TC7129CPL datasheet(9/15 Pages) TELCOM

Part #	TC7129CPL

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

PDF	15 Pages

Scroll/Zoom	100%

Manufacturer	TELCOM [TelCom Semiconductor, Inc]

Direct Link	http://www.telcom-semi.com

Logo

9 / 15 page

3-239

TELCOM SEMICONDUCTOR, INC.

Figure 5. External Logic Referenced Directly to DGND

Figure 6. External Logic Referenced to DGND With Buffer

Temperature Compensation

For most applications, VDISP (pin 19) can be connected

directly to DGND (pin 36). For applications with a wide

temperature range, some LCDs require that the drive levels

vary with temperature to maintain good viewing angle and

display contrast. Figure 7 shows two circuits that can be

adjusted to give temperature compensation of about 10

mV/

°C between V+ (pin 24) and VDISP. The diode between

DGND and VDISP should have a low turn-ON voltage be-

cause VDISP cannot exceed 0.3V below DGND.

EXTERNAL

LOGIC

DGND

ILOGIC

TC7129

V –

–

EXTERNAL

LOGIC

ILOGIC

DGND

TC7129

–

TC7129

1N4148

5 k

Ω

75 k

Ω

200 k

Ω

39 k

Ω

–

V+

VDISP

DGND

TC7129

2N2222

39 k

Ω

–

V+

VDISP

DGND

20 k

Ω

18 k

Ω

Figure 7.

Temperature Compensating Circuits

TC7129

4-1/2 DIGIT ANALOG-TO-DIGITAL

CONVERTER WITH ON-CHIP LCD DRIVERS

TC7129CPL Datasheet(PDF) 9 Page - TelCom Semiconductor, Inc

TC7129CPL Datasheet(HTML) 9 Page - TelCom Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Datasheet Download

Link URL