DM115B Version Issue Date File Name Total Pages : A.001 : 2007/02/07 : SP-DM115B-A.001 : 17 8-Bit CONSTANT CURRENT LED DRIVERS with 3.3v ~ 5v supply voltage 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. Tel：886-3-5645656 Fax：886-3-5645626 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DM115B DM115B 8-Bit CONSTANT CURRENT LED DRIVERS with 3.3v ~ 5v Supply Voltage General Description The DM115B is the constant current driver specifically designed for LED display applications. The value of constant current can be varied using an external resistor. The devices include an 8-bit shift register, latches, and constant current drivers on a single Silicon CMOS chip. Features z z z z z z z Maximum Output Voltage: Maximum Clock Frequency: Power Supply Voltage: CMOS Compatible Input Package: Package and Pin Layout: 17V 25MHz (Cascade Operation) 3.3V to 5.0V PDIP16, SOP16, SSOP16 Pin layout and functionality are similar to those of the ST2221A. (Each characteristic value is different.) Constant Current Matching: (Ta = 25°C、VDD = 5.0V) Chip-to-Chip: ± 10.0% Bit-to-Bit: ± 4.0% @ IOUT = 20 ~ 60mA ± 6.0% @ IOUT = 5 ~ 20mA 8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage Version:A.001 Page 1 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DM115B Pin Connection (Top view) VDD GND SERIAL-IN 1 2 16 15 R-EXT CLOCK 3 4 14 SERIAL-OUT 5 13 12 ENABLE OUT7 OUT1 6 11 OUT6 OUT2 OUT3 7 10 9 OUT5 OUT4 LATCH OUT0 8 Block Diagram R-EXT OUT7 OUT1 OUT0 I-REG. ENABLE Delay Unit Delay Unit Delay Unit Q Q Q ST D ST ST D D LATCH SERIAL-IN D CK Q D CK Q D Q SERIAL-OUT CK CLOCK 8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage Version:A.001 Page 2 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DM115B Timing Diagram 3.3/5V CLOCK 0V 3.3/5V SERIAL IN 0V 3.3/5V LATCH 0V 3.3/5V ENABLE 0V OUT0 Off On OUT1 Off OUT2 Off On OUT7 Off 3.3/5V SERIAL-OUT 0V (Note) Latches are level sensitive (not edge triggered). LATCH-terminal = H level, latches become transparent; LATCH-terminal = L level, latches hold data. ENABLE-terminal = H level, all outputs (OUT0~7) are off. An external resistor is connected between R-EXT and GND for setting up the value of constant current. SERIAL-OUT changes state on the rising edges of clock. Pin Description PIN No. 1 2 3 4 5~12 13 14 15 16 PIN NAME GND SERIAL-IN CLOCK LATCH OUT0~7 ENABLE SERIAL-OUT R-EXT VDD FUNCTION GND terminal Input terminal of a data shift register Input terminal of a clock for shift register Input terminal for data strobe Output terminals Input terminal for output enable (active low) Output terminal of a data shift register Input terminal of an external resistor 3.3/5V Supply voltage terminal 8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage Version:A.001 Page 3 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DM115B Equivalent Circuit of Inputs and Outputs 1. ENABLE terminal 2. LATCH terminal VDD VDD RIN(up) INPUT INPUT RIN(down) GND 3. CLOCK, SERIAL-IN terminal GND 4. SERIAL-OUT terminal VDD INPUT GND 8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage VDD SERIAL_OUT GND Version:A.001 Page 4 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DM115B Maximum Ratings (Ta = 25°C, Tj(max) = 150°C) CHARACTERISTIC SYMBOL RATING UNIT Supply Voltage Input Voltage VDD VIN 0 ~ 7.0 -0.4 ~ VDD+0.4 V V Output Current IOUT 60 mA Output Voltage Clock Frequency VOUT fCLK -0.3 ~ 17 25 V MHz GND Terminal Current IGND 500 mA Power Dissipation PD Thermal Resistance Rth(j-a) Storage Temperature Tstg 1.64 ( PDIP-16 : Ta=25°C) 1.08 ( SOP-16 : Ta=25°C) 0.8 ( SSOP-16 : Ta=25°C) single-layer 1.47 ( SSOP-16 : Ta=25°C) 4-layer 76 ( PDIP-16 ) 115 ( SOP-16 ) 155 ( SSOP-16 ) single-layer 85 (SSOP-16) 4-layer -55 ~ 150 W °C/W °C Recommended Operating Condition CHARACTERISTIC