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dm114 DM115 version : a.002 issue date : 2005/03/18 file name : sp- dm1145-a.002 total pages : 17 8-bit constant current led drivers with 3.3v ~ 5v supply voltage ?W@^?I? 9?7?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
dm114 dm11 5 c???? silicon touch technology inc. 8-bit constant current led driver s with 3.3v~5v supply voltage version:a.002 page 1 preliminary dm114 DM115 8-bit constant current led drivers with 3.3v ~ 5v supply voltage general description the dm114 DM115 is the constant current driver specifically designed for led display applications. the value of constant current can be varied using an external resistor. the devices include an 8-bit shift register, latches, and constant current drivers on a single silicon cmos chip. features maximum output voltage: 17v maximum clock frequency: 25mhz (cascade operation) power supply voltage: 3.3v to 5.0v cmos compatible input package: pdip16, sop16, ssop16 package and pin layout: pin layout and functionality are similar to those of the st2221a. (each characteristic value is different.) constant current matching: (ta = 25 c v dd = 5.0v) chip-to-chip: 10.0% dm114: bit-to-bit: 4.0% @ i out = 30 ~ 90ma 6.0% @ i out = 20 ~ 30ma DM115: bit-to-bit: 4.0% @ i out = 20 ~ 60ma 6.0% @ i out = 5 ~ 20ma
dm114 dm11 5 c???? silicon touch technology inc. 8-bit constant current led driver s with 3.3v~5v supply voltage version:a.002 page 2 preliminary pin connection (top view) block diagram gnd serial-in serial-out cloc k out0 out1 out2 out3 out4 out5 out6 out7 r-ext v dd 8 7 6 5 4 3 2 1 9 10 11 12 13 14 15 16 enable latch ck ck d d q q d st q clock ck d q i-reg. serial-in latch enable r-ext serial-out out7 out1 out0 d d st st q q delay unit delay unit delay unit
dm114 dm11 5 c???? silicon touch technology inc. 8-bit constant current led driver s with 3.3v~5v supply voltage version:a.002 page 3 preliminary timing diagram (note) latches are level sensitive (not edge triggered). latch-terminal = h level, latches become transparent; latch-terminal = l level, latches hold data. enable-terminal = h level, all outputs (out0~7) are off. an external resistor is connect ed between r-ext and gnd for setting up the value of constant current. serial-out changes state on the rising edges of clock. pin description pin no. pin name function 1 gnd gnd terminal 2 serial-in input terminal of a data shift register 3 clock input terminal of a clock for shift register 4 latch input terminal for data strobe 5~12 out0~7 output terminals 13 enable input terminal for output enable (active low) 14 serial-out output terminal of a data shift register 15 r-ext input terminal of an external resistor 16 v dd 3.3/5v supply voltage terminal out7 serial-out out2 out1 out0 latch 0v 3.3/5v 0v 3.3/5v serial in cloc k 0v 3.3/5v off 0v off on off on off 0v 3.3/5v 3.3/5v enable
dm114 dm11 5 c???? silicon touch technology inc. 8-bit constant current led driver s with 3.3v~5v supply voltage version:a.002 page 4 preliminary equivalent circuit of inputs and outputs 1. enable terminal 2. latch terminal 3. clock, serial-in terminal 4. serial-out terminal input vdd gnd rin (up) input vdd gnd rin (down) input vdd gnd serial_out vdd gnd
