DM133 Version : A.024 Issue Date : 2004/07/05 File Name : SP-DM133-A.024.doc Total Pages : 20 16-Bit Constant Current LED Drivers With LED Open/Short Detection 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 DM133 SILICON TOUCH TECHNOLOGY INC. DM133 16-Bit Constant Current LED Drivers with LED Open/Short Detection General Description The DM133 is a constant current driver specifically designed for LED display applications. The device includes a 16-bit shift register, two latches, and constant current drivers on a single Silicon CMOS chip. Its built-in open/short detection and thermal alarm circuits help the user to detect the overheating of the IC and LED failures. Its user-friendly design allows the user to adjust the output current (5~60mA) by using an external resistor. The current also can be further tuned by 6-bit serial shift-in data. Features Constant Current Output: Current with one resistor for 5mA to 60mA Maximum Clock Frequency: 25MHz (Max.) Power Supply Voltage: 3.3V to 5.0V CMOS Compatible Input/Output Package: HSOP28, SSOP28, QFN32 Constant Current Matching: 10mA ~ 60mA : Bit-to-Bit : ± 4.0% (Max)、 5mA ~ 10mA : Chip-to-Chip: ± 10.0% (Max) Bit-to-Bit : ± 6.0% (Max)、 Chip-to-Chip: ± 12.0% (Max) 17V Error signal output when junction temperature exceeds limit Maximum Output Voltage: Thermal Alarm Function: LED Open/Short Detection: Error signal output when LED is failed 6 bit Linear Global Current Adjustment 16-Bit Constant Current LED Drivers -1- Version：A.024 點晶科技股份有限公司 DM133 SILICON TOUCH TECHNOLOGY INC. Pin Connection (Top view) SSOP28 VDD ENABLE LATCH CLOCK SERIAL_IN DATASEL OUT0 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 HSOP28 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 VDD ENABLE LATCH CLOCK SERIAL_IN DATASEL OUT0 GND RESERVED REXT SOMODE ALARM SERIAL_OUT OUT15 OUT14 OUT13 OUT12 OUT11 OUT10 OUT9 OUT8 GND OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 1 2 3 4 5 6 7 28 27 26 25 24 23 22 GND RESERVED REXT SOMODE ALARM SERIAL_OUT OUT15 Thermal Pad GND 8 9 10 11 12 13 14 OUT14 OUT13 OUT12 OUT11 OUT10 OUT9 OUT8 21 20 19 18 17 16 15 QFN32 OUT9 OUT8 OUT7 OUT6 21 20 19 OUT13 OUT4 OUT10 22 OUT5 OUT11 24 25 23 OUT12 18 17 16 OUT3 26 15 OUT2 OUT14 27 14 OUT1 OUT15 28 13 OUT0 SERIAL_OUT 29 12 DATASEL ALARM 30 11 SERIAL_IN SOMODE 31 10 CLOCK REXT 32 9 LATCH Thermal Pad GND 4 5 GND GND RESERVED GND VDD 16-Bit Constant Current LED Drivers 6 7 8 GND 3 GND 2 ENABLE 1 -2- Version：A.024 點晶科技股份有限公司 DM133 SILICON TOUCH TECHNOLOGY INC. Block Diagram OUT0 ALARM Thermal Alarm OUT15 LED Open Detection 16 bits Constant Current Driver Global Current Controller 16 bits Latch 6 bits Latch Voltage Reference REXT ENABLE 6bit data Channel Selector 10bit data LATCH 6bit data DATASEL SERIAL_IN Channel Selector 10 bits Shift Register 6 bits Shift Register Serial_out Selector CLOCK SERIAL_OUT SOMODE Pin Description SDIP No. PIN NAME FUNCTION 1 VDD Supply voltage terminal. 2 ENABLE Input terminal of output enable (active low), all outputs are off when ENABLE is high. 3 LATCH Input terminal of data strobe. Data is latched when LATCH is low. And data on shift register goes through when LATCH is high. 4 CLOCK Input terminal of a clock for shift register. Data is sampled at the rising edge of CLOCK. 