參數資料
型號: PCA9672D,512
廠商: NXP Semiconductors
文件頁數: 3/36頁
文件大?。?/td> 0K
描述: IC I/O EXPANDER I2C 8B 16SOIC
標準包裝: 48
接口: I²C
輸入/輸出數: 8
中斷輸出:
頻率 - 時鐘: 1MHz
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)
供應商設備封裝: 16-SO
包裝: 管件
包括: POR
其它名稱: 935282746512
PCA9672D
PCA9672D-ND
PCA9672
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 3 — 27 May 2013
11 of 36
NXP Semiconductors
PCA9672
Remote 8-bit I/O expander for Fm+ I2C-bus with interrupt and reset
8.2 Writing to the port (Output mode)
The master (microcontroller) sends the START condition and slave address setting the
last bit of the address byte to logic 0 for the write mode. The PCA9672 acknowledges and
the master then sends the data byte for P7 to P0 to the port register. As the clock line
goes HIGH, the 8-bit data is presented on the port lines after it has been acknowledged by
the PCA9672. If a LOW is written, the strong pull-down turns on and stays on. If a HIGH is
written, the strong pull-up turns on for 12 of the clock cycle, then the line is held HIGH by
the weak current source. The master can then send a STOP or ReSTART condition or
continue sending data. The number of data bytes that can be sent successively is not
limited and the previous data is overwritten every time a data byte has been sent and
acknowledged.
Ensure a logic 1 is written for any port that is being used as an input to ensure the strong
external pull-down is turned off.
Simple code for Write cycle:
<S> <slave address + W> <ACK> <DATA1> <ACK> <DATA2> <ACK> <DATA1> ...
<DATAn> <ACK> <P>
Fig 13. Write mode (output)
A5 A4 A3 A2 A1 A0
0
A
SA6
slave address
START condition
R/W
acknowledge
from slave
002aah623
P6
1
P7
data 1
A
acknowledge
from slave
12345678
SCL
9
SDA
A
acknowledge
from slave
write to port
data output from port
tv(Q)
P5
data 2
DATA 2 VALID
P4 P3 P2 P1 P0
P7
P4 P3 P2 P1 P0
P6
P5
0
tv(Q)
DATA 1 VALID
P5 output voltage
Itrt(pu)
IOH
P5 pull-up output current
trst(INT)
INT
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