AS1121

Datasheet AS1121 16-Channel LED Driver with Dot Correction and Greyscale PWM Technical coantmesntAsGtill valid 1 General Description The AS1121 is a 16-channel, constant current-sink LED driver. Each of the 16 channels can be individually adjusted by 4096-step greyscale PWM brightness control and 64-step constant-current sink (dot correction). The dot correction circuitry adjusts the brightness variations between the AS1121 channels and other LED drivers. Greyscale control and dot correction circuitry are accessible via the SPI-compatible serial interface. A single external resistor sets the maximum current value of all 16 channels. The open LED detection function indicates a broken or disconnected LED at one or more of the outputs. The overtemperature protectionflag indicates that the device is in an overtemperature condition. An additional power-down pin puts the AS1121 into a 40nA standbymode. The AS1121 is available in a 32-pin TQFN 5x5 mm package. 2 Key Features Greyscale PWM Control: 12-Bit (4096 Steps) Dot Correction: 6-Bit (64 Steps) Drive Capability (Constant-Current Sink): 0 to 40mA LED Power Supply Voltage: up to 30V Supply Voltage Range: 3.1V to 3.6V SPI-Compatible Serial Interface Output Delay for controlled Inrush Current (factory set, can be turned off) Factory set rise- and fall-time for EMI improvement PWM Clock Rate: up to 10 MHz Data Transfer Clock Rate: up to 30 MHz CMOS Level I/O Diagnostic Features 32-pin TQFN 5x5 mm Package 3 Applications Figure 1. ...