Description
The LED1642GW is a monolithic, low voltage, low current power 16-bit shift register designed for LED panel displays. The LED1642GW guarantees 20 V output driving capability allowing the user to connect several LEDs in series. In the output stage, sixteen regulated current sources provide from 3 mA to 40 mA constant current to drive the LEDs. The current is programmed through an external resistor and can be adjusted by a 7-bit current gain register in two subranges. The brightness can be adjusted separately for each channel through 12/16-bit grayscale control. Programmable turn-on and turn-off time (four different values available) improves the low noise generation performance of the system. Open/short error detection mode is available in the LED1642GW. The auto power-shutdown and auto power-on features (selectable) allow the device to save power without external intervention.

Features
■ 16 constant current output channels
■ Output current: from 3 mA to 40 mA
■ Current programmable through external resistor
■ 7-bit global current gain adjustment in two ranges
■ 12/16-bit PWM grayscale brightness control
■ Programmable output turn-on/off time
■ Error detection mode (both open and shorted- LED)
■ Programmable shorted-LED detection thresholds
■ Auto power saving/auto-wakeup
■ Selectable SDO synchronization on the CLK falling edge
■ Gradual output delay (selectable)
■ Supply voltage: 3 V to 5.5 V

Applications
■ Full color/monochrome large displays
■ LED signage