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PCA85133
(Rev.:2009)

Universal LCD driver for low multiplex rates

NXP Semiconductors. 

NXP Semiconductors

PCA85133

Universal LCD driver for low multiplex rates

7. Functional description

The PCA85133 is a versatile peripheral device, designed to interface between any

microprocessor or microcontroller to a wide variety of LCDs. It can directly drive any static

or multiplexed LCD containing up to four backplanes and up to 80 segments.

The display configurations possible with the PCA85133 depend on the required number of

active backplane outputs. A selection of display configurations is shown in Table 4.

All of the display configurations can be implemented in a typical system as shown in

Figure 3.

Table 4. Possible display configurations

Number of

7-segment alphanumeric

Backplanes

Elements

Digits

Indicator

symbols

4

320

40

40

3

240

30

30

2

160

20

20

1

80

10

10

14-segment alphanumeric

Characters

Indicator

symbols

20

40

16

16

10

20

5

10

Dot matrix

320 (4 × 80)

240 (3 × 80)

160 (2 × 80)

80 (1 × 80)

VDD

R

≤

tr

2Cb

HOST

MICRO-

PROCESSOR/

MICRO-

CONTROLLER

SDAACK

SDA

SCL

OSC

FF

VDD VLCD

PCA85133

80 segment drives

LCD PANEL

4 backplanes

(up to 320

elements)

A0 A1 A2 SA0 VSS

VSS

013aaa046

Fig 3. Typical system configuration

The host microprocessor or microcontroller maintains the 2-line I2C-bus communication

channel with the PCA85133.

The internal oscillator is selected by connecting pin OSC to VSS. The only other

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

and the LCD panel selected for the application.

PCA85133_1

Product data sheet

Rev. 1 — 23 October 2009

© NXP B.V. 2009. All rights reserved.

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