AT1326 Preliminary Product Information 16-bit Constant Current LED Sink Driver Features General Description • Driver capability and output counts - 90mA×16 Bits • Power supply voltage range: 4.5V ~ 5.5V, constant output current range: 5 ~ 90 mA • Power supply voltage range: 3.3V ~ 4.4V, constant output current range: 5 ~ 45 mA • Maximum output terminal voltage: 17V • Data transfer rate: 25MHz • Output current adjusted through an external resistor • Output current accuracy: All output ON Supply Voltage 4.5V ~ 5.5V 3.3V ~ 4.4V The AT1326 is a constant current driver incorporating shift register and data latch. The output constant current can be set using an external resistor. All outputs will have virtually the same current levels. The device also incorporates thermal shutdown circuitry which turns constant current output off when the junction temperature exceeds the limit. Current Accuracy Between Channels Between ICs ＜±3% ＜±6% Output Current 10mA ~ 60mA 10mA ~ 45mA Block Diagram OUT0 OUT1 OUT14 OUT15 ENABLE LATCH Aimtron reserves the right without notice to change this circuitry and specifications. 7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 9/28/2006 REV: 0.2 Email: [email protected] 1 AT1326 Preliminary Product Information 16-bit Constant Current LED Sink Driver VDD R-EXT SDO ENABLE OUT15 OUT14 OUT13 OUT12 OUT11 OUT10 OUT9 OUT8 Pin Configurations 24 23 22 21 20 19 18 17 16 15 14 13 AT1326R 2 3 4 5 6 7 8 9 10 11 12 SDI LATCH OUT0 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 GND 1 CLK ▲▲▲▲▲▲ Ordering Information Part number AT1326R_GRE Package SSOP24-1.0mm, Green Marking ▲▲▲▲▲▲ ▲▲▲▲▲▲: Date Code *For more marking information, contact out sales representative directly Pin Description Pin NO. Symbol 1 GND 2 SDI 3 CLK 4 LATCH 5 to 20 21 22 23 24 Description GND terminal for control logic and current sink. Input terminal for serial data for data shift register. Input terminal for clock for data shift on rising edge. Input terminal for data strobe. When the LATCH input is driven High, data is not latched. When it is pulled Low, data is latched. OUT0 ~ OUT15 Constant-current output terminals. Input terminal for output enable. ENABLE All outputs ( OUT0 to OUT15 ) are turned off, when the ENABLE terminal is driven High. And are turned on, when the terminal is driven Low. SDO Output terminal for serial data input on SDI terminal R-EXT Input terminal used to connect an external resistor. This regulated the output current. VDD 3.3V/5V supply voltage terminal. 7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 9/28/2006 REV: 0.2 Email: [email protected] 2 AT1326 Preliminary Product Information 16-bit Constant Current LED Sink Driver Timing Diagram n = 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 CLK SDI LATCH ENABLE OFF OUT0 ON OFF OUT1 ON OFF OUT2 ON OFF ON OFF OUT15 ON SDO : don' t care Truth Table CLK OUT15 … OUT15 … OUT15 LATCH ENABLE SDI H L Dn L L Dn+1 H L Dn+2 Dn + 2 …. Dn - 5 …. Dn - 13 Dn-13 X L Dn+3 Dn + 2 …. Dn - 5 …. Dn - 13 Dn-13 X H Dn+3 Dn …. Dn - 7 …. Dn - 15 No Change Off SDO Dn-15 Dn-14 Dn-13 7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 9/28/2006 REV: 0.2 Email: [email protected] 3 AT1326 Preliminary Product Information 16-bit Constant Current LED Sink Driver Absolute Maximum Ratings*1 (Ta=+25°C) Parameter Supply Voltage Input Voltage Output Current Output Voltage Power Dissipation (on PCB)*2 Thermal Resistance (on PCB)*2 Operating Temperature Junction Temperature Storage Temperature range Minimum ESD Rating*3 Symbol VDD VIN IOUT VOUT Pd θJA Topr Tj Tstg HBM MM Rated Value Min. Max. -0.5 +6.0 -0.2 VDD+0.2 +90 -0.2 +17.0 1.00 120 -40 +85 +150 -55 +150 2 200 Unit V V mA/ch V W ˚C/W ˚C ˚C ˚C KV V 1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 2. The Powers dissipation is derated by 6.67mW/°C if device is mounted on PCB and PCB ambient