參數(shù)資料
型號(hào): PCA9515AD
廠商: NXP Semiconductors N.V.
元件分類: I2C/I2S
英文描述: I2C-bus repeater
封裝: PCA9515AD<SOT96-1 (SO8)|<<http://www.nxp.com/packages/SOT96-1.html<1<week 5, 2005,;PCA9515AD<SOT96-1 (SO8)|<<http://www.nxp.com/packages/SOT96-1.html<1<week 5, 2005
文件頁(yè)數(shù): 5/18頁(yè)
文件大?。?/td> 104K
代理商: PCA9515AD
PCA9515A_4
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 04 — 11 April 2008
5 of 18
NXP Semiconductors
PCA9515A
I
2
C-bus repeater
7.
Application design-in information
A typical application is shown in
Figure 4
. 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.
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 the 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
Figure 5
and
Figure 6
. If the bus master in
Figure 4
were to write to the slave through the PCA9515A,
we would see the waveform shown in
Figure 5
on bus 0. This looks like a normal I
2
C-bus
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 round 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.
On the bus 1 side of the PCA9515A, the clock and data lines would have a positive offset
from ground equal to the V
OL
of the PCA9515A. After the 8
th
clock pulse the data line will
be pulled to the V
OL
of the slave device, which is very close to ground in this example. It is
important to note that any arbitration or clock stretching events on bus 1 require that the
V
OL
of the PCA9515A (see V
OL
V
ILc
in
Section 9 “Static characteristics”
) to be recognized
by the PCA9515A and then transmitted to bus 0.
Fig 4.
Typical application
002aad739
V
CC
PCA9515A
SDA0
SDA1
SCL0
SCL1
EN
10 k
10 k
SDA
SCL
BUS
MASTER
400 kHz
SLAVE
100 kHz
SDA
SCL
bus 0
bus 1
5 V
3.3 V
10 k
10 k
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PCA9515AD,112 功能描述:接口-信號(hào)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(fēng)格:SMD/SMT 封裝 / 箱體:VSSOP-8 封裝:Reel
PCA9515AD,118 功能描述:接口-信號(hào)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(fēng)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))
PCA9515AD/G,118 制造商:NXP Semiconductors 功能描述:Tape & Reel