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PCF8545 Datasheet(PDF) 34 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) 34 Page - NXP Semiconductors

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NXP Semiconductors
PCF8545
Universal LCD driver for multiplex rates up to 1:8
b0
b1
b2
b3
b4
b5
b6
b7
MSB
LSB
Transmitted data byte
b7
b6
b5
b4
Discarded
Display RAM addresses (columns)/segment outputs (S)
Columns
0 1 2 3 4 5 6 7
37 38 39 40 41
0
1
2
3
4
5
b3
b2
b0
b1
b2
b3
b4
b5
b6
b7
MSB
LSB
Transmitted data byte
b7
b6
b5
b4
Discarded
0 1 2 3 4 5 6 7
37 38 39 40 41
0
1
2
3
4
5
b0
b1
b2
b3
b4
b5
b6
b7
MSB
LSB
Transmitted data byte
b7
b6
Discarded
0 1 2 3 4 5 6 7
37 38 39 40 41
0
1
2
3
4
5
013aaa458
Figure 23. Boundary condition in 1:6 multiplex drive mode
7.9.4 RAM filling in 1:8 multiplex drive mode
In the 1:8 multiplex drive mode the RAM is organized in eight rows and 40 columns. The
eight transmitted data bits are placed into eight rows of one display RAM column (see
Figure 24). In order to fill the whole RAM, 40 bytes need to be sent to the PCF8545. After
the last byte sent, the data pointer must be reset before the next RAM content update.
Additional data bytes sent are discarded.
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
34 / 68



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