㆔合微科股份㈲限公司 SAMHOP Microelectronics Corp. The information in this document is subject to change without notice. c SAMHOP Microelectronics Corp. All Rights Reserved. 台北縣新店市民權路100號7樓 7F,No.100,Min-Chyuan Road, Hsintien, Taipei Hsien, Taiwan, R.O.C. TEL: 886-2-2218-3978/2820 FAX: 886-2-2218-3320 Email : [email protected] Page 1 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER GENERAL DESCRIPTION FEATURES The SM16705P/F/FN are specifically designed for LED display constant current drivers. * Constant Current Output : can setup all output current with one resistor for 5 to 90mA. * Maximum Clock Frequency : fCLK = 25 (MHz) (Cascade Connect Operate, Topr = 25oC) * 5V CMOS Compatible Input * 16 pin DIP, SOP or SSOP package * Constant Output Current Matching : This constant current output circuits is able to setup by external resistor (IOUT = 5 ~ 90mA). This IC is monolithic integrated circuit designed to be used together with Bi-CMOS process. The devices consist of 8bit shift register, latch, ANDGATE and Constant Current Drivers. Output-GND Voltage Current Matching Output Current ≧0.4V ±6.0% 5 ~ 40mA ≧0.7V ±6.0% 5 ~ 90mA PIN ASSIGNMENTS GND 1 16 VDD SERIAL-IN 2 15 R-EXT CLOCK 3 14 SERIAL-OUT LATCH 4 13 ENABLE OUT0 5 12 OUT7 OUT1 6 11 OUT6 OUT2 7 10 OUT5 OUT3 8 9 OUT4 Part Number Package Type SM16705P 16pin DIP SM16705F 16pin SOP SM16705FN 16pin SSOP SM16705 Page 2 V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER PIN DESCRIPTION Pin NO. I/O 1 Pin Name GND Function Description GND terminal 2 I SERIAL-IN 3 I CLOCK Input terminal of a clock for shift register on rising edge. 4 I LATCH Input terminal of data strobe. Latches pass data with "H" level input of LATCH-terminal, and hold data with "L" level input. 5~12 O OUT0~7 Constant Current-sinking output terminals. 13 I ENABLE Input terminal of output enable. All outputs (OUT0~7) do off with "H" level input of ENABLE-terminal and do on with "L" level input. 14 O SERIAL-OUT 15 I/O R-EXT 16 VDD Terminal of serial-data input to the shift register. Output terminal of serial-data for next SERIAL-IN terminal. An external resistor at this terminal establishes all of the output current. Supply voltage terminal. Page 3 V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER TRUTH TABLE CLOCK LATCH ENABLE SERIAL-IN OUT0 … OUT5 … OUT7 SERIAL-OUT UP H L Dn Dn … D n - 5 … D n - 7 Dn - 8 UP L L Dn + 1 No change Dn - 7 UP H L Dn + 2 Dn + 2 … D n - 3 … D n - 5 Dn - 6 DOWN X L Dn + 3 Dn + 2 … D n - 3 … D n - 5 Dn - 5 DOWN X H Dn + 3 Off Dn - 5 Note : 1.OUT0~7=on when Dn="H" ; OUT0~7=off when Dn="L". 2. In order to ensure that the level of the power supply voltage is correct, an external resistor must be connected betwen R-EXT and GND. EQUIVALENT CIRCUIT OF INPUTS AND OUTPUTS 1. ENABLE terminal 2. LATCH terminal VDD VDD RIN(Up) ENABLE LATCH RIN(Down) GND 3. CLOCK, SERIAL-IN terminal GND 4. SERIAL-OUT terminal VDD VDD CLOCK, SERIAL-IN SERIAL-OUT GND GND Page 4 V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER BLOCK DIAGRAM OUT0 R-EXT OUT1 OUT7 I-REG. ENABLE Q Q Q ST D ST D ST D LATCH SERIAL-IN D Q D Q D Q D Q CK CK CK CK SERIALOUT CLOCK TIMING DIAGRAM 5V CLOCK 0V 5V SERIAL-IN 0V 5V LATCH 0V 5V ENABLE 0V On OUT0 Off On OUT1 Off On OUT2 Off ..... On OUT7 Off 5V SERIAL-OUT 0V Note : Latches are level sensitive, not rising edges sensitive and not synchronous CLOCK. Input of LATCH-terminal to H Level, data passes latches, and input of LATCH -terminal to L level, data