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atmel led driver-MSLB9082 led backlight driver module compact, 8-channel, 20w led driver board with i 2 c interface datasheet
2 atmel led driver-MSLB9082 general description the atmel ? compact, 8-channel led driver board is a complete led backlight driver solution using the atmel led driver-msl3162 for medium-sized lcd panels. each channel drives up to 10 series-connected leds at up to 160ma per channel. the driver board is configured to operate from a 10 - 16v input voltage. the full-scale led current is preset to 50, 60, 70, or 80ma per led string, selected by an onboard switch. current can be reduced from full scale through the i 2 c serial interface in 64 linear steps. digital (pwm) dimming is available through an external signal or by using the internal pwm generator via the serial interface. atmel led driver-MSLB9082 led backlight driver module compact, 8-channel, 20w led driver board with i 2 c interface the optional microcontroller board and graphical user interface (gui) software allow control of the driver board through a personal computer. this gives access to the internal features of the msl3162, including fault detection, digital control of led current, individual led string on/off control, and internally generated pwm dimming. the compact eight-channel led driver board is intended for evaluation, prototyping, or small production runs. gerber files and cadence orcad layout files are available to allow the circuit to be integrated into a larger system for large production runs. applications ? lcd panel led backlight driver ordering information part description MSLB9082 compact, 8-channel led driver module
3 atmel led driver-MSLB9082 atmel led driver-MSLB9082 led backlight driver module compact, 8-channel, 20w led driver board with i 2 c interface ? drives up to 8led strings ? up to 10 leds per string ? up to 160ma per led string ? internally generated pwm dimming ? i2c serial interface ? fault detection and protection ? 10 to 16v input voltage range ? up to 20w output power ? small size, 1.0 x 2.0 ? four available i2c slave addresses, switch selectable ? four full-scale current settings, switch selectable ? four available voltage ranges to support multiple panels ? 1.4mhz switching frequency ? internal or external pwm dimming control ? digital control of led string current ? individual led string on/off digital control ? short circuit or open circuit led string detection ? automatic over-voltage protection key features led driver board 2.0 (50.8mm) 1.0 (25.4mm)
4 atmel led driver-MSLB9082 mechanical drawing figure 1. atmel led driver-MSLB9082 mechanical drawing. all dimensions in inches. connector pin descriptions table 1. j2 input connector pin descriptions pin name pin number pin description pwr 1,2 i nc 3 n nc 4 n nc 5 n sda 6 i2c scl 7 i2c fltb a en e pwm 10 pwm gnd 11,12 g table 2. j3 output connector pin description s
5 atmel led driver-MSLB9082 pin name pin number pin description vled 1- led stra led a msl3162 str0 str1 strb 10 led b msl3162 str2 str3 strc 11 led c msl3162 str4 str5 strd 12 led d msl3162 str6 str7 stre 13 led e msl3162 str str strf 14 led f msl3162 str10 str11 strg 15 led g msl3162 str12 str13 strh 16 led h msl3162 str14 str15 gnd 17-20 g absolute maximum ratings voltage (with respect to gnd) str1-str6 ............................................................................................................................................................................................. -0.3v to +40v vled ............................................................................................................................................................................................................. -0.3v to +40v pwr .............................................................................................................................................................................................................. -0.3v to +25v en, pwm, sda, scl, fltb ....................................................................................................................................................... -0.3v to +5.5v ambient operating temperature range t a = t min to t max .................................................................................... -40c to +50c table 3: electrical operating characteristics (typical application circuit, vin = 12v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c) parameter conditions and notes min typ max unit dc electrical characteristics p 10 16 v en 23 v en 0 v pwm, sda, scl 2 v pwm, sda, scl 0 v fltb i fltb 1a 01 v fltb v fltb 36v 1 a str1-str istr n n n n n n n n atmel led driver-MSLB9082 led backlight driver module compact, 8-channel, 20w led driver board with i 2 c interface
6 atmel led driver-MSLB9082 parameter conditions and notes min typ max unit ac electrical characteristics pwm 20 h parameter conditions and notes min typ max unit i2c switching characteristics scl i 2 c n 1 1000 h b 25 b stop start 05 h start 026 s- start 026 s- stop 026 d 10 d n 2 005 045 d n 3 005 045 d - 100 low scl 05 high scl 026 f sda scl 4,5 120 r sda scl 120 p suppressed by the input flter note 1. minimum scl clock frequency is limited by the bus timeout feature, which resets the serial bus interface if either sda or scl is held low for 25ms. disable bus timeout feature for dc operation. note 2. time for acknowledge signal from scl low to sda (out) low. note 3. minimum time for sda data out to be valid following scl low. note 4. a master device must internally provide a hold time of at least 300ns for the sda signal (refer to the v il of the scl signal) in order to bridge the undefined region of scl falling edge. note 5. the maximum fall times for the sda and scl bus lines are specified at 300ns. the maximum fall time for the sda output stage is specified at 250ns. this allows series protection resistors to be connected between sda and scl and the sda/scl bus lines without exceeding the maximum specified fall time. note 6. input filters on the sda, scl, and ad0 inputs suppress noise less than 50ns
7 atmel led driver-MSLB9082 string phasing efficiency optimizer initial calibration typical performance characteristics atmel led driver-MSLB9082 led backlight driver module compact, 8-channel, 20w led driver board with i 2 c interface
8 atmel led driver-MSLB9082 typical performance characteristics (continued) efficiency optimizer auto recalibration the MSLB9082 is a stand-alone, eight-channel led driver board suitable for integration into small-production devices. it includes an i 2 c serial interface for accessing the digital features of the msl3162 led driver. it has onboard switches that set the i 2 c slave address to one of four available addresses, a switch to set the full-scale led current to 50, 60, 70, or 80ma in single-string mode, and 100, 120, 140, or 160ma in dual-string mode, and a switch to set the maximum led voltage to 39, 36, 32, or 28v. the board is powered from a single input voltage between 10v and 16v. input power the MSLB9082 board is powered from a single input voltage ranging from 10 to 16v. setting the full-scale led current the msl3162 regulates the led string current. the led string current is set by a current sense resistor. four different values are programmed to the MSLB9082 led driver module, and switch s2 selects one of those resistors to set the full-scale, per-string led current to 50, 60, 70, or 80ma. table 4 shows the switch settings and the full-scale, per-string led current for each setting. table 4 : full-scale, per-string led current (s2) settings detailed description
9 atmel led driver-MSLB9082 full-scale led current switch s2 position full-scale, per- string led current full-scale led current switch s2 position full-scale, per- string led current p 1 50a p 3 70a p 2 60a p 4 0a when using the i 2 c serial interface, the per-string led current is changed from the full-scale value by programming the i strn register, where n is the led string number from 0 to 15. the i strn register is a 6-bit word that sets the led current for each led string to one of 64 linear levels. the per-string led current is: i strn = i str_full istrn+1 , 64 where i srtn is the current of led string n , i str_full is the full-scale led current set by s2, and isrt n is the value of the current setting register for string n between 0 and 64 (0x3f). atmel led driver-MSLB9082 led backlight driver module compact, 8-channel, 20w led driver board with i 2 c interface
10 atmel led driver-MSLB9082 i 2 c serial interface the MSLB9082 driver module uses an i 2 c/smbus serial interface for digital led control and fault detection. four slave id addresses are available, and are selected by the i 2 c address selection switch. the addresses are shown in table 5. table 5 : i 2 c slave address switch (s1) settings address switch s1 position i2c slave address address switch s1 position i2c slave address p 1 0a0 p 3 0a4 p 2 0a6 p 4 0a2 there are a number of features available through the i 2 c serial interface. table 5 shows the registers for the msl3162 led driver.
