DM141 Version : A.012 Issue Date : 2004/04/09 File Name : SP-DM141-A.012.doc Total Pages : 16 8x2-Channels Constant Current LED Driver 新竹市科學園區展業一路 9 號 7 樓之 1 SILICON TOUCH TECHNOLOGY INC. 9-7F-1, Prosperity Road I, Science Based Industrial Park, Hsin-Chu, Taiwan 300, R.O.C. Fax：886-3-5645626 Tel：886-3-5645656 點晶科技股份有限公司 DM141 SILICON TOUCH TECHNOLOGY INC. DM141 8x2-Bit Constant Current LED Drivers General Description The DM141 is a constant current driver specifically designed for LED display applications. The device includes a 16-bit shift register, a latch, and dual-interleaved banks of constant current drivers on a single Silicon CMOS chip. Each of the dichotomous 8-bit banks requires a current setting resistor. The output current ranges from 5mA to 60mA. Features Constant Current Output: From 5mA to 60mA Maximum Clock Frequency: 25MHz (Max) Power Supply Voltage: 3.3V to 5.0V CMOS Compatible Input/Output Package: QFN32, SDIP28, SSOP28 Constant Current Matching: 10mA to 60mA : Bit-to-Bit : ± 4.0% (Max)、 5mA to 10mA Chip-to-Chip : ± 10 .0% (Max) : Bit-to-Bit : ± 6.0% (Max)、 Chip-to-Chip : ± 12 .0% (Max) Maximum Output Voltage: 17V Two-color LED driving capability on chip 8x2-Bit Constant Current LED Drivers -1- Version：A.012 點晶科技股份有限公司 DM141 SILICON TOUCH TECHNOLOGY INC. Pin Connection (Top view) QFN32 SDIP28, SSOP28 23 22 21 20 19 18 R3 GND GND G4 27 R4 R7 G5 26 R5 G7 GND G6 R6 24 25 17 16 G3 15 R2 14 G2 13 GND 12 R1 Thermal Pad 28 GND G8 29 R8 30 11 G1 GND 31 10 GND RESERVED 32 9 SOUT GRES RRES GND 5 6 7 8 LTH 4 CLK 3 SIN 2 VDD 1 VDD SIN CLK LTH EN GND G1 R1 G2 R2 G3 R3 G4 R4 EN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 GND RRES GRES SOUT RESERVED GND R8 G8 R7 G7 R6 G6 R5 G5 Pin Description Pin No. Pin No. Pin NAME FUNCTION (QFN32) (SDIP28, SSOP28) 5 1 VDD Supply voltage terminal. 6 2 SIN Input terminal of a data shift register. Data for R8 should be shifted in first, and then the data for G8 followed. 7 3 CLK Input terminal of a clock for shift register. Data is sampled at the rising edge of CLK. 8 4 LTH Input terminal of data strobe. Data is latched when LTH is low. And data on shift register goes through when LTH is high. 9 5 EN 11, 14, 16, 19, 7,9,11,13, G1~8 Input terminal of output enable (active low), all outputs are off when EN is high. Constant current output terminals (Bank G). 21, 24, 26, 29 15,17,19,21 12, 15, 17, 20, 8,10,12,14, R1~8 Constant current output terminals (Bank R). 22, 25, 27, 30 16,18,20,22 4, 10, 13, 18, 6,23,28 GND Ground terminals. 23, 28, 31 32 24 1 25 RESERVED Reserved pin for future. SOUT Output terminal of a data shift register. 2 26 GRES Input terminal of an external resistor (Bank G). The current flows through the resistor from GRES to ground will be the (Bank G) reference base current of output sink current. 3 27 RRES Input terminal of an external resistor (Bank R). 