SSSSttttaaaarrrrCCCChhhhiiiippppssss Technology SCT2167 V01 02 Jul/12 88--bbiitt SSeerriiaall--IInn//PPaarraalllleell--OOuutt CCoonnssttaanntt CCuurrrreenntt DDrriivveerr 88--bbiitt SSeerriiaall--IInn//PPaarraalllleell--OOuutt CCoonnssttaanntt CCuurrrreenntt DDrriivveerr Product Description The SCT2167 serial interfaced LED driver sinks 8 LED clusters with constant current to keep the uniform intensity of LED displays. In applications, an external resistor is used to set the full scale constant output current from 5mA up to 45mA. The SCT2167 guarantees each output can endure maximum 17V DC voltage stress. The built in shift registers and data latches making the SCT2167 effective solution in driving LED display. The output enable function gates all 8 outputs on and off, and is fast enough to be used as PWM input for LED intensity control. Since the serial data input rate can be reached up to 25MHz, the SCT2167 will satisfy system which needs high volume data transmission to control the LED Features 8 constant current sinkers with output voltage sustainable to 17V Constant output current : 5 30/45mA 3.3/5V Excellent regulation to load, supply voltage and temperature Temperature regulation: 0.005%/C load regulation: 0.1%/V line regulation: 0.5%/V High current matching accuracy: 1% between outputs, 2% between ICs Fine grayscale response with 180ns PWM pulse width Dropout voltage 0.5V 20mA, V =5V DD CMOS Schmitt trigger inputs with clock rate up to 25MHz cascade connection The constant current value of 8 outputs is set by a single external resistor Interlaced 30ns delay of output, preventing instant current surge and output bouncing overstress Built in power on reset(POR) circuit forces all the outputs off while power on Package: SSOP16 and SOP16 Applications: LED Displays, Variable Message Signs, Illumination, LED Traffic Signs 88--bbiitt SSeerriiaall--IInn//PPaarraalllleell--OOuutt CCoonnssttaanntt CCuurrrreenntt DDrriivveerr SCT2167 88--bbiitt SSeerriiaall--IInn//PPaarraalllleell--OOuutt CCoonnssttaanntt CCuurrrreenntt DDrriivveerr Pin Configurations GND 1 16 VDD 2 15 SDI REXT CLK 3 14 SDO 4 13 LA/ SCT2167 OE/ CSSG OUT0 5 12 OUT7 CSOG OUT1 6 11 OUT6 7 10 OUT2 OUT5 OUT3 8 9 OUT4 Terminal Description Pin Name Pin No. I/O Function GND 1 Ground terminal SDI 2 I Serial input terminal of data shift register Clock input terminal of shift register, data is sampled at the rising edge CLK 3 I of CLK. Data is latched when LA/ is low. Data on shift register goes through LA/ 4 I when LA/ is high. OUT 0:7 5 12 O Open drain, constant current outputs. Input terminal of output enable signal. Output is enabled when OE/ is OE/ 13 I low. SDO 14 O Output terminal of serial data output to the SDI of next SCT2167. REXT 15 I/O Synchronous signal, daisy chain output terminal. VDD 16 Supply voltage terminal Block Diagram OUT0 OUT1 OUT2 OUT6 OUT7 Current REXT Regulator Output Sink Driver POR O O O O O OE/ ST D ST D ST D ST D ST D LA/ D O D O D O D O D O SDI SDO C C C C C CLK SCT2167 Page 2 of 16