5 SERIAL_IN Input terminal of a data shift register. 6 DATASEL Input terminal of a data path selection for output current on/off or global current adjustment 7~22 OUT0~15 Output terminals with constant current. 23 SERIAL-OUT Output terminal of a data shift register. 24 ALARM Output open drain terminal for an alarm function. It will go low as LED open/short or chip overheated. 25 SOMODE Input terminal of a data output trigger mode selection 26 REXT Input terminal of an external resistor. The current flows through the resistor from REXT to ground will be the reference base current of output sink current. 27 RESERVED Terminal for testing, user should leave this pin open. 28 GND Ground terminal 16-Bit Constant Current LED Drivers -3- Version：A.024 點晶科技股份有限公司 DM133 SILICON TOUCH TECHNOLOGY INC. Equivalent Circuit of Inputs and Outputs 1. ENABLE, DATASEL terminals 2. LATCH, SOMODE terminals VDD VDD RIN(up) INPUT INPUT RIN(down) GND GND 3. CLOCK, SERIAL-IN terminals 4. SERIAL-OUT terminal VDD VDD INPUT SERIAL_OUT GND GND 5. ALARM terminal VDD ALARM GND 16-Bit Constant Current LED Drivers -4- Version：A.024 點晶科技股份有限公司 DM133 SILICON TOUCH TECHNOLOGY INC. Maximum Ratings (Tj(max) = 150°°C) CHARACTERISTIC Supply Voltage Input Voltage SYMBOL RATING UNIT VDD -0.3 ~ 7.0 V VIN -0.3 ~ VDD+0.3 V Output Current IOUT 70 mA Output Voltage VOUT -0.3 ~ 17 V Clock Frequency fCLK 25 MHz GND Terminal Current IGND Power Dissipation (4 layer PCB) Thermal Resistance 1120 mA 2.11 (HSOP-28 : Ta=25°C) W 1.1 (SSOP-28: Ta=25°C) W 3.18 (QFN-32 : Ta=25°C) W PD Rth(j-a) 59.1 (HSOP-28) °C/W 113.3 (SSOP-28) °C/W 39.3 (QFN-32) °C/W Operating Temperature Topr -40 ~ 85 °C Storage Temperature Tstg -55 ~ 150 °C Recommended Operating Condition CHARACTERISTIC SYMBOL CONDITION MIN. TYP. MAX. Supply Voltage VDD 3.0 5.0 5.5 V Output Voltage VOUT 17 V IO OUTn 5 60 IOH SERIAL-OUT 1.0 IOL SERIAL-OUT -1.0 VIH 0.8VDD VDD VIL 0.0 0.2VDD Output Current Input Voltage UNIT mA V LATCH Pulse Width tw LAT 15 ns CLOCK Pulse Width tw CLK 15 ns Set-up Time for DATA tsetup(D) 10 ns Hold Time for DATA thold(D) 10 ns Set-up Time for LATCH tsetup(L) 15 ns Single Chip operation 25 Cascade operation (SOMODE=’L’) CL=13pF 25 Cascade operation (SOMODE=‘H’) CL=13pF 15 Clock Frequency fCLK VDD = 3.3 ~ 5.0 V 16-Bit Constant Current LED Drivers -5- MHz Version：A.024 點晶科技股份有限公司 DM133 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 ±4 % 10.2 11.4 12.6 mA ±0.1 ±0.5 %/V ±2.0 ±4.0 %/V 1.0 LSB Output Voltage (S - OUT) Output Current (Bit-Bit) 1 Output Current 2 (Chip-Chip) IOL1 IOL2 Output Voltage Regulation % / VOUT VOUT = 0.4V, Rrext = 4.8KΩ VDD=3.3V, (1 channel on) VOUT = 0.4V, Rrext = 4.8KΩ VDD=3.3V, (1 channel on) Rrext = 4.8KΩ, VOUT = 1V to 3V Supply Voltage Regulation % / VDD Rrext = 4.8KΩ Differential Linearity DLE Thermal Alarm Detection Temperature T(tsd) LED Open Detection Voltage V(od) Pull-Up Resistor Pull-Down Resistor Junction temperature V uA V 140 150 160 ℃ 0.3 V RIN(up) 150 300 600 KΩ RIN(down) 100 200 400 KΩ 8 8.5 11 13 16 IDD(off)1 Supply Current “OFF” -1.0 UNIT IDD(0ff)2 IDD(off)3 IDD(on)1 Supply Current “ON” IDD(on)2 Input Signal is static, Rrext = OPEN, OUT0~15 = off Input Signal is static, Rrext = 2.8KΩ, OUT0~15 = off Input Signal is static, Rrext = 1.4KΩ, OUT0~15 = off Input Signal is static, Rrext = 2.8KΩ, OUT0~15 = on Input Signal is static, Rrext = 1.4KΩ, OUT0~15 = on mA 1 Bit-Bit skew of the IC is defined as the ratio between (any Iout – average Iout) and average Iout, where average Iout = (Imax + Imin) / 2. 