PCF85133USLASH2DASLASH1 datasheet(4/41 Pages) NXP

4 / 41 page

PCF85133_1

Product data sheet

Rev. 1 — 17 February 2009

4 of 41

NXP Semiconductors

PCF85133

Universal LCD driver for low multiplex rates

Functional description

The PCF85133 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 PCF85133 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.

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

channel with the PCF85133.

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.

Table 4.

Possible display conﬁgurations

Number of

7-segment numeric

14-segment numeric

Dot matrix

Backplanes

Elements

Digits

Indicator

symbols

Characters Indicator

symbols

320

320 (4

× 80)

240

240 (3

× 80)

160

160 (2

× 80)

80 (1

× 80)

Fig 3.

Typical system conﬁguration

HOST

MICRO-

PROCESSOR/

MICRO-

CONTROLLER

2Cb

SDA

SDAACK

SCL

OSC

80 segment drives

4 backplanes

LCD PANEL

(up to 320

elements)

PCF85133

SA0

VDD

VSS

VDD

VLCD

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