SSSSttttaaaarrrrCCCChhhhiiiippppssss Technology SCT2024 V01 03 May/11 1166--bbiitt SSeerriiaall--IInn//PPaarraalllleell--OOuutt CCoonnssttaanntt--CCuurrrreenntt LLEEDD DDrriivveerr 1166--bbiitt SSeerriiaall--IInn//PPaarraalllleell--OOuutt CCoonnssttaanntt--CCuurrrreenntt LLEEDD DDrriivveerr Product Description The SCT2024 serial interfaced LED driver sinks 16 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 SCT2024 guarantees each output can endure maximum 17V DC voltage stress. The built in shift registers and data latches making the SCT2024 effective solution in driving LED display. The output enable function gates all 16 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 SCT2024 will satisfy system which needs high volume data transmission to control the LED display. Furthermore, the SCT2024 provides excellent temperature regulation thus it can be applied to varied of operating temperature. Features 16 robust constant current sinker with LED power supply voltage up to 17V Constant output current : 5 30/45mA 3.3/5V Wide power supply voltages: 3.3V to 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 16 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: SSOP24, SSOP24 1, SOP24 and TQFN24 Applications: LED Displays, Variable Message Signs, Illumination, LED Traffic Signs Page 1 of 21 19 12 SDO OUT9 OE/ 20 11 OUT8 REXT 21 10 GND VDD 22 9 OUT7 SDI 23 8 OUT6 24 7 CLK OUT5 SDO 19 12 OUT10 20 11 OUT9 REXT VDD 21 10 OUT8 GND 22 9 OUT7 23 8 SDI OUT6 CLK 24 7 OUT5 1166--bbiitt SSeerriiaall--IInn//PPaarraalllleell--OOuutt CCoonnssttaanntt--CCuurrrreenntt LLEEDD DDrriivveerr SCT2024 1166--bbiitt SSeerriiaall--IInn//PPaarraalllleell--OOuutt CCoonnssttaanntt--CCuurrrreenntt LLEEDD DDrriivveerr Pin Configurations 1 24 1 24 GND VDD OUT14 OUT13 SDI 2 23 REXT OUT15 2 23 OUT12 3 22 3 22 CLK SDO OE/ OUT11 LA/ 4 21 OE/ SDO 4 21 OUT10 OUT0 5 SCT2024 20 OUT15 REXT 5 20 OUT9 CSSG 6 19 6 19 OUT1 OUT14 VDD OUT8 SCT2024 CSTG OUT2 7 18 OUT13 GND 7 CSAG 18 OUT7 CSOG 8 17 8 17 OUT3 OUT12 SDI OUT6 OUT4 9 16 OUT11 CLK 9 16 OUT5 OUT5 10 15 OUT10 LA/ 10 15 OUT4 11 14 11 14 OUT6 OUT9 OUT0 OUT3 OUT7 12 13 OUT8 OUT1 12 13 OUT2 A B LA/ 1 18 OE/ LA/ 1 18 OUT15 2 17 2 17 OUT0 OUT15 OUT0 OUT14 SCT2024 SCT2024 OUT1 3 16 OUT14 OUT1 3 16 OUT13 CQNG AQNG 4 15 4 15 OUT2 OUT13 OUT2 OUT12 TP(GND) TP(GND) OUT3 5 14 OUT12 OUT3 5 14 OUT11 C D OUT4 6 13 OUT11 OUT4 6 13 OUT10 Terminal Description Pin Name Pin No. I/O Function A B C D 22 10 GND 1 7 Ground terminal(thermal pad included) (TP) (TP) SDI 2 8 23 23 I Serial input of data shift register. Clock input of shift register, data is sampled at the CLK 3 9 24 24 I rising edge of CLK. Input terminal of data strobe. Data is latched when LA/ 4 10 1 1 I LA/ is low. And data on shift register goes through when LA/ is high. 2 9 OUT 0:15 5 20 11 2 2 17 O Open drain, constant current outputs. 11 18 Output enable signal. Output is enabled when OE/ is OE/ 21 3 18 20 I forced to low. Output terminal of serial data output to the SDI of SDO 22 4 19 19 O next SCT2024. Used to connect an external resistor for setting up all REXT 23 5 20 21 I/O output current VDD 24 6 21 22 Supply voltage terminal Page 2 of 21