MIC5400BWM Micrel Inc, MIC5400BWM Datasheet

MIC5400BWM

Manufacturer Part Number

MIC5400BWM

Description

IC LED DRIVER RGB 28-SOIC

Manufacturer

Micrel Inc

Type

RGB LED Driverr

Datasheet

1.MIC5400YWM_TR.pdf (10 pages)

Specifications of MIC5400BWM

Topology

PWM

Number Of Outputs

Internal Driver

Yes

Type - Primary

General Purpose

Type - Secondary

RGB

Voltage - Supply

4.75 V ~ 5.5 V

Mounting Type

Surface Mount

Package / Case

28-SOIC (7.5mm Width)

Operating Temperature

-40°C ~ 125°C

Current - Output / Channel

30mA

Internal Switch(s)

Yes

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Voltage - Output

Frequency

Efficiency

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General Description

The MIC5400 consists of 2 banks of 8 LED driver outputs,

each output capable of sinking up to 30mA. Each bank is

intended to drive 8 LED pixels of the same color. Most

applications will use the MIC5400 to drive pixel clusters of 4

LEDs (RRGB.) Typically two red LEDs are used for every one

green and blue to compensate for red LED brightness.

A single external resistor sets maximum drive current. Use of

an external resistor allows different color LED banks to be

biased to the same intensity. Brightness control is digitally

programmed through the serial interface. Coarse Brightness

Control is determined by two 4-bit DACs, one for each driver

bank, limiting the full-scale output to a fraction of the maxi-

mum value. Additionally, each output has Fine Brightness

Control using 10-bit resolution PWM.

Groups of drivers can be cascaded in Daisy Chain fashion.

Open circuit output faults are detected and can be read back

from the internal Status register.

Typical Application

January 2005

MIC5400

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

SHIFTOUT

SHFTCLK

0.01µF

SHIFTIN

LOAD

SET

VDD

Control and

SRegister

Logic

MIC5400

Output B

Output A

VDDA

VDDB

BD_A

BD_B

Features

• 2 banks of 8 outputs

• Output characteristics:

• Current sink: 30mA

• Full protection:

• Output transitions are staggered to minimize supply

Applications

• Outdoor video screen

• Large LED display

Ordering Information

Dual, 8-Output, 14-Bit LED Video Display Driver

Part Number

MIC5400BWM

MIC5400YWM

– Programmable brightness control

– Resistor sets maximum LED current to compensate

– Current limit on each output

– Over-temperature shutdown

– Watchdog disables output under fault condition

– Power-on reset (all LEDs Off)

– Soft-start on power up and watchdog recovery

– Output open fault detection with status register

readback

transients

• Coarse: 4-bit resolution DAC

• Fine: 10-bit resolution PWM

variation in LEDs

Junction Temp. Range

–40°C to +85°C

MIC5400

2.2µF

330½

BCP69

28-Pin Wide SOIC

Package

MIC5400

Micrel

Related parts for MIC5400BWM

MIC5400BWM Summary of contents

Page 1

... Soft-start on power up and watchdog recovery – Output open fault detection with status register readback • Output transitions are staggered to minimize supply transients Applications • Outdoor video screen • Large LED display Ordering Information Part Number MIC5400BWM MIC5400YWM R SC MIC5400 VDDA Output A BD_A Logic Control and ...

Page 2

MIC5400 Pin Configuration Pin Description Pin Number Pin Name Pin Name 1,2,3,4 A4,A3,A2,A1 5 LOAD 6 SHFTCLK 7 VDD 8,22 GND 9 SHIFTIN 10 SHIFTOUT 11,12,13,14 B1,B2,B3,B4 15,16,17,18 B5,B6,B7,B8 19 VDDB 20 BD_B 21 REF 23 BD_A 24 VDDA 25,26,27,28 ...

Page 3

MIC5400 Absolute Maximum Ratings Supply Voltage .............................................................. +7V Input Voltage ....................................... –0. Base Drive Voltage ....................................................... +7V Output Sink Current (per output) ................................ 35mA Lead Temperature (soldering, 5 sec) ........................ 260°C Junction Temperature (T )(max) ............................... 125°C J ...

Page 4

MIC5400 Test Circuit Controller Timing Diagrams Control Register Contents Shift Register Contents Status Register Contents Linearity MIC5400 75Ω Device Under Test OUT N V Figure 1. AC Output Test Circuit SHFTCLK LOAD D D N-1 N ...

Page 5

MIC5400 Functional Diagram Data and Control Register (36 bits) 36 Bit Shift Register SHIFTIN SHFTCLK January 2005 PWM Select (3 Bits) Select Bank A/B PWM Select PWM Data A (10 Bits) PWM Data B (10 Bits) ...

Page 6

MIC5400 Address Data A 3 Bits 10 bits Q13 [Q1 = LSB] Bit ...

Page 7

MIC5400 Status A Status Open Circuit Open Circuit] 8 Bits 8 Bits D1-D8 D9-D16 Bit ...

Page 8

MIC5400 Applications Information Output Current Drive The MIC5400 includes several ways to program LED output current. These output current controls are superimposed and have an additive effect on LED output current as follows: Global Full Scale Current Limit: This function ...

Page 9

MIC5400 TIME (2.5ns/div) Output Current Sink Rise Time January 2005 Clock to Shiftout Delay Time TIME (2.5ns/div) Output Current Sink Fall Time 9 Micrel TIME (2.5ns/div) MIC5400 ...

Page 10

MIC5400 Package Information MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel ...

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