MBI5155 Datasheet PDF - Macroblock

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MBI5155
Macroblock

Part Number MBI5155
Description 16-Channel Low Knee Voltage PWM Constant Current LED Driver
Page 30 Pages


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Preliminary Datasheet
MBI5155
16-Channel Low Knee Voltage PWM Constant Current LED Driver
for Low Voltage Power Supply, 1:32 Time-Multiplexing Applications
Features
3V-4.2V supply voltage
Design optimization
16 constant current output channels
Constant output current range:
- 0.5~10mA @ 4.2V supply voltage
- 0.5~5mA @ 3.3V supply voltage
Low knee voltage of output channels
VDS=0.3V @ IOUT = 10mA, VDD=4.2V
Excellent output current accuracy:
Between channels:<±2.5(Max.)
Between ICs: <±3(Max.)
Built-in 16K-bit SRAM to support time-multiplexing for 1 ~ 32 scans
16-bit/14-bit /13-bit color depth PWM control to improve visual refresh rate
6bit current gain12.5%~200%
LED failure isolation
-LED failure induced cross elimination
LED open detection
Integrating ghost elimination circuit
GCLK multiplier technology
Maximum DCLK frequency: 30MHz
Package MSL Level : 3
Macroblock, Inc. 2015
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 - April 2015, V1.00



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MBI5155
16-Channel Low Knee Voltage PWM Constant Current
LED Driver for Low Voltage Power Supply,
1:32 Time-multiplexing Applications
Product Description
MBI5155 is designed for LED video applications using internal Pulse Width Modulation (PWM) control with
selectable 16-bit / 14-bit / 13-bit color depth, and the circuit characteristics is optimized for applications with 4.2V
supply voltage. MBI5155 features a 16-bit shift register which converts serial input data into each pixel’s gray scale
of the output port. Sixteen regulated current ports are designed to provide uniform and constant current sinks for
driving LEDs with a wide range of VF variations. The output current can be preset through an external resistor. The
innovative architecture with embedded SRAM is designed to support up to 1:16 time-multiplexing applications.
Users only need to send the whole frame data once and to store in the embedded SRAM of the LED driver, instead
of sending every time when the scan line is changed. It helps to save the data bandwidth and to achieve high
grayscale with very low data clock rate. With scan-type Scrambled-PWM (S-PWM) technology, MBI5155 enhances
PWM by scrambling the “on” time of each scan line into several “on” periods and sequentially drives each scan line
for a short “on” period. The enhancement equivalently increases the visual refresh rate of scan-type LED displays. In
addition, the innovative GCLK multiplier technique doubles visual refresh rate.
MBI5155 drives the corresponding LEDs to the brightness specified by image data. With MBI5155, all output
channels can be built with 16-bit color depth (65,536 gray scales). When building a 16-bit color depth video, S-PWM
technology reduces the flickers and improves the image fidelity.
Through compulsory error detection, MBI5155 detects individual LED for open-circuit errors without extra
components. MBI5155 equipped an innovative cross elimination function, and it solves the cross phenomenon
induced by failure LEDs. Besides, integrated ghost elimination circuit eases the ghosting problems. Embedded low
grayscale processing technology effectively fixed the image display defects, and improved the quality of image
display.
- 2 - April 2015, V1.00



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MBI5155
Block Diagram
16-Channel Low Knee Voltage PWM Constant Current
LED Driver for Low Voltage Power Supply,
1:32 Time-multiplexing Applications
OUT0 OUT1
OUT14 OUT15
R-EXT
IO Regulator
Digital to
analog
converter
Pre-charge
Circuit
Output Buffers
GCLK
14-bit
Counter
LE
GND
SDI
DCLK
Control
Unit
16 16
16 16
16K-bit
SRAM Buffers
16 16
16-bit Shift Register (FIFO)
Figure 1
16
SDO
- 3 - April 2015, V1.00



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MBI5155
16-Channel Low Knee Voltage PWM Constant Current
LED Driver for Low Voltage Power Supply,
1:32 Time-multiplexing Applications
Pin Configuration
GND
SDI
DCLK
LE
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
1
2
3
4
5
6
7
8
9
10
11
12
24 VDD
23 R-EXT
22 SDO
21 GCLK
20 OUT15
19 OUT14
18 OUT13
17 OUT12
16 OUT11
15 OUT10
14 OUT9
13 OUT8
MBI5155 GP / GM
LE
OUT0
OUT1
OUT2
OUT3
OUT4
24 23 22 21 20 19
1 18
2 17
3 16
4 15
5 14
6 13
7 8 9 10 11 12
OUT15
OUT14
OUT13
OUT12
OUT11
OUT10
MBI5155GFN
Terminal Description
Pin Name
GND
SDI
DCLK
LE
Function
Ground terminal for control logic and current sink
Serial-data input to the shift register
Clock input terminal used to shift data on rising edge and carries
command information when LE is asserted.
Data strobe terminal and controlling command with DCLK
OUT0 ~ OUT15
GCLK
SDO
R-EXT
VDD
Constant current output terminals
Gray scale clock terminal
Clock input for gray scale. The gray scale display is counted by gray scale
clock compared with input data.
Serial-data output to the receiver-end SDI of next LED driver
Input terminal used to connect an external resistor for setting up output
current for all output channels
3.3V/5V supply voltage terminal
- 4 - April 2015, V1.00



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