temperature is above 25°C. 3. Device are ESD sensitive. Handling precaution recommended. The Human Body model is a 100pF capacitor discharged through a 1.5KΩ resistor into each pin. 7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 9/28/2006 REV: 0.2 Email: [email protected] 4 AT1326 Preliminary Product Information 16-bit Constant Current LED Sink Driver Electrical Characteristics (Ta =+25℃, VDD = 3.3V to 5.5V, unless otherwise noted) Parameter Symbol Max. 5.5 4.4 17.0 - ±1 - % - ±2 - % 5 5 0.7VDD GND 4.6 - 45.0 ±1 22.5 ±1 90 45 -1.0 1.0 VDD 0.3VDD 0.5 0.4 ±3 ±3 mA mA V V µA V V mA % mA % - ±0.1 - %/V - ±1 - %/V - - 2 mA 250 500 800 KΩ 250 500 800 KΩ IDD(off) 1 REXT=Open, OUT0 ~ OUT15 =Off IDD(off) 2 REXT=820Ω, OUT0 ~ OUT15 =Off - 4.5 - - 5.5 - IDD(off) 3 REXT =410Ω, OUT0 ~ OUT15 =Off IDD(on) 1 REXT =820Ω, OUT0 ~ OUT15 =On - 7.0 - - 5.5 - IDD(on) 2 - 7.0 - Output Voltage Reference Voltage Variation Reference Voltage Accuracy VDS dVREF IOUT H Level L Level Output Leakage current SDO Output Current 1 Current Skew Output Current 2 Current Skew Output Current vs. Output Voltage Regulation Output Current vs. Supply Voltage Regulation Output Current Variation One vs. All Output ON Pull-up Resistor Pull-down Resistor Supply Current IOUT=5 ~ 90mA IOUT=5 ~ 45mA OUT0 ~ OUT15 Ta = - 40~85℃ VREF Input Voltage “OFF” “ON” Thermal Shutdown Temperature Thermal Shutdown Unit Typ. 5.0 - VDD Output Current Values Min. 4.5 3.3 - Supply Voltage Output Voltage Condition IOH IOL VIH VIL IOZ VOL VOH IOUT1 dIOUT1 IOUT2 dIOUT2 %/dVDS DC Test Circuit VDD=4.5~5.5V VDD=3.3~4.4V SDO SDO Ta = - 40~85℃ Ta = - 40~85℃ VDS = 17.0V IOL = +1.0mA IOH = -1.0mA VDS=0.6V REXT=410Ω IOL=45.0mA REXT=820Ω VDS=0.5V IOL=22.5mA VDS within 1.0V ~ 3.0V VDD within 4.5V ~ 5.5V and 3.3V ~ 4.4V VDD within 3.3 ~ 5.5V, dIOUT IOUT within 5mA ~ 60mA RIN(up) ENABLE RIN(down) LATCH %/dVDD REXT =410Ω, OUT0 ~ OUT15 =On V V mA mA TTSD 140 ℃ THYS 20 ℃ 7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 9/28/2006 REV: 0.2 Email: [email protected] 5 AT1326 Preliminary Product Information 16-bit Constant Current LED Sink Driver Switching Characteristics (Ta =+25℃, unless otherwise noted. ) Parameter Symbol tpLH1 tpLH2 tpLH3 Propagation delay tpLH tpHL1 tpHL2 tpHL3 Output Rise Time Output Fall Time Maximum CLOCK rise time Maximum CLOCK fall time Clock Frequency LATCH Pulse Width CLOCK Pulse Width ENABLE Pulse Width Set-up Time for CLOCK Terminal Hold time for CLOCK Terminal Set-up Time for LATCH Terminal Condition CLK- OUTn , LATCH =“H”, ENABLE =“L” LATCH - OUTn , ENABLE =“L” ENABLE - OUTn , LATCH =“H” CLK-SERIAL OUT CLK- OUTn , LATCH =“H”, ENABLE =“L” LATCH - OUTn , ENABLE =“L” ENABLE - OUTn , LATCH =“H” CLK-SERIAL OUT 10~90% of voltage waveform 90~10% of voltage waveform When not on PCB (Note*) tpHL tor tof tr tf fCLK Cascade connected twLAT - Values Min. Typ. Max. Unit - 80 160 - 80 160 - 50 200 20 25 - - 60 120 - 60 120 - 60 120 20 20 25 70 50 - 150 150 500 500 25 - ns ns ns ns MHz ns - - ns ns ns ns twCLK twENA tSETUP1 - 20 200 5 THOLD - 10 - - ns tSETUP2 - 25 - - ns Conditions: (Refer to test circuit.) Topr = 25°C, VDD = VIH = 3.3 V and 5 V, VOUT = 0.7 V, VIL = 0 V, REXT = 490Ω, VL = 3.0 V, RL = 60Ω, CL _ 10.5 pF Note*: If the device is connected in a cascade and tr/tf for the waveform is large, it may not be possible to achieve the timing required for data transfer. Please consider the timings carefully. 