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參數(shù)資料
| 型號： | PCA9546A |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 4-channel I2C switch with reset |
| 中文描述： | 4通道的I2C開關(guān)與復(fù)位 |
| 文件頁數(shù)： | 6/25頁 |
| 文件大?。?/td> | 144K |
| 代理商： | PCA9546A |
9397 750 14318
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 03 — 6 April 2005
6 of 25
Philips Semiconductors
PCA9546A
4-channel I
2
C switch with reset
7.2 Control register
Following the successful acknowledgement of the slave address, the bus master will send
a byte to the PCA9546A, which will be stored in the control register. If multiple bytes are
received by the PCA9546A, it will save the last byte received. This register can be written
and read via the I
2
C-bus.
7.2.1
Control register definition
One or several SCx/SDx downstream pair, or channel, is selected by the contents of the
control register. This register is written after the PCA9546A has been addressed. The
4 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.
Remark:
Several channels can be enabled at the same time. Example: B3 = 0, B2 = 1,
B1 = 1, B0 = 0, means that channel 0 and channel 3 are disabled and channel 1 and
channel 2 are enabled. Care should be taken not to exceed the maximum bus
capacitance.
Fig 6.
Control register
002aab190
X
X
X
X
B3
B2
B1
B0
channel selection bits
(read/write)
7
6
5
4
3
2
1
0
channel 0
channel 1
channel 2
channel 3
Table 4:
D7
Control register: Write—channel selection; Read—channel status
D5
D4
B3
B2
D6
B1
B0
0
1
Command
channel 0 disabled
channel 0 enabled
channel 1 disabled
channel 1 enabled
channel 2 disabled
channel 2 enabled
channel 3 disabled
channel 3 enabled
no channel selected;
power-up/reset default state
X
X
X
X
X
X
X
X
X
X
X
X
X
0
1
X
X
X
X
X
X
0
1
X
X
X
X
X
X
0
1
0
X
X
X
0
0
0
0
0
0
0
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| PCA9555N | 16-bit I2C and SMBus I/O port with interrupt |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCA9546A_1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4-CHANNEL I2C AND SMBus SWITCH WITH RESET FUNCTION |
| PCA9546A_2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4-CHANNEL I2C AND SMBus SWITCH WITH RESET FUNCTION |
| PCA9546A_3 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4-CHANNEL I2C AND SMBus SWITCH WITH RESET FUNCTION |
| PCA9546ABS | 制造商:NXP Semiconductors 功能描述: |
| PCA9546ABS,118 | 功能描述:多路器開關(guān) IC I2C SWITCH 4CH 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(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
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