TDA19989 NXP Semiconductors, TDA19989 Datasheet - Page 27

• Manufacturer Part Number: TDA19989
• Description: 150 MHz pixel rate HDMI 1.3 transmitter
• Manufacturer: NXP Semiconductors

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NXP Semiconductors
TDA19989_1
Preliminary data sheet
7.13.1.1 Digitally controlled signal amplitude
7.12.4 Power-On Reset (POR)
7.12.5 Repeater function
7.13.1 Output TMDS buffers
7.13.2 Pixel repetition
7.13.3 DDC-bus channel
7.13 HDMI core
After power-up, TDA19989 is activated by internal reset from POR module. This is used to
set TDA19989 to a known state.
TDA19989 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 kΩ ± 1 %) must be connected between pin EXT_SWING and
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, TDA19989 uses pixel
repetition to increase the transmitted pixel clock (see
Table 20.
The DDC-bus pins DSDA and DSCL are 5 V tolerant and can work at standard mode
(100 kHz). The DDC-bus is used as a master interface when reading the EDID.
When the device is power-off, DSDA and DSCL ports:
PR[3]
0
0
0
0
0
0
0
0
1
1
others
•
•
Vswing = 370 mV + 18 mV × vswing_ctrl[3:0]
become in high-impedance
can withstand 5 V from the sink
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
0
0
Rev. 01 — 15 February 2010
PR[1]
0
0
1
1
0
0
1
1
0
0
HDMI 1.3 transmitter with HDCP and CEC support
PR[0]
0
1
0
1
0
1
0
1
0
1
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
9 times
10 times
reserved
20).
TDA19989
© NXP B.V. 2010. All rights reserved.
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