8x2-Bit Constant Current LED Drivers -2- Version：A.012 點晶科技股份有限公司 DM141 SILICON TOUCH TECHNOLOGY INC. 15 En 16 EN 14 En 11 07 05 Bank B Constant Current Drivers 12 10 08 06 03 04 R8 G8 R7 R6 G7 R5 G6 R4 09 G5 R3 G4 R2 13 G3 G2 R1 G1 Block Diagram 01 02 Bank A Constant Current Drivers Bank R Current Controller RRES Bank G Current Controller GRES 16 Bit Latch LTH VDD GND 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 SIN 16 Bit Shift Register SOUT CLK Equivalent Circuit of Inputs and Outputs 1. CLK, SIN, LTH, EN terminals 2. SOUT terminal VDD VDD INPUT SOUT GND GND 8x2-Bit Constant Current LED Drivers -3- Version：A.012 點晶科技股份有限公司 DM141 SILICON TOUCH TECHNOLOGY INC. Maximum Ratings (Tj(max) = 150°°C) CHARACTERISTIC SYMBOL RATING UNIT Supply Voltage Input Voltage VDD VIN 0 ~ 7.0 -0.3 ~ VDD+0.3 V V Output Current IOUT 60 mA Output Voltage VOUT -0.3 ~ 17 V Clock Frequency fCLK 25 MHz GND Terminal Current IGND 960 mA 3.08 (QFN-32 : Ta=25°C) Power Dissipation PD W 3.12 (SDIP-28 : Ta=25°C) 1.1 (SSOP-28 : Ta=25°C) 40.6 (QFN-32) Thermal Resistance Rth(j-a) °C/W 40 (SDIP-28) 113.3 (SSOP-28) Storage Temperature Tstg °C -40 ~ 150 Recommended Operating Condition CHARACTERISTIC Supply Voltage Output Voltage Operating temperature Output Current Input Voltage LTH Pulse Width CLK Pulse Width Set-up Time for DATA Hold Time for DATA Set-up Time for LTH Clock Frequency SYMBOL VDD VOUT TOPR IO IOH IOL VIH VIL tw LAT tw CLK tsetup(D) thold(D) tsetup(L) fCLK CONDITION (G, R)n SOUT SOUT MIN. 3.0 TYP. 5.0 -20 5 0.8VDD -0.3 VDD = 3.3 ~ 5.0 V 15 15 10 10 15 Cascade operation 8x2-Bit Constant Current LED Drivers -4- MAX. 5.5 17 85 60 1.0 -1.0 VDD+0.3 0.2VDD UNIT V V ℃ ns ns ns ns ns MHz 25 mA V Version：A.012 點晶科技股份有限公司 DM141 SILICON TOUCH TECHNOLOGY INC. Electrical Characteristics (Typ:VDD = 5.0 V, Ta = 25°°C unless otherwise noted) CHARACTERISTIC SYMBOL CONDITION MIN. TYP. MAX. Input Voltage “H” Level VIH 0.8VDD VDD Input Voltage “L” Level VIL GND 0.2VDD Output Leakage Current IOH VOH = 17 V ±1.0 VOL IOL = 1.0 mA 0.3 VOH IOH = -1.0 mA VDD-0.3 ±6 % 4.66 5.3 5.94 mA 4.57 5.2 5.83 Output Voltage (SOUT) Output Current (Bit-Bit) IOL1 Output Current (Chip-Chip) IOL3 V(G, R)n = 1.0 RES = 11.2KΩ V(G, R)n = 1.0V, Vdd=5.0V RES = 11.2KΩ Vdd=3.3V Output Voltage Regulation % / VDD RES = 1400Ω, V(G, R)n = 1V to 3V ±0.1 ±0.5 Supply Voltage Regulation % / VDD V(G, R)n = 1.0V, RES = 1400Ω ±1.5 ±3.0 6 9.5 12.5 9.5 12.5 IDD(off)1 Supply Current “OFF” IDD(0ff)2 IDD(off)3 IDD(on)1 Supply Current “ON” IDD(on)2 Input Signal is static, RES = OPEN, (G, R)1~8 = off Input Signal is static, RES = 2800Ω, (G, R) 1~8 = off Input Signal is static, RES = 1400Ω, (G, R) 1~8 = off Input Signal is static, RES = 2800Ω, (G, R) 1~8 = on Input Signal is static, RES = 1400Ω, (G, R) 1~8 = on 8x2-Bit Constant Current LED Drivers -5- UNIT V uA V %/V %/V mA Version：A.012 點晶科技股份有限公司 DM141 SILICON TOUCH TECHNOLOGY INC. Switching Characteristics (Ta = 25 °C unless otherwise noted) CHARACTERISTIC SYMBOL EN-(G, R)n tpLH TYP. MAX. UNIT VIH=VDD 60 ns 30 ns VIL=GND (“L” to “H”) (G, R)RES=1400Ω Propagation Delay Time MIN. VDD=5.0V Propagation Delay Time CONDITION EN-(G, R)n tpHL VL=3.3V RL=51Ω (“H” to “L”) CL=15pF Output Current Rise Time tor 90 ns Output Current Fall Time tof 17 ns MIN. TYP. MAX. UNIT 90 ns 35 ns CHARACTERISTIC SYMBOL VDD=3.3V Propagation Delay Time EN-(G, R)n tpLH VIH=VDD VIL=GND (“L” to “H”) (G, R)RES=1400Ω Propagation Delay Time CONDITION EN-(G, R)n tpHL VL=3.3V RL=51Ω (“H” to “L”) CL=15pF Output Current Rise Time tor 140 ns Output Current Fall Time tof 30 ns 8x2-Bit Constant Current LED Drivers -6- Version：A.012 點晶科技股份有限公司 DM141 SILICON TOUCH TECHNOLOGY INC. Timing Diagram 1. CLK-SIN, SOUT, (G,R)n tr tf twCLK CLK SIN 90% 50% 10% tsetup 