7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 9/28/2006 REV: 0.2 Email: [email protected] 6 AT1326 Preliminary Product Information 16-bit Constant Current LED Sink Driver Test Circuit IDD IOUT VIH, VIL ENABLE OUT0 CLK Function Generator RL OUT15 LATCH SDI VIH=5V VDD Logic input waveform R-EXT GND SDO CL CL Iref VL VIL=0V tr = tf = 10ns Equivalent Circuits of Inputs and Outputs ENABLE terminal LATCH terminal VDD IN IN CLK, SDI terminal VDD IN VDD SDO terminal VDD OUT 7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 9/28/2006 REV: 0.2 Email: [email protected] 7 AT1326 Preliminary Product Information 16-bit Constant Current LED Sink Driver Timing Waveforms 1. CLK, SDI, SDO twCLK CLK 50% 50% tSETUP1 SDI 50% 50% tHOLD SDO 50% tpLH/tpLH 2. CLK, SDI, LATCH, ENABLE, OUTn CLK 50% SDI tSETUP2 LATCH 50% 50% twENA twLAT 50% ENABLE 50% 50% OUTn tpHL1/LH1 tpHL2/LH2 tpHL3/LH3 3. OUTn 90% 90% OFF OUTn 10% tof 10% ON tor 7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 9/28/2006 REV: 0.2 Email: [email protected] 8 AT1326 Preliminary Product Information 16-bit Constant Current LED Sink Driver Application Circuits Constant Current The output current is set that have considered the following items 1. In all channels on, the output current accuracy between channels is less than ±3%, and between ICs is less than ±6%. 2. The output current is constant if the VDS is enough, users can refer to the figure as below. Adjusting Output Current The output current of each channel is set by an external resistor in R-EXT pin. The relationship between IOUT and Rext is shown in the following figure. The output current can be calculated from the equation: VEXT=0.620V; IOUT = (VEXT / Rext) X 30 Where Rext is the external resistor connected to R-EXT pin and VEXT is the voltage of R-EXT pin. 7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 9/28/2006 REV: 0.2 Email: [email protected] 9 AT1326 Preliminary Product Information 16-bit Constant Current LED Sink Driver 100 90 80 70 60 50 40 30 20 10 0 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 Load Supply Voltage (VLED) The AT1326 are designed to operate with the VDS of 0.6V to 0.8V with the LED forward voltage (VF) of 1.2 to 4.0V. If higher voltages are dropped across the driver, package power dissipation will increase significantly. It is recommended to use the lowest load supply voltage or to set any serials dropping voltage (VDROP) as VDS = VLED – VF –VDROP The resistors or Zener diode, or a serials string of diodes can be used in the applications as shown in the following figures. VLED VLED VLED VDROP VDROP VDROP VF VF VF VDS VDS VDS AT1326 7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 9/28/2006 REV: 0.2 Email: [email protected] 10 AT1326 Preliminary Product Information 16-bit Constant Current LED Sink Driver Package Outline (units: mm) SSOP24 7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 9/28/2006 REV: 0.2 Email: [email protected] 11 AT1326 Preliminary Product Information 16-bit Constant Current LED Sink Driver Reflow Profiles Profile Feature Average ramp-up rate (TL to TP) Sn-Pb Eutectic Assembly Large Body Small Body Pkg. thickness Pkg. thickness <2.5mm or Pkg. ≥2.5mm or Pkg. 3 volume <350mm3 volume ≥350mm 3°C/second max. Pb-Free Assembly Large Body Small Body Pkg. thickness Pkg. thickness ≥2.5mm or Pkg. ≥2.5mm or Pkg. volume ≥350mm3 volume ≥350mm3 3°C/second max. 7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 9/28/2006 REV: 0.2 Email: [email protected] 12 AT1326 Preliminary Product Information 16-bit Constant Current LED Sink Driver Preheat -Temperature Min(Tsmin) -Temperature Max (Tsmax) -Time (min to max)(ts) Tsmax to TL -Ramp-up Rate Time maintained above: -Temperature (TL) -Time (tL) Peak Temperature(TP) Time within 5°C of actual Peak Temperature (tP) Ramp-down Rate Time 25°C to Peak Temperature 100°C 150°C 60-120 seconds 150°C 200°C 60-180 seconds 3℃/second max. 183°C 60-150 seconds 217°C 60-150 seconds 225+0/-5°C 10-30 seconds 240+0/-5°C 10-30 seconds 6°C/second max. 6 minutes max. 245+0/-5°C 10-30 seconds 250+0/-5°C 20-40 seconds 3°C/second max. 8 minutes max. *All temperatures refer to topside of the package, measured on the package body surface. 7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 9/28/2006 REV: 0.2 Email: [email protected] 13