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参数资料
| 型号： | PCA9539RPW,112 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 3/37页 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER I2C 16B 24TSSOP |
| 标准包装： | 1,575 |
| 接口： | I²C，SM 总线 |
| 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 |
| 其它名称： | 935286605112 PCA9539RPW PCA9539RPW-ND |
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PCA9539_PCA9539R
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 6 — 6 February 2013
11 of 37
NXP Semiconductors
PCA9539; PCA9539R
16-bit I2C-bus and SMBus low power I/O port with interrupt and reset
6.6.2 Reading the port registers
In order to read data from the PCA9539; PCA9539R, the bus master must first send the
PCA9539; PCA9539R address with the least significant bit set to a logic 0 (see Figure 5
“PCA9539; PCA9539R device address”). The command byte is sent after the address and
determines which register will be accessed. After a restart, the device address is sent
again, but this time the least significant bit is set to a logic 1. Data from the register
defined by the command byte will then be sent by the PCA9539; PCA9539R (see
the acknowledge clock pulse. After the first byte is read, additional bytes may be read but
the data will now reflect the information in the other register in the pair. For example, if you
read Input port 1, then the next byte read would be Input port 0. There is no limitation on
the number of data bytes received in one read transmission but the final byte received, the
bus master must not acknowledge the data.
Remark: Transfer can be stopped at any time by a STOP condition.
Fig 9.
Read from register
A
S
START condition
R/W
acknowledge
from slave
002aad727
A
acknowledge
from slave
SDA
A
P
acknowledge
from master
DATA (first byte)
slave address
STOP
condition
S
(repeated)
START condition
(cont.)
1101
A1 A0
1
A
1
R/W
acknowledge
from slave
slave address
at this moment master-transmitter becomes master-receiver
and slave-receiver becomes slave-transmitter
NA
no acknowledge
from master
COMMAND BYTE
1101
A1 A0
1
0
data from lower or
upper byte of register
LSB
MSB
DATA (last byte)
data from upper or
lower byte of register
LSB
MSB
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PCA9540 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:2-channel I2C multiplexer |
| PCA9540B | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:2-channel I2C-bus multiplexer |
| PCA9540BD | 功能描述:编码器、解码器、复用器和解复用器 I2C MUX 2CH BI-DIR RoHS:否 制造商:Micrel 产品:Multiplexers 逻辑系列:CMOS 位数: 线路数量（输入/输出）:2 / 12 传播延迟时间:350 ps, 400 ps 电源电压-最大:2.625 V, 3.6 V 电源电压-最小:2.375 V, 3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Tray |
| PCA9540BD,112 | 功能描述:编码器、解码器、复用器和解复用器 I2C MUX 2CH BI-DIR RoHS:否 制造商:Micrel 产品:Multiplexers 逻辑系列:CMOS 位数: 线路数量（输入/输出）:2 / 12 传播延迟时间:350 ps, 400 ps 电源电压-最大:2.625 V, 3.6 V 电源电压-最小:2.375 V, 3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Tray |
| PCA9540BD,118 | 功能描述:编码器、解码器、复用器和解复用器 2-CHANNEL I2C MULTIPLEXER RoHS:否 制造商:Micrel 产品:Multiplexers 逻辑系列:CMOS 位数: 线路数量（输入/输出）:2 / 12 传播延迟时间:350 ps, 400 ps 电源电压-最大:2.625 V, 3.6 V 电源电压-最小:2.375 V, 3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Tray |
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