参数资料
型号: PCA8574TS,112
厂商: NXP Semiconductors
文件页数: 29/32页
文件大小: 0K
描述: IC I/O EXPANDER I2C 8B 20SSOP
特色产品: NXP - I2C Interface
标准包装: 75
接口: I²C
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: 20-LSSOP(0.173",4.40mm 宽)
供应商设备封装: 20-SSOP
包装: 管件
包括: POR
其它名称: 568-4242-5
935283487112
PCA8574TS
PCA8574_PCA8574A
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 3 — 3 June 2013
6 of 32
NXP Semiconductors
PCA8574; PCA8574A
Remote 8-bit I/O expander for I2C-bus with interrupt
The last bit of the first byte defines the operation to be performed. When set to logic 1 a
read is selected, while a logic 0 selects a write operation (write operation is shown in
7.1.1 Address maps
The PCA8574 and PCA8574A are functionally the same, but have a different fixed portion
(A6 to A3) of the slave address. This allows eight of the PCA8574 and eight of the
PCA8574A to be on the same I2C-bus without address conflict.
Table 4.
PCA8574 address map
Pin connectivity
Address of PCA8574
Address byte value
7-bit
hexadecimal
address
without R/W
A2
A1
A0
A6 A5 A4 A3 A2 A1 A0 R/W
Write
Read
VSS
0100
000
-
40h
41h
20h
VSS
VDD
0100
001
-
42h
43h
21h
VSS
VDD
VSS
0100
010
-
44h
45h
22h
VSS
VDD
0100
011
-
46h
47h
23h
VDD
VSS
0100
100
-
48h
49h
24h
VDD
VSS
VDD
0100
101
-
4Ah
4Bh
25h
VDD
VSS
0100
110
-
4Ch
4Dh
26h
VDD
0100
111
-
4Eh
4Fh
27h
Table 5.
PCA8574A address map
Pin connectivity
Address of PCA8574A
Address byte value
7-bit
hexadecimal
address
without R/W
A2
A1
A0
A6 A5 A4 A3 A2 A1 A0 R/W
Write
Read
VSS
011
10
00
-
70h
71h
38h
VSS
VDD
011
10
01
-
72h
73h
39h
VSS
VDD
VSS
011
10
-
74h
75h
3Ah
VSS
VDD
011
10
11
-
76h
77h
3Bh
VDD
VSS
011
11
00
-
78h
79h
3Ch
VDD
VSS
VDD
011
11
01
-
7Ah
7Bh
3Dh
VDD
VSS
011
11
10
-
7Ch
7Dh
3Eh
VDD
011
11
-
7Eh
7Fh
3Fh
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