DM621

DM621 SITI | Alldatasheet

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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 DM621 Version : A.007 Issue Date : 2010/08/03 File Name : SP-DM621-A.007.doc Total Pages : 22 12-CHANNELS PRE-PROGRAMMABLE CONSTANT CURRENT LED DRIVER

12-Channels Pre-programmable Constant Current LED Driver Version:A.007 P a g e 1 未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任 Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. DM621 DM621 12-CHANNELS PRE-PROGRAMMABLE CONSTANT CURRENT LED DRIVER General Description The DM621 is an innovative LED driver that integrates a new data transmit interface to accomplish 2-wires control for lighting applications. By the combination of SIN and DCK, DM621 could be pre-programmed to se t the operating modes that involve GCK frequency division, PWM grayscale selection, inverse IOUT PWM signal, and GCK frequency selection. DM621 also provides the auto-latch function and incorporates a particular PWM method (AS-PWM). The IOU T waveform is averagely divided into 16 sections in order to reduce the flickers and enhance the visual refresh rate. The DM621 could also be constructed as a PWM controller for LED drivers. In this case, resistors must be connected at output pins to achieve this function (Fig.18). This chip incorporates 4x3-c hannel constant current circui try with current value set by 3 external resistors and 256/ 1024/4096/16384 gray scale PWM function unit. Each channel provides a maximum current of 90mA. The maximum output sustaining voltage of 28V would make more serial LEDs possibl e. And DM621 also integrates an internal regulator to make power supply voltage up to 12V. Meanwhile, retiming of DCKO and SOUT is advantageous in the LED decorating and long-cascade applications.

Features

z 4 x 3(R/G/B) Output Channels z 8/10/12/14-bits PWM grayscale Control z Maximum Clock Frequency: 20MHz z Constant Current Output: 5mA to 90mA z Maximum Output Sustaining voltage: 28V z Power Supply Voltage: 5V to 12V z Average Separated IOUT PWM Waveform z Auto-latch Function z Retiming of DCKO and SOUT for long cascade applications z Serial Shift-In Architecture for Data of Grayscale, frequency Division and PWM bit number z Incorporating internal GCK oscillator 12MHz (R efresh rate = 46.8KHz @ 8-bits PWM) z Package: TSSOP24 (with thermal pad), QFN20 (with thermal pad)

Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. Figure 1. Functional Schematic of Whole Chip The schematic of DM621 comprises of several fundamental units as shown in Figure1. SOUT in order to realize the Auto-Latch function and improve the ability of long cascade.

Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. Synchronous clock input for serial data. edges of DCK. It also could be used as GCK. and GND for driver current setting. Figure 2. The Package of QFN20 Figure 3. The Package of TSSOP24

12-Channels Pre-programmable Constant Current LED Driver Version:A.006 P a g e 4 未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任 Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. DM621 Equivalent Circuit of Inputs and Outputs 1. DCK, SIN terminals INPUT VDD GND 2. DCKO, SOUT terminals

12-Channels Pre-programmable Constant Current LED Driver Version:A.006 P a g e 5 未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任 Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. DM621 Maximum Ratings (Ta = 25°C, Tj(max) = 150°C) CHARACTERISTIC SYMBOL RATING UNIT Supply V oltage V DD 12 V Input V oltage V IN 5 V Output Current I OUT 90 mA Output V oltage V OUT 28 V DCK Frequency F DCK 20 MHz IGND Terminal Current I GND 750 mA 3.1 (QFN20: Ta=25°C) Power Dissipation P D 2.78 ( TSSOP24 exposed pad: Ta=25°C) W 40.21 (QFN20) Thermal Resistance R th(j-a) 45 (TSSOP24 exposed pad) °C/W Operating Temperature Topr 85 °C Storage Temperature T stg 150 °C Recommended Operating Condition CHARACTERISTIC SYMBOL CONDITION MIN. TYP. MAX. UNIT Supply V oltage VDD ⎯ 5 ⎯ 12 V Output V oltage VOUT ⎯ ⎯ ⎯ 28 V Operating Temperature T OPR ⎯ 25 ⎯ 85 ℃ IOUT OUT 5 ⎯ 90 mA IOH V OH =3V ⎯ 2.5 ⎯ mA Output Current IOL V OL= 0.2V ⎯ -2 ⎯ mA VIH 3 ⎯ 5 Input V oltage VIL VDD=5V~12V 0 ⎯ 1 V

