TDA9989 Philips Semiconductors, TDA9989 Datasheet - Page 27

• Manufacturer Part Number: TDA9989
• Description: 150 MHz Pixel Rate HDMI 1.3a Transmitter
• Manufacturer: Philips Semiconductors

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TDA9989_2
Product data sheet
7.12.1.1 Digitally controlled signal amplitude
7.11.3 CEC interrupt
7.11.4 Power-On Reset (POR)
7.11.5 Repeater function
7.12.1 Output TMDS buffers
7.12.2 Pixel repetition
7.12 HDMI core
Non successful calibration will lead to CEC signal no matching timings specification as
consequence CEC not functional.
Pin INT_HDMI is used by the TDA9989 to warm the host processor HDMI or CEC events
(CEC message is available to read) have occurred.
Software reads interrupt status register determine which block between HDMI or CEC has
raised the interruption before processing it.
After power-up, the TDA9989 is activated by hard reset by POR module. This is used to
set the TDA9989 to a known state.
The TDA9989 can be used in a repeater device according to HDMI 1.3a.
The TMDS signal output peak-to-peak voltage (Vswing) is programmable by the software
using I
accuracy in 18 mV steps according to the following formula:
An external resistor (10 k
analog ground.
To transmit video formats with pixel rates below 25 megasamples per second or to
increase the number of audio sample packets in each frame, the TDA9989 uses pixel
repetition to increase the transmitted pixel clock (see
Table 20.
PR[3]
0
0
0
0
0
0
0
0
Vswing = 370 mV + 18 mV
2
C-bus register vswing_crtl[3:0]. Vswing varies from 370 mV to 640 mV with 5 %
Pixel repetition
PR[2]
0
0
0
0
1
1
1
1
Rev. 02 — 11 June 2009
PR[1]
0
0
1
1
0
0
1
1
1 %) must be connected between pin EXT_SWING and
vswing_ctrl[3:0]
PR[0]
0
1
0
1
0
1
0
1
HDMI 1.3a transmitter with CEC support
Table
Pixel repetition factor
no repetition: pixel sent once
2 times: pixel repeated once
3 times
4 times
5 times
6 times
7 times
8 times
20).
TDA9989
© NXP B.V. 2009. All rights reserved.
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