TDA19997HL NXP Semiconductors, TDA19997HL Datasheet - Page 8

• Manufacturer Part Number: TDA19997HL
• Description: Smart Hdmi 1.4 4 1 Switch With Auto-adaptive Equalizer
• Manufacturer: NXP Semiconductors

NXP Semiconductors
8. Functional description
TDA19997HL_2
Product data sheet
8.1 HDMI input
8.2 Equalizer
8.3 Activity detection
8.4 Embedded EDID memory
[1]
The TDA19997HL is a DVI/HDMI switch comprising four DVI/HDMI inputs and one output
optimized for Hi-Speed TMDS data. All inputs meet HDMI compliance tests and include a
built-in auto-adaptive input equalizer. The TDA19997HL includes an activity detection
module and Hot Plug Detect management.
In addition, the TDA19997HL stores the Extended Display Identification Data (EDID) for
each input in the built-in EDID memory. Full DDC-bus functionality is provided by the
TDA19997HL, including level-shifting.
The TDA19997HL supports bit rate inputs up to 2.25 Gbit/s enabling high frame rate
formats such as 1080p60, 1080i120 and 720p120 in 36-bit Deep Color mode.
The termination resistor control (R12K) needs an external resistor of 12 kΩ ± 1 %.
The termination resistor can be disconnected from the 3.3 V supply to remove the
common-mode voltage via the I
The input equalizer is fully auto-adaptive, needing no external control. Signals from short
cables with very low TMDS clock frequencies (20 MHz) to long cables (up to 20 m) at high
TMDS clock frequencies (225 MHz) are easily managed by the TDA19997HL’s equalizer.
When activity is detected, the output is automatically activated. If no input activity is
detected, the output is disabled to avoid false detections by the HDMI receiver. The power
consumption is reduced accordingly. The detection range is fixed by I
output can be used to indicate any activity change.
The size of the EDID memory is 253-byte shared and 3-byte dedicated for each input. The
memory can be accessed by each input at the same time.
EDID content programming is performed using the non-volatile memory. The EDID
memory can be powered by +5 V from the source or directly from the PCB using the
dedicated AUX_5V pin. In Power-down mode, the EDID memory remains active and it is
possible to modify its content. Access from pins RXx_DDC_DAT and RXx_DDC_CLK is
independent of other supplies. Consequently, the source has access to the EDID memory
when TDA19997HL is not powered.
Content can be modified using the I
must be powered by the 1.8 V supply from pin CDEC_DDC or the AUX_5V auxiliary
supply pin.
•
P = power supply; G = ground; I = input and O = output; I/O = input/output.
In I
value depends on internal oscillator accuracy.
2
C-bus mode: the TMDS frequency can be read, however, the precision of the
Rev. 02 — 22 December 2009
Smart HDMI 1.4 (4 : 1) switch with auto-adaptive equalizer
2
C-bus and/or when RXx_HPD is LOW.
2
C-bus. However, data modified using the I
TDA19997HL
2
C-bus. An interrupt
© NXP B.V. 2009. All rights reserved.
2
C-bus
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