11 atmel led driver-MSLB9082 table 6. atmel led driver-msl3162 register map register add- ress default values function register data d7 d6 d5 d4 d3 d2 d1 d0 control0 000 055 led str7en str6en str5en str4en str3en str2en str1en str0en control1 001 055 str15en str14en str13en str12en str11en str10en stren stren powerctrl 002 07f f confguration effciency confguration effciency confguration atmel led driver-MSLB9082 led backlight driver module compact, 8-channel, 20w led driver board with i 2 c interface
12 atmel led driver-MSLB9082 register add- ress default values function register data d7 d6 d5 d4 d3 d2 d1 d0 frate 02a 001 phi - - - frate40 gint 02b 02b g - - gint60 istr0 030 020 led 6- - - istr050 t istr15 03f - - istr1550 phdly0 040 000 led - pwm phdly070 phdly1 041 000 phdly1 70 phdly2 042 020 phdly270 phdly3 043 020 phdly370 phdly4 044 040 phdly470 phdly5 045 040 phdly570 phdly6 046 060 phdly670 phdly7 047 060 phdly770 phdly 04 00 phdly70 phdly 04 00 phdly70 phdly10 04a 0a0 phdly1070 phdly11 04b 0a0 phdly1170 phdly12 04c 0c0 phdly1270 phdly13 04d 0c0 phdly1370 phdly14 0x4e 0e0 phdly1470 phdly15 04f 0e0 phdly1570 pwm0 050 030 led - pwm pwm070 t pwm15 05f pwm1570 d 060 0f e2addr 00 u eeprom - e2addr60 e2ctrlsta 01 e2busy bldact e2err slvatcnt10 rwctrl10 for detailed descriptions of the msl3162 register-controlled operating modes, see the msl3162 datasheet. table 6. atmel led driver - msl3162 register map
13 atmel led driver-MSLB9082 setting the internal pwm dimming frequency and duty cycle the msl3162 internally generates the pwm dimming duty cycle and frequency. the pwm dimming frequency is programmable, as are the pwm duty cycle and phasing between led strings. setting the pwm dimming frequency the pwm frequency (phi frequency) is internally set by the iphigen register. this 16-bit number sets the divider ratio from an internal 2.5mhz clock. therefore, the pwm frequency is: iphigen mhz f pwm 5 . 2 = for high dimming accuracy, keep the pwm dimming frequency below 10khz. to set the pwm frequency, program the iphigen register between 38hz and 10khz per the equation: pwm f mhz iphigen 5 . 2 = , where iphigen ranges between 250 (0x00fa) and 65535 (0xffff) for full pwm dimming resolution, make sure that the ratio between the igscgen register and iphigen register is 32. see setting the pwm dimming resolution for more details. setting the pwm dimming resolution the msl3162 uses the iphigen register to set the pwm dimming frequency, and it uses the igscgen register to set the pwm dimming resolution (gsc frequency). the msl3162 internally counts using the frequency set by the igscgen register to set the pwm duty and phasing. full pwm dimming is achieved if the ratio of igscgen to iphigen is less than 32. if the ratio is greater than 32, then the maximum achievable duty cycle is: ? ? ? ? ? ? ? = iphigen igscgen d max 1 32 for d max >1, the maximum duty cycle is 100%. setting the led pwm dimming duty cycle the msl3162 allows each led string to operate at different duty cycles and phases. the per-string pwm dimming duty cycle for any led string is set by the pwm n register, where n is the led string number. the msl3162 also offers pwm dimming of all strings simultaneously through the global intensity (gint) register. each string pwm on time is set by the eight most-significant bits of the product of the pwmn and gint registers, multiplied by the gsc period: 20 64 64 t ? ? ? ? ? ? ? ? ? ? ? ? ? = ? ? ? ? ? ? ? ? ? ? ? ? ? ? = * * 1 * * 1 gint pwmn mhz igscgen gint pwmn f gsc on_pwmn t on_pwmn where pwmn ranges from 0 to 256 (0xff) and gint ranges from 0 to 64 (0x3f). setting the led pwm dimming phasing each led strings pwm dimming occurs with independent phasing. this is useful to force phase shifted pwm dimming, which reduces the transient load on the dc-dc converter, improving performance. the phase of each led string is set by phdly n , where n is the led string number. the msl3162 counts gsc pulses to determine the on-time delay from the beginning of each phi frame. for example, if phdly0 is set to 0x00, the led string 0 on time starts at the beginning of a phi frame. if phdly0 is set to 0x40, the led string 0 on time begins at 64 (0x40) gsc pulses after the beginning of a phi frame. 20 phdlyn mhz igscgen t phdlyn f t phdlyn gsc phdlyn * 1 * 1 ? ? ? ? ? ? ? = ? ? ? ? ? ? ? ? = atmel led driver-MSLB9082 led backlight driver module compact, 8-channel, 20w led driver board with i 2 c interface
14 atmel led driver-MSLB9082 setting the led voltage range the msl9082 led driver board uses four different voltage ranges to power the leds, which are set through the s3 switch. the ranges are shown in table 7. the msl3162 automatically adjusts the led voltage over a 7.4v range to minimize power loss while maintaining enough current sink headroom to keep the led string current accurate. choose an led voltage range that suits the leds used so that the msl3162 can adjust the voltage to optimize for the led voltage. for more information, consult the msl3162 data sheet. table 6 : led voltage settings voltage switch s3 position led voltage range voltage switch s3 position led voltage range position 1 28.8v to 21.3v position 3 37.1v to 29.6v position 2 39.7v to 32.3v position 4 33.0v to 25.6v