Supply Voltage Output Voltage Operating temperature Output Current SYMBOL VDD VOUT TOPR IO IOH IOL OUTn SERIAL-OUT SERIAL-OUT VIH VIL Input Voltage LATCH Pulse Width CLOCK Pulse Width Set-up Time for DATA Hold Time for DATA Set-up Time for LATCH Clock Frequency Power Dissipation tw LAT tw CLK tsetup(D) thold(D) tsetup(L) fCLK PD CONDITION ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ MAX. 5.5 17 85 60 1.0 -1.0 ⎯ 0.7VDD ⎯ VDD+0.3 ⎯ -0.3 ⎯ 0.3VDD VDD = 3.0 ~ 5.5 V 15 15 10 5 15 ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ 2 chips cascade operation Ta = 85°C(PDIP-16) Ta = 85°C(SOP-16) Ta = 85°C(SSOP-16) MIN. 3.0 ⎯ -40 ⎯ ⎯ ⎯ ⎯ TYP. 8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage UNIT V V ℃ mA V 25 0.85 0.56 0.41 Version:A.001 ns ns ns ns ns MHz W Page 5 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DM115B Electrical Characteristics (VDD = 5.0 V, Ta = 25°C unless otherwise noted) CHARACTERISTIC Input Voltage “H” Level Input Voltage “L” Level Output Leakage Current Output Voltage ( S - OUT) Output Current (Bit-Bit) Output Current (Chip-Chip) Output Voltage Regulation Pull-Up Resistor Pull-Down Resistor Supply Current “OFF” Supply Current “ON” Supply Current “OFF” Supply Current “ON” SYMBOL VIH VIL IOH VOL VOH VOL VOH ΔIout Iout % / Vout RIN(up) RIN(down) CONDITION ⎯ ⎯ VOUT = 1.2V (1 channel on) ⎯ ±1.5 ±4 % REXT = 780Ω 18.0 20.0 22.0 mA ⎯ 0.1 400 200 5.0 0.5 600 300 %/V KΩ KΩ Vdd = 3.3V ~ 5.0V ⎯ ⎯ Idd (off) VDD=3.3V Idd (on) VDD=3.3V 4.6 ⎯ 200 100 ⎯ 0.4 uA V ⎯ REXT = 300Ω, OUT0~7 = off 11.0 REXT = 300Ω, OUT0~7 = on ⎯ 11.0 ⎯ REXT = OPEN, all outputs off 1.1 REXT = 300Ω, OUT0~7 = off ⎯ ⎯ 7.2 ⎯ ⎯ REXT = 300Ω, OUT0~7 = on ⎯ 7.2 ⎯ 8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage V 0.4 ⎯ ⎯ VDD=5V VDD=5V ⎯ ⎯ ⎯ ⎯ REXT = OPEN, all outputs off (on) UNIT REXT = 780Ω Idd (off) Idd MAX. VDD 0.3VDD 1.0 2.7 IOL = 1.0 mA, VDD=5V IOH = -1.0 mA, VDD=5V IOL = 1.0 mA, VDD=3.3V IOH = -1.0 mA, VDD=3.3V (1 channel on) TYP. ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ VOH = 17 V VOUT = 1.2V MIN. 0.7VDD GND Version:A.001 mA mA Page 6 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DM115B Switching Characteristics (Ta = 25 °C unless otherwise noted) CHARACTERISTIC Propagation ENABLE-OUT0 Delay Time (“L” to “H”) CLK-SOUT Propagation ENABLE-OUT0 Delay Time (“H” to “L”) CLK-SOUT Output Current Rise Time SYMBOL Output Current Fall Time tpLH tpHL tor tof CONDITION VDD=5.0V VIH=VDD VIL=GND REXT=630Ω VL=5.0V RL=150Ω CL=15pF MIN. TYP. MAX. ⎯ 66 132 UNIT ⎯ 16 20 ⎯ 81 162 ⎯ 16 20 ⎯ 30 60 ns ⎯ 32 50 ns ns ns Note: (Delay between outputs) The DM115B also incorporated the delay unit between outputs. The delay time is 4 ns(typ.), out7 has no delay, out5 has 4 ns delay, out 3 has 8 ns delay, and then out 1, out 0, out 2, out 4, out6. The delay is to prevent large current impulse. 8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage Version:A.001 Page 7 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DM115B Test Circuit DC characteristic IDD VDD OUT0 ENABLE IOL CLOCK IIL ,IIH LATCH OUT7 SERIAL-IN VIL ,VIH R-EXT GND SERIAL-OUT I ref AC characteristic VDD VIL ,VIH RL OUT0 ENABLE CL SW- CLOCK MATRIX LATCH SERIAL-IN RL OUT7 SERIAL-OUT R-EXT GND CL CL 8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage VL Version:A.001 Page 8 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DM115B Timing Diagram 1. CLOCK-SERIAL OUT, OUTn tr tf twCLK CLOCK SERIAL-IN 90% 50% 10% tsetup 90% 50% 10% twCLK 50% thold 50% 50% tof tor 90% 50% 10% OUTn (current) 90% 50% 10% tpLH tpHL 50% 50% SERIAL-OUT tpHL tpLH 2. CLOCK-LATCH 50% CLOCK SERIAL-IN “L” level = DATA HOLD tw(LAT) LATCH 50% 50% tsetup(L) 3. ENABLE-OUTn (Current) ENABLE 50% 50% tpHL tpLH 50% 50% OUTn 8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage