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SAMHOP Microelectronics Corp. The information in this document is subject to change without notice. c SAMHOP Microelectronics Corp. All Rights Reserved. 1007 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 : info@samhop.com.tw Page 1 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER GENERAL DESCRIPTION The SM16705P/F/FN are specifically designed for LED display constant current drivers. 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. FEATURES * 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 : Output-GND Voltage 0.4V 0.7V Current Matching 6.0% 6.0% Output Current 5 ~ 40mA 5 ~ 90mA PIN ASSIGNMENTS GND SERIAL-IN CLOCK LATCH OUT0 OUT1 OUT2 OUT3 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VDD R-EXT SERIAL-OUT ENABLE OUT7 OUT6 OUT5 OUT4 Part Number SM16705P SM16705F SM16705FN Package Type 16pin DIP 16pin SOP 16pin SSOP SM16705 Page 2 V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER PIN DESCRIPTION Pin NO. 1 2 3 I I I/O Pin Name GND SERIAL-IN CLOCK GND terminal Terminal of serial-data input to the shift register. Input terminal of a clock for shift register on rising edge. Input terminal of data strobe. Latches pass data with "H" level input of LATCH-terminal, and hold data with "L" level input. Constant Current-sinking output terminals. 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. 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. Function Description 4 I LATCH 5~12 O OUT0~7 13 I ENABLE 14 15 16 O I/O SERIAL-OUT R-EXT VDD Page 3 V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER TRUTH TABLE CLOCK UP UP UP DOWN DOWN LATCH H L H X X ENABLE L L L L H SERIAL-IN Dn Dn + 1 Dn + 2 Dn + 3 Dn + 3 OUT0 ... OUT5 ... OUT7 Dn ... D n - 5 ... D n - 7 No change Dn + 2 ... D n - 3 ... D n - 5 Dn + 2 ... D n - 3 ... D n - 5 Off SERIAL-OUT Dn - 8 Dn - 7 Dn - 6 Dn - 5 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 VDD RIN(Up) 2. LATCH terminal VDD ENABLE LATCH RIN(Down) GND GND 3. CLOCK, SERIAL-IN terminal VDD CLOCK, SERIAL-IN GND 4. SERIAL-OUT terminal VDD SERIAL-OUT GND Page 4 V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER BLOCK DIAGRAM OUT0 R-EXT I-REG. OUT1 OUT7 ENABLE Q ST D Q ST D Q ST D LATCH SERIAL-IN CLOCK DQ CK DQ CK DQ CK DQ CK SERIALOUT TIMING DIAGRAM CLOCK SERIAL-IN LATCH ENABLE OUT0 OUT1 OUT2 OUT7 SERIAL-OUT ..... 5V 0V 5V 0V 5V 0V 5V 0V On Off On Off On Off On Off 5V 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 Supply Voltage Input Voltage Output Current Output Voltage Clock Frequency GND Terminal Current Power Dissipation Thermal Resistance Operating Termerature Storage Temperature (Note) Symbol VDD VIN IOUT VOUT fCLK IGND PD Rth (j-a) Topr Tstg Rating 0 ~ 7.0 - 0.4 ~ VDD +0.4 90 - 0.5 ~ 20.0 25 720 1.47 (DIP : FREE AIR, Ta = 25 oC) 0.78 (SOP/ SSOP : ON PCB, Ta = 25 oC) 85 (DIP : FREE AIR, Ta = 25 oC) 160 (SOP/ SSOP : ON PCB, Ta = 25 oC) -40 ~ 85 -55 ~ 150 Unit V V mA V MHz mA W oC /W oC oC 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 VIH Input Voltage VIL 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 Power Dissipation tw LAT tw CLK tw EN tsetup(D) thold (D) tsetup(L) fCLK PD Condition OUTn,DC test circuit SERIAL-OUT SERIAL-OUT Min. 3.3 5 0.7 VDD -0.3 20 20 500 20 20 20 Typ. 5.0 Max. 5.5 15.0 88 1.0 -1.0 VDD +0.3 0.3 VDD 25 0.82 0.40 Unit V V mA V ns ns ns ns ns ns MHz W VDD = 4.5 ~ 5.5V Cascade operation Ta = 85oC(DIP FREE AIR) Ta = 85oC (SOP/ SSOP ON PCB) Page 6 V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER ELECTRICAL CHARACTERISTICS (VDD = 5.0V, Ta = 25oC unless otherwise noted) Characteristic