DM634 Version : A.003 Issue Date : 2009/03/11 File Name : SP-DM634-A.003.doc Total Pages : 25 16-CHANNEL CONSTANT CURRENT LED DRIVER WITH PROGRAMMABLE PWM OUTPUTS 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 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 DM634 16-CHANNEL CONSTANT CURRENT LED DRIVER WITH PROGRAMMABLE PWM OUTPUTS General Description DM634 is a 16-channel constant current sink LED driver. Each channel has adjustable 16-bits (65536 steps) grayscale PWM control current outputs. 7-bit global brightness control is included in supporting user to adjust chip current easily. It incorporates shift registers, data latches, constant current circuitry with current value set by an external resistor, selectable oscillator source for PWM functioning, and built-in LED open/short detection circuit to detect error status. It supports thermal alarm and shutdown function; system retrieve the message to indicate when junction temperature over limitation of chip. It is specifically designed for LED display and lighting applications. Features z Constant-current outputs: 5mA to 90mA z 16-bit linear PWM control current output per channel z 7-bit high accuracy global brightness control z Maximum output voltage: 17V z Maximum clock frequency: 25MHz z Selectable internal/external PWM reference clock z PWM free-running capability (refresh rate ~ 275 Hz with internal oscillator ~ 18 MHz) z Build-in real-time LED open/short detection z Thermal Alarm and Shotdown – Alarm : Junction Temperature >110℃ Shutdown : Junction Temperature > 180℃ z Package and pin assignment (except QFN32) compatible to conventional LED driver series (ST2221C, DM134B/5B, DM13C) z Power supply voltage: 3.3V to 5.5 V Applications z Indoor/Outdoor LED Video Display z LED Variable Message Signs (VMS) System z LED Decorative Lighting Package Types z SOP24, SSOP24, TSSOP24E (with exposed pad) 16-channel 16-bit PWM Constant Current LED Driver Version : A.003 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. Page 1 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 Block Diagram OUT 0 OUT 1 OUT 15 LED Open/Short Detector (0) LED Open/Short Detector (1) LED Open/Short Detector (15) 7-bit High Accuracy Global Brightness Control Constant Current Driver (0) Constant Current Driver (1) Constant Current Driver (15) REXT 16-bit Counter 16-bit PWM Generator (0) 16-bit PWM Generator (1) 16-bit PWM Generator (15) SOMODE/ GCK VCC GND 16 LAT 16-bit Latch Register (0) 16 16-bit Latch Register (1) 16 DAI 16 16-bit Latch Register (15) 16 16 16-bit Shift Register 16-bit Shift Register 16-bit Shift Register (0) (1) (15) DAO DCK 16-channel 16-bit PWM Constant Current LED Driver Version : A.003 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. Page 2 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 Pin Connection GND DAI DCK LAT OUT0 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 1 24 2 23 3 22 4 SOP24 5 21 20 6 SSOP24 19 7 TSSOP24E 18 8 17 9 16 10 15 11 12 14 ( top view ) 13 VCC REXT DAO SOMODE/GCK OUT 15 OUT 14 OUT 13 OUT 12 OUT 11 OUT 10 OUT 9 OUT 8 Pin Description PIN No. PIN NAME FUNCTION SOP24/SSOP24/TSSOP24E: 1 TSSOP24E: exposed pad GND Ground terminal. SOP24/SSOP24/TSSOP24E: 2 DAI Serial data input terminal. SOP24/SSOP24/TSSOP24E: 3 DCK Synchronous clock input terminal for serial data transfer. Data is sampled at the rising edge of DCK. LAT Input terminal of data strobe: ‘H’ means data on shift register goes through latch (level trigger), ‘L’ means data is latched. SOP24/SSOP24/TSSOP24E: 4 SOP24/SSOP24/TSSOP24E: 5~20 OUT0~15 Sink constant-current outputs (open-drain). SOP24/SSOP24/TSSOP24E: 21 Serial Out Mode Selection(SOMODE) : ‘H’: DAO is shifted out and synchronized to falling edge of DCK, SOMODE ‘L’ : DAO is shifted out and synchronized to /GCK rising edge of DCK. Gray Scale Clock(GCK) : Input terminal for PWM operation. SOP24/SSOP24/TSSOP24E: 22 DAO Serial data output terminal. SOP24/SSOP24/TSSOP24E: 23 REXT External resistors connected between REXT and GND for output current value setting. SOP24/SSOP24/TSSOP24E: 24 VCC Supply voltage terminal. 