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PCF8545 Datasheet(PDF) 7 Page - NXP Semiconductors

Part # PCF8545
Description  Universal LCD driver for multiplex rates up to 1:8
PDF  68 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8545 Datasheet(HTML) 7 Page - NXP Semiconductors

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NXP Semiconductors
PCF8545
Universal LCD driver for multiplex rates up to 1:8
Input or input/output pins must always be at a defined level (VSS or VDD) unless otherwise
specified.
Pin
Symbol
Type
Description
SDA
input/output I2C-bus serial data
42
SDI
input
SPI-bus data input
Table 3. Pin description of PCF8545ATT and PCF8545BTT...continued
[1]
VLCD must be equal to or greater than VDD.
[2]
Effect of backplane swapping is illustrated in Figure 5.
[3]
Bit BPS is explained in Section 7.1.3.
7 Functional description
The PCF8545 is a versatile peripheral device designed to interface any microcontroller
to a wide variety of LCDs. It can directly drive any multiplexed LCD containing up to eight
backplanes and up to 44 segments.
7.1 Commands of PCF8545
The PCF8545 is controlled by 9 commands, which are defined in Table 4. Any other
combinations of operation code bits that are not mentioned in this document may lead to
undesired operation modes of PCF8545.
Bits
Command name
Register
selection
RS[1:0][1]
7
6
5
4
3
2
1
0
Reference
initialize
0
0
0
0
0
1
0
1
1
0
Section 7.1.1
OTP-refresh
0
0
1
1
1
1
0
0
0
0
Section 7.1.2
mode-settings
0
0
0
1
0
1
BPS
INV
PD
E
Section 7.1.3
oscillator-control
0
0
0
0
0
1
1
EFR
COE
OSC
Section 7.1.4
set-MUX-mode
0
0
0
0
0
0
0
0
M[1:0]
Section 7.1.5
set-bias-mode
0
0
0
0
0
0
0
1
B[1:0]
Section 7.1.6
frame-frequency
0
0
0
0
1
FD[4:0]
Section 7.1.7
load-data-pointer
0
0
1
0
DP[5:0]
Section 7.1.8
write-RAM-data
0
1
D[7:0]
Section 7.1.9
Table 4. Commands of PCF8545
[1]
Information about control byte and register selection see Section 8.1.
7.1.1 Command: initialize
This command generates a chip-wide reset. It has the same function as the RESET pin.
Reset takes 1 ms to complete.
Bit
Symbol
Value
Description
7 to 0
-
0001 0110
fixed value
Table 5. Initialize - initialize command bit description
PCF8545
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2021. All rights reserved.
Product data sheet
Rev. 2 — 4 October 2021
7 / 68



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