TC7129 View Datasheet(PDF) - TelCom Semiconductor Inc => Microchip

Part Name

Description

Manufacturer

TC7129

4-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTER WITH ON-CHIP LCD DRIVERS

TelCom Semiconductor Inc => Microchip 

4-1/2 DIGIT ANALOG-TO-DIGITAL

CONVERTER WITH ON-CHIP LCD DRIVERS

1

TC7129

LOW BATTERY

CONTINUITY

2

BP1

BP2 BACKPLANE

CONNECTIONS

LOW BATTERY

BP3

CONTINUITY

3

F4, E4, DP4

A4, G4, D4

B4, C4, BC4

F3, E3, DP3

A3, G3, D3

B3, C3, MINUS

4

B1, C1, CONTINUITY

A1, G1, D1

F1, E1, DP1

B2, C2, LOW BATTERY

A2, G2, D2

F2, E2, DP2

5

Figure 17. Display Segment Assignments

BP1

BP2

BP3

Figure 18. Backplane Waveforms

The ANNUNCIATOR DRIVE output (pin 3) is a square-

wave running at the backplane frequency (100 Hz or 83.3 Hz),

with a peak-to-peak voltage equal to DGND voltage. Con-

necting an annunciator to pin 3 turns it ON; connecting it to

its backplane turns it OFF.

TELCOM SEMICONDUCTOR, INC.

b SEGMENT

LINE

ALL OFF

a SEGMENT

ON

d, g OFF

VDD

VH

VL

VDISP

6

VDD

VH

VL

VDISP

a, g ON

d OFF

VDD

VH

VL

7

VDISP

ALL ON

VDD

VH

VL

VDISP

Figure 19. Typical Display Output Waveforms

8

3-245

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