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參數(shù)資料
| 型號： | PCA9544A |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 4-channel IC multiplexer with interrupt logic |
| 中文描述： | 4通道多路轉(zhuǎn)換器集成電路的中斷邏輯 |
| 文件頁數(shù)： | 4/23頁 |
| 文件大?。?/td> | 578K |
| 代理商： | PCA9544A |
www.ti.com
Device Address
Following a start condition, the bus master must output the address of the slave it is accessing. The address of
the PCA9544A is shown in
Figure 1
. To conserve power, no internal pullup resistors are incorporated on the
hardware-selectable address pins, and they must be pulled high or low.
1
1
1
0
A1
A2
A0
Slave Address
R/W
Fixed
Hardware
Selectable
Control Register
Following the successful acknowledgment of the slave address, the bus master sends a byte to the PCA9544A,
which is stored in the control register. If multiple bytes are received by the PCA9544A, it saves the last byte
received. This register can be written and read via the I
2
C bus.
Interrupt Bits
(Read Only)
Channel-Selection Bits
(Read/Write)
Enable Bit
INT3 INT2 INT1
INT0
B2
B1
B0
7
6
5
4
3
2
1
0
X
INT1
INT3
INT2
INT0
Control Register Definition
One or several SCn/SDn downstream pairs, or channels, are selected by the contents of the control register (see
Table 1
). This register is written after the PCA9544A has been addressed. The three LSBs of the control byte are
used to determine which channel (or channels) is to be selected. When a channel is selected, the channel
becomes active after a stop condition has been placed on the I
2
C bus. This ensures that all SCn/SDn lines are in
a high state when the channel is made active, so that no false conditions are generated at the time of
connection. A stop condition always must occur right after the acknowledge cycle.
PCA9544A
4-CHANNEL I
2
C AND SMBus MULTIPLEXER
WITH INTERRUPT LOGIC
SCPS146A–OCTOBER 2005–REVISED OCTOBER 2005
Figure 1. PCA9544A Address
The last bit of the slave address defines the operation to be performed. When set to a logic 1, a read is selected,
while a logic 0 selects a write operation.
Figure 2. Control Register
4
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PCA9544ADWT | 4-CHANNEL IC AND SMBus MULTIPLEXER WITH INTERRUPT LOGIC |
| PCA9544ARGWR | 4-CHANNEL IC AND SMBus MULTIPLEXER WITH INTERRUPT LOGIC |
| PCC | Programmable Capacitor Chips |
| PCC510-04OM | Programmable Capacitor Chips |
| PCC510-05OM | Programmable Capacitor Chips |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 傳播延遲時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| PCA9544ABS118 | 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
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