16-channel 16-bit PWM Constant Current LED Driver Version : A.003 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. Page 3 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 Equivalent Circuit of Inputs and Outputs 1. DCK, DAI, LAT , SOMODE/GCK terminals 2. DAO terminals PCB Layout Consideration To connect an external resistor to REXT pin and ground can determine the maximum output current. If there is any disturbance occurred to REXT pin, the constant current output may be unstable or noisy. Since REXT (pin23), DAO (pin22), and SOMODE/GCK (pin21) are next to each other, the most possible interference is caused by DAO or SOMODE/GCK signal. Accordingly, it is recommended that adding some shielding area within the above pins in PCB layout, or laying the signal line of above pins on different PCB layer will prevent the noise problems effectively. 16-channel 16-bit PWM Constant Current LED Driver Version : A.003 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. Page 4 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 Maximum Ratings (Ta=25°C, Tj(max) = 150°C) CHARACTERISTIC SYMBOL RATING UNIT Supply Voltage VCC -0.3 ~ 7.0 V Input Voltage VIN -0.3 ~ VCC+0.3 V Output Current IOUT 100 mA Output Voltage VOUT -0.3 ~ 17 V Input Clock Frequency FDCK 25 MHz GND Terminal Current IGND 1600 mA 4.31(TSSOP24E exposed pad) Power Dissipation (4 layer PCB, Ta=25°C) W 2.5(SOP24) PD 1.81(SSOP24 ) 29 ( TSSOP24E exposed pad) Thermal Resistance (4 layer PCB, Ta=25°C) Rth(j-a) Operating Temperature Top -40 ~ 85 °C Storage Temperature Tstg -55 ~ 150 °C °C/W 50 (SOP24) 69 (SSOP24 ) Recommended Operating Condition CHARACTERISTIC Supply Voltage Output Voltage SYMBOL CONDITION MIN. TYP. MAX. UNIT VCC ⎯ 3.3 5.0 5.5 V 1.0 ⎯ 0.5VCC ⎯ ⎯ 17 VOUT Output Voltage VOUT Output Current Driver On *2 Driver Off IO OUTn 5 ⎯ 90 IOH VOH = VCC – 0.4 V -0.8 ⎯ -2 IOL VOL = 0.2 V +0.8 ⎯ +2 VIH Input Voltage *1 VIL VCC = 3.3 V ~ 5.5V ⎯ VCC 0.0 ⎯ 0.2VCC FDCK Single Chip Operation ⎯ ⎯ 25 Input PWM Frequency FGCK VCC= 3.3V ~ 5.5V ⎯ ⎯ 25 tw LAT 15 ⎯ ⎯ tw DCK 15 ⎯ ⎯ 10 ⎯ ⎯ 10 ⎯ ⎯ Pulse Width DCK Pulse Width Set-up Time for DAI tsetup(D) Hold Time for DAI thold(D) Set-up Time for LAT tsetup(L) 10 ⎯ ⎯ Hold Time for LAT thold(L) 10 ⎯ ⎯ FOSC 14.4 18 22 Internal Oscillator Frequency *1 *2 VCC = 5.0V mA 0.8VCC Input Clock Frequency V V MHz ns MHz Notice that the power dissipation is limited to its package and ambient temperature. The driver output voltage including any overshoot stress has to be compliant with the maximum voltage (17V). 16-channel 16-bit PWM Constant Current LED Driver Version : A.003 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. Page 5 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 Electrical Characteristics (VCC = 5.0 V, Ta = 25°C, GBC = 95 unless otherwise noted) CHARACTERISTIC Output Leakage Current SYMBOL CONDITION MIN. TYP. MAX. UNIT IOL VOH = 17 V ⎯ ⎯ ±1.0 uA VOL IOL = 1.5 mA ⎯ ⎯ 0.4 VOH IOH= -1.3mA 4.5 ⎯ ⎯ ⎯ ⎯ ±3 % 18.275 ⎯ 20.607 mA Rrext = 2.2 KΩ VOUT = 1 V ~ 3 V ⎯ ±0.1 ±0.5 % / VCC Rrext = 2.2 KΩ ⎯ ±1 ±4 IDD(off) power on all pins are open unless VCC and GND (free-running mode) ⎯ 5.41 