参数资料
型号: PCA8575DB,112
厂商: NXP Semiconductors
文件页数: 27/30页
文件大小: 0K
描述: IC I/O EXPANDER I2C 16B 24SSOP
标准包装: 59
接口: I²C
输入/输出数: 16
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: 24-SSOP(0.209",5.30mm 宽)
供应商设备封装: 24-SSOP
包装: 管件
包括: POR
其它名称: 935283503112
PCA8575DB
PCA8575DB-ND
PCA8575_2
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 02 — 21 March 2007
6 of 30
NXP Semiconductors
PCA8575
Remote 16-bit I/O expander for I2C-bus with interrupt
7.
Functional description
7.1 Device address
Following a START condition, the bus master must send the address of the slave it is
accessing and the operation it wants to perform (read or write). The address of the
PCA8575 is shown in Figure 9. Slave address pins AD2, AD1, and AD0 choose 1 of
8 slave addresses. To conserve power, no internal pull-up resistors are incorporated on
AD2, AD1, and AD0. Address values depending on AD2, AD1, and AD0 can be found in
Remark: The General Call address (0000 0000b) and the Device ID address
(1111 100Xb) are reserved and cannot be used as device address. Failure to follow this
requirement will cause the PCA8575 not to acknowledge.
The last bit of the rst byte denes the operation to be performed. When set to logic 1 a
read is selected, while a logic 0 selects a write operation.
When AD2, AD1 and AD0 are held to VDD or VSS, the same address as the PCF8575 is
applied.
7.1.1 Address map
Fig 9.
PCA8575 address
R/W
002aab636
A6
A5
A4
A3
A2
A1
A0
programmable
slave address
Table 3.
PCA8575 address map
A6
A5
A4
A3
A2
A1
A0
Address (hex)
010000020h
010000121h
010001022h
010001123h
010010024h
010010125h
010011026h
010011127h
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