Version:A.001 Page 9 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DM115B Output Current vs. External Resistor 70 60 Iout (mA) 50 40 30 20 10 0 0 200 400 600 800 1000 1200 1400 1600 1800 Rext (Ohm) Iout ≈ 1.3V / Rext * 12.5 Output Current Performance vs. Output Voltage 60 55 50 45 Iout (mA) 40 35 30 25 20 15 10 5 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 Vout (V) Note: In order to obtain a good constant current output, a suitable output voltage is necessary. Users can get related information about the minimum output voltage from the above graph. 8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage Version:A.001 Page 10 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DM115B Pd - Ta 1.80 1.60 DIP 1.40 Pd (W) 1.20 SOP 1.00 SSOP 0.80 0.60 0.40 0.20 0.00 0 20 40 60 Ta 80 100 120 140 160 120 140 160 Imax - Ta ( DM115 ) 70 60 SOP DIP 50 Im a x (m A) SSOP 40 30 20 10 0 0 20 40 60 80 Ta 100 Note As the power dissipation of a semiconductor chip is limited its package and ambient temperature, this device requires a maximum output current be calculated for a given operating condition. The maximum allowable power consumption (Pd (max)) of this device is calculated as follows: (Tj (junction temperature) (max) - Ta (ambient temperature) )(°C ) Pd (max)(Watt ) = Rth (°C / Watt ) Based on the Pd (max), the maximum allowable current can be calculated as follows: Iout = ( Pd – VDD‧IDD) / ( # outputs‧Vo‧Duty ) 8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage Version:A.001 Page 11 Vo 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DM115B System Configuration Example [1] Output current (IOUT) Sink current is set by the external resistor as shown in figure (Iout vs. Rext). [2] LED supply voltage (VLED) setup VLED = VCE ( Tr Vsat ) + Vf ( LED forward voltage ) + VO ( IC supply voltage) To prevent too much power dissipated by the device due to higher VLED , an additional R can be used to reduce the Vout when the outputs consume current: V L E D = 3 ~ 4 (V ) V DD SCAN OUT0 ENABLE CLO CK LATCH OUT7 S E R IA L -IN R -E X T G N D R S E R IA L -O U T CPU OUT0 ENABLE CLO CK LATCH OUT7 S E R IA L -IN R -E X T G N D R= S E R IA L -O U T VLED − Vf − VO (min) IO (max) • Bit (max) Note This device has only one ground pin shared by signal, output sink current, and power ground. It is advisable to pattern the ground layout with minimized inductance such that the switching noise induced by the input signals and the output sink current would not cause chip malfunction. To prevent the drivers’ outputs from damage by overshoot stress, it is also advisable not to turn off the drivers and scan transistors simultaneously. 8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage Version:A.001 Page 12 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DM115B Package Outline PDIP16 7.62 9.02±0508 9 6.35±0.13 16 0~15° Unit: mm 8 1 19.69MAX 1.524 0.635±0.254 5.33MAX 3.3±0.508 0.38MIN 3.3±0.1 19.18±0.51 0.4572 2.54 Weight : 1.11g(Typ.) 8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage Version:A.001 Page 13 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DM115B Package Outline SOP16 9 1 8 4.0MAX 16 0.56 6.2MAX Unit: mm 0.51 1.27 0.25 1.75 0.25 1.5 10 8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage 1.27 Version:A.001 Page 14 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DM115B Package Outline SSOP16 Unit: mm 3.91 5.99 9 16 8 1 0.229 0.3Max 0.254 0.15 1.5 4.9 1.63MAX 0.635 8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage 0.635 Version:A.001 Page 15 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DM115B 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. 8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage Version:A.001 Page 16