MBI5027 查看數據表（PDF） - Unspecified

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MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

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MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Product Description

MBI5027 succeeds MBI5026 and is designed for LED displays with open-circuit Error Detection

extension. MBI5027 exploits PrecisionDrive™ technology to enhance its output characteristics.

MBI5027 contains a serial buffer and data latches, which convert serial input data into parallel

output format. At MBI5027 output stage, sixteen regulated current ports are designed to provide

uniform and constant current sinks for driving LEDs within a wide range of Vf variations.

While MBI5027 is used in their system design for LED display applications, e.g. LED panels, it

provides users with great flexibility and device performance. Users may adjust the output

current from 5 mA to 90 mA through an external resistor, Rext, which gives users flexibility in

controlling the light intensity of LEDs. MBI5027 guarantees to endure maximum 17V at the

output port. The high clock frequency, 25 MHz, also satisfies the system requirements of high

volume data transmission.

MBI5027 exploits the idea of Share-I-O™ technology to extend its performance；in addition,

MBI5027 is backward compatible with MBI5026 in both electrical characteristics and package

aspect. With Share-I-O™ technology, users can, without changing the printed circuit board

originally for MBI5026, let MBI5027 enter a special function mode, an Error Detection mode,

just by setting a sequence of signals on LE(ED1), OE (ED2) and CLK input pins. In the Error

Detection mode, MBI5027 detects the status of individual LED connected to MBI5027. The

status will be saved in a built-in register. Then, a system controller may read, through SDO pin,

the error status from the register to know whether LEDs are properly lit or not. By setting

another sequence of signals on LE(ED1), OE (ED2) and CLK input pins, MBI5027 may resume

to a Normal mode and perform as MBI5026. In Application Information, users can get

detailed ideas about how MBI5027 works in the Error Detection mode.

A Share-I-O™ technique is specifically applied to MBI5027. By means of the Share-I-O™

technique, an additionally effective function, Error Detection, can be added to LED drivers,

however, without any extra pins. Thus, MBI5027 could be a drop-in replacement of MBI5026.

The printed circuit board originally designed for MBI5026 may be also applicable for MBI5027.

For MBI5027, the pin 4, LE(ED1), and the pin 21, OE (ED2), can be acted as different functions

as follows:

Pin

Device Name

MBI5027

Function Description of Pin 4

LE + Error Detection (ED1)

Function Description of Pin 21

OE + Error Detection (ED2)

-2-

April 2003, V0.8-4

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