參數(shù)資料
型號(hào): PCA9574PW,118
廠商: NXP Semiconductors
文件頁數(shù): 30/33頁
文件大小: 0K
描述: IC I/O EXPANDER I2C 8B 16TSSOP
特色產(chǎn)品: NXP - I2C Interface
標(biāo)準(zhǔn)包裝: 1
接口: I²C,SM 總線
輸入/輸出數(shù): 8
中斷輸出:
頻率 - 時(shí)鐘: 400kHz
電源電壓: 1.1 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 16-TSSOP
包裝: 標(biāo)準(zhǔn)包裝
包括: POR
其它名稱: 568-8714-6
PCA9574
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 4 — 25 April 2012
6 of 33
NXP Semiconductors
PCA9574
8-bit I2C-bus and SMBus, level translating, low volage GPIO
6.2 Pin description
[1]
HVQFN16 package die supply ground is connected to both VSS pin and exposed center pad. VSS pin must be connected to supply
ground for proper device operation. For enhanced thermal, electrical, and board level performance, the exposed pad needs to be
soldered to the board using a corresponding thermal pad on the board and for proper heat conduction through the board, thermal vias
need to be incorporated in the PCB in the thermal pad region.
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
PCA9574 is shown in Figure 6. Slave address pin A0 chooses 1 of 2 slave addresses:
40h or 42h.
The last bit of the first byte defines the operation to be performed. When set to logic 1 a
read is selected, while logic 0 selects a write operation.
Table 3.
Pin description
Symbol
Pin
Type
Description
TSSOP16
HVQFN16
XQFN16
INT
1
15
O
active LOW interrupt output;
active LOW SMBus alert output
A0
2
16
I
address input
RESET
311I
active LOW reset input
P0
422I/O
input/output 0
P1
533I/O
input/output 1
P2
644I/O
input/output 2
P3
755I/O
input/output 3
VSS
86[1]
6
ground
supply ground
VDD(IO)
9
7
power supply
I/O bank supply voltage
P4
10
8
I/O
input/output 4
P5
11
9
I/O
input/output 5
P6
12
10
I/O
input/output 6
P7
13
11
I/O
input/output 7
SCL
14
12
I
serial clock line
SDA
15
13
I/O
serial data line
VDD
16
14
power supply
supply voltage
Fig 6.
PCA9574 device address
002aad055
0
1
0
A0 R/W
fixed
slave address
hardware selectable
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