Symbol Condition Min. 0.7 VDD GND Typ. Max. Unit Input Voltage "H" Level "L" Level VIH VIL VDD 0.3 VDD 10 V Output Leakage Current IOUT VOH = 15.0V A Output Voltage VOL SERIAL-OUT VOH IOUT1 IOL = 1.0mA IOH = -1.0mA VCE = 0.7V VCE = 0.4V IOUT = 40mA VCE = 0.4V REXT = 470 (Include skew) REXT = 470 4.6 34.1 33.7 40.0 39.5 1.5 0.4 V 45.9 45.3 4.0 Output Current 1 IOUT2 IOUT1 mA Current Skew % Output Current 2 IOUT3 VCE = 0.7V IOUT = 75mA VCE = 0.7V REXT = 240 66.3 78.0 89.7 mA Current Skew IoUT3 REXT = 240 1.5 4.0 % Supply Voltage Regulation % / VDD REXT = 470, Ta = -40 ~ 85oC 2.5 5.0 %/V Pull-Up Resistor Pull-Down Resistor RIN (up) RIN (down) IDD (off) 1 "OFF" IDD (off) 2 IDD (off) 3 IDD (on) 1 "ON" IDD (on) 2 REXT =OPEN, OUT0 ~ 7 = off REXT =470, OUT0 ~ 7 = off REXT =240, OUT0 ~ 7 = off REXT =470, OUT0 ~ 7 = on REXT =240, OUT0 ~ 7 = on 150 100 3.5 6.5 6.0 10.0 300 200 1.0 5.0 8.0 7.0 13.0 600 400 1.5 8.0 15.0 18.0 28.0 K K Supply Current mA Page 7 V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER SWITCHING CHARACTERISTICS (Ta = 25 oC unless otherwise noted) Characteristic SERIAL-IN-OUTn Propagation Delay Time ("L" to "H") LATCH-OUTn Symbol Condition Min. Typ. 180 180 180 25 130 130 130 22 130 130 Max. Unit 360 360 ns 360 40 360 360 ns 360 40 400 ns 400 tpLH ENABLE-OUTn CLOCK -SERIAL-OUT SERIAL-IN-OUTn VDD = 5.0V REXT = 470 VL = 3.0V RL = 62 CL = 10 pF tor tof 100 100 Propagation Delay Time ("H" to "L") LATCH-OUTn tpHL ENABLE-OUTn CLOCK -SERIAL-OUT Output Rise Time Output Fall Time Page 8 V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER TEST CIRCUIT DC Characteristic IDD VDD ENABLE IIL,IIH CLOCK LATCH VIL,VIH SERIAL-IN R-EXT lrext GND OUT7 SERIAL-OUT IOL, IOH OUT0 IOUT AC Characteristic VDD ENABLE VIL,VIH SWMATRIX CLOCK LATCH SERIAL-IN R-EXT GND RL OUT0 CL OUT7 SERIAL-OUT 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 tw CLK 90% 50% 10% tsetup(D) 50% thold(D) 50% tor 90% 50% 10% tpLH tpHL 90% 50% 10% tpLH tpHL 90% 50% 10% tof 90% 50% 10% tf tw CLK 90% 50% 10% 50% CLOCK SERIAL-IN OUTn (current) SERIAL-OUT 2. CLOCK-LATCH 50% 50% CLOCK SERIAL-IN "L" level = DATA HOLD 50% 50% LATCH tW LAT tsetup(L) 3. ENABLE-OUTn tW EN ENABLE 50% tpLH 50% 50% tpHL 50% OUTn (Current) Page 10 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 1.6 100 90 P FREE AIR 80 REXT - IOUT Power dissipation PD (W/IC) 1.4 1.2 1 0.8 0.6 0.4 0.2 IOUT ( mA ) 70 60 50 40 30 20 10 0 IOUT {(1.25 / REXT ()} x14.7 VOUT = 0.7V VDD = 5.0V F/FN ON PCB F/FN FREE AIR 0 -40 -20 0 20 40 60 80 200 300 500 1,000 2,000 3,000 5,000 Ambient Temerature Ta (oC) REXT () Fig. 1 Output Current - Output Voltage Vce-Ice 0.09 0.08 0.07 0.06 0.05 R=470 R=240 Ice 0.04 0.03 0.02 0.01 R=3900 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 VDD SCAN VDD VDD VLED = 3 ~ 4 (V) SDM4952 SDM4953 VDS SDM9435A Vf OUT0 VOUT OUT7 GND SERIAL-OUT ENABLE CLOCK LATCH SERIAL-IN R-EXT CPU VDD ENABLE CLOCK LATCH SERIAL-IN R-EXT VDD OUT0 VOUT OUT7 GND SERIAL-OUT Vf [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 Unit : mm 16 9 6.604 + 0.054 0 ~ 15 3.3 + 0.1 0.508 2.54 1.524 0.4572 1 8 19.18 + 0.51 Weight: 1.11g(Type) Page 13 3.175 + 0.254 9.02 + 0.508 7.62 V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER PACKAGE OUTLINE SM16705F 16 PIN SOP 16 9 4.0MAX 6.2MAX Unit : mm 1 8 1.27 0.406 1.5 MAX 10 1.75 MAX 0.25 0.25 1.27 Page 14 V.2.10 SAMHOP Microelectronics Corp. 8-BIT CONSTANT CURRENT LED DRIVER PACKAGE OUTLINE SM16705FN 16 PIN SSOP Unit : mm 16 9 4.0 MAX 1 8 0.635 0.3 MAX 1.5 MAX 5.0 MAX 1.75 MAX 6.2 MAX 0.254 0.25 0.406~1.27 Page 15 V.2.10 |
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