MBI5171CN datasheet, PDF - EEWORLD Datasheet

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MBI5171CN: Description8-Bit Constant Current LED Driver with LED Error Detection and Run-Time Current Adjustment; File Size511KB，31 Pages; ManufacturerETC

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MBI5171CN Overview

8-Bit Constant Current LED Driver with LED Error Detection and Run-Time Current Adjustment

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Macroblock

Datasheet

MBI5171

8-Bit Constant Current LED Driver with

LED Error Detection and Run-Time Current Adjustment

Features

Compatible with MBI5168 in electrical characteristics and package

Exploiting

Share-I-O™

technique to provide two operation modes:

- Normal Mode with the same functionality as MB5168

- Special Mode to detect individual LED errors, like MBI5169

and program output current gain, like MBI5170

8 constant-current output channels

Constant output current invariant to load voltage change

Constant output current range: 5 -120 mA

Excellent output current accuracy,

between channels: <

±3%

(max.), and

between ICs: <

±6%

(max.)

Output current adjusted through an external resistor

Fast response of output current,

OE (min.): 200 ns @I

out

< 60mA

OE (min.): 400 ns @I

out

= 60~100mA

25MHz clock frequency

Schmitt trigger input

MBI5168CP

SOP16-300-1.27 Weight：0.37g

SOP16-150-1.27 Weight：0.13g

P-DIP16-300-2.54 Weight：1.02g

M B

MBI5168CN

I5 0 0 1

MBI5171CN

MBI5001CN

MBI5001CD

MBI5171CD

MBI5168CD

MBI5171CDW

MBI5168CDW

MBI5001CD

3.3~ 5V supply voltage

256-step run-time programmable output current gain

suitable for white balance application

MBI5171CP

SSOP16-150-0.64 Weight：0.07g

Current Accuracy

Between Channels

±3%

Between ICs

±6%

Conditions

OUT

= 10 ~ 100 mA,

= 0.8V, V

= 5.0V

©Macroblock,

Inc. 2004

Floor 6-4, No.18, Pu-Ting Rd., Hsinchu, Taiwan 30077, ROC.

TEL: +886-3-579-0068, FAX: +886-3-579-7534, E-mail:

info@mblock.com.tw

-1-

August 2004, VA.00

MBI5171

Product Description

8-Bit Constant Current LED Driver with

LED Error Detection and Run-Time Current Adjustment

MBI5171 succeeds MBI5168 and also exploits

PrecisionDrive™

technology to enhance its output characteristics.

Furthermore, MBI5171 uses the idea of

Share-I-O™

technology to make MBI5171 backward compatible with

MBI5168 in both package and electrical characteristics and extend its functionality for LED load Error Detection

and run-time LED current gain control in LED display systems, especially LED traffic sign applications.

MBI5171 contains an 8-bit Shift Register and an 8-bit Output Latch, which convert serial input data into parallel

output format. At MBI5171 output stages, eight regulated current ports are designed to provide uniform and

constant current sinks with small skew between ports for driving LED’s within a wide range of forward voltage (Vf)

variations. Users may adjust the output current from 5 mA to 120 mA with an external resistor R

ext

, which gives

users flexibility in controlling the light intensity of LED’s. MBI5171 guarantees to endure maximum 17V at the

output ports. Besides, the high clock frequency up to 25 MHz also satisfies the system requirements of high

volume data transmission.

MBI5171 extends its functionality to provide one Special Mode in which two functions are included, Error Detection

and Current Gain Control, by means of the

Share-I-O™

technique on pins LE and

, without any extra pins.

Thus, MBI5171 could be a drop-in replacement of MBI5168. The printed circuit board originally designed for

MBI5168 may be also applied to MBI5171. In MBI5171 there are two operation modes and three phases: Normal

Mode phase, Mode Switching transition phase, and Special Mode phase. The signal on the multiple function pin

OE / SW / ED would be monitored. Once an one-clock-wide short pulse appears on the pin OE / SW / ED ,

MBI5171 would enter the Mode Switching phase. At this moment, the voltage level on the pin LE/MOD/CA is used

for determining the next mode to which MBI5171 is going to switch.

In the Normal Mode phase, MBI5171 has exactly the same functionality with MBI5168. The serial data could be

transferred into MBI5171 via the pin SDI, shifted in the Shift Register, and go out via the pin SDO. The LE/MOD/CA

can latch the serial data in the Shift Register to the Output Latch. OE / SW / ED would enable the output drivers to

sink current.

In the Special Mode phase, the low-voltage-level signal OE / SW / ED can enable output channels and detect the

status of the output current to tell if the driving current level is enough or not. The detected error status would be

loaded into the 8-bit Shift Register and be shifted out via the pin SDO along with the signal CLK. Then system

controller could read the error status and know whether the LED’s are properly lit or not.

On the other hand, in the Special Mode phase MBI5171 also allows users to adjust the output current level by

setting a run-time programmable Configuration Code. The code is sent into MBI5171 via the pin SDI. The positive

pulse of LE/MOD/CA would latch the code in the Shift Register into a built-in 8-bit Configuration Latch, instead of

the Output Latch. The code would affect the voltage at the terminal R-EXT and control the output current regulator.

The output current could be adjusted finely by a gain ranging (1/12) to (127/128) in 256 steps. Hence, the current

skew between IC’s can be compensated within less than 1% and this feature is suitable for white balancing in LED

color display panels.

Users can get detailed ideas about how MBI5171 works in the section

Operation Principle.

-2-

August 2004, VA.00

MBI5171CN Related Products

	MBI5171CN	MBI5171	MBI5171CDW	MBI5171CD	MBI5171CP
Description	8-Bit Constant Current LED Driver with LED Error Detection and Run-Time Current Adjustment	8-Bit Constant Current LED Driver with LED Error Detection and Run-Time Current Adjustment	8-Bit Constant Current LED Driver with LED Error Detection and Run-Time Current Adjustment	8-Bit Constant Current LED Driver with LED Error Detection and Run-Time Current Adjustment	8-Bit Constant Current LED Driver with LED Error Detection and Run-Time Current Adjustment

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