TC7106A datasheet(6/32 Pages) MICROCHIP

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TC7106/A/TC7107/A

DS21455C-page 6

2.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 2-1.

TABLE 2-1:

PIN FUNCTION TABLE

Pin Number

(40-Pin PDIP)

Normal

Pin No.

(40-Pin PDIP)

(Reversed

Symbol

Description

(40)

V+

Positive supply voltage.

(39)

Activates the D section of the units display.

(38)

Activates the C section of the units display.

(37)

Activates the B section of the units display.

(36)

Activates the A section of the units display.

(35)

Activates the F section of the units display.

(34)

Activates the G section of the units display.

(33)

Activates the E section of the units display.

(32)

Activates the D section of the tens display.

(31)

Activates the C section of the tens display.

(30)

Activates the B section of the tens display.

(29)

Activates the A section of the tens display.

(28)

Activates the F section of the tens display.

(27)

Activates the E section of the tens display.

(26)

Activates the D section of the hundreds display.

(25)

Activates the B section of the hundreds display.

(24)

Activates the F section of the hundreds display.

(23)

Activates the E section of the hundreds display.

(22)

AB4

Activates both halves of the 1 in the thousands display.

(21)

POL

Activates the negative polarity display.

(20)

BP/GND

LCD Backplane drive output (TC7106A). Digital Ground (TC7107A).

(19)

Activates the G section of the hundreds display.

(18)

Activates the A section of the hundreds display.

(17)

Activates the C section of the hundreds display.

(16)

Activates the G section of the tens display.

(15)

V-

Negative power supply voltage.

(14)

VINT

Integrator output. Connection point for integration capacitor. See INTEGRATING

CAPACITOR section for more details.

(13)

VBUFF

Integration resistor connection. Use a 47k

Ω resistor for a 200mV full scale range and

a 47k

Ω resistor for 2V full scale range.

(12)

CAZ

The size of the auto-zero capacitor influences system noise. Use a 0.47

μF capacitor

for 200mV full scale, and a 0.047

μF capacitor for 2V full scale. See Section 7.1

“Auto-Zero Capacitor (CAZ)” on Auto-Zero Capacitor for more details.

(11)

VIN-

The analog LOW input is connected to this pin.

(10)

VIN+

The analog HIGH input signal is connected to this pin.

(9)

ANALOG

COMMON

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.

(8)

CREF-

See Pin 34.

(7)

CREF+A 0.1μF capacitor is used in most applications. If a large Common mode voltage

exists (for example, the VIN- pin is not at analog common), and a 200mV scale is

used, a 1

μF capacitor is recommended and will hold the rollover error to 0.5 count.

(6)

VREF-

See Pin 36.

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