2 Chip-Chip skew is defined the range into which any output current of any IC falls”. 16-Bit Constant Current LED Drivers -6- Version：A.024 點晶科技股份有限公司 DM133 SILICON TOUCH TECHNOLOGY INC. Switching Characteristics (Ta = 25 °C unless otherwise noted) CHARACTERISTIC SYMBOL VDD=5.0V Propagation ENABLE-OUTn Delay Time tpLH (“L” to “H”) OUTn-Alarm(on) Propagation CONDITION Rrext=2.4KΩ Delay Time tpHL VL=3.3V RL=120Ω (“H” to “L”) OUTn-Alarm(off) TYP. MAX. UNIT 40 ns 70 ns 130 ns 100 ns 50 ns 25 ns MIN. TYP. MAX. UNIT 50 ns 70 ns 160 ns 100 ns 60 ns 25 ns VIH=VDD VIL=GND ENABLE-OUTn MIN. CL=13pF Output Current Rise Time tor Output Current Fall Time tof CHARACTERISTIC Ralarm=500Ω SYMBOL Propagation ENABLE-OUTn Delay Time VDD=3.3V tpLH (“L” to “H”) OUTn-Alarm(on) Propagation CONDITION VIH=VDD VIL=GND Rrext=2.4KΩ ENABLE-OUTn Delay Time tpHL VL=3.3V RL=120Ω (“H” to “L”) OUTn-Alarm(off) CL=13pF Output Current Rise Time tor Output Current Fall Time tof Ralarm=500Ω VDD Ralarm VL 500 VDD Alarm 120 RL 13pF CL OUTn REXT Rrext 2.4K 16-Bit Constant Current LED Drivers GND -7- Version：A.024 點晶科技股份有限公司 DM133 SILICON TOUCH TECHNOLOGY INC. Timing Diagram 1. CLOCK-SERIAL-IN, SERIAL-OUT, OUTn tr tf twCLK CLOCK SERIAL-IN 90% 50% 10% tsetup 90% 50% 10% twCLK 50% 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 16-Bit Constant Current LED Drivers -8- Version：A.024 點晶科技股份有限公司 DM133 SILICON TOUCH TECHNOLOGY INC. Detailed Description 1) Constant Current Output Value Setting The output current is determined by resistor value multiplying a ratio. The resistor connected between REXT pin and GND decides the base current output. The resistor should be located as close to REXT terminal as possible to avoid the noise influence. The graph below shows the approximate relation between resistor value and output current value. In the monochrome or full color LED display cases, for obtaining the uniformity or for the white balance between modules or ICs, the DM133 offers a more convenient way to let control system to reach the goal by fine tuning the output current. To further adjust the current level, the system shall set the DATASEL pin to low and then shift in 6 bits data code through SERIAL_IN pin. The MSB should be shifted-in first. Take the input code = (MSB)100101(LSB) for example. The new current is then equal to the base 5 2 0 5 4 3 2 1 0 current multiplied by (2 + 2 + 2 ) (2 + 2 + 2 + 2 + 2 + 2 + 1 ) . The 6 bits data won’t be changed until the next new data is latched. For some cases, the data only need to be shifted once after power-on. Note that code: 011111 exists in chip when power on so that the output current is nearly half amount of the base current. 60.00 Conditions: 55.00 Vout=1.5V, Vrext=1.2V. 50.00 1 channel turned on. 45.00 Iout is approximate to Vrext/Rrext*49.5 (5V) Vrext/Rrext*46.6 (3.3V) Iout (mA) 40.00 35.00 30.00 25.00 VDD=5.0V 20.00 15.00 VDD=3.3V 10.00 5.00 0.00 0 2 4 6 8 10 12 14 16 Rext (Kohm) 2) Serial_In Data and Latch As the DATASEL pin is set high, the SERIAL_IN data will be clocked into the 16 bits shift register synchronized on the rising edge of CLOCK. 