hold latches. Input of ENABLE-terminal to H Level, all output (OUT0 ~ 7) do off. Page 5 V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER MAXIMUM RATINGS (Ta = 25oC) Characteristic Symbol Rating Unit Supply Voltage VDD 0 ~ 7.0 V Input Voltage VIN - 0.4 ~ VDD +0.4 V Output Current IOUT 90 mA Output Voltage VOUT - 0.5 ~ 20.0 V Clock Frequency fCLK 25 MHz GND Terminal Current IGND 720 mA Power Dissipation Thermal Resistance PD Rth (j-a) 1.47 (DIP : FREE AIR, Ta = 25 oC) W 0.78 (SOP/ SSOP : ON PCB, Ta = 25 oC) 85 (DIP : FREE AIR, Ta = 25 oC) oC 160 (SOP/ SSOP : ON PCB, Ta = 25 oC) /W Operating Termerature Topr -40 ~ 85 oC Storage Temperature Tstg -55 ~ 150 oC (Note) DIP : Ambient temperature derated above 25 oC in the proportion of 11.8mW / oC SOP/ SSOP: Ambient temperature delated above 25 oC in the proportion of 6.3mW / oC RECOMMENDED OPERATING CONDITION (Ta = -40 ~ 85 oC unless otherwise noted) Characteristic Supply Voltage Output Voltage Output Current Symbol VDD VOUT IOUT IOH IOL Condition Min. Typ. Max. Unit － － 3.3 － 5.0 － － － － 5.5 15.0 88 1.0 -1.0 V V VDD +0.3 0.3 VDD － － － － － － OUTn,DC test circuit SERIAL-OUT SERIAL-OUT 5 － － VIH － 0.7 VDD － VIL － -0.3 － 20 20 500 20 20 20 － － － － － － － － － － － － Input Voltage LATCH Pulse Width CLOCK Pulse Width ENABLE Pulse Width Set-up Time for DATA Hold Time for DATA Set-up Time for LATCH Clock Frequency tw LAT tw CLK tw EN tsetup(D) thold (D) tsetup(L) fCLK Power Dissipation PD VDD = 4.5 ~ 5.5V Cascade operation Ta = 85oC(DIP FREE AIR) Ta = 85oC (SOP/ SSOP ON PCB) Page 6 25 0.82 0.40 mA V ns ns ns ns ns ns MHz W V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER ELECTRICAL CHARACTERISTICS (V DD = 5.0V, Ta = 25oC unless otherwise noted) Characteristic Input Voltage Symbol Condition Min. Typ. Max. "H" Level VIH － 0.7 VDD － VDD "L" Level VIL － GND － 0.3 VDD Output Leakage Current Unit V IOUT VOH = 15.0V － － 10 VOL IOL = 1.0mA － － 0.4 VOH IOH = -1.0mA 4.6 － － IOUT1 VCE = 0.7V 34.1 40.0 45.9 IOUT2 VCE = 0.4V REXT = 470Ω (Include skew) 33.7 39.5 45.3 △ IOUT1 IOUT = 40mA VCE = 0.4V REXT = 470Ω － ±1.5 ±4.0 % IOUT3 VCE = 0.7V REXT = 240Ω 66.3 78.0 89.7 mA △ IoUT3 IOUT = 75mA VCE = 0.7V REXT = 240Ω － ±1.5 ±4.0 % Supply Voltage Regulation % / VDD REXT = 470Ω, Ta = -40 ~ 85oC － 2.5 5.0 %/V Pull-Up Resistor RIN (up) － 150 300 600 KΩ RIN (down) － 100 200 400 KΩ Output Voltage SERIAL-OUT Output Current 1 Current Skew Output Current 2 Current Skew Pull-Down Resistor "OFF" Supply Current µA V IDD (off) 1 REXT =OPEN, OUT0 ~ 7 = off － 1.0 1.5 IDD (off) 2 REXT =470Ω, OUT0 ~ 7 = off 3.5 5.0 8.0 IDD (off) 3 REXT =240Ω, OUT0 ~ 7 = off 6.5 8.0 15.0 IDD (on) 1 REXT =470Ω, OUT0 ~ 7 = on 6.0 7.0 18.0 IDD (on) 2 REXT =240Ω, OUT0 ~ 7 = on 10.0 13.0 28.0 mA mA "ON" Page 7 V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER SWITCHING CHARACTERISTICS (Ta = 25 oC unless otherwise noted) Characteristic Symbol Condition SERIAL-IN-OUTn Propagation Delay Time ("L" to "H") LATCH-OUTn Typ. Max. Unit － 180 360 － 180 360 tpLH ns ENABLE-OUTn － 180 360 CLOCK -SERIAL-OUT － 25 40 － 130 360 － 130 360 ENABLE-OUTn － 130 360 CLOCK -SERIAL-OUT － 22 40 100 130 400 SERIAL-IN-OUTn Propagation Delay Time ("H" to "L") Min. LATCH-OUTn tpHL Output Rise Time tor VDD = 5.0V REXT = 470Ω VL = 3.0V RL = 62Ω CL = 10 pF ns ns Output Fall Time tof Page 8 100 130 400 V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER TEST CIRCUIT DC Characteristic IDD VDD OUT0 ENABLE IOUT CLOCK IIL,IIH LATCH VIL,VIH