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參數資料
| 型號： | PCA9544ADWT |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 4-CHANNEL IC AND SMBus MULTIPLEXER WITH INTERRUPT LOGIC |
| 中文描述： | 4通道多路轉換集成電路和SMBus與中斷邏輯 |
| 文件頁數： | 6/23頁 |
| 文件大?。?/td> | 578K |
| 代理商： | PCA9544ADWT |
www.ti.com
Power-On Reset
When power is applied to V
CC
, an internal power-on reset holds the PCA9544A in a reset condition until V
CC
has
reached V
. At this point, the reset condition is released, and the PCA9544A registers and I
2
C state machine
are initialized to their default states, all zeroes, causing all the channels to be deselected. Thereafter, V
CC
must
be lowered below 0.2 V to reset the device.
Voltage Translation
The pass-gate transistors of the PCA9544A are constructed such that the V
CC
voltage can be used to limit the
maximum voltage that is passed from one I
2
C bus to another.
2
Maximum
Typical
Minimum
V
CC
(V)
4.5
4
3.5
3
2.5
5
5.5
1
5
4.5
4
3.5
3
2.5
2
1.5
V
p
I
2
C Interface
The I
2
C bus is for two-way two-line communication between different ICs or modules. The two lines are a serial
data line (SDA) and a serial clock line (SCL). Both lines must be connected to a positive supply via a pullup
resistor when connected to the output stages of a device. Data transfer can be initiated only when the bus is not
busy.
PCA9544A
4-CHANNEL I
2
C AND SMBus MULTIPLEXER
WITH INTERRUPT LOGIC
SCPS146A–OCTOBER 2005–REVISED OCTOBER 2005
Figure 3
shows the voltage characteristics of the pass-gate transistors (note that the graph was generated using
data specified in the electrical characteristics section of this data sheet). In order for the PCA9544A to act as a
voltage translator, the V
pass
voltage must be equal to or lower than the lowest bus voltage. For example, if the
main bus is running at 5 V and the downstream buses are 3.3 V and 2.7 V, V
must be equal to or below 2.7 V
to effectively clamp the downstream bus voltages. As shown in
Figure 3
, V
pass
(max) is at 2.7 V when the
PCA9544A supply voltage is 3.5 V or lower, so the PCA9544A supply voltage could be set to 3.3 V. Pullup
resistors then can be used to bring the bus voltages to their appropriate levels (see
Figure 12
).
Figure 3. V
pass
Voltage vs V
CC
One data bit is transferred during each clock pulse. The data on the SDA line must remain stable during the high
period of the clock pulse, as changes in the data line at this time are interpreted as control signals (see
Figure 4
).
6
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相關代理商/技術參數 |
參數描述 |
|---|---|
| PCA9544AGQNR | 功能描述:多路器開關 IC 4-Ch I2C & SMBus Multiplexer RoHS:否 制造商:Texas Instruments 通道數量:1 開關數量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關閉時間（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 |
| PCA9544APW | 功能描述:多路器開關 IC 4-Ch I2C & SMBus Multiplexer RoHS:否 制造商:Texas Instruments 通道數量:1 開關數量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關閉時間（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 |
| PCA9544APW,112 | 功能描述:多路器開關 IC I2C MUX 4CH BI-DIR RoHS:否 制造商:Texas Instruments 通道數量:1 開關數量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關閉時間（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 |
| PCA9544APW,118 | 功能描述:多路器開關 IC 4-CH I2C MUX W/INTERRUPT RoHS:否 制造商:Texas Instruments 通道數量:1 開關數量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關閉時間（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 |
| PCA9544APW,118-CUT TAPE | 制造商:NXP 功能描述:PCA9544A Series 4-Channel I2C-Bus Multiplexer with Interrupt Logic - TSSOP - 20 |
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