PCF8562TTSLASH2 datasheet(5/36 Pages) NXP

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PCF8562_3

Product data sheet

Rev. 3 — 2 December 2008

5 of 36

NXP Semiconductors

PCF8562

Universal LCD driver for low multiplex rates

Functional description

The PCF8562 is a versatile peripheral device designed to interface any

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

static or multiplexed LCD containing up to four backplanes and up to 32 segments.

The possible display conﬁgurations of the PCF8562 depend on the number of active

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

of these conﬁgurations can be implemented in the typical system shown in Figure 3.

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

channel with the PCF8562. The internal oscillator is enabled by connecting

pin OSC to pin VSS. The appropriate biasing voltages for the multiplexed LCD waveforms

are generated internally. The only other connections required to complete the system are

to the power supplies (VDD, VSS and VLCD) and the LCD panel chosen for the application.

7.1 Power-on reset

At power-on the PCF8562 resets to the following starting conditions:

VLCD

LCD supply voltage

BP0 to BP3

22 to 25

LCD backplane outputs

S0 to S22,

S23 to S31

26 to 48,

1 to 9

LCD segment outputs

Table 3.

Pin description …continued

Symbol

Description

Table 4.

Display conﬁgurations

Number of:

7-segment numeric

14-segment numeric

Dot matrix

Backplanes

Segments Digits Indicator

symbols

Characters

Indicator

symbols

128

128 dots (4

× 32)

96 dots (3

× 32)

64 dots (2

× 32)

32 dots (1

× 32)

The resistance of the power lines must be kept to a minimum.

Fig 3.

Typical system conﬁguration

HOST

MICRO-

PROCESSOR/

MICRO-

CONTROLLER

2Cb

SDA

SCL

OSC

32 segment drives

4 backplanes

LCD PANEL

(up to 128

elements)

PCF8562

SA0

VDD

VSS

VDD

VLCD

001aac264

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