OUT7 SERIAL-IN R-EXT SERIAL-OUT IOL, IOH GND lrext AC Characteristic RL VDD OUT0 ENABLE VIL,VIH SWMATRIX CL CLOCK LATCH OUT7 SERIAL-IN SERIAL-OUT R-EXT GND CL VL PRECAUTIONS FOR USING Utmost care is necessary in the design of the output line, VDD and GND line, since IC may be destroyed due to short-circuit between outputs, air contamination fault, or fault by improper grounding. Page 9 V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER TIMING WAVEFORM 1. CLOCK, SERIAL-IN, SERIAL-OUT, OUTn tr tf tw CLK tw CLK 90% 50% 10% 90% 50% 10% CLOCK tsetup(D) 50% thold(D) 50% 50% SERIAL-IN tor tof 90% 50% 10% 90% 50% 10% OUTn (current) tpLH tpHL 90% 50% 10% SERIAL-OUT 90% 50% 10% tpLH tpHL 2. CLOCK-LATCH 50% 50% CLOCK SERIAL-IN "L" level = DATA HOLD 50% 50% tW LAT LATCH tsetup(L) 3. ENABLE-OUTn tW EN ENABLE 50% 50% tpLH OUTn (Current) tpHL 50% Page 10 50% V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER Output Current - Duty (LED turn-on rate) Output Current - REXT Resistor Ta - PD REXT - IOUT 100 90 1.4 P FREE AIR 1.2 80 IOUT ( mA ) Power dissipation PD (W/IC) 1.6 1 F/FN ON PCB 0.8 0.6 F/FN FREE AIR IOUT ≒ {(1.25 / REXT (Ω)} ×14.7 70 60 VOUT = 0.7V VDD = 5.0V 50 40 30 0.4 20 0.2 0 -40 -20 0 20 40 60 10 0 80 200 300 500 1,000 2,000 3,000 5,000 REXT (Ω) Ambient Temerature Ta (oC) Fig. 1 Output Current - Output Voltage Vce-Ice 0.09 0.08 R=240Ω 0.07 0.06 0.05 R=470Ω Ice 0.04 0.03 0.02 0.01 R=3900Ω 0 -0.01 0 0.5 1 1.5 2 2.5 3 3.5 Vce Page 11 V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER [1] Output Current (IOUT) IOUT is set by the enternal resistor (R-EXT) as shown in Firgure1. [2] Total supply voltage (VLED) This device can operate at 0.4~0.7V (VOUT ). When a higher voltage is input to the device, the excess voltage is consumed inside the device, that leads to more power dissipation. In order to minimize power dissipation and loss, we would like to recommend to set the total supply voltage as shown below, VLED (total supply voltage)=VOUT (IC Supply Voltage)+ Vf (LED Forward voltage) + VDS (MOSFET Voltage Drop ) When the total supply is too high considering the power dissipation of this device, an additional R can decrease the supply voltage (VOUT). PATTERN LAYOUT VLED = 3 ~ 4 (V) VDD SCAN SDM4952 SDM4953 VDS SDM9435A VDD ENABLE CLOCK LATCH SERIAL-IN R-EXT Vf VDD OUT0 VOUT OUT7 GND SERIAL-OUT CPU VDD ENABLE CLOCK LATCH SERIAL-IN R-EXT VDD Vf OUT0 VOUT OUT7 GND SERIAL-OUT [3] Pattern Layout This device has only one ground pin that means signal ground pin and power ground pin are common. If ground pattern layout contains large inductance and impedance, and the voltage between ground and LATCH, CLOCK terminals exceeds 2.5V by switching noise during operation, this device may missoperate. So we would advise you to pay attention to pattern layout to minimize ground inductance. Page 12 V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER PACKAGE OUTLINE SM16705P 16 PIN DIP 1 8 0.508 1.524 7.62 3.175 + 0.254 3.3 + 0.1 19.18 + 0.51 2.54 9.02 + 0.508 9 6.604 + 0.054 16 0 ~ 15° Unit : mm 0.4572 Weight: 1.11g(Type) Page 13 V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER PACKAGE OUTLINE SM16705F 16 PIN SOP 9 1 8 4.0MAX 16 0.25 10 1.75 MAX 0.406 1.5 MAX 1.27 6.2MAX Unit : mm 1.27 0.25 Page 14 V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER PACKAGE OUTLINE SM16705FN 16 PIN SSOP Unit : mm 4.0 MAX 6.2 MAX 9 16 8 0.254 5.0 MAX 0.3 MAX 1.75 MAX 0.635 1.5 MAX 1 0.25 Page 15 0.406~1.27 V.2.10