PCF8566P datasheet(6/48 Pages) NXP

6 / 48 page

PCF8566_7

Product data sheet

Rev. 07 — 25 February 2009

6 of 48

NXP Semiconductors

PCF8566

Universal LCD driver for low multiplex rates

[1]

The substrate (rear side of the die) is wired to VDD but should not be electrically connected.

Functional description

The PCF8566 is a versatile peripheral device designed to interface any

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

or multiplexed LCD containing up to 4 backplanes and up to 24 segments.

The display conﬁgurations possible with the PCF8566 depend on the number of active

backplane outputs required. Display conﬁguration selection is shown in Table 4. All of the

display conﬁgurations given in Table 4 can be implemented in the typical system shown in

Figure 4.

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

channel with the PCF8566.

Biasing voltages for the multiplexed LCD waveforms are generated internally, removing

the need for an external bias generator. The internal oscillator is selected by connecting

pin OSC to VSS. The only other connections required to complete the system are the

power supplies (pins VDD, VSS and VLCD) and the LCD panel selected for the application.

BP0

LCD backplane outputs

BP2

BP1

BP3

S0 to S23

17 to 40

LCD segment outputs

Table 3.

Pin description …continued

Symbol

Description

Table 4.

Display conﬁgurations

Backplanes Elements

7-segment numeric

14-segment numeric

Dot matrix

Digits

Indicator

symbols

Characters

Indicator

symbols

96 (4

× 24)

372

99416

72 (3

× 24)

248

663648 (2

× 24)

124

33110

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