參數(shù)資料
型號(hào)： PCA9549
廠商： NXP Semiconductors N.V.
英文描述： Octal bus switch with individually I2C-bus controlled enables
中文描述： 個(gè)別八路與I2C總線開(kāi)關(guān)，總線控制，使
文件頁(yè)數(shù)： 5/24頁(yè)
文件大小： 126K
代理商： PCA9549
PCA9549_1
Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 01 — 11 July 2006
5 of 24
Philips Semiconductors
PCA9549
Octal bus switch with individually I
2
C-bus controlled enables
6.
Functional description
6.1 Device addressing
Following a START condition, the bus master must output the address of the slave it is
accessing. The address of the PCA9549 is shown in
Figure 5
. To conserve power, no
internal pull-up resistors are incorporated on the hardware selectable address pins and
they must be pulled HIGH or LOW.
The last bit of the slave address defines the operation to be performed. When set to
logic 1 a read is selected, while a logic 0 selects a write operation.
6.2 Control register
Following the successful acknowledgement of the slave address, the bus master will send
a byte to the PCA9549, which will be stored in the Control register. If multiple bytes are
received by the PCA9549, it will save the last byte received. This register can be written
and read via the I
2
C-bus.
6.2.1
Control register definition
One or several bits are selected by the contents of the Control register. This register is
written after the PCA9549 has been addressed. The entire control byte is used to
determine which bit is to be selected. When a bit is selected to close, the bit will close
after the Acknowledge has been placed on the I
2
C-bus.
Fig 5.
Slave address
002aaa962
1
1
1
0
A2
A1
A0 R/W
fixed
hardware
selectable
Fig 6.
Control register
002aab254
B7
B6
B5
B4
B3
B2
B1
B0
channel selection bits
(read/write)
7
6
5
4
3
2
1
0
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7
bit 8
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCA9549BS 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Octal bus switch with individually I2C-bus controlled enables
PCA9549BS,118 功能描述:數(shù)字總線開(kāi)關(guān) IC 8-BIT I2C BUS SWITCH RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:24 傳播延遲時(shí)間:0.25 ns 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TSSOP-56 封裝:Reel
PCA9549BS-T 功能描述:數(shù)字總線開(kāi)關(guān) IC 8-BIT I2C BUS SWITCH W/RESET RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:24 傳播延遲時(shí)間:0.25 ns 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TSSOP-56 封裝:Reel
PCA9549D 功能描述:數(shù)字總線開(kāi)關(guān) IC 8-BIT I2C BUS SWITCH W/RESET RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:24 傳播延遲時(shí)間:0.25 ns 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TSSOP-56 封裝:Reel
PCA9549D,112 功能描述:數(shù)字總線開(kāi)關(guān) IC 8-BIT I2C BUS SWITCH RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:24 傳播延遲時(shí)間:0.25 ns 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TSSOP-56 封裝:Reel
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