OM4068 Просмотр технического описания (PDF) - Philips Electronics

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OM4068

LCD driver for low multiplex rates

Philips Electronics 

Philips Semiconductors

LCD driver for low multiplex rates

Product specification

OM4068

FUNCTIONAL DESCRIPTION

The OM4068 is a low-power LCD driver designed to

interface with any microprocessor/microcontroller and a

wide variety of LCDs. It can drive any static or multiplexed

LCD containing up to three backplanes and

up to 96 segments.

The display configurations possible with the OM4068

depend on the number of active backplane outputs

required; a selection of display configurations is given in

Table 1.

A typical system (MUX 1 : 3) is shown in Fig.4.

Table 1 Selection of display configurations

NUMBER OF

BACKPLANES

3

2

1

DISPLAY

SEGMENTS

96

64

32

7-SEGMENTS NUMERIC

DIGITS

12

8

4

INDICATOR

SYMBOLS

12

8

4

DOT MATRIX

96 dots (3 × 32)

64 dots (2 × 32)

32 dots (1 × 32)

handbook, full pagewidthVDD

HOST

MICROPROCESSOR/

MICROCONTROLLER

VSS

SDIN

SCLK

SCE

VDD

VLCD

OM4068

32 segment drivers(1) LCD PANEL

3 backplanes

(up to 96

elements)

M1 M0

VSS

SDOUT

MBK818

(1) 28 segment drivers for DIP40 package.

Fig.4 Typical system configuration.

The host microprocessor/microcontroller maintains the

3-line bus communication channel with OM4068.

The internal oscillator requires no external components.

The appropriate intermediate biasing voltage for the

multiplexed LCD waveforms are generated on-chip.

The only other connections required to complete the

system are to the power supplies (VSS, VDD and VLCD) and

suitable capacitors to decouple the VLCD and VDD pins to

VSS.

1998 Jun 18

8

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