参数资料
型号: PCA9538D,118
厂商: NXP Semiconductors
文件页数: 31/34页
文件大小: 0K
描述: IC I/O EXPANDER I2C 8B 16SOIC
产品培训模块: I²C Bus Fundamentals
特色产品: NXP - I2C Interface
标准包装: 1
接口: I²C,SM 总线
输入/输出数: 8
中断输出:
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: 16-SOIC(0.295",7.50mm 宽)
供应商设备封装: 16-SO
包装: 标准包装
包括: POR
其它名称: 568-1839-6
PCA9538
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
6 of 34
NXP Semiconductors
PCA9538
8-bit I2C-bus and SMBus low power I/O port with interrupt and reset
6.
Functional description
6.1 Device address
6.2 Registers
6.2.1 Command byte
The command byte is the first byte to follow the address byte during a write transmission.
It is used as a pointer to determine which of the registers will be written or read.
6.2.2 Register 0 - Input Port register
This register is a read-only port. It reflects the incoming logic levels of the pins, regardless
of whether the pin is defined as an input or an output by Register 3. Writes to this register
have no effect.
The default value ‘X’ is determined by the externally applied logic level.
Fig 5.
PCA9538 address
R/W
002aae707
1
0
A1
A0
slave address
fixed
hardware
selectable
Table 4.
Command byte
Command
Protocol
Function
0
read byte
Input Port register
1
read/write byte
Output Port register
2
read/write byte
Polarity Inversion register
3
read/write byte
Configuration register
Table 5.
Register 0 - Input Port register bit description
Legend: * default value.
Bit
Symbol
Access
Value
Description
7
I7
read only
X*
value ‘X’ is determined by externally applied
logic level
6
I6
read only
X*
5
I5
read only
X*
4
I4
read only
X*
3
I3
read only
X*
2
I2
read only
X*
1
I1
read only
X*
0
I0
read only
X*
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