HT16D595 Datasheet, PDF (1/11 Pages) Holtek Semiconductor Inc – 8-Bit Constant Current LED Driver

HT16D595
8-Bit Constant Current LED Driver
Feature
●● Logic supply voltage: 3.3V~5.5V
●● 8-channel constant current output
●● Channel output current is fixed at 48mA
●● Build-in current setting resistor
●● High output current accuracy:
Variation between chips is less than ±6%
●● Up to 25MHz serial interface clock frequency
●● Maximum output terminal voltage 17V
●● Schmitt trigger input structure
●● 16-pin NSOP package
Applications
●● LED Display
●● Digital clock, thermometer, counter, voltmeter
●● Other consumer application
General Description
The HT16D595 is a high accuracy constant current
driver which is specifically designed for LED display
applications. The device provides 8-channel stable
and constant current outputs for driving LEDs which
may have different forward voltage characteristics,
VF, due to process variations. Communication with
the outside world is catered for by including a fully
integrated serial interface function, which provides
designers with a means of easy communication with
external peripheral hardware. In this way, many
devices can be cascaded together to drive larger LED
displays. Furthermore, with this serial-to-serial or
serial-to-parallel structure, the device is very suitable
as a replacement for the 74HC595, in applications and
related products which include an 8-bit serial input
and serial or parallel output.
Block Diagram
OUT0
Current Setting Resistor
OUT1
OUT7
OE
LE
SDI
CLK
8 bit Output Driver
8
8 bit Output Latch
8
8 bit Shift Register
SDO
Rev. 1.00
1
August 04, 2011