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 LATCH pin goes high. And the data will be latched when LATCH goes low. 16-Bit Constant Current LED Drivers -9- Version：A.024 點晶科技股份有限公司 DM133 SILICON TOUCH TECHNOLOGY INC. 3) Serial_Out Timing Selection The SERIAL_OUT output timing can be changed by the level of SOMODE. When SOMODE is set high, data is shifted out on synchronization to the falling edge of CLOCK, and when SOMODE is set low, data is clocked out to SERIAL_OUT synchronized on the rising edge of CLOCK. The graph below depicts the timing of data serial-in and serial-out. 16 Clocks CLOCK 5V 0V SERIAL_IN 5V 0V LATCH 5V 0V ENABLE 5V 0V DATASEL 5V 0V SOMODE 5V 0V SERIAL_OUT 5V 0V Previous Data OUT0 ON OFF OUT1 ON OFF OUT2 ON OFF OUT3 ON OFF OUT13 ON OFF OUT14 ON OFF OUT15 ON OFF 4) Thermal Alarm The open-drain ALARM pin will go low when the IC junction temperature is approximately above 150℃. As the thermal alarm is issued, the system should cool down the temperature (by lowering the PWM current output, or by turning on the fan system, …etc.). The ALARM pin will return to high when the IC junction temperature is approximately below 100℃ or when the power is turned on again after turned off for several seconds. Operation in a thermal alarm situation for long time may cause permanent damage to the IC. 16-Bit Constant Current LED Drivers -10- Version：A.024 點晶科技股份有限公司 DM133 SILICON TOUCH TECHNOLOGY INC. 5) LED Open Detection The DM133 monitors the whole system, but its alarm mechanism won’t burden the control system until some fault happens. The ALARM pin is used for both signaling the thermal alarm and LED disconnection. When ALARM is low, either overheating or LED disconnection occurs. And when ALARM returns to high, either the LED is re-connected or the temperature is lowered down. Therefore, ENABLE is used to tell which situation occurs when ALARM goes low. Assume ENABLE is low and ALARM is low now. By turning ENABLE high, all the current outputs are off and hence, LED open detection is disabled. Then, if ALARM is changed to high, LED disconnection must have occurred. On the other hand, if the ALARM remains low, then, the IC is obviously overheated. The constant current output can be turned on sequentially to identify which output’s LED is disconnected. Table 1 shows the detectimg operation and the corresponding occurance. ENABLE ALARM OCCURANCE LowHigh LED Disconnection LowLow Thermal Alarm LowHigh LED Number LED Status OUTn Detection Result ALARM LED Number LED Status OUTn Detection Result ALARM LED Number LED Status OUTn Detection Result ALARM 1 Good On Good 1 Good On Good 1 Good Off Good 2 3 Not-Good Good On On Not-Good Good Low (case 2, 4) 2 3 Not-Good Good On Off Not-Good Good Low (case 2) 2 3 Not-Good Good Off Off Good Good High 4 Not-Good On Not-Good 4 Not-Good Off Good 4 Not-Good Off Good Table 1. ALARM pin Output Example The open-drain ALARM pin will go low when the current output pins are turned on and below 0.3V. Hence, to prevent the ALARM from going low when LED is in the normal condition, the supply voltage for LED should be set so that the driver output voltage goes above 0.4V. Note that it takes 0.2us for the detection function to work ( Ralarm=500Ω ). 