6.5 IDD(off) power on all pins are open unless VCC and GND (external GCK mode) ⎯ 4.61 ⎯ IDD(off) input signal is static Rrext = 12.4 KΩ all outputs turn off ⎯ 5.97 ⎯ IDD(off) input signal is static Rrext = 2.2 KΩ all outputs turn off ⎯ 8.27 ⎯ IDD(off) input signal is static Rrext = 570 Ω all outputs turn off ⎯ 17.61 ⎯ Output Voltage (S-OUT) Output Current Skew (Channel-to-Channel) *1 Output Current Skew (Chip-to-Chip) *2 Output Voltage Regulation Supply Voltage Regulation Supply Current IOL1 V VOUT = 1.0 V Rrext = 2.2 KΩ IOL2 % / VOUT *3 %/V mA mA *1 Channel-to-channel skew is defined as the ratio between (any Iout – average Iout) and average Iout, where average Iout = (Imax + Imin) / 2. *2 Chip-to-Chip skew is defined as the range into which any output current of any IC falls. *3 IO excluded. 16-channel 16-bit PWM Constant Current LED Driver Version : A.003 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. Page 6 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 Electrical Characteristics (VCC = 3.3 V, Ta = 25°C, GBC = 95 unless otherwise noted) CHARACTERISTIC Output Leakage Current SYMBOL CONDITION MIN. TYP. MAX. UNIT IOL VOH = 17 V ⎯ ⎯ ±1.0 uA VOL IOL = 1.5 mA ⎯ ⎯ 0.4 VOH IOH= -1.3 mA 2.8 ⎯ ⎯ ⎯ ⎯ ±3 % 18.275 ⎯ 20.607 mA Rrext = 2.2 KΩ VOUT = 1 V ~ 3 V ⎯ ±0.1 ±0.5 % / VCC Rrext = 2.2 KΩ ⎯ ±1 ±4 IDD(off) power on all pins are open unless VCC and GND (free-running mode) ⎯ 4.19 ⎯ IDD(off) power on all pins are open unless VCC and GND (external GCK mode) ⎯ 3.79 ⎯ IDD(off) input signal is static Rrext = 12.4 KΩ all outputs turn off ⎯ 4.75 ⎯ IDD(off) input signal is static Rrext = 2.2 KΩ all outputs turn off ⎯ 7.04 ⎯ IDD(off) input signal is static Rrext = 570 Ω all outputs turn off ⎯ 16.014 ⎯ Output Voltage (S-OUT) Output Current Skew (Channel-to-Channel) *1 Output Current Skew (Chip-to-Chip) *2 Output Voltage Regulation Supply Voltage Regulation Supply Current IOL1 V VOUT = 1.0 V Rrext = 2.2 KΩ IOL2 % / VOUT *3 %/V mA *1 Channel-to-channel skew is defined as the ratio between (any Iout – average Iout) and average Iout, where average Iout = (Imax + Imin) / 2. *2 Chip-to-Chip skew is defined as the range into which any output current of any IC falls. *3 IO excluded. 16-channel 16-bit PWM Constant Current LED Driver Version : A.003 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. Page 7 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 Switching Characteristics (VCC = 5.0V, Ta = 25°C, GBC = 95 unless otherwise noted) CHARACTERISTIC SYMBOL GCK-to-OUT Propagation Delay tpLH DCK(rising)-to-DAO (‘L’ to ‘H’) Propagation Delay (‘H’ to ‘L’) CONDITION DCK(falling)-to-DAO VIH = VCC ⎯ 47.5 ⎯ ⎯ 25 ⎯ ⎯ 14.4 ⎯ 28.5 ⎯ ⎯ 24 ⎯ Rrext = 2.2 KΩ ⎯ 9.7 ⎯ ⎯ 15 ⎯ ⎯ 7.5 ⎯ td ⎯ 33 ⎯ top*1 ⎯ ⎯ 4.6 DCK(falling)-to-DAO Output Current Rise Time tor Output Current Fall Time tof VL = 5.0 V CL = 13 pF Output Current (Propagation Delay after LAT trigger) MAX. ⎯ tpHL Output to output Delay Time Unit TYP. VIL = GND GCK-to-OUT DCK(rising)-to-DAO MIN. UNIT ns ms Switching Characteristics (VCC = 3.3V, Ta = 25°C, GBC = 95 unless otherwise noted) CHARACTERISTIC SYMBOL TYP. MAX. ⎯ 51.5 ⎯ ⎯ 30.5 ⎯ ⎯ 18.3 ⎯ ⎯ 31.5 ⎯ ⎯ 29 ⎯ Rrext = 2.2 KΩ ⎯ 14.4 ⎯ VL = 3.3 V ⎯ 20 ⎯ ⎯ 10 ⎯ ⎯ 34 ⎯ ⎯ ⎯ 4.6 tpLH DCK(rising)-to-DAO DCK(falling)-to-DAO VIH = VCC GCK-to-OUT Propagation Delay DCK(rising)-to-DAO (‘H’ to ‘L’) MIN. GCK-to-OUT Propagation Delay (‘L’ to ‘H’) CONDITION VIL = GND tpHL DCK(falling)-to-DAO Output Current Rise Time tor Output Current Fall Time tof Output to output Delay Time Unit td Output Current (Propagation Delay after LAT trigger) CL = 13 pF top*1 UNIT VL VCC A DAI OUTn DCK CL CL CL CL REXT LAT SOMODE DAO /GCK Rrext CL GND Switching Characteristics Test Circuit *1 Reload the new PWM data at the end of the last PWM frame. 