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參數(shù)資料
| 型號： | PCA9544 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 4-channel IIC multiplexer and interrupt controller(4通道IIC多路復用器和中斷控制器) |
| 中文描述： | 4通道復用器和國際進口中斷控制器（4通道進口證多路復用器和中斷控制器） |
| 文件頁數(shù)： | 4/12頁 |
| 文件大?。?/td> | 77K |
| 代理商： | PCA9544 |
Philips Semiconductors
Product specification
PCA9544
4-channel I
2
C multiplexer and interrupt controller
1999 Oct 07
4
CHANNEL SELECTION
A SC0x/SD0x downstream pair, or channel, is selected by the
contents of the control register. This register is written after the
PCA9544 has been addressed. The 3 LSBs of the control byte are
used to determine which channel is to be selected. When a channel
is selected, the channel will become active after a stop condition has
been placed on the I
2
C bus. This ensures that all SCx/SDx lines will
be in a HIGH state when the channel is made active, so that no
false conditions are generated at the time of connection.
CONTROL BYTE
SELECTED
CHANNEL
7
X
X
X
X
X
6
X
X
X
X
X
5
X
X
X
X
X
4
X
X
X
X
X
3
X
X
X
X
X
2
0
1
1
1
1
1
X
0
0
1
1
0
X
0
1
0
1
none
0 (SC0/SD0)
1 (SC1/SD1)
2 (SC2/SD2)
3 (SC3/SD3)
CONTROL REGISTER
INT2 INT1 INT0
B2
B1 B0
Channel select bits
(read/write)
Interrupt bits
(read only)
INT3
SW00386
X
6
5
4
2
1
0
7
3
POWER-ON RESET
During power-up, the control register defaults to all zeroes causing
all the channels to be deselected.
INTERRUPT HANDLING
The PCA9544 provides 4 interrupt inputs, one for each channel and
one open drain interrupt output. When an interrupt is generated by any
device, it will be detected by the PCA9544 and the interrupt output
will be driven LOW. The channel need not be active for detection of
the interrupt. A bit is also set in the control byte. Bits 4 – 7 of the
control byte correspond to channels 0 – 3 of the PCA9544,
respectively. Therefore, if an interrupt is generated by any device
connected to channel 2, then bit 6 will be set in the control register.
Likewise, an interrupt on any device connected to channel 3 would
cause bit 7 of the control register to be set. The master can then
address the PCA 9544 and read the contents of the control byte to
determine which channel contains the device generating the interrupt.
The master can then reconfigure the PCA9544 to select this
channel, and locate the device generating the interrupt and clear it.
The interrupt clears when the device originating the interrupt clears.
It should be noted that more than one device can be providing an
interrupt on a channel, so it is up to the master to ensure that all
devices on a channel are interrogated for an interrupt.
7
6
5
4
3
2
1
0
INTERRUPTING
CHANNEL
0 (SC0/SD0)
1 (SC1/SD1)
2 (SC2/SD2)
3 (SC3/SD3)
0
0
0
1
0
0
1
0
0
1
0
0
1
0
0
0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PCA9546A | 4-channel I2C switch with reset |
| PCA9546 | 4-channel I2C switch with reset |
| PCA9546D | 4-channel I2C switch with reset |
| PCA9546PW | 4-channel I2C switch with reset |
| PCA9549 | Octal bus switch with individually I2C-bus controlled enables |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCA9544A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4-CHANNEL I2C AND SMBus MULTIPLEXER WITH INTERRUPT LOGIC |
| PCA9544A_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4-CHANNEL I2C AND SMBus MULTIPLEXER WITH INTERRUPT LOGIC |
| PCA9544A_09 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:4-channel I2C-bus multiplexer with interrupt logic |
| PCA9544ABS | 制造商:NXP Semiconductors 功能描述: |
| PCA9544ABS,118 | 功能描述:多路器開關(guān) IC 4-CH I2C MUX W/INTERRUPT RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16 |
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