参数资料
型号: PCA9557D,118
厂商: NXP Semiconductors
文件页数: 28/30页
文件大小: 0K
描述: IC I/O EXPANDER I2C 8B 16SOIC
标准包装: 2,500
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(0.154",3.90mm 宽)
供应商设备封装: 16-SO
包装: 带卷 (TR)
包括: POR
其它名称: 935270674118
PCA9557D-T
PCA9557D-T-ND
PCA9557
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 7 — 10 December 2013
7 of 30
NXP Semiconductors
PCA9557
8-bit I2C-bus and SMBus I/O port with reset
7.
Functional description
7.1 Device address
Following a START condition the bus master must output the address of the slave it is
accessing. The address of the PCA9557 is shown in Figure 8. To conserve power, no
internal pull-up resistors are incorporated on the hardware selectable address pins and
they must be pulled HIGH or LOW.
The last bit of the slave address defines the operation to be performed. When set to
logic 1 a read is selected, while a logic 0 selects a write operation.
7.2 Control register
Following the successful acknowledgement of the slave address, the bus master will send
a byte to the PCA9557, which will be stored in the control register. This register can be
written and read via the I2C-bus.
Fig 8.
PCA9557 device address
002aad279
0
1
A2
A1
A0 R/W
fixed
slave address
programmable
Fig 9.
Control register
Table 4.
Register definition
D1
D0
Name
Access
Description
0
Register 0
read-only
Input port register
0
1
Register 1
read/write
Output port register
1
0
Register 2
read/write
Polarity inversion register
1
Register 3
read/write
Configuration register
002aad280
0
D1
D0
76543210
bit:
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