16-channel 16-bit PWM Constant Current LED Driver Version : A.003 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. Page 8 ns ms 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 Constant-Current Output Constant-current value (Iout*1) of each output channel is set by an external resistor connected between the REXT pin and GND. The current scale ranging can be adjusted from 5mA to 70mA by varying the resistor value. User can input GBC value to increase Iout to 90mA. The reference voltage of REXT terminal (Vrext) is approximately 1.23V. The output current value is calculated by the following equation: Iout(mA) 5 10 20 30 40 50 60 70 M 41.13 39.35 36.78 35.09 33.75 32.53 31.35 30.09 Output Current as a Functiono Rext value 80 70 Iout(mA) 60 Iout*1 (mA) ~ 50 V rext(V) × M Rrext (KΩ) 40 30 20 10 0 0 1 2 3 4 5 6 7 8 9 10 Rext(KΩ) Output Current as a Function of Output Voltage 80 70 Iout (mA) 60 50 40 30 20 10 0 0 0.5 1 1.5 2 2.5 3 Vout (V) In order to obtain a good performance of constant-current output, a suitable output voltage is necessary. Users can get related information about the minimum output voltage above. *1 Iout is typical current value setting under 100% PWM duty cycle and 95 DGBC Value. 16-channel 16-bit PWM Constant Current LED Driver Version : A.003 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. Page 9 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 Serial Data Interface The serial-in data (DAI) will be clocked into 16 × 16 bit shift registers synchronized on the rising edge of the clock (DCK). The data will be transferred into the 16 × 16 bit latch registers when the strobe signal ( LAT ) is kept at high level (level trigger); otherwise, the data will be held. The latch pulse should be sent after the falling edge of the last clock within a frame data. The trigger timing of the serial-out data (DAO) will be shifted out on synchronization to the rising edge of the clock if serial out selection (SOMODE) is kept at low level. And if serial out selection (SOMODE) is kept at high level, the serial-out data (DAO) will be shifted out on synchronization to the falling edge of the clock (DCK). Input Data Format Serial-out Data Format shift out first OUT 15 D15 [15] THF D15[13] D15 [12] D15[11] D15 [10] D15 [9] MSB D14 [15] D15[8] D15[7] D15 [6] D15[5] D15[4] D 15[3] D15 [2] D15[1] LSB OUT 14 D14[14] D14 [13] D14 [12] D14[11] D14 [10] D14[9] D14[8] D14 [7] E[15] D14[6] D14[5] D 14[4] D14 [3] D14[2] D 14[1] E[14] LSB MSB OUT 0 D0 [15] D0 [14] D0 [13] D0[12] D0 [11] D0[10] D0 [9] D0 [8] D0[7] D0 [6] D0 [5] D0[4] D 0[3] D0 [2] D0 [1] E[0] LSB MSB ＊E[15], E[14], ... E[ 0 ] are Error Messages of LED Open Detection. ｀1＇is normal, and ｀0＇is abnormal. ＊THF is the Error Message of chip thermal detection. ｀1＇is normal, and ｀0＇is abnormal. 16-channel 16-bit PWM Constant Current LED Driver Version : A.003 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. Page 10 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 LED Open/Short Detection DM634 provides a real time monitor of LED open / short detection function without extra components or circuit design. When O/S flag*1 set “L”, it will be identified as a LED open failure when the output is turned on but the output voltage is below 0.3V. The test result of each channel will write to its correspondent shift register which is in LSB position (D15[0], D14[0], …., D0[0]) while strobe signal is active. User can refer to timing diagram on page12. Detecting