TC7107ACKW datasheet(6/34 Pages) MICROCHIP

6 / 34 page

TC7106/A/TC7107/A

DS21455D-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 47 k

Ω resistor for a 200 mV full scale range

and a 47 k

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 200 mV 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

operation 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 0.1 µF 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 200 mV 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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