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MY-Semi |
MY-Semi
MY9221
12-Channel LED Driver With Grayscale
Adaptive Pulse Density Modulation Control
General Description
The MY9221, 12-channels (R/G/B x 4) c o n s t a n t
current APDM (Adaptive Pulse Density
M o d u l a t i o n ) LED driver, operates over a 3V ~ 5.5V
input voltage range. The device provides 1 2 open-drain
constant current sinking outputs that are rated to 1 7 V
and delivers up to 60mA of high accuracy current to
each string of LED. The current at each output is
programmable by means of three external current
setting resistors. MY9221 features a 1 0 M H z E M I
r e d u c t i o n data clock input. MY9221 also offers a
2-wire serial interface to send the grayscale data, control
command including 16/14/12/8-bit grayscale selection,
grayscale clock frequency division selection, output
polarity selection for high power LED driving, output Tr/Tf
timing selection, current output waveform selection, and
to realize the internal-latch function. MY9221 provides
adaptive pulse density modulation method to increase the visual
refresh rate up to 1000 Hz @ 16-bit grayscale and reduce the
flickers, and it also provides output current bilateral
processing for EMI reduction. Moreover MY9221 utilizes
clock duty recovery technique and pulse re-timing to help
long distance and multiple cascading applications.
MY9221 provides typical ±1% channel-to-channel
LED current accuracy. Additional features include a
±0.1% regulated output current capability and fast output
transient response. MY9221 is available in a 20-pin QFN
or 24-pin SSOP/TSSOP package and specified over the
-40°C to +85°C ambient temperature range.
Applications
❑ Indoor and Outdoor LED Video Displays
❑ Full Color Mesh Display
❑ Full Color Dot Matrix Module
❑ Architectural and Decorative Lighting
❑ LCD Display Backlighting
Typical Operating Circuits
Features
✦ 3 ~ 5.5V Operating supply voltage
✦ R/G/B x4 Output Channels
✦ 3~60mA@5V Constant current output range
✦ [email protected] Constant current output range
✦ Current setting by 3 external resistors
✦ 17V Rated output channels for long LED strings
✦ ±1%(typ.) LED Current accuracy between channels
✦ ±2%(typ.) LED Current accuracy between chips
✦ 20Mbps(max.) ~ 140 Kbps(min.) data rate for EMI
reduction data transfer[[[pppaaattteeennntttpppeeennndddiiinnnggg]]]
✦ 16 / 14 / 12 / 8 bit grayscale selection
✦ Built-in internal grayscale clock supports refresh rate
>1000Hz@16-bit grayscale, >256KHz@8-bit grayscale
✦ Internal Grayscale clock frequency selection for High
Power LED driving application (min. 33.6KHz)
✦ Grayscale clock source selection (SSOP & TSSOP
only): internal or external
✦ PWM or APDM control selection[[[pppaaattteeennntttpppeeennndddiiinnnggg]]]
✦ Clock duty recovery for cascading application
✦ Schmitt trigger input
✦ Output Current Tr / Tf programmable
✦ Output Current Bilateral Processing for EMI reduction
✦ -40°C to +85°C Ambient temperature range
Order information
Part Package Information
MY9221SA SOP24-236mil-1.0mm
2000 pcs/Reel
MY9221SS SSOP24-150mil-0.635mm 2500 pcs/Reel
MY9221QD QFN20-4mmx4mm-0.5mm 3000 pcs/Reel
TSSOP24-173mil-0.65mm
MY9221TE
(Exposed Pad)
Pin Configuration
2500 pcs/Reel
Nov. 2011 Ver. 1.0
SA / SS / TE
QD
MY-Semi Inc. 0
For pricing, delivery, and ordering information, please contact MY-Semi Inc. at +886-3-560-1668,
MY9221
Block Diagram
MY-Semi
DI
DCKI
GCKI
OSC
12 Constant Current
LED Drivers
Current
Setting
REXT_A
REXT_B
REXT_C
Counter
12 PWM/APDM generators
with ∆-width correction
Controller
192-bit data latch
16
16-bit cmd latch
retiming
16
D[0]… D[16]… D[32]… D[48]
D[143]… D[159]… D[175]… D[191] Cmd[0]
208-bit shift register
Cmd[15]
Duty
recovery
Duty
recovery
DO
DCKO
GCKO
12-Channel LED Driver with Grayscale APDM Control
Copyright© MY-Semi Inc. 1
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