report could be retrieved from serial-out (DAO) data. If the system reads ‘1’ back, that indicates LED is in normal status. But if ‘0’ was retrieved, it means LED open failure has occurred. In the short detection, O/S flag set “H”. And system reads result as ‘1’ means normal, ‘0’ means LED short failure occurred. The short detection threshold voltage is 65% of VCC. In order to make sure LED open/short detection function is in well operating condition, it is recommended that all the luminance data are wrote to ‘1’ then almost turning on the outputs during detection process. Thermal Alarm and Shutdown During operation, when the junction temperature of the chip reaches approximately above 180℃, driver will shutdown all the outputs. Basically, the chip will cool down and return to the safe operating temperature which is approximately below 110℃. DM634 will restart all the outputs at the same time. Operating upon 180℃ may cause chip to be damaged permanently. Normal Normal Shutdown Shutdown Alarm T( ℃ ) 110 ℃ 180 ℃ DM634 provides a real time monitor of chip thermal alarm and shutdown function. Except avoid the damage occurs when local junction temperature over the limitation, system can recognize which chip is under this situation. When O/S flag set “ 0”, it will be identified as the chip thermal over 110℃ as the THF flag retrieved ‘ 0’. The test result of each chip will write to its correspondent shift register which is in the position (D255[0]) while strobe signal is active. User can refer to timing diagram on page14. Detecting report could be retrieved from serial-out (DAO) data. If the system reads ‘ 1’ back, that indicates chip is in normal status. But if ‘ 0’ was retrieved, it means the chip juction temperature is over 180℃ when O/S flag set to ‘ 1’ . *1 “L” is the default value of O/S flag. User can refer to Global Brightness Control to know how to set O/S flag on page 16. 16-channel 16-bit PWM Constant Current LED Driver Version : A.003 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. Page 11 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 Selection of Internal/External PWM Frequency The default operation mode is the free-running PWM signal generated by internal oscillator after power-on. Users could switch internal to external PWM frequency source by following timing sequence. There are two alternative options could be selected. The option 1 shows three rising edges of latch pulse ( LAT ) when the clock (DCK) kept at high level then two rising edges of clock (DCK) pulse when the latch pulse ( LAT ) kept at high level. Then the SOMODE/GCK pin could input external frequency to operate PWM function. The option 2 shows four rising edges of latch pulse( LAT ) when clock(DCK) kept at high level then sending three rising edges of clock (DCK) signal, while latch( LAT ) signal kept high level at the same time. Meanwhile the GCK external mode can be set back to the free-running mode. Notice that when internal RESET at low level, all the shift registers in DM634 will be cleared (Kept at Low level) and all output current will be off immediately. DCK LAT Normal Operation 1 t 2 1 DCK 2 3 DCK 1 2 3 1 LAT LAT RESET (internal) RESET (internal) 2 3 t t Option 1 : Timing Combination to set up external GCK mode 16-channel 16-bit PWM Constant Current LED Driver 4 Option 2 : Timing Combination to set up free-running mode Version : A.003 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. Page 12 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 Timing Diagram 1. DCK(rising edge) - DAI, DAO (SOMODE = ”L” at free-running mode, or external GCK mode) 2. DCK(falling