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Solution bridges MDDI/CPU, MIPI

Posted: 03 Dec 2008 ?? ?Print Version ?Bookmark and Share

Keywords:solution bridge? MIPI MDDI/CPU? interface?

California Micro Devices has announced CM5160, a Mobile Display Digital Interface (MDDI)/CPU to Mobile Industry Processor Interface (MIPI) bridge solution, the first to enable conversion.

Given the two competing standards, one backed by the MIPI Alliance and the other endorsed by Qualcomm, the issue targeted by the CM5160 is that a majority of the top five handset companies purchase CPUs from a variety of manufacturers from both camps and are therefore dealing with both standards. The chip is a bridge solution that can convert a MDDI signal to a MIPI signal. For top-tier handset OEMs that split display module purchases between the two camps, it enables the purchase of displays under a single standard and takes advantage of greater volume discounts and fewer parts to qualify and place into inventory.

The CM5160 is the first solution that can make the conversion from MDDI to MIPI. There are three main use cases: MDDI (client) to MIPI (host) conversion; CPU interface to MIPI (host) conversion; and for those that wish to continue to buy under both standards, as a client supporting WQVGA 24bit MDDI client. The first two cases is standard conversion. The product sits next to the CPU and interfacing directly with the solution, taking the signal, converting it and providing a MIPI host function, becoming a MIPI transmitter, sending the MIPI signal to a display module. When used as an MDDI client, the device fits into the display module itself. The interface from the CPU to the display module will be a MDDI four-wire interface. The output is then 24bit RGB.

The device is a hub as well, enabling you to take a single input from a CPU whether Qualcomm or other processor, and support a primary and secondary display from the single chip. Primary display options are MIPI output to a MIPI display module, or an RGB output if in client mode, and MIPI if doing an MDDI to MIPI conversion.

Also included are on-chip RAM for display refresh, support for primary display resolutions to WQVGA 24 bits-per-pixel, an integrated PLL, and very low active power and power down modes of less than 15mW in typical applications and less than 10?A in standby.

The CM5160 has three main use cases: MDDI (client) to MIPI (host) conversion; CPU interface to MIPI (host) conversion; and for those that wish to continue to buy under both standards, as a client supporting WQVGA 24bit MDDI client.

The display controller is a 128-pin 0.4mm pitch WLCSP 11 x 12 array (4.5mm x 4.9mm). Samples and evaluation boards are now available with samples priced at $5.00 each for 3,000-piece quantities. Mass production is expected in April 2009.

- Carolyn Mathas
Mobile Handset DesignLine





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