Datasheet

PCA9527_1 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 01 — 29 June 2009 8 of 22
NXP Semiconductors
PCA9527
3-channel bidirectional bus extender for HDMI, I
2
C-bus and SMBus
7. Application design-in information
A typical application is shown in Figure 5. 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 400 kHz.
Master devices can be placed on either bus. HDMI DDC applications for DVD/R and
LCD TV are shown in Figure 6 and Figure 7, respectively. In these applications the HDMI
transmitter or receiver is 3.3 V, while the DDC line is 5 V, PCA9527 behaves like a voltage
level shift, a buffer and long cable bus extender to ensure signal integrity for accessing the
EDID on the DDC line.
Fig 5. Typical application
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V
CC(A)
V
CC(B)
PCA9527
SDAB SDAA
SCLB SCLA
EN
10 kΩ
SDA
SCL
BUS
MASTER
400 kHz
SLAVE
400 kHz
SDA
SCL
bus B bus A
5 V
3.3 V
10 kΩ
10 kΩ
CECB CECA
10 kΩ
10 kΩ
10 kΩ
INTR or RESET INTR or RESET
Fig 6. Source or DVD/R, STB application
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V
CC(A)
V
CC(B)
SDAB SDAA
SCLB SCLA
2.7 kΩ
10 kΩ
(optional)
GND
10 kΩ
CECB
3.3 V
0.1 µF
10 kΩ
HDMI
TRANSMITTER
PCA9527
0.1 µF
1.5 kΩ
to
2.0 kΩ
(2×)
5 V
HDMI cable
DDC line
LCD TV (sink)
PCA9507
PCA9512A
PCA9515
PCA9517
PCA9527
DVD/R or STB
22 Ω
EN
10 kΩ
CECA
22 Ω