TDA9981B NXP Semiconductors, TDA9981B Datasheet - Page 22

• Manufacturer Part Number: TDA9981B
• Description: HDMI transmitter up to 150 MHz pixel rate
• Manufacturer: NXP Semiconductors

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9. I
TDA9981B_1
Product data sheet
2
C–bus register definitions
8.15 I
9.1 I
As long as the receiver is connected to the transmitter and powered up, bit RXS_FIL is set
to logic 1.
When the cable is unplugged or the receiver site is powered off (assuming in this case
that V
changing the value of bit RXS_FIL to logic 0. This allows the application to stop sending
unnecessary video content.
This feature is very useful when the receiver has recovered from an off state and does not
generate an HPD HIGH-to-LOW-to-HIGH transition. In this particular case, RxSense will
generate an interrupt so that the TDA9981B restarts sending video.
Remark: According to the HDMI specification, only the HPD interrupt allows the
application to read the EDID. It is not mandatory to use RxSense to initialize the EDID
reading procedure.
The I
(400 kHz).
The registers of the TDA9981B can be accessed via the I
as a slave device and both the fast mode 400 kHz and the standard mode 100 kHz are
supported.
Bits A0 and A1 of the I
The I
Table 17.
The I
Device address
A6
1
2
2
Fig 12. Receiver sensitivity detection
C-bus interface
C-bus protocol
2
2
2
DD
C-bus pins I2C_SDA and I2C_SCL are 5 V tolerant and can work at fast mode
C-bus device address is given in
C-bus access format is shown in
is switched off), the RxSense generates an interrupt inside the TDA9981B,
A5
1
Device address
A4
1
2
C-bus device address are externally selected by pins A0 and A1.
TRANSMITTER
Rev. 01 — 4 July 2008
D
A3
0
D
Table
Figure
A2
0
Z
17.
0
13.
150 MHz pixel rate HDMI transmitter
A1
A1
RECEIVER
R T
2
C-bus. The TDA9981B is used
001aag601
R T
V
DDA
TDA9981B
A0
A0
© NXP B.V. 2008. All rights reserved.
R/W
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1/0
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