參數(shù)資料
型號(hào): PCA8574D,518
廠商: NXP Semiconductors
文件頁數(shù): 28/32頁
文件大小: 0K
描述: IC I/O EXPANDER I2C 8B 16SOIC
標(biāo)準(zhǔn)包裝: 1,000
接口: I²C
輸入/輸出數(shù): 8
中斷輸出:
頻率 - 時(shí)鐘: 400kHz
電源電壓: 2.3 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 16-SO
包裝: 帶卷 (TR)
包括: POR
其它名稱: 935283485518
PCA8574D-T
PCA8574D-T-ND
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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