16-Bit Constant Current LED Drivers -11- Version：A.024 點晶科技股份有限公司 DM133 SILICON TOUCH TECHNOLOGY INC. There’s a simple procedure to implement the sequence of open detection for a specified LED module. SW1 SW2 open Controller SW3 SW4 DM133 Alarm DM133 Alarm R Example: Take the 4x32 LED module as an example. Once the controller received the alarm signal, then 1. Set ENABLE=H, check that the Valarm remains ‘H’ or ‘L’ to see if any IC is in thermal alarm mode. 2. Set DATASEL=H and Shift 32 clocks of ‘1’ into the ICs to turn on all 32 outputs, then set LATCH=H ,ENABLE=L. 3. Turn on the SW1 and watch the alarm line to see whether its voltage level is from ‘H’ to ‘L’ or not. Scan all the lines to identify which row has problem. 4. Once any row has problem. 5. Shift 32 clocks of ‘0’ into the ICs to turn off all 32 outputs. 6. Shift an ‘1’ and follow the other 31 ‘0’s to the LED module clock-by-clock, then the controller can watch the alarm line to see whether its voltage level is from ‘H’ to ‘L’ or not. Then the opened LED will be identified. 7. Switch to the next problem row and repeat the step 6. Follow the above steps, we recognize which LED fails as the controller receives an ‘0’ at 17th clock on the second scan line. Then we can identify the opened LED on the LED module. The procedure described above is easy for implementation, the control system doesn’t need an extra memory to handle the patterns comparison or to switch modes back and forth. 16-Bit Constant Current LED Drivers -12- Version：A.024 點晶科技股份有限公司 DM133 SILICON TOUCH TECHNOLOGY INC. LED Short Detection V LED + D em u ltip lex er V sw_ SWnormal/open SWshort1 SWshort2 SWshort3 R short1 IL E D 1 D M 133 D M 133 A larm A larm R short2 Controller IL E D 2 D M 133 D M 133 A larm A larm R short3 IL E D 3 D M 133 D M 133 A larm A larm Example: Consider the following conditions: LED’s (R, G, B) Vf variations are between 1.7V to 4.0V (R:1.7~2.4V, G/B: 3.0~4.0V), VLED=5V, ILED =20mA (R), 15mA (G) and 10mA (B). In order to detect the short LED, we need to add four components in the LED drive system: a demultiplexer (SW normal/open, Swshort) and three Rshorts . And assume the Vsw is 0.1V in all current condition. The algorithm for detecting the short LED is based on the forward voltage of the LED in different conditions (normal/short/open circuit). First, we need to decide the value of Rshort. Two inequalities are follows: VLED－Vsw－ILED×Rshort－Vf ﹤0.3V (LED is OK or Open) (1) VLED－Vsw－ILED×Rshort (LED is Short) (2) ＞0.4V Let’s take the B LED as an example. From (1), Rshort ＞160Ω (Vf=3.0V) and Rshort ＞ 60Ω (Vf=4.0V). Then we choose Rshort ＞160Ω. From (2), we can calculate the Rshort ﹤ 450Ω. Finally, we take a proper Rshort ＝ (160+450)/2 ＝ 305Ω. Follow the same steps, we can get 203Ω for G LED. Note: as ILED is larger than 15mA (ex. ILED =20mA (R)), we still put the 15mA in the above two equations. Then we’ll get the 247Ω for R LED. Turn on the SW short switches one after one. Then follow the LED open detection procedure; turn on only one LED in the scan process. The Valarm will be “L” as LED is normal or open. Once the LED is short, The Valarm will be changed to “H”. 