参数资料
型号: PCA8574TS,112
厂商: NXP Semiconductors
文件页数: 28/32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
5 of 32
NXP Semiconductors
PCA8574; PCA8574A
Remote 8-bit I/O expander for I2C-bus with interrupt
6.2 Pin description
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 format of the
PCA8574/74A is shown in Figure 6. Slave address pins A2, A1 and A0 are held HIGH or
LOW to choose one of eight slave addresses. To conserve power, no internal pull-up
resistors are incorporated on pins A2, A1, or A0 so they must be externally held HIGH or
LOW. The address pins (A2, A1, A0) can connect to VDD or VSS directly or through
resistors.
Table 3.
Pin description
Symbol
Pin
Description
DIP16, SO16
SSOP20
A0
1
6
address input 0
A1
2
7
address input 1
A2
3
9
address input 2
P0
4
10
quasi-bidirectional I/O 0
P1
5
11
quasi-bidirectional I/O 1
P2
6
12
quasi-bidirectional I/O 2
P3
7
14
quasi-bidirectional I/O 3
VSS
8
15
supply ground
P4
9
16
quasi-bidirectional I/O 4
P5
10
17
quasi-bidirectional I/O 5
P6
11
19
quasi-bidirectional I/O 6
P7
12
20
quasi-bidirectional I/O 7
INT
13
1
interrupt output (active LOW)
SCL
14
2
serial clock line
SDA
15
4
serial data line
VDD
16
5
supply voltage
n.c.
-
3, 8, 13, 18
not connected
a. PCA8574
b. PCA8574A
Fig 6.
PCA8574 and PCA8574A slave addresses
R/W
002aah469
0
1
0
A2
A1
A0
hardware
selectable
slave address
0
fixed
R/W
002aah470
0
1
A2
A1
A0
hardware
selectable
slave address
0
fixed
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