Datasheet

Atmel LED Drivers MSL2164 / MSL2166
16-String High-Efciency LED Drivers for
LCD TVs with Advanced Dimming Modes
The MSL2164/MSL2166 compact, high-power LED string drivers use external
current control MOSFETs to sink up to 350mA per string, with matching better
than ±0.8%. The MSL2164/MSL2166 drive 16 parallel strings of LEDs and offer
fault detection and management of open-circuit and short-circuit LEDs.
The MSL2164/MSL2166 feature a 20MHz SPI serial interface. Both devices
support video frame-by-frame LED string intensity control for up to eight
interconnected devices, allowing active area dimming and phase-shifted PWM
outputs. They also include an advanced PWM engine that synchronizes PWM
dimming to the video signal supporting forward, center, reverse and inverse PWM
modes for reduced motion blur and waterfall noise.
The MSL2164/MSL2166 adaptively control any topology DC-DC or AC/DC
converter that power the LED strings. The patent-pending “Efciency Optimizers”
minimize power use while maintaining LED current accuracy.
A unique combination of LED current control and pulse width dimming
management offers simple full-screen brightness control, versatile area dimming
and a consistent white point. Full-scale LED regulation current is set for each
string using current sense resistors and a 10-bit register that controls global
string current. The 12-bit global intensity register controls PWM dimming of all
strings, and each string uses a 12-bit register to control individual string PWM
dimming.
The MSL2164/MSL2166 monitor the LED strings for open-circuit, short-circuit,
loss-of-sync and over-temperature faults, and provide a hardware fault output
(FLTB) to notify the microcontroller. Detailed fault status and control are available
through the serial interface. Additionally, the MSL2164/MSL2166 include on-chip
EEPROMs that allow customizing of the register power-up states via the serial
interface.
The MSL2164/MSL2166 are offered in a 9 x 9 x 0.85mm, 64-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 INTERFACE PACKAGE
MSL2164 3 FBO 64 pin, 9 x 9 x 0.85mm TQFN
MSL2166 2 FBO + 1 FBI 64 pin, 9 x 9 x 0.85mm TQFN
Features:
• 12-Bit PWM String Dimming
• Forward, Center, Reverse and Inverse PWM Modes
• Fast 20MHz SPI Supports Up to 8 Devices per Bus
• 8-Bit Adaptive Power Correction Maximizes Efciency
for Up to 3 String Power Supplies
• External Current Regulation MOSFETs for High
Voltage and/or Current
• Drives Up to 16 Parallel LED Strings Per Device,
Cascade Additional Devices for More Strings
• Supports Adaptive, Real-Time Area Dimming for
Highest Dynamic Range in LCD TVs and Monitors
• Easily Implements Scrolling, 3D, and Local Dimming
Algorithms
• Programmable String Phase Reduces Motion Blur and
Improves Efciency
• Global Intensity Control via SPI Serial Interface
• 0.8% String to String Matching
• PWM Dimming Synchronized to VSYNC and HSYNC
Including Frequency Multipliers and Dividers
• Second Set of PWM Registers Select Alternate
Brightness and Timing
• Congurable Power-up Defaults Through Internal
EEPROM
• LED Open Circuit and Short Circuit Fault Detection
• Individual Fault Detection Enabled for Each String
• Over-Temperature Shutdown Protection
• Broadcast Write Simplies Conguration
• -40°C To +85°C Operating Temperature Range