| Key | Value |
|---|---|
| Interface Type: | SPI (PWM) |
| Number of Strings: | 16 |
| Max Current per String: | 60mA |
| LEDs per String: | 10 |
| Max String Match: | 3.0% |
| String Current Global: | 8 bits + R |
| String PWM Global: | 8 bits |
| String PWM per String: | 12 bits |
| String Phasing: | 12 bits |
| External VSYNC: | Yes |
The Atmel mSilica MSL4164 compact, high-power LED string driver uses internal current control MOSFETs to sink up to 100mA per string, with current accuracy and matching better than 3%. The MSL4164 drive 16 parallel strings of 10 white LEDs each, for a total of 160 white LEDs per device. Sixteen interconnected devices control up to 2560 white LEDs.
The MSL4164 features a 20MHz SPI bus interface supporting 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 EEPROM allows the power-up defaults to be customized through the serial interface.
The MSL4164 adaptively control the DC-DC converters that power the LED strings, using mSilica Adaptive SourcePower™ technology. These efficiency optimizers minimize power use, while maintaining LED current accuracy.
A unique combination of peak current control and pulse width management offer simple, ful- screen brightness control, versatile area dimming, and a consistent white point. One external resistor sets 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.
