
Activates the C section of the tens display.
Activates the B section of the tens display.
Activates the A section of the tens display.
Activates the F section of the tens display.
Activates the E section of the tens display.
Activates the D section of the hundreds display.
Activates the B section of the hundreds display.
Activates the F section of the hundreds display.
Activates the E section of the hundreds display.
Activates both halves of the 1 in the thousands display.
Activates the negative polarity display.
LCD Backplane drive output (TC7106A). Digital Ground (TC7107A).
Activates the G section of the hundreds display.
Activates the A section of the hundreds display.
Activates the C section of the hundreds display.
Activates the G section of the tens display.
Negative power supply voltage.
Integrator output. Connection point for integration capacitor. See INTEGRATING
CAPACITOR section for more details.
Integration resistor connection. Use a 47kΩ resistor for a 200mV full scale range and
a 47kΩ resistor for 2V full scale range.
The size of the auto-zero capacitor influences system noise. Use a 0.47μF capacitor
for 200mV full scale, and a 0.047μF capacitor for 2V full scale. See Section 7.1
“Auto-Zero Capacitor (CAZ)” on Auto-Zero Capacitor for more details.
The analog LOW input is connected to this pin.
The analog HIGH input signal is connected to this pin.
This pin is primarily used to set the Analog Common mode voltage for battery opera-
tion or in systems where the input signal is referenced to the power supply. It also
acts as a reference voltage source. See Section 8.3 “Analog Common (Pin 32)”
on ANALOG COMMON for more details.
See Pin 34.
A 0.1μF capacitor is used in most applications. If a large Common mode voltage
exists (for example, the V
used, a 1μF capacitor is recommended and will hold the rollover error to 0.5 count.
See Pin 36.
IN
- pin is not at analog common), and a 200mV scale is
Description
© 2006 Microchip Technology Inc.