Electronic Components Datasheet Search
  English  ▼

X  

Preview PDF HTML

PCF8545 Datasheet(PDF) 39 Page - NXP Semiconductors

Part # PCF8545
Description  Universal LCD driver for multiplex rates up to 1:8
PDF  68 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8545 Datasheet(HTML) 39 Page - NXP Semiconductors

Back Button PCF8545 Datasheet HTML 35Page - NXP Semiconductors PCF8545 Datasheet HTML 36Page - NXP Semiconductors PCF8545 Datasheet HTML 37Page - NXP Semiconductors PCF8545 Datasheet HTML 38Page - NXP Semiconductors PCF8545 Datasheet HTML 39Page - NXP Semiconductors PCF8545 Datasheet HTML 40Page - NXP Semiconductors PCF8545 Datasheet HTML 41Page - NXP Semiconductors PCF8545 Datasheet HTML 42Page - NXP Semiconductors PCF8545 Datasheet HTML 43Page - NXP Semiconductors Next Button
Zoom Inzoom in Zoom Outzoom out
 39 / 68 page
background image
NXP Semiconductors
PCF8545
Universal LCD driver for multiplex rates up to 1:8
8.2.8 I2C-bus protocol
The I2C-bus protocol is shown in Figure 30. The sequence is initiated with a START
condition (S) from the I2C-bus controller which is followed by one of the two PCF8545
target addresses available. All PCF8545 with the corresponding A0 level acknowledge in
parallel to the target address. But any PCF8545 with the alternative A0 level ignore the
whole I2C-bus transfer.
After acknowledgement, a control byte follows (see Section 8.1).
The display bytes are stored in the display RAM at the address specified by the RAM
data pointer.
The acknowledgement after each byte is made only by the addressed PCF8545. After
the last data byte, the I2C-bus controller issues a STOP condition (P). Alternatively a
START may be issued to RESTART an I2C-bus access.
EXAMPLES
a) transmit two byte of RAM data
013aaa462
A
0
S 0 1 1 1 0
0
control byte
target address
RAM/command byte
RAM DATA
M
S
B
L
S
B
A
A
P
R/W = 0
S 0 1 1 1 0
0
0
1
A
A
A
P
A
b) transmit two command bytes
COMMAND
S 0 1 1 1 0
0
1 0
A
A
A
P
COMMAND
A
A
c) transmit one command byte and two RAM date bytes
COMMAND
S 0 1 1 1 0
0
1 0
0 0
0 0
A
A
A
P
A
A
A
C
O
R
S
1
0
A
0
0
A
0
0
A
0
A
1
R
S
0
0
0
0
0
1
RAM DATA
RAM DATA
RAM DATA
Figure 30. I2C-bus protocol write mode
8.2.8.1 Status read out
Status read out for I2C-bus operation only. This command initiates the read-out of a fixed
value plus the target address bit A0 from the PCF8545. The read-out function allows the
I2C controller to confirm the existence of the device on the I2C-bus.
Bit
Symbol
Value
Description
7 to 1
-
0101 010
fixed value
0
read back value is 0101 0100
0
A0
1
read back value is 0101 0101
Table 27. Status read out value
If a readout is made, the R/W bit must be logic 1 and then the next data byte following is
provided by the PCF8545 as shown in Figure 31.
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
39 / 68



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68


Datasheet Download

Go To PDF Page


Link URL



Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link to Datasheet    |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com