edge) - DAO (SOMODE = “H” at free-running mode) tw DCK DCK 50% twDCK 50% 50% 50% 50% DAO 50% tpLH tpHL 3. DCK-LAT 50% 50% DCK t setup(L) t hold(L) 50% 50% LAT twLAT 4. Output to Output Delay Time Unit (n=2,3,4,5,6,7,10,11,12,13,14,15) 50% OUTn td 50% OUTn-2 5. GCK-OUT0 50% 50% GCK 50% OUT0 tpLH 16-channel 16-bit PWM Constant Current LED Driver 50% t pHL Version : A.003 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. Page 13 4 *5 256 DA [255] DA [0] 9 E[0]* 2 Frame Data A* 256 DB [0] DB[255] 1 DC[255] 2 DC[254] *7 65536 x GCK 256 DC[0] DC [255] 16-channel 16-bit PWM Constant Current LED Driver 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. Version : A.003 8 DC [253] Input GCK Frequency (Hz) Total PWM resolution (216) off on 0 1 low high 0 1 low high 0 1 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 Page 14 For example, if the refresh rate in display system is higher than 60Hz, the input GCK frequency must be higher than 4M Hz. Refresh Rate (Hz) = When using external frequency for PWM operation, the PWM refresh rate (frame rate) can be calculated by following equation : *6 *5 THFC 2 DD[254] Frame Data C* 1 DD[255] SOMODE function work in free-running mode. SOMODE default value is“L＂when external GCK mode selected. When switching to external GCK mode, all registers in DM634 will be reset simultaneously. *7 Starting the new PWM frame after the last PWM period finish competely. *8 When swithcing to GCK mode, outputs will be active after 65536 GCK pulses. *2 LAT is level trigger, not edge trigger. DA[1] 255 DB [1] THF is the flag of alarm / shutdown according to O/S flag is“L＂/“H＂ . 254 DB [2] *4 THFA 2 DB[2 54] *3 1 DB[255] Grayscale data clock-in period DAO is shifted out on synchronization to rising / falling edge of DCK according to SOMODE is “L＂ / “H＂. E[0] is the error message of LED open/short detection according to O/S flag is “L＂/“H＂. Frame Data Z 65536 x GCK(internal) E[0]*2 255 254 DZ[1] DA [1] DA[2] External GCK mode switch *1 (current ) OUTn SOMODE* /GCK 3 LAT* DAO *1 DCK DAI Grayscale data clock-in period 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DM634 Timing Diagram (free-running mode switch to external GCK mode example) 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 off on 0 1 high l ow 0 1 Frame Data E DF[253] low high THFF 2 THFE 4 1 Frame Data D 2 ED[253] THFD 2 Frame Data C OUTn (current ) SOMODE/GCK LAT DAO DCK 256 ED [255] 65536 x GCK 1 DE[254] DE[255] DD[0] DAI Grayscale data clock-in period 256 1 EE [255] 3 DE[0] Internal GCK mode switch 2 EE [253] 3 1 2 256 65536 x GCK(internal) DF [255] 1 0 DG[255] DF [0] DF[255] DF[254] Grayscale data clock-in period DG[254] 1 Timing Diagram (external GCK mode switch to free-running mode example) 16-channel 16-bit PWM Constant Current LED Driver Version : A.003 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. Page 15 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 Output Modulation Technique DM634 provides a new LED drive technique of output modulation. It mixes traditional Pulse Width Modulation (PWM) represented by LSB 12 bit with Sequential Split Modulation (SSM) represented by MSB 4 bit. The main benefits of SSM are to drive LED with an equivalent higher refresh rate (up to 380Hz in DM634 when FGCK = 25MHz) and change bit to next bit smoothly. The relationships between PWM and SSM in time domain can be refer to the diagram below (not to scale): A complete modulation cycle 0 8 1 9 2 10 3 11 4 12 5 13 6 14 7 15 Sequential Split Modulation represented by Bit [15:12] t Traditional PWM Width represented by Bit [11:0] Bit[15:0] MSB LSB 0000 