參數(shù)資料
型號(hào)： PCA9674AN
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： Remote 8-bit I/O expander for Fm+ I2C-bus with interrupt
中文描述： 8 I/O, PIA-GENERAL PURPOSE, PDIP16
封裝： 0.300 INCH, PLASTIC, MO-001, SOT38-1, DIP-16
文件頁(yè)數(shù)： 18/34頁(yè)
文件大?。?/td> 179K
代理商： PCA9674AN
PCA9674_PCA9674A_2
NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 02 — 12 October 2006
18 of 34
NXP Semiconductors
PCA9674/74A
Remote 8-bit I/O expander for Fm+ I
2
C-bus with interrupt
10. Application design-in information
10.1 Bidirectional I/O expander applications
In the 8-bit I/O expander application shown in
Figure 21
, P0 and P1 are inputs, and P2 to
P7 are outputs. When used in this configuration, during a write, the input (P0 and P1)
must be written as HIGH so the external devices fully control the input ports. The desired
HIGH or LOW logic levels may be written to the I/Os used as outputs (P2 to P7). During a
read, the logic levels of the external devices driving the input ports (P0 and P1) and the
previous written logic level to the output ports (P2 to P7) will be read.
The GPIO also has an interrupt line (INT) that can be connected to the interrupt logic of
the microprocessor. By sending an interrupt signal on this line, the remote I/O informs the
microprocessor that there is incoming data or a change of data on its ports without having
to communicate via the I
2
C-bus.
10.2 High current-drive load applications
The GPIO has a maximum sinking current of 25 mA per bit. In applications requiring
additional drive, two port pins in the same octal may be connected together to sink up to
50 mA current. Both bits must then always be turned on or off together. Up to 8 pins (one
octal) can be connected together to drive 200 mA.
Fig 21. Bidirectional I/O expander application
002aac123
V
DD
temperature sensor
battery status
control for latch
control for switch
control for audio
control for camera
control for MP3
P0
P1
P2
P3
P4
P5
P6
P7
V
DD
SDA
SCL
INT
AD0
AD1
AD2
CORE
PROCESSOR
V
DD
Fig 22. High current-drive load application
002aac124
V
DD
P0
P1
P2
P3
P4
P5
P6
P7
V
DD
SDA
SCL
INT
AD0
AD1
AD2
CORE
PROCESSOR
V
DD
LOAD
相關(guān)PDF資料
PDF描述
PCA9674ATS Remote 8-bit I/O expander for Fm+ I2C-bus with interrupt
PCA9674N Remote 8-bit I/O expander for Fm+ I2C-bus with interrupt
PCA9674TS Remote 8-bit I/O expander for Fm+ I2C-bus with interrupt
PCA9674 Remote 8-bit I/O expander for Fm+ I2C-bus with interrupt
PCA9674A Remote 8-bit I/O expander for Fm+ I2C-bus with interrupt
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PCA9674APW 功能描述:接口-I/O擴(kuò)展器 8-BIT I2C FM+ QB GPIO RST PU RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel
PCA9674APW,112 功能描述:接口-I/O擴(kuò)展器 8-BIT I2C FM+ QB RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel
PCA9674APW,118 功能描述:接口-I/O擴(kuò)展器 8-BIT I2C FM+ QB RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel
PCA9674APW,118-CUT TAPE 制造商:NXP 功能描述:PCA9674 Series 5.5 V ?00 mA Remote 8 bit I/O Expander Fm+I2C bus - TSSOP-16
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