15 atmel led driver-MSLB9082 on/off (en) control input the on/off control input, pin 9 of input connector j2, turns on/off the led driver. drive it high (between 2.3 and 5v) to turn on the led driver, and drive it low (0 to 0.8v) to turn it off. the on/off control input is internally pulled up by a 100k resistor. for automatic start-up, leave en unconnected. external pwm control input the msl3162 operates in one of three modes: internal pwm mode, external pwm mode, or gated pwm mode. internal pwm mode dims the leds with a frequency and phase set by the msl3162, and the state of the pwm input is ignored and has no effect on led brightness. in this case, each string can have a different pwm set by the msl3162s pwm n register setting. to control the brightness of all leds simultaneously, set the gint register between 0 and 3f. external pwm and gated pwm modes use the duty cycle of the signal applied to the pwm input; connector j2, pin 10. the pwm input is pulled high through a 100k resistor. if not used, leave pwm unconnected or drive it high. the msl3162 digitizes the pwm input signal and determines the duty cycle of that signal. this value replaces the gint register value to control the global brightness (of all leds simultaneously). in this case, individual string brightness is controlled through the pwm n register. gated pwm mode turns on all leds when pwm is driven high, and turns them off when pwm is driven low. by programming the pwm n registers and gint for 100% duty cycle, the leds are directly pwm dimmed by the signal applied to the pwm input. fault indicator output the msl3162 includes fault detection circuitry that detects and open-circuited led string, and an led string with one or more short-circuited leds. if any fault is detected, the output is driven low. use this output as an alert signal to a system controller. once the controller gets the alert signal, it determines which led is faulty by reading the status, ocstatus, and scstatus registers through the i 2 c serial interface. connecting the leds to the atmel led driver- msl9082 led driver the MSLB9082 driver board drives led arrays with up to eight parallel strings of up to 12 series leds each through the output connector, j3. eight connections for led cathode connections allow the use of separate led strings or common-anode-connected led strings. driving leds with greater than 80ma led current the msl3162 is capable of driving up to 80ma per led string. the MSLB9082 board has two string drivers connected to each driver connection (stra- strh), with one disabled. this allows driving up to 180ma per led string by enabling the two drivers and setting the same pwm duty ratios and phasing for both msl3162 driver inputs (dual-string mode). see the msl3162 datasheet for more details on programming the msl3162. table 8 shows the switch settings and the full-scale, per-string led current for each setting when operating in parallel mode. atmel led driver-MSLB9082 led backlight driver module compact, 8-channel, 20w led driver board with i 2 c interface
16 atmel led driver-MSLB9082 table 8. settings for higher currents full-scale led current switch s2 position full-scale, per- string led current full-scale led current switch s2 position full-scale, per- string led current position 1 100ma position 3 140ma position 2 120ma position 4 160ma
17 atmel led driver-MSLB9082 atmel led driver-MSLB9082 schematic figure 2 : atmel led driver-MSLB9082 board schematic. atmel led driver-MSLB9082 led backlight driver module compact, 8-channel, 20w led driver board with i 2 c interface
18 atmel led driver-MSLB9082 atmel led driver-MSLB9082 component placement figure 3: evu-msl3162-blu1 component placement.
19 atmel led driver-MSLB9082 i tem quantity reference part 1 1 c1 1 f/6.3v 2 1 c2 4.7 f/6.3v 3 4 c3,c4,c13,c14 2.2 f/100v 4 1 c5 2.2 f 5 2 c8,c9 1 f/25v 6 1 c10 0.1 f/25v 7 1 c11 3.3nf 8 1 c12 0.01f 9 1 d1 schottky rectifer, diodes dlfs140 10 1 d2 schottky rectifer, central cmad6263 11 1 j1 12-position connector, jst sm12b-srss 12 1 j2 20-position connector, jst sm20b-srss 13 1 l1 5.6uh inductor, sumida cdrh5d20-5r6 14 2 r1,r5 do not stuff 15 1 r3 100k? 16 1 r4 165k? 17 1 r7 42.2k? 18 1 r8 26.1k? 19 1 r9 30.1k? 20 1 r10 34.8k? 21 1 r11 4.7k? 22 1 r12 80k? 23 1 r13 7.50k? 24 1 r14 6.49k? 25 1 r15 5.76k? 26 1 r16 5.36k? 27 3 sw1,sw2,sw3 4-position switch, copal cs-4-14 28 1 u1 16-channel led driver, msl3162 29 1 u3 5v regulator, micrel mic5233 30 1 u4 boost regulator, ti tps61175 atmel led driver-MSLB9082 bill of materials atmel led driver-msl3162 led driver board revised: wednesday, october 7, 2009 revision: 3 atmel led driver-MSLB9082 led backlight driver module compact, 8-channel, 20w led driver board with i 2 c interface
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