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参数资料
| 型号： | PCA8575PW,112 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 28/30页 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER I2C 16B 24TSSOP |
| 产品培训模块： | I²C Bus Fundamentals |
| 特色产品： | NXP - I2C Interface |
| 标准包装： | 63 |
| 接口： | I²C |
| 输入/输出数： | 16 |
| 中断输出： | 是 |
| 频率 - 时钟： | 400kHz |
| 电源电压： | 2.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 24-TSSOP |
| 包装： | 管件 |
| 包括： | POR |
| 产品目录页面： | 824 (CN2011-ZH PDF) |
| 其它名称： | 568-4230-5 935283505112 PCA8575PW PCA8575PW-ND |
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PCA8575_2
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 02 — 21 March 2007
7 of 30
NXP Semiconductors
PCA8575
Remote 16-bit I/O expander for I2C-bus with interrupt
8.
I/O programming
8.1 Quasi-bidirectional I/O architecture
The PCA8575’s 16 ports (see Figure 2) are entirely independent and can be used either
as input or output ports. Input data is transferred from the ports to the microcontroller in
the Read mode (see Figure 12). Output data is transmitted to the ports in the Write mode
(see Figure 11).
Every data transmission from the PCA8575 must consist of an even number of bytes, the
rst byte will be referred to as P07 to P00, and the second byte as P17 to P10. The third
will be referred to as P07 to P00, and so on.
This quasi-bidirectional I/O can be used as an input or output without the use of a control
signal for data directions. At power-on the I/Os are HIGH. In this mode only a current
source (IOH) to VDD is active. An additional strong pull-up to VDD (Itrt(pu)) allows fast rising
edges into heavily loaded outputs. These devices turn on when an output is written HIGH,
and are switched off by the negative edge of SCL. The I/Os should be HIGH before being
used as inputs. After power-on, as all the I/Os are set HIGH, all of them can be used as
inputs. Any change in setting of the I/Os as either inputs or outputs can be done with the
Write mode.
Remark: If a HIGH is applied to an I/O which has been written earlier to LOW, a large
current (IOL) will ow to VSS.
8.2 Writing to the port (Output mode)
To write, the master (microcontroller) rst addresses the slave device. By setting the last
bit of the byte containing the slave address to logic 0 the Write mode is entered. The
PCA8575 acknowledges and the master sends the rst data byte for P07 to P00. After the
rst data byte is acknowledged by the PCA8575, the second data byte P17 to P10 is sent
by the master. Once again, the PCA8575 acknowledges the receipt of the data. Each 8-bit
data is presented on the port lines after it has been acknowledged by the PCA8575.
The number of data bytes that can be sent successively is not limited. After every two
bytes, the previous data is overwritten.
The rst data byte in every pair refers to Port 0 (P07 to P00), whereas the second data
byte in every pair refers to Port 1 (P17 to P10). See Figure 10.
Fig 10. Correlation between bits and ports
A
002aab634
06
05
04
03
02
01
00
first byte
07
P06 P05 P04 P03 P02 P01 P00
P07
A
16
15
14
13
12
11
10
second byte
17
P16 P15 P14 P13 P12 P11 P10
P17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PCA8576C | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Universal LCD driver for low multiplex rates |
| PCA8576CH/Q900,157 | 功能描述:LCD 驱动器 UNIVERSAL LCD DRIVER LOW MULTIPLEX RATES RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| PCA8576CH/Q900/1 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Universal LCD driver for low multiplex rates |
| PCA8576CH/Q900/1,1 | 功能描述:LCD 驱动器 MULT DIG/SEG 200KHz RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| PCA8576CH/Q900/1,118 | 制造商:NXP Semiconductors 功能描述:Cut Tape 制造商:NXP Semiconductors 功能描述:0 |
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