PCF8562 查看數據表（PDF） - Philips Electronics
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PCF8562 Datasheet PDF : 36 Pages
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Philips Semiconductors
Universal LCD driver
for low multiplex rates
Preliminary specification
PCF8562
6 FUNCTIONAL DESCRIPTION
The PCF8562 is a versatile peripheral device designed to interface any microprocessor/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 display configurations possible with the PCF8562 depend on the number of active backplane outputs required. A
selection of display configurations is shown in Table 1; all of these configurations can be implemented in the typical
system shown in Fig.4.
The host microprocessor/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.
Table 1 Selection of display configurations
NUMBER OF
BACKPLANE
S
4
3
2
1
SEGMENTS
128
86
64
32
7-SEGMENTS NUMERIC
DIGITS
16
12
8
4
INDICATOR
SYMBOLS
16
12
8
4
14-SEGMENTS
ALPHANUMERIC
CHARACTERS
8
6
4
2
INDICATOR
SYMBOLS
16
12
8
4
DOT MATRIX
128 dots (4 × 32)
96 dots (3 × 32)
64 dots (2 × 32)
32 dots (1 × 32)
VDD
R
≤
tr
2CB
HOST
MICRO-
PROCESSOR/
MICRO-
CONTROLLER
VSS
SDA
SCL
OSC
VDD VLCD
PCF8562
32 segment drives
4 backplanes
LCD PANEL
(up to 128
elements)
A0 A1 A2 SA0 VSS
MDB079v2
The resistance of the power supply lines must be kept to a minimum.
Fig.4 Typical system configuration.
November 22, 2004
7
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