XXXX,XXXXXXXX Bit[11:0] (PWM) A complete modulation cycle on off Bit[11:0] (PWM) on MSB LSB 0001 XXXX,XXXXXXXX off Bit[11:0] (PWM) on MSB LSB 0110 XXXX,XXXXXXXX off Bit[11:0] (PWM) on MSB LSB 0111 XXXX,XXXXXXXX off Bit[11:0] (PWM) on MSB LSB 1000 XXXX,XXXXXXXX off Bit[11:0] (PWM) on MSB LSB 1001 XXXX,XXXXXXXX off Bit[11:0] (PWM) on MSB LSB 1110 XXXX,XXXXXXXX off Bit[11:0] (PWM) on MSB LSB 1111 XXXX,XXXXXXXX 65536 clocks off t Ultra High Resolution Current Outputs DM634 could provide 16-bit linear PWM control current outputs for each channel. There are two advantages for system design. One is DM634 has sufficient bit resolution (65536 steps), not only LED color information but additional data such as global brightness, dot correction, and gamma correction can be represented by the proper algorithms. The other is to reduce a lot of clock and data rate compared to conventional ON-OFF type LED drivers. 16-channel 16-bit PWM Constant Current LED Driver Version : A.003 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. Page 16 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 High Accuracy Global Brightness Correction DM634 has built-in global brightness Correction feature. It can save PCB space and cost of system by eliminating the circuit of Rrext value adjusting or voltage drop adjusting across the external resistors. The output current is calculating by following equation*1*2*3: Iout*1 = Vrext / Rext x M*2 x ( 1 + DGBC*3)/96 Global Brightness data and Open/Short Flag format shift in first D C [6] D C [5] D C [4] D C [3] D C [2] D C [1] D C [0] O/S LSB MSB The Shift in data sequence of GBC data and detection flag as above. Dc[6], Dc[5] to Dc[0] are 7-bit data of GBC value. The last bit O/S is the flag of detection. When O/S flag set “L”, the LED open detection function be selected. Otherwise, if the flag set “H”, the LED short failure detection function be selected. . Global Brightness Control The default GBC data (DGBC) is “1011111” (Iout = 75% Imax*4 ) after power-on. Users could shift GBC data in by following timing sequence without changing luminous data. The sequence shows four triggering latch pulses ( LAT ) with high level clock (DCK), circuit switch into GBC mode at falling edge of the 4th latch pulse ( LAT ) then user can make eight triggering clock pulses to set 7-bit GBC data and O/S flag. Notice that PWM data won’t be changed while GBC data is latched. 1 2 254 255 256 1 2 3 4 5 6 7 8 DCK 1 2 3 4 LAT t Timing Combination to set GBC data and O/S flag *1 Iout is the current value setting under 100% PWM duty cycle. Vrext/Rext * M as the equation in Page 9. *3 DGBC is the data of global brightness correction. User can refer to Timing Sequence to know how to set DGBC on page 18. *4 Imax means the GBC data is “1111111”. *2 16-channel 16-bit PWM Constant Current LED Driver Version : A.003 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. Page 17 (current) OUTn *1 SOMODE/GCK LAT DAO DCK DAI 255 254 256 DA [255] 65536 x GCK(internal) DA [0] GBC mode switch GBCZ [6] 2 *1 GBCZ [4] Frame Data A GBCZ [5] 1 GBCA[6] GBCA[5] 8 O/SA GBCZ [0] 7 GBCA[0] GBC data clock-in period The difference between Frame data A and Aa is max output current. Frame Data Z E[0] DA [1] DA[2] DZ[1] Grayscale data clock-in period O/SZ DA [247] 1 2 DA [245] DB [254] DA [246] DB [255] 255 O/SZ DB [1] Frame Data Aa DB [255] 256 DB [0] Grayscale data clock-in period off on 0 1 low high 0 1 low high 0 1 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 Timing Diagram (GBC data input example) 16-channel 16-bit PWM Constant Current LED Driver 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. Version : A.003 Page 18 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 Output to Output Delay DM634 has build-in output to output delay with a special arrangement. This arrangement help chip avoid noise cause by large current during channels switching. The arrangement details are shown as following table. Channel 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Delay units 0 4 1 5 2 6 3 7 3 7 2 4 1 5 0 4 Power Dissipation The power dissipation of a semiconductor chip 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: Tj(junction temperature)(max)(°C)– Ta(ambient temperature)(°C) Pd(max)(Watt) = Rth(junction-to-air thermal resistance)(°C/Watt) The relationship between power dissipation and operating temperature can be referred to the figure below: 5 Power Dissipation Pd(W) 4.5 TSSOP24E Tj(max)=150°C 4 Rth(TSSOP24E)=29°C/Watt 3.5 Rth(SOP24)=50°C/Watt 3 Rth(SSOP24)=69°C/Watt SOP24 2.5 2 SSOP24 1.5 1 0.5 0 0 20 40 60 80 100 120 140 160 Ambient Temperature Ta ( ℃ ) The power consumption of IC can be determined by the following equation and should be less than the maximum allowable power dissipation: 16-channel 16-bit PWM Constant Current LED Driver Version : A.003 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. Page 19 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 Typical Application DM634 DM634 DM634 DM634 DM634 DM634 DM634 16-channel 16-bit PWM Constant Current LED Driver Version : A.003 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. Page 20 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 Package Outline Dimension DM634-SSOP SYMBOLS DIMENSIONS IN INCH DIMENSIONS IN MM A 0.053 0.064 0.069 1.346 1.626 1.753 A1 0.004 0.006 0.010 0.102 0.152 0.254 A2 - - 0.059 - - 1.499 b 0.008 - 0.012 0.203 - 0.305 C 0.007 - 0.010 0.178 - 0.254 D 0.337 0.341 0.344 8.560 8.661 8.738 E 0.228 0.236 0.244 5.791 5.994 6.198 e 0.025 BSC 0.635 BSC E1 0.150 0.154 0.157 3.810 3.912 3.988 L 0.016 0.025 0.050 0.406 0.635 1.270 L1 θ° 0.041 BSC 0 - 1.041 BSC 8 16-channel 16-bit PWM Constant Current LED Driver 0 - 8 Version : A.003 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. Page 21 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 Package Outline Dimension DM634-SOP DIMENSIONS IN INCH SYMBOLS DIMENSIONS IN MM A - - 0.104 - - 2.642 A1 0.004 - - 0.102 - - b 0.016 BSC 0.406 BSC D 0.612 0.618 0.624 15.545 15.697 15.850 E 0.292 0.296 0.299 7.417 7.518 7.595 e 0.05 BSC 1.270 BSC H 0.405 0.412 0.419 10.287 10.465 10.643 L 0.021 0.031 0.041 0.533 0.787 1.041 θ° 0 4 8 0 4 8 16-channel 16-bit PWM Constant Current LED Driver Version : A.003 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. Page 22 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 Package Outline Dimension DM634-TSSOP (exposed pad) 61cm DIMENSIONS IN INCH SYMBOLS DIMENSIONS IN MM A - - 0.047 - - 1.200 A1 0.000 - 0.006 0.000 - 0.150 A2 0.031 0.039 0.041 0.800 1.000 1.050 b 0.007 - 0.012 0.190 - 0.300 D 0.303 0.307 0.311 7.700 7.800 7.900 E1 0.169 0.173 0.177 4.300 4.400 4.500 E 0.252 BSC 6.400 BSC e 0.0256 BSC 0.650 BSC L1 0.039 REF 1.000 REF L 0.018 0.024 0.030 0.450 0.600 0.750 S 0.008 - - 0.200 - - θ° 0 - 8 0 - 8 PAD SIZE (112×18E) E2 0.090 - 0.112 2.280 - 2.850 D1 0.146 - 0.182 3.700 - 4.620 16-channel 16-bit PWM Constant Current LED Driver Version : A.003 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. Page 23 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DM634 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-channel 16-bit PWM Constant Current LED Driver Version : A.003 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. Page 24