12-Channels Pre-programmable Constant Current LED Driver Version:A.006 P a g e 6 未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任 Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. DM621 Electrical Characteristics (VDD = 12 V, Ta = 25°C unless otherwise noted) CHARACTERISTIC SYMBOL CONDITION MIN. TYP. MAX. UNIT Input V oltage “H” Level VIH ⎯ 3 ⎯ 5 Input V oltage “L” Level VIL ⎯ 0 ⎯ 1 V Output Leakage Current I OL VOUT = 28 V ⎯ ⎯ 1.0 uA Output Current Skew (Bit-Bit) ΔIout VOUT = 1V REXT=5 K Ω ⎯ ⎯ ±4 % Output Current Skew (Chip-Chip) ΔIout VOUT = 1V REXT=5 K Ω ⎯ ⎯ ±6 % Output V oltage Regulation I V out = 1.2V ~ 5.0V (% / V out) REXT=5 KΩ ⎯ 0.1 0.5 % / V Supply V oltage Regulation % / VREF VDD = 5V ~12V ⎯ 0.5 1 % / V Internal Oscillator Frequency fosc VDD = 5V ~12V 9.8 12.3 14.75 MHz REXT = OPEN, all outputs off ⎯ 1.9 ⎯ Supply Current “OFF” Idd (off) REXT = 2KΩ (Iout=60mA), all outputs off ⎯ 17 ⎯ Supply Current “ON” Idd (on) REXT = 2KΩ (Iout=60mA), all outputs on ⎯ 17 ⎯ mA Switching Characteristics (Ta = 25 °C unless otherwise noted) CHARACTERISTIC SYMBOL CONDITION MIN. TYP. MAX. UNIT SOUT Propagation Delay (“L” to “H”) tPLH(sout) 10 25 40 ns SOUT Propagation Delay (“H” to “L”) DCK to SOUT tPHL(sout) 5 20 35 ns DCKO Propagation Delay ( “ L ” t o “ H ” ) tPLH(DCKO) 4 8 12 ns DCKO Propagation Delay DCK to DCKO tPHL(DCKO) 5 10 15 ns Output Current Rise Time tor 18 25 32 ns Output Current Fall Time tof 8 15 22 ns DCKO to SOUT Delay Time tout 12 ⎯ ⎯ ns SIN Setup Time tsetup 3 ⎯ ⎯ ns SIN Hold Time thold 8 ⎯ ⎯ ns Command Delay Time tCMD 12 20 ⎯ ns SIN to SOUT Rise Delay Time (CMD Method) tsdr 6 9 12 ns SIN to SOUT Fall Delay Time (CMD Method) tsdf VDD=5V VIH=3V VIL=GND Rext=5KΩ VLED=5V RL=62Ω CL=8pF 5 8 11 ns

12-Channels Pre-programmable Constant Current LED Driver Version:A.006 P a g e 8 未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任 Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. DM621 Typical Performance Characteristics (refer to Figure.4)

Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. Figure 6. Serial Shift-In Luminance Data Structure This serial shift (shift register) architecture follows a FIFO (first-in first-out) format. The MSB (Most Significant Bit) data is the first data bit t h a t s h i f t i n t o t h e d r i v e r . The LSB (Least Significant Bit) data is the last bit in the data sequence. And the PWM [1:0] command determines the data rate of each channel.

12-Channels Pre-programmable Constant Current LED Driver Version:A.006 P a g e 1 1 未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任 Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. DM621 Command/Data Switching and Auto-latch Function Figure 9(a). The Command/Data Method Figure 9(b). The Auto-latch Method DM621 combines the signals of DCK and SIN to realize the Command/Data switching and Auto-latch function. W hen the area that DCK keeps at high level includes two positive edges of SIN, DM621 would switch automatically to the command data mode, illustrated in Figure 9(a). At this time, 8-bits command data could be transmitted to set the operating condition adequate for differ ent applications. After command data transmission is accomplished, a latch signal w ould have to be executed by Auto-latch function. And this chip would latch command dat a into internal registers and return to the grayscale data mode as a latch instruction is executed. The Auto-latch function is realized by this method that the area that DCK keeps at high leve l includes only one positive edge of SIN, illustrat ed in Figure 9(b). Note that the latch signal of command data and grayscale data could be completed according to the same Auto-latch process. Both Command/Data switching and Auto-latch process would produce signals to control synchronously every serial DM621s. Ther efore, each serial DM621 would enter the command mode and execute a latch instruct ion simultaneously. And DM621 also supports the internal synchronous clock for gr ayscale display. These characteristics would make great grayscale display possible. In this specific design, the smallest limitation of tCMD, the time from the positive edge of DC K to the first positive edge of SIN, is 20ns in order to promise the correct command and grayscale data could be received. Note that command data have to be transmi tted to pre-programmed DM621s when the system is restarted because there are no EEPROM in this chip to save the command data and the grayscale data.

Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. LATCH signal to control the system automatically. Figure 10. The timing diagram of command data

Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. Figure 13. Timing diagram of serial data transference

12-Channels Pre-programmable Constant Current LED Driver Version:A.006 P a g e 1 6 未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任 Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. DM621 Power Dissipation The power dissipation of a semiconductor ch ip is limited to its package and ambient temperature, in which the device requires the maximum output current calculated for given operating conditions. The maximum allowable power consumption can be calculated by the following equation: Pd(max)(Watt) = Tj(junction temperature)(max)(°C)– Ta(ambient temperature)(°C) Rth(junction-to-air thermal resistance)(°C/Watt) The relationship between power dissipation and operating temper ature can refer to the figure below: 0.5 1.5 2.5 3.5 0 20 40 60 80 100 120 140 160 Ambient Temperature Ta(℃) Power Dissipation Pd(W) Based on the Pd (max), the maximum allowable vo ltage of output terminal can be determined by the following equation: Pd(max)(W)– VCC(V) × IDD(A)VoutR × IoutR × DutyR + VoutG × IoutG × DutyG + VoutB × IoutB × DutyB < Tj(max)=150 °C Rth(QFN20)=40.21 °C/Watt Rth(TSSOP24)=45 °C/Watt QFN20 TSSOP24

12-Channels Pre-programmable Constant Current LED Driver Version:A.006 P a g e 1 7 未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任 Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. DM621 Application Diagram (1) DCK global connection (Figure 16): (2) DCK serial connection (Figure 17): Just connected as the architecture illust rated above, DM621 could automatically produce the global latch and make serial data po ssible. The system just needs four lines (VDD, VSS, SIN, and DCK) to realize the casc ade architecture. Please utilize a slower DCK frequency and increase tCMD to realize a long cascade. (3) PWM generator (Figure 18): DM621 could be utilized as a PWM generator. In this case, DM621 will output inverse PWM signals by the POLAR command.

12-Channels Pre-programmable Constant Current LED Driver Version:A.006 P a g e 1 8 未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任 Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. DM621 (4) Demo board (TSSOP24 PCB available): Top View Bottom View Photo The length of DCK should be equal to that of SIN as close as possible. Similarly, DCKO and SOUT should obey this rule in order to avoid the error of timing in long-cascade applications.

12-Channels Pre-programmable Constant Current LED Driver Version:A.006 P a g e 1 9 未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任 Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. DM621 Package Outline Dimension DM621-TSSOP24 SYMBOL DIMENSION IN MM DIMENSION IN INCH A1 0.000 - 0.150 0.000 - 0.059 b 0.190 - 0.300 0.074 - 0.118 E 6.400 BSC 2.520 BSC e 0.650 BSC 0.256 BSC L1 1.000 REF 0.394 REF θ° 0 - 8 0 - 8 PAD SIZE2 (112×18E) E2 2.280 - 2.850 0.897 - 1.122 D1 3.700 - 4.620 1.456 - 1.819

12-Channels Pre-programmable Constant Current LED Driver Version:A.006 P a g e 2 0 未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任 Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. DM621 Package Outline Dimension DM621-QFN20 SYMBOL DIMENSION IN MM DIMENSION IN INCH A3 0.203 REF 0.080 REF e 0.500 BSC 0.197 BSC

12-Channels Pre-programmable Constant Current LED Driver Version:A.006 P a g e 2 1 未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任 Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. DM621 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 menti oned 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 distribut ors 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. Silicon Touch Technology, Inc. reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete.