SSttaarrCChhiippss SSttaarrCChhiippss Technology SCT2110 V03 01 Mar/08 8888----bbbbiiiitttt SSSSeeeerrrriiiiaaaallll----IIIInnnn////PPPPaaaarrrraaaalllllllleeeellll----OOOOuuuutttt CCCCoooonnnnssssttttaaaannnntttt----CCCCuuuurrrrrrrreeeennnntttt LLLLEEEEDDDD DDDDrrrriiiivvvveeeerrrr Product Description The SCT2110 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 160mA. The SCT2110 guarantees each output can endure maximum 17V DC voltage stress. The built-in shift registers and data latches making the SCT2110 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 SCT2110 will satisfy system which needs high volume data transmission to control the LED display. Features 8 constant-current outputs rate at 17V Constant current range: 5 160mA 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 = 100ns 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: SOP16 and SSOP16 Applications: LED Displays, Variable Message Signs, LED Traffic Signs Pin Configurations Ordering Information GND VDD 1 16 SDI 2 REXT 15 CLK 3 14 SDO Part Number Package SCT2110 LA/ 4 13 OE/ Pb free SOP16 (150 mil) CSOG SCT2110CSOG 5 OUT0 OUT7 12 CSWG Pb free SOP16 (300 mil) SCT2110CSWG 6 11 OUT6 OUT1 CSSG SCT2110CSSG Pb free SSOP16 10 OUT5 OUT2 7 OUT3 8 9 OUT4 StarChips Technology, Inc. 4F, No.5, Technology Rd., Science-Based Industrial Park, Hsin-Chu,Taiwan, R.O.C. Tel: +886-3-577-5767 555 Fax+886-3-577-6575 service starchips.com.tw 8888----bbbbiiiitttt SSSSeeeerrrriiiiaaaallll----IIIInnnn////PPPPaaaarrrraaaalllllllleeeellll----OOOOuuuutttt CCCCoooonnnnssssttttaaaannnntttt----CCCCuuuurrrrrrrreeeennnntttt LLLLEEEEDDDD DDDDrrrriiiivvvveeeerrrr SCT2110 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 -12 OUT 0:7 Open-drain, constant-current outputs. 13 OE/ Output enable signal. Output is enabled when OE/ is forced to low. 14 SDO Output terminal of serial-data output to the SDI of next SCT2110. 15 REXT Used to connect an external resistor for setting up all output current. 16 VDD Supply voltage terminal. Block Diagram OUT1 OUT7 OUT0 OUT6 Current REXT Output Driver Regulator OE/ Q Q Q Q ST D ST D ST D ST D LA/ D D Q D D SDO Q Q Q SDI C C C C CLK Truth Table CLK LA/ OE/ SDI OUT0 ~ OUT7 SDO H L Dn Dn Dn-1 ---- Dn-6 Dn-7 Dn-7 L L Dn+1 No change Dn-6 H L Dn+2 Dn+2 Dn+1 ---- Dn-4 Dn-5 Dn-5 X L Dn+3 Dn+2 Dn+1 ---- Dn-4 Dn-5 Dn-5 X H Dn+3 Off Dn-5 Page 2 of 13