Datasheet

PCA9507_1 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 01 — 7 February 2008 7 of 20
NXP Semiconductors
PCA9507
2-wire serial bus extender for HDMI DDC I
2
C-bus and SMBus
7. Application design-in information
A typical application is shown in Figure 6. 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 7 and Figure 8, respectively. In these applications the HDMI
transmitter or receiver is 3.3 V, while the DDC line is 5 V, PCA9507 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 6. Typical application
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V
CC(A)
V
CC(B)
PCA9507
SDAB SDAA
SCLB SCLA
EN
10 kΩ 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
Fig 7. Source or DVD/R, STB application
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V
CC(A)
V
CC(B)
SDAB SDAA
SCLB SCLA
1.5 kΩ
to
2.0 kΩ
10 kΩ
(optional)
GND
10 kΩ
EN
3.3 V
0.1 µF
10 kΩ
HDMI
TRANSMITTER
PCA9507
0.1 µF
1.5 kΩ
to
2.0 kΩ
5 V
HDMI cable
DDC line
LCD TV (sink)
PCA9507
PCA9512A
PCA9517
PCA9515
DVD/R or STB
22 Ω
22 Ω
Fig 8. Sink or LCD TV application
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V
CC(A)
V
CC(B)
SDAB SDAA
SCLB SCLA
10 kΩ
(optional)
GND
10 kΩ
EN
3.3 V
0.1 µF
10 kΩ
HDMI
RECEIVER
PCA9507
0.1 µF
47 kΩ
5 V
HDMI cable
DDC line
DVD (source)
PCA9507
PCA9512A
PCA9517
PCA9515
LCD TV
22 Ω
22 Ω