In the early phase, the LED Driver IC was without error detection function.

When the super highway's LED Display Planel occurred short-circuit error data (one or several LED lines didn't light up), it was inconvenient to maintain and might cause the traffic safety problem. For the sake of this reason, the real-time error detection and read back funtion was made a regulation in highway LED Display specification.

While it also requires the real-time error detection and read back function for the LED Display Panel in remote districs for easy to maintain. Even for the outdoor high quality LED full color Display Panel, real-time error dectiontion and read back function is increaingly to be valued. MBI5027 is the exclusive LED Driver IC with real-time error detection and read back function in the current market.

MBI5027, stemmed on MBI5026, not only for the existing function of MBI5026, but also provides Error Detection fucntion with legacy IC footprint and no need to add any footprint.

While MBI5027 entering the Error Detection Mode, the Detection Data inputs through SDI, and merely two microseconds (2μs) to detect the error, after finishing the detection and the erroneous state will be read from the system controller; then the image data can be shfited into SDI. The read Detection Data is shifted from each SDO to next SDI, the Error Status code in the Shift Register will be shifted out to SDO and thus read by the system controller. Therefore, the Error Data will not be shifted to the input.

Please refer to Fig.1. Error Detection Fucntion Diagram.

Fig. 1. Error Detection Function Diagram

MBI5027 stemmed on MBI5026 which offers value-added LED open-circuit error dection function. In several pulic facilities, the availability of the display panel is severely required. At the first moment of the dipsplay error, the system has to be alerted and the system administrator may call for a fix.

MBI5027 provides a feature of LED Open-circuit Error Detection function. MB5027 has a built-in current detection circuitry which detects the individual current of each output port, when some of LED are open-circuit, the erroneous state will be stored and to be read from the system controller.

The error detection could be enabled and disabled by a simple modified sequence of the lagacy control signal pins, OE, LED and CLK. Furthremore, MBI5027 exploits Share-I-O™ technique, which utilizes the data path to pass the error code as well as the image data. The error code passes through legacy signal pin SDO to the system controller without extra pins.

MBI5027 could be a drop-in replacement of MBI5026. The printed circuit board originally designed for MBI5026 is also applicable to MBI5027.

Please refer to the Fig. 2 MBI5027 Block Diagram

Fig. 2. Block Diagram

The other brand of LED Driver IC with Error Detection can merely provide "Chip-Status Report" which means the IC only detects the Error Data occurred by which IC, but it can't show this Error Data is occurred by which Channel of IC. It will be needed to detect each footprint of IC by sending 16 times data (multiple pass scans) to know which of the Error happens.

MBI5027 exclusively provides "real-time individual LED status report" which means MBI5027 can detect where the Error is occurred by which Channel of IC and to make real-time read back. The error code can identify the individual LED error simultaneously, that is, no multiple pass scans are required.