Atmel LED Drivers-MSL3163 and MSL3164
16-string White & RGB LED Drivers with Adaptive Power
Control, E²PROM, and SPI/I²C/SMBus Serial Interface
General Description
The Atmel LED Drivers-
MSL3163 and MSL3164
compact, high-power LED
string drivers use internal
current control MOSFETs to
sink up to 100mA per string,
with current accuracy and
matching better than 3%. The
MSL3163/4 drive 16 parallel
strings of ten white LEDs
each, for a total of 160 white
LEDs per device. Sixteen
interconnected devices control
up to 2560 white LEDs.
The MSL3163/4 adaptively controls the DC-DC converters that power the
LED strings, using Atmel's Adaptive SourcePower technology. These Efficiency
Optimizers minimize power use while maintaining LED current accuracy.
The MSL3164 features a 20 MHz SPI serial interface, and the MSL3163 offers
a 1 MHz I
2
C serial interface. Both interfaces support video frame-by-frame
LED string intensity control for up to 16 interconnected devices to allow active
area dimming. The devices include an advanced PWM engine that easily
synchronizes to a video signal, and per-string phase adjustment to reduce
unwanted LCD artifacts such as motion blur. Additionally, an on-chip E²PROM
allows the power-up defaults to be customized through the serial interface.
A unique combination of peak current control and pulse width management
offer simple full screen brightness control, versatile area dimming and
a consistent white point. One external resistor provides the global peak
reference current for all LED strings, and global peak current fine-tuning is
available through an 8-bit register. Global string drive pulse width is adjusted
with an 8-bit global intensity register, and individual string pulse width is
modulated with 12-bit registers.
The MSL3163/4 feature fault monitoring of open circuit, short circuit, loss
of video sync and over temperature conditions, and provides a fault output
to notify the system controller. Detailed fault status and control are available
through the serial interface.
The MSL3163/4 are offered in a 6 x 6 x 0.75mm, 40-pin TQFN package and
operate over the -40°C to 85°C temperature range.
Applications
Long Life, Efficient LED Backlighting For:
•
Televisions and Desktop Monitors
•
Medical and Industrial Instrumentation
•
Automotive Audio-visual Displays
Channel Signs
Architectural Lighting
Ordering Information
16-CHANNEL LED STRING DRIVERS
PART
MSL3163BT
MSL3164BT
INTERFACE
I
2
C interface
SPI interface
PACKAGE
40 pin, 6 x 6 x 0.75mm TQFN
40 pin, 6 x 6 x 0.75mm TQFN
2
Atmel LED Drivers-MSL3163/MSL3164
Atmel LED Drivers-MSL3163 and MSL3164
16-string White & RGB LED Drivers with Adaptive Power
Control, E²PROM, and SPI/I²C/SMBus Serial Interface
Key Features
•
12-bit PWM String Dimming Operates at 240Hz
•
Fast Serial Interfaces Support up to 16 Devices
per Bus:
- MSL3164 20 MHz SPI
- MSL3163 1 MHz I
2
C
•
8-bit Adaptive Power Correction Maximizes
Efficiency of up to Three String Power Supplies
•
Drives 16 Parallel LED Strings of 10 White LEDs
Each for up to 2560 White LEDs per Serial Bus
•
Supports Adaptive, Real-time Area Dimming for
Highest Dynamic Range LCD TVs and Monitors
•
Programmable String Phase Reduces Motion Blur
•
Global Intensity Control via Serial Interface
•
100mA Peak, 60mA Average LED String Current
•
Single Resistor Sets Peak Current for all LED Strings
•
±3% Current Accuracy and Current Balance
•
Video Frame (VSYNC) and Line (HSYNC) Sync
Inputs
•
Sync Loss Detectors Optionally Disable LED Strings
•
Multiple MSL3163/4s Share String Power
Supplies and Automatically Negotiate the
Optimum Supply Voltage
•
E²PROM Allows Customized Power-On Defaults
•
Less Than 1µA LED String Off-Leakage Current
•
String Open Circuit and LED Short Circuit Fault
Detection
•
Individual Fault Detection Enable for Each String
•
Over-temperature Shutoff Protection
•
Broadcast Write Simplifies Configuration
•
-40°C To +85°C Operating Temperature Range
Application Circuit
Ω
Atmel LED Drivers-MSL3163/MSL3164
3
Integrated technical exchanges
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