90% 50% 10% twCLK 50% 50% thold 50% 50% tof tor 90% 50% 10% (G, R)n (current) 90% 50% 10% tpLH tpHL 50% 50% SOUT tpHL tpLH 2. CLK-LTH 50% CLK SIN “L” level = DATA HOLD LTH tw(LAT) 50% 50% tsetup(L) 3. EN-(G, R)n EN 50% 50% tpHL tpLH 50% 50% (G, R)n (current) 8x2-Bit Constant Current LED Drivers -7- Version：A.012 點晶科技股份有限公司 DM141 SILICON TOUCH TECHNOLOGY INC. Detailed Description Constant Current Output Value Setting The output current is determined by resistor value. The resistors connected between RES(G, R) pin and GND decide the base current output. Fig1. shows the approximate relation between resistor value and output current value. The resistor should be placed as close to Rext terminal as possible to avoid the noise influence 60.00 50.00 Iout (mA) 40.00 30.00 20.00 10.00 0.00 0 2 4 6 8 10 12 14 Rext (KOhm) Fig.1 Output Current Performance vs. Output Voltage In order to obtain the good constant current output performance, the minimum output voltage is necessary. 60.00 Iout (mA) 50.00 40.00 30.00 20.00 10.00 0.00 0 1 2 3 4 5 Vout (V) Fig. 2 8x2-Bit Constant Current LED Drivers -8- Version：A.012 點晶科技股份有限公司 DM141 SILICON TOUCH TECHNOLOGY INC. Serial_In Data, Serial_Out and Latch The SIN data will be clocked into the 16 bits shift register synchronized on the rising edge of CLK. And the data ‘1’ represents the corresponding current output ‘ON’, while the data ‘0’ stands for ‘OFF’. The data will be transferred into the latch as the LTH pin goes high. And the data will be latched when LTH goes low.The SERIAL_OUT data is shifted out on synchronization to the falling edge of CLOCK. The graph below depicts the timing of data serial-in and serial-out. 16 Clocks CLK 5V 0V SIN 5V 0V LTH 5V 0V EN 5V 0V SOUT 5V 0V Previous Data G1 ON OFF R1 ON OFF G2 ON OFF R2 ON OFF R7 ON OFF G8 ON OFF R8 ON OFF Package and Thermal Pad The IC’s thermal pad (QFN) which is internally connected to the bottom side of chip should be connected to GND. And, good PCB layout pattern conducted to thermal pad will have better performance in thermal effect. Due to the small size and low profile, the majority of heat generated by the die within this package is dissipated through the thermal pad to PCB. The PCB configuration and metal layers embedded in the PCB become important to achieving good thermal performance. By increasing the embedded copper area, the thermal performance will be improved. Thermal vias which conduct heat from the surface of the PCB to the ground plane are necessary. More vias may improve the package thermal performance. 8x2-Bit Constant Current LED Drivers -9- Version：A.012 點晶科技股份有限公司 DM141 SILICON TOUCH TECHNOLOGY INC. Typical Application VDD VLED A1 R-G Dual Color 8X8 LED Module A2 A3 A4 A5 A6 A7 Controller A8 SIN CLK LTH EN VDD G1 R1 G2 R2 G3 R3 G4 R4 G5 R5 G6 R6 G7 R7 G8 R8 VDD 0.1 uF GND DM141 8x2 Channels Constant Current LED Driver GRES 8x2-Bit Constant Current LED Drivers SOUT To Next Stage RRES -10- Version：A.012 點晶科技股份有限公司 DM141 SILICON TOUCH TECHNOLOGY INC. Typical Application VDD 0.1 uF GND RRES SOUT DM141 8x2 Channels Constant Current LED Driver G8 R8 G7 R7 G6 R6 G5 R5 G4 R4 G3 R3 G2 R2 G1 R1 EN LTH CLK SIN GRES VLED R G R B Full-Color LED Pixel Cluster DM141 8x2 Channels Constant Current LED Driver GND VDD GRES R8 G8 R7 G7 R6 G6 R5 G5 R4 G4 R3 G3 R2 