16-Bit Constant Current LED Drivers -13- Version：A.024 R 點晶科技股份有限公司 DM133 SILICON TOUCH TECHNOLOGY INC. 6) Data Transfer Timing Chart We assume that the chip’s output current level will be programmed first in order to set the whole panel global brightness or to set the white balance after power-on sequence and then the image data will follow. For example, in the following graph, the data for global current is set to ‘100101’, and the image data is set to ‘1010101010101010’. At first, we should set the DATASEL low and then send the current data to SERIAL_IN pin. After 6 clock pulses pass, the data will be latched by sending a high latch pulse. Then tune the DATASEL to high and send the image data. The data will be transfered into the shift register after 16 clock pulses and latched. If the global current level will still stay the same, then the user only need to shift the current data once. The data latched will be kept until the next new data shifts in. 5V 0V 5V 0V 5V 0V 5V 0V DATASEL SERIAL_IN CLOCK LATCH Data for global current Data for image 5V 0V 5V 0V 5V 0V 5V 0V DATASEL SERIAL_IN CLOCK LATCH 7) Thermal Pad The IC’s thermal pad 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 heat dissipation. 16-Bit Constant Current LED Drivers -14- Version：A.024 點晶科技股份有限公司 DM133 SILICON TOUCH TECHNOLOGY INC. 8) Output Current Performance vs. Output Voltage 60.000 60.000 VDD=5.0V VDD=3.3V 50.000 40.000 40.000 Iout (mA) Iout (mA) 50.000 30.000 30.000 20.000 20.000 10.000 10.000 0.000 0.000 0 1 2 3 4 5 0 1 2 Vout (V) 3 4 5 Vout (V) 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. 9) Power Dissipation Pd - Ta 3.50 3.00 QFN Pd (W) 2.50 2.00 HSOP 1.50 1.00 SSOP 0.50 0.00 0 20 40 60 80 100 120 140 160 Ta Note As the power dissipation of a semiconductor chip is limited by its package and ambient temperature, this device requires a maximum output current given by an 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 ) 16-Bit Constant Current LED Drivers -15- Version：A.024 點晶科技股份有限公司 DM133 SILICON TOUCH TECHNOLOGY INC. Package Outline HSOP28 16-Bit Constant Current LED Drivers -16- Version：A.024 點晶科技股份有限公司 DM133 SILICON TOUCH TECHNOLOGY INC. Package Outline SSOP28 D h x 45 E E1 DETAIL A C ZD θ2 0.25 MM A C e B A1 GAUGE PLANE 0.1MM θ1 DETAIL A R1 R L SEATING PLANE NOTES: DIMENSION D DOES NOT INCLUDE MODE PROTRUSIONS OR GATE BURRS. MOLD PROTRUSIONS AND GATE BURRS SHALL NOT EXCEED 0.006 INCH PER SIDE SYMBOL A A1 A2 B C e D E E1 L h ZD R1 R θ θ1 θ2 JEDEC DIMENSION IN MM DIMENSION IN INCH MIN. NOM. MAX. MIN. NOM. MAX. 1.35 1.63 1.75 0.053 0.064 0.069 0.1 0.15 0.25 0.004 0.006 0.01 1.5 0.059 0.2 0.3 0.008 0.012 0.18 0.25 0.007 0.01 0.635 BASIC 0.025 BASIC 9.80 9.91 10.01 0.386 0.39 0.394 5.79 5.99 6.20 0.228 0.236 0.244 3.81 3.91 3.99 0.150 0.154 0.157 0.41 0.635 1.27 0.016 0.025 0.05 0.25 0.5 0.01 0.02 0.838 REF 0.033 REF 0.2 0.33 0.008 0.013 0.2 0.008 0 8 0 8 0 0 5 10 15 5 10 15 MO - 137 (AF) 16-Bit Constant Current LED Drivers -17- Version：A.024 θ 點晶科技股份有限公司 DM133 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 16-Bit Constant Current LED Drivers -18- Version：A.024 點晶科技股份有限公司 DM133 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. 16-Bit Constant Current LED Drivers -19- Version：A.024