SCT2026CSTG Starchips

SSttaarrCChhiippss SSttaarrCChhiippss Technology SCT2026 V02 01 Jan/08 11116666----bbbbiiiitttt SSSSeeeerrrriiiiaaaallll----IIIInnnn////PPPPaaaarrrraaaalllllllleeeellll----OOOOuuuutttt CCCCoooonnnnssssttttaaaannnntttt----CCCCuuuurrrrrrrreeeennnntttt LLLLEEEEDDDD DDDDrrrriiiivvvveeeerrrr Product Description The SCT2026 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 90mA. The SCT2026 guarantees each output can endure maximum 17V DC voltage stress. The built-in shift registers and data latches making the SCT2026 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 SCT2026 will satisfy system which needs high volume data transmission to control the LED display. Features 16 constant-current outputs rate at 17V Constant output current range: 5 90mA Excellent current regulation to load, supply voltage and temperature 3% Current matching between outputs 6% Current matching between ICs Fast output current control: Minimum PWM pulse width = 120ns All output current are programmed together using a single external resistor CMOS Schmitt triggered inputs High serial data transfer rate: 25MHz Operating supply voltage range of 4.5V to 5.5V Built-in power on reset and thermal protection function Package: SOP24, SSOP24 and SDIP24 Applications: LED Displays, Variable Message Signs, LED Traffic Signs Pin Configurations OUT13 OUT14 GND VDD 1 24 1 24 OUT12 SDI REXT OUT15 2 2 23 23 CLK SDO OE/ 3 22 OUT11 3 22 SDO 4 21 OUT10 LA/ 4 21 OE/ 5 SCT2026 OUT9 5 SCT2026 OUT15 REXT 20 OUT0 20 CSAG 19 6 CSOG 19 VDD 6 OUT8 OUT1 OUT14 CSSG OUT7 OUT13 GND 7 18 OUT2 7 18 CSTG 17 OUT6 17 OUT12 SDI 8 OUT3 8 CSDG OUT5 OUT11 9 16 OUT4 9 16 CLK OUT10 LA/ 15 OUT4 OUT5 10 15 10 14 14 OUT0 11 OUT3 OUT6 11 OUT9 13 13 12 12 OUT1 OUT2 OUT7 OUT8 11116666----bbbbiiiitttt SSSSeeeerrrriiiiaaaallll----IIIInnnn////PPPPaaaarrrraaaalllllllleeeellll----OOOOuuuutttt CCCCoooonnnnssssttttaaaannnntttt----CCCCuuuurrrrrrrreeeennnntttt LLLLEEEEDDDD DDDDrrrriiiivvvveeeerrrr SCT2026 Terminal Description Pin Name Function 1 GND Ground terminal. 2 SDI Serial input of data shift register. 3 CLK Clock input of shift register, data is sampled at the rising edge of CLK. Input terminal of data strobe. Data is latched when LA/ is low. And data 4 LA/ on shift register goes through when LA/ is high. 5 -20 OUT 0:15 Open-drain, constant-current outputs. 21 OE/ Output enable signal. Output is enabled when OE/ is forced to low. 22 SDO Output terminal of serial-data output to the SDI of next SCT2026. 23 REXT Used to connect an external resistor for setting up all output current. 24 VDD Supply voltage terminal. Block Diagram Ordering Information OUT0 OUT1 OUT14 OUT15 Part Package SCT2026CSOG Pb free SOP24 SCT2026CSSG Pb free SSOP24 SCT2026CSAG Pb free SSOP24 Current REXT SCT2026CSTG Pb free SSOP24-1.0 Output Driver Regulator SCT2026CSDG Pb free SDIP24 StarChips Technology, Inc. OE/ Q Q Q Q 4F, No.5, Technology Rd.,Science-Based D ST D ST D ST D ST Industrial Park, Hsin-Chu,Taiwan, R.O.C. LA/ Tel: +886-3-577-5767 555 D Q D Q D Q D Q SDI Fax+886-3-577-6575 SDO C C C C service starchips.com.tw CLK Truth Table CLK LA/ OE/ SDI OUT0 ~ OUT15 SDO H L Dn Dn Dn-1 ---- Dn-14 Dn-15 Dn-15 L L Dn+1 No change Dn-14 H L Dn+2 Dn+2 Dn+1 ---- Dn-12 Dn-13 Dn-13 X L Dn+3 Dn+2 Dn+1 ---- Dn-12 Dn-13 Dn-13 X H Dn+3 Off Dn-13 Page 2 of 14