参数资料
| 型号： | PCA9574PW,112 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 31/33页 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER I2C 8B 16TSSOP |
| 标准包装： | 96 |
| 接口： | I²C，SM 总线 |
| 输入/输出数： | 8 |
| 中断输出： | 是 |
| 频率 - 时钟： | 400kHz |
| 电源电压： | 1.1 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
| 包括： | POR |
| 其它名称： | 935285149112 PCA9574PW PCA9574PW-ND |
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PCA9574
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 4 — 25 April 2012
7 of 33
NXP Semiconductors
PCA9574
8-bit I2C-bus and SMBus, level translating, low volage GPIO
7.2 Command register
Following the successful acknowledgement of the slave address + R/W bit, the bus
master will send a byte to the PCA9574, which will be stored in the Command register.
The lowest three bits are used as a pointer to determine which register will be accessed.
Only a command register code with the three least significant bits equal to the eight
allowable values as defined in Table 4 “Register summary” will be acknowledged.
Reserved or undefined command codes will not be acknowledged. At power-up, this
register defaults to 00h, with the AI bit set to ‘0’, and the lowest 3 bits set to ‘0’.
If the Auto-Increment flag is set (AI = 1), the three least significant bits of the Command
register are automatically incremented after a read or write. This allows the user to
program and/or read the eight command registers (listed in Table 4) sequentially. It will
then roll over to register 00h after the last register is accessed and the selected registers
will be overwritten or re-read.
If the Auto-Increment flag is cleared (AI = 0), the three least significant bits are not
incremented after data is read or written, only one register will be repeatedly read or
written.
7.3 Register definitions
7.4 Writing to port registers
Data is transmitted to the PCA9574 by sending the device address and setting the least
significant bit to logic 0 (see Figure 6 for device address). The command byte is sent after
the address and determines which register will receive the data following the command
byte. Each 8-bit register may be updated independently of the other registers.
Reset state = 00h
Remark: The Command register does not apply to Software Reset I2C-bus address.
Fig 7.
Command register
002aad056
AI
X
D2
D1
D0
register address
Auto-Increment flag
Table 4.
Register summary
Register
number
D2
D1
D0
Name
Type
Function
00h
000IN
read only
Input port register
01h
001INVRT
read/write
Polarity inversion register
02h
0
1
0
BKEN
read/write
Bus-hold enable register
03h
011PUPD
read/write
Pull-up/pull-down selector register
04h
100CFG
read/write
Port configuration register
05h
101OUT
read/write
Output port register
06h
110MSK
read/write
Interrupt mask register
07h
111INTS
read only
Interrupt status register
相关PDF资料 |
PDF描述 |
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| PCA9574PW,118 | IC I/O EXPANDER I2C 8B 16TSSOP |
| 2-964577-2 | MULTIFIT RAHMEN 2P |
| 1-964577-5 | MULTIFIT RAHMEN 5P |
| 1-964576-3 | PCB RAHMEN 13P |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PCA9574PW-T | 功能描述:转换 - 电压电平 8-BIT I2C-BUS/SMBUS GPIO TRANS RoHS:否 制造商:Micrel 类型:CML/LVDS/LVPECL to LVCMOS/LVTTL 传播延迟时间:1.9 ns 电源电流:14 mA 电源电压-最大:3.6 V 电源电压-最小:3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MLF-8 |
| PCA9575HF,118 | 功能描述:I2C 接口集成电路 16-BIT I2C-BUS SMBus LW Voltage GPIO RoHS:否 制造商:NXP Semiconductors 电源电压-最大:5.5 V 电源电压-最小:2.3 V 最大工作频率:400 KHz 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-16 |
| PCA9575HF118 | 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
| PCA9575PW1,118 | 功能描述:I2C 接口集成电路 I2C Bus/ SMBus Level Translating 24-Pin RoHS:否 制造商:NXP Semiconductors 电源电压-最大:5.5 V 电源电压-最小:2.3 V 最大工作频率:400 KHz 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-16 |
| PCA9575PW2,118 | 功能描述:I2C 接口集成电路 I2C Bus/ SMBus Level Translating 28-Pin RoHS:否 制造商:NXP Semiconductors 电源电压-最大:5.5 V 电源电压-最小:2.3 V 最大工作频率:400 KHz 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-16 |
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