G2 SIN CLK LTH EN R1 G1 Controller SOUT RRES 0.1 uF 8x2-Bit Constant Current LED Drivers -11- Version：A.012 點晶科技股份有限公司 DM141 SILICON TOUCH TECHNOLOGY INC. Package Outline QFN32 TOP VIEW BOTTOM VIEW D D2 0.25 C 25 32 25 24 8 17 24 1 17 8 L E E2 e 1 32 0.25 C 9 16 16 9 e b 0.10 M C AB A 0.10 C A3 A1 SEATING PLANE SYMBOL A A1 A3 B D D2 E E2 e L y MIN. 0.70 0 0.18 1.25 1.25 0.30 DIMENSION (MM) NOM. 0.75 0.02 0.25 REF 0.23 5.00 BSC 2.70 5.00 BSC 2.70 0.50 BSC 0.40 0.10 y C MAX. 0.80 0.05 MIN. 27.6 0 0.30 7.09 3.25 49.21 3.25 49.21 0.50 11.81 DIMENSION (MIL) NOM. 29.5 0.79 9.84 REF 9.06 196.85 BSC 106.30 196.85 BSC 106.30 19.69 BSC 15.75 3.94 MAX. 31.5 1.97 11.81 127.95 127.95 19.69 Note: 1.DIMENSIONING AND TOLERANCING CONFORM TO ASME Y145.5M-1994. 2. REFER TO JEDEC STD. MO-220 WHHD-2 ISSUE A 8x2-Bit Constant Current LED Drivers -12- Version：A.012 點晶科技股份有限公司 DM141 SILICON TOUCH TECHNOLOGY INC. Package Outline SDIP28 B e E A A2 E1 Θ D L A1 SEATING PLANE 0.018typ. 0.060typ. 0.100typ. SYMBOLS A A1 A2 D E1 E L e B θ DIMENSION IN MIN. NOM. 0.015 0.125 0.130 1.385 1.390 0.283 0.288 0.31 BSC 0.115 0.130 0.330 0.350 0 7 INCH MAX. 0.210 0.135 1.400 0.293 0.150 0.370 15 Note: 1. JEDEC OUTLINE : N/A 8x2-Bit Constant Current LED Drivers -13- Version：A.012 點晶科技股份有限公司 DM141 SILICON TOUCH TECHNOLOGY INC. Package Outline SSOP28 D E E1 DETAIL A c 0.1MM e b A1 0.25 MM A A2 C GAUGE PLANE R R SEATING PLANE L DETAIL A SYMBOLS NOTES: 1. JEDEC OUTLINE : MO-15D AH A A1 A2 b C e D E E1 L R θ 2. DIMENSION D AND E1 DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS, BUT DOES INCLUDE MODE MISMATCH AND ARE MEASURED AT DATUM PLANE, MOLD PARTING LINE. MOLD FLASH OR PROTRUSION SHALL NOT EXCEED 0.2MM PER SIDE. 3.DIMENSION b DOES NOT INCLUDE DAMBAR PROTRUSION/ INTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.13mm TOTAL IN EXCESS OF b DIMENSION AT MAXIMUM MATERIAL CONDITION. DAMBAR INTRUSION SHALL NOT REDUCE DIMENSION b BY MORE THAN 9.07mm AT LEAST MATERIAL CONDITION. 8x2-Bit Constant Current LED Drivers -14- DIMENSION IN MM MIN. NOM. MAX. 2.0 0.05 1.62 1.75 1.85 0.22 0.38 0.09 0.25 0.65 BSC 9.9 10.20 10.50 7.4 7.8 8.2 5.00 5.30 5.60 0.55 0.75 0.95 0.09 0 4 8 Version：A.012 θ 點晶科技股份有限公司 DM141 SILICON TOUCH TECHNOLOGY INC. The products listed herein are designed for ordinary electronic applications, such as electrical appliances, audio-visual equipment, communications devices and so on. Hence, it is advisable that the devices should not be used in medical instruments, surgical implants, aerospace machinery, nuclear power control systems, disaster/crime-prevention equipment and the like. Misusing those products may directly or indirectly endanger human life, or cause injury and property loss. Silicon Touch Technology, Inc. will not take any responsibilities regarding the misusage of the products mentioned above. Anyone who purchases any products described herein with the above-mentioned intention or with such misused applications should accept full responsibility and indemnify. Silicon Touch Technology, Inc. and its distributors and all their officers and employees shall defend jointly and severally against any and all claims and litigation and all damages, cost and expenses associated with such intention and manipulation. 8x2-Bit Constant Current LED Drivers -15- Version：A.012