SERIAL-INTERFACED 16-DIGIT LED CONTROLLER IC WITH KEYSCAN

DESCRIPTION

The UL319 is a compact LED controller and driver that

interface microprocessors to LED displays through a serial

4-wire interface. It drives LED connected in common anode

configuration. The UL319 drives up to 128 discrete LEDs in

16 segment/8 digit configuration while functioning from a

supply voltage of 5.0V.

FEATURES

* LED driver with 24 outputs (16 segments/8 digits)

* Output pins connected directly to the LEDs

* Key-scanning (8 x 4 matrix)

* 3-wire serial bus interface (CLK, STB, DI/O)

* 8-step dimming circuit to control the overall display brightness

* Inputs with Schmitt trigger give superior noise immunity

* 5.0 V (± 10%) for VDD

* Drives common-anode LED digits

* Built-in power on reset circuits

* Built-in pull-up resistor (CLK,STB,DOUT)