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PCF8545ATT датащи(PDF) 6 Page - NXP Semiconductors

номер детали PCF8545ATT
подробное описание детали  Universal 36 횞 4 LCD segment driver
PDF  51 Pages
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производитель  NXP [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8545ATT датащи(HTML) 6 Page - NXP Semiconductors

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NXP Semiconductors
PCF8551
Universal 36 × 4 LCD segment driver
Input or input/output pins must always be at a defined level (VSS or VDD) unless otherwise specified.
Pin
Symbol
Type
Description
14
CLK
input/output
internal oscillator output, external oscillator input[1]
• must be left open if unused
15
SCL
input
serial clock input
17
PORE[2]
input
Power-On Reset (POR) enable
• connect to VDD for enabling POR
• connect to VSS (or leave open) for disabling POR
Pin layout depending on product and bus type
PCF8551ATT
(I2C-bus)
PCF8551BTT
(SPI-bus)
T1
-
-
must be left open or connected to VSS
13
-
SDIO
input/output
serial data input/output
SDA
-
input/output
serial data line
16
-
CE
input
chip enable input, active LOW
Table 3. Pin description...continued
[1]
Can be configured by command, see Table 5.
[2]
A series resistance between VDD and the pin must not exceed 1 kΩ to ensure proper functionality, see Section 15.3.
7 Functional description
7.1 Registers of the PCF8551
The registers of the PCF8551 are arranged in bytes with 8 bit, addressed by an address
pointer. Table 4 depicts the layout.
Bits labeled as 0 must always be written with logic 0; bits labeled as - are ignored by the device.
Address Bits
Register name
AP[4:0]
7
6
5
4
3
2
1
0
Reference
Command registers
Software_reset 00h
SR[7:0]
Table 8
Device_ctrl
01h
0
0
0
0
FF[1:0]
OSC
COE
Table 5
Display_ctrl_1
02h
0
0
0
BOOST MUX[1:0]
B
DE
Table 6
Display_ctrl_2
03h
0
0
0
0
0
BL[1:0]
INV
Table 7
Display data registers
04h
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0
05h
SEG15 SEG14 SEG13 SEG12 SEG11 SEG10 SEG9
SEG8
06h
SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 SEG16
07h
SEG31 SEG30 SEG29 SEG28 SEG27 SEG26 SEG25 SEG24
COM0
08h
-
-
-
-
SEG35 SEG34 SEG33 SEG32
Table 9
Table 4. Registers of the PCF8551
PCF8551
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2021. All rights reserved.
Product data sheet
Rev. 3.1 — 3 May 2021
6 / 51



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