dm114 dm11 5 c???? silicon touch technology inc. 8-bit constant current led driver s with 3.3v~5v supply voltage version:a.002 page 5 preliminary maximum ratings ( ta = 25 c, tj (max) = 150 c ) characteristic symbol rating unit supply voltage v dd 0 ~ 7.0 v input voltage v in -0.4 ~ vdd+0.4 v 90 (dm114) output current i out 60 (DM115) ma output voltage v out -0.3 ~ 17 v clock frequency f clk 25 mhz 750 gnd terminal current i gnd 500 ma 1.64 ( pdip-16 : ta=25 c) 1.08 ( sop-16 : ta=25 c) power dissipation p d 0.8 ( ssop-16 : ta=25 c) w 76 ( pdip-16 ) 115 ( sop-16 ) thermal resistance r th(j-a) 155 ( ssop-16 ) c/w storage temperature t stg -55 ~ 150 c recommended operating condition characteristic symbol condition min. typ. max. unit supply voltage v dd ? 3.0 ? 5.5 v output voltage v out ? ? ? 17 v operating temperature t opr ? -40 ? 85 i o outn ? ? 60 i oh serial-out ? ? 1.0 output current i ol serial-out ? ? -1.0 ma v ih ? ? ? -0.3 ? 0.3vdd 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) v dd = 3.0 ~ 5.5 v 15 ? ? ns clock frequency f clk 2 chips cascade operation ? ? 25 mhz ta = 85 c(pdip-16) ? ? 0.85 ta = 85 c(sop-16) ? ? 0.56 power dissipation p d ta = 85 c(ssop-16) ? ? 0.41 w
dm114 dm11 5 c???? silicon touch technology inc. 8-bit constant current led driver s with 3.3v~5v supply voltage version:a.002 page 6 preliminary electrical characteristics (vdd = 5.0 v, ta = 25 c unless otherwise noted) characteristic symbol condition min. typ. max. unit input voltage ?h? level v ih ? 0.7vdd ? vdd input voltage ?l? level v il ? gnd ? 0.3vdd v output leakage current i oh voh = 17 v ? ? 1.0 ua v ol iol = 1.0 ma, vdd=5v ? ? 0.4 v oh ioh = -1.0 ma, vdd=5v 4.6 ? ? v ol iol = 1.0 ma, vdd=3.3v ? ? 0.4 output voltage ( s - out) v oh ioh = -1.0 ma, vdd=3.3v 2.7 ? ? v dm114 rext = 390 ? output current (bit-bit) iout DM115 vout = 1.2v (1 channel on) rext = 780 ? ? 1.5 4 % dm114 rext = 390 ? 36.0 40.0 44.0 output current (chip-chip) iout DM115 vout = 1.2v (1 channel on) rext = 780 ? 18.0 20.0 22.0 ma output voltage regulation % / v out vdd = 3.3v ~ 5.0v ? 0.1 0.5 % / v pull-up resistor r in(up) ? 200 400 600 k ? pull-down resistor r in(down) ? 100 200 300 k ? rext = open, all outputs off ? 1.3 ? dm114 r ext = 200 ? , out0~7 = off 11.0 rext = open, all outputs off ? 5.0 ? supply current ?off? idd (off) vdd=5v DM115 r ext = 300 ? , out0~7 = off ? 11.0 ? dm114 r ext = 200 ? , out0~7 = on ? 11.0 ? supply current ?on? idd (on) vdd=5v DM115 r ext = 300 ? , out0~7 = on ? 11.0 ? ma rext = open, all outputs off ? 1.1 ? dm114 r ext = 200 ? , out0~7 = off 10.7 rext = open, all outputs off ? 1.1 ? supply current ?off? idd (off) vdd=3.3v DM115 r ext = 300 ? , out0~7 = off ? 7.2 ? dm114 r ext = 200 ? , out0~7 = on ? 10.7 ? supply current ?on? idd (on) vdd=3.3v DM115 r ext = 300 ? , out0~7 = on ? 7.2 ? ma
dm114 dm11 5 c???? silicon touch technology inc. 8-bit constant current led driver s with 3.3v~5v supply voltage version:a.002 page 7 preliminary switching characteristics (ta = 25 c unless otherwise noted) dm114 characteristic symbol condition min. typ. max. unit enable-outn ? 40 80 propagation delay time (?l? to ?h?) clk-sout tp lh ? 16 20 ns enable-outn ? 70 140 propagation delay time (?h? to ?l?) clk-sout tp hl ? 16 20 ns output current rise time t or ? 250 400 ns output current fall time t of vdd=5.0v vih=vdd vil=gnd rext=210 ? vl=5.0v rl=47 ? cl=15pf ? 30 50 ns DM115 characteristic symbol condition min. typ. max. unit enable-outn ? 40 80 propagation delay time (?l? to ?h?) clk-sout tp lh ? 16 20 ns enable-outn ? 70 140 propagation delay time (?h? to ?l?) clk-sout tp hl ? 16 20 ns output current rise time t or ? 10 15 ns output current fall time t of vdd=5.0v vih=vdd vil=gnd rext=630 ? vl=5.0v rl=150 ? cl=15pf ? 30 50 ns note: (delay between outputs) the dm114 DM115 also incorporated the delay unit between outputs. the delay time is 4 ns(typ.), out7 has no delay, out5 has 4 ns delay, out 3 has 8 ns delay, and then out 1, out 0, out 2, out 4, out6. the delay is to prevent large current impulse.
dm114 dm11 5 c???? silicon touch technology inc. 8-bit constant current led driver s with 3.3v~5v supply voltage version:a.002 page 8 preliminary test circuit dc characteristic ac characteristic i dd i il ,i ih v il ,v ih i re f i ol serial-out out7 out0 v dd gnd r-ext latch serial-in enable clock v il ,v ih v l c l c l c l r l r l serial-out out7 out0 v dd gnd r-ext latch sw- matrix serial-in enable clock
dm114 dm11 5 c???? silicon touch technology inc. 8-bit constant current led driver s with 3.3v~5v supply voltage version:a.002 page 9 preliminary timing diagram 1. clock-serial out, outn 2. clock-latch 3. enable-outn (current) 50% 50% 50% 50% t phl t plh outn enable 50% ?l? level = data hold serial-in latch clock t setup(l) 50% tw (lat) 50% t hold t setup 50% 50% 90% 50% 50% 10% 10% 50% 90% serial-in outn (current) clock t wclk t f t r 90% 50% 10% 10% 50% 90% t of t phl t plh t or t wclk serial-out 50% 50% t plh t phl
dm114 dm11 5 c???? silicon touch technology inc. 8-bit constant current led driver s with 3.3v~5v supply voltage version:a.002 page 10 preliminary output current vs. external resistor dm114 DM115 dm114: iout 1.3v / rext * 12 DM115: iout 1.3v / rext * 12.5 output current performance vs. output voltage dm114 DM115 note: 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. 0 10 20 30 40 50 60 70 80 90 0 100 200 300 400 500 600 700 800 900 rext (ohm) iout (ma) 0 10 20 30 40 50 60 70 0 200 400 600 800 1000 1200 1400 1600 1800 rext (ohm) iout (ma) 0 5 10 15 20 25 30 35 40 45 50 55 60 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 vout (v) iout (ma) 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 vout (v) iout (ma)
dm114 dm11 5 c???? silicon touch technology inc. 8-bit constant current led driver s with 3.3v~5v supply voltage version:a.002 page 11 preliminary note as the power dissipation of a semiconductor chip is limited its package and ambient temperature, this device requires a maximum output current be calculated for a given operating condition. the maximum allowable power consumption (pd (max)) of this device is calculated as follows: ) / ( rth ) )( ) emperature (ambient t ta - (max) e) temperatur (junction (tj ) (max)( watt c c watt pd = based on the pd (max), the maximum allowable current can be calculated as follows: iout = ( pd ? v dd ? i dd ) / ( # outputs ? vo ? duty ) imax - ta ( DM115 ) 0 10 20 30 40 50 60 70 0 20 40 60 80 100 120 140 160 ta imax (ma) imax - ta ( dm114 ) 0 10 20 30 40 50 60 70 80 90 100 0 20 40 60 80 100 120 140 160 ta imax (ma) pd - ta 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 0 20 40 60 80 100 120 140 160 ta pd (w) dip sop ssop dip sop ssop dip sop ssop
dm114 dm11 5 c???? silicon touch technology inc. 8-bit constant current led driver s with 3.3v~5v supply voltage version:a.002 page 12 preliminary system configuration example [1] output current (i out ) sink current is set by the external resistor as shown in figure (iout vs. rext). [2] led supply voltage (v led ) setup v led = v ce ( t r v sat ) + v f ( led forward voltage ) + v o ( ic supply voltage) to prevent too much power dissipated by the device due to higher v led , an additional r can be used to reduce the vout when the outputs consume current: r = (max) (max) (min) bit i v v v o o f led ? ? ? note this device has only one ground pin shared by signal, output sink current, and power ground. it is advisable to pattern the ground layout w ith minimized inductance such that the switching noise induced by the input signals and the output sink current would not cause chip malfunction. to prevent the drivers? outputs from damage by overshoot stress, it is al so advisable not to turn off the drivers and scan transistors simultaneously. v dd serial-out r v led = 3~4 (v) out7 out0 gnd r-ext latch cpu serial-in enable scan clock serial-out out7 out0 gnd r-ext latch serial-in enable clock vo
dm114 dm11 5 c???? silicon touch technology inc. 8-bit constant current led driver s with 3.3v~5v supply voltage version:a.002 page 13 preliminary package outline pdip16 unit: mm 16 9 1 8 6.35 0.13 weight : 1.11g(typ.) 7.62 0~15 9.02 0508 19.69max 0.4572 1.524 2.54 19.18 0.51 3.3 0.254
dm114 dm11 5 c???? silicon touch technology inc. 8-bit constant current led driver s with 3.3v~5v supply voltage version:a.002 page 14 preliminary package outline sop16 10 1.5 1.75 0.25 0.25 1.27 1.27 0.56 1 16 9 8 0.51 4.0max 6.2max unit: mm
dm114 dm11 5 c???? silicon touch technology inc. 8-bit constant current led driver s with 3.3v~5v supply voltage version:a.002 page 15 preliminary package outline ssop16 unit: mm 1 8 16 9 0.229 0.635 0.3max 3.91 5.99 0.635 0.254 1.63 max 1.5 0.15 4.9
dm114 dm11 5 c???? silicon touch technology inc. 8-bit constant current led driver s with 3.3v~5v supply voltage version:a.002 page 16 preliminary the products listed herein are designed for or dinary electronic applications, such as electrical appliances, audio- visual equipment, communica tions devices and so on. hence, it is advisable that the devices s hould not be used in medical instruments, surgical implants, aerospace machiner y, nuclear power control systems, disaster/crime-prevention equipment a nd 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 a bove. anyone who purchases any products described herein with the above-menti oned intention or with such misused applications should accept full respons ibility and indemnify. silicon touch technology, inc. and its dist ributors and all their officer s 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.

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