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參數(shù)資料
| 型號： | PCA9515A |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | I2C-bus repeater |
| 中文描述： | I2C總線中繼器 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大小： | 116K |
| 代理商： | PCA9515A |
Philips Semiconductors
Product data sheet
PCA9515A
I
2
C-bus repeater
2004 Sep 29
4
APPLICATION INFORMATION
A typical application is shown in Figure 3. In this example, the
system master is running on a 3.3 V I
2
C-bus while the slave is
connected to a 5 V bus. Both buses run at 100 kHz unless the slave
bus is isolated and then the master bus can run at 400 kHz. Master
devices can be placed on either bus.
SW02245
BUS0
BUS
MASTER
400 kHz
SLAVE
100 kHz
PCA9515A
SDA
SDA0
SDA
SCL
SCL0
SCL
EN
BUS1
3.3 V
5 V
SDA1
SCL1
Figure 3. Typical application
The PCA9515A is 5 V tolerant so it does not require any additional
circuitry to translate between the different bus voltages.
When one side of the PCA9515A is pulled LOW by a device on the
I
2
C-bus, a CMOS hysteresis type input detects the falling edge and
causes an internal driver on the other side to turn on, thus causing
the other side to also go LOW. The side driven LOW by the
PCA9515A will typically be at V
OL
= 0.5 V.
In order to illustrate what would be seen in a typical application, refer
to Figures 4 and 5. If the bus master in Figure 3 were to write to the
slave through the PCA9515A, we would see the waveform shown in
Figure 4 on Bus 0. This looks like a normal I
2
C transmission until the
falling edge of the 8
th
clock pulse. At that point, the master releases
the data line (SDA) while the slave pulls it LOW through the
PCA9515A. Because the V
OL
of the PCA9515A is typically around
0.5 V, a step in the SDA will be seen. After the master has
transmitted the 9
th
clock pulse, the slave releases the data line.
9th CLOCK PULSE
V
OL
OF MASTER
V
OL
OF PCA9515A
2 V/DIV
SW02247
Figure 4. Bus 0 waveform
相關(guān)PDF資料 |
PDF描述 |
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| PCA9515 | I2C-bus repeater |
| PCA9516PW | 5-channel I2C hub |
| PCA9516 | 5-channel I2C hub |
| PCA9516D | 5-channel I2C hub |
| PCA9517 | Level translating I2C-bus repeater |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCA9515AD | 功能描述:接口-信號緩沖器、中繼器 Dual Bidir I2C Bus & SMBus Repeater RoHS:否 制造商:Texas Instruments 工作電源電壓: 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:VSSOP-8 封裝:Reel |
| PCA9515AD,112 | 功能描述:接口-信號緩沖器、中繼器 I2C BUS REPEATER RoHS:否 制造商:Texas Instruments 工作電源電壓: 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:VSSOP-8 封裝:Reel |
| PCA9515AD,118 | 功能描述:接口-信號緩沖器、中繼器 I2C BUS REPEATER RoHS:否 制造商:Texas Instruments 工作電源電壓: 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:VSSOP-8 封裝:Reel |
| PCA9515AD,118-CUT TAPE | 制造商:NXP 功能描述:PCA9515A Series 3.6 V 2-Channel Bidirectional Buffer I2C-bus repeater - SOIC - 8 |
| PCA9515AD | 制造商:Texas Instruments 功能描述:1WO-CHANNEL BIDIRECTIONAL ((NW)) |
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