Silicon Image SiI9222

Mobile HD Link (MHL) Transmitter

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Key Features

The SiI9222 Mobile HD Link Transmitter facilitates the design of low pin count, low-power mobile HDMI-interoperable applications.

It implements the Mobile HD Link (MHL) standard to carry formatted video and audio to Mobile HD Link-capable receivers, using five pins on a mobile connector. Mobile HD Link signalling is readily converted to a standard HDMI compliant signal when needed. The SiI9222 transmitter also supports HDCP, for devices that require secure content delivery.

Silicon Image MHL products use the latest generation of TMDS core technology. With this ultra low-power solution, HD camcorders, digital still cameras, and personal mobile devices can connect to a large installed base of HDMI TVs.


The SiI9222 transmitter combined with an MHL capable receiver such as SiI9290 meets the HDMI 1.3 compliance test specification.

  • The transmitter sends all data over a single differential pair instead of three pairs, with the clocking signal superimposed over the data signal as a common mode signal
  • A single wire control bus supports all sideband signalling for DDC, CEC, HPD, and Receiver sense
  • The receiver converts received data to standard HDMI.

The transmitter supports 640 x 480, 480/576i, 480/576p, 720p/1080i, and all CEA resolutions in between (75MHz input, 225MHz at the link).

  • The RGB parallel interface supports HD MPEG decoders in DSCs and DVCs
  • 8/10/12-bit or 16/20/24-bit YCbCr 4:2:2
  • ITU-R BT.601/656, BTA-T1004 video input formats
  • 24-bit RGB/YCbCr 4:4:4
  • Colour space conversions between YCbCr and RGB
  • Input clock divider (0.5x, 2x, 4x)
  • Programmable DE generation and sync extraction
  • HDCP 1.2 content protection with pre-programmed keys for maximum security.

The SiI9222 Mobile HD Link Transmitter offers these additional features:

  • High-end digital audio interface
  • Two I2S (IEC60958 and IEC61937 compliant) input lanes supporting four audio channels
  • S/PDIF input supporting multi-channel (5.1) Dolby Digital, DTS, MPEG2 Audio, two channel PCM (32-192 kHz Fs sample rate)
  • MCLK generator for S/PDIF operation without external clock PLL; external MCLK optional
  • 2:1 and 4:1 down-sampling to handle 96 kHz and 192 kHz audio streams.
  • Consumer Electronics Control (CEC) hardware protocol and arbitration logic, software-compatible with other Silicon Image CEC products
  • Single slave I2C from host, for internal register access as well as remote DDC access MHL CTRL pin, simplifies board layout and lowers cost
  • Implements an advanced programming interface to eliminate over 90% of host processor firmware
  • Fully automatic calculation of S/PDIF audio CTS/N values
  • Complete self sequencing HDCP detection and authentication, including SHA-1 for repeaters
  • 1.2 V core consumes minimal power in both active and standby modes
  • 64-ball VFBGA package, 0.5 mm pitch, 5x5 mm footprint
  • Standard part covers extended (-20 to +85°C) temperature range.

Ordering Options

Part Number Package Tray size Brick size
SiI9222EBT 64-ball VFBGA 490 2450