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DM115B version : a.001 issue date : 2007/02/07 file name : sp - DM115B-a.001 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
dm115 b c???? silicon touch technology inc. 8-bit constant current led drivers with 3.3v~5v supply voltage version:a.001 page 1 DM115B 8-bit constant current led drivers with 3.3v ~ 5v supply voltage general description the DM115B is the constant current driver speci fically designed for led display applications. the value of constant current can be varied using an external resi stor. the devices include an 8-bit shift register, latches, and constant current drivers on a single silicon cmos chip. features z maximum output voltage: 17v z maximum clock frequency: 25mhz (cascade operation) z power supply voltage: 3.3v to 5.0v z cmos compatible input z package: pdip16, sop16, ssop16 z package and pin layout: pin layout and functionality are similar to those of the st2221a. (each characteristic value is different.) z constant current matching: (ta = 25 c v dd = 5.0v) chip-to-chip: 10.0% bit-to-bit: 4.0% @ i out = 20 ~ 60ma 6.0% @ i out = 5 ~ 20ma
dm115 b c???? silicon touch technology inc. 8-bit constant current led drivers with 3.3v~5v supply voltage version:a.001 page 2 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
dm115 b c???? silicon touch technology inc. 8-bit constant current led drivers with 3.3v~5v supply voltage version:a.001 page 3 timing diagram (note) latches are level sensitive (not edge triggered). latch-terminal = h level, latches become transpar ent; latch-terminal = l level, latches hold data. enable-terminal = h level, a ll outputs (out0~7) are off. an external resistor is connected 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
dm115 b c???? silicon touch technology inc. 8-bit constant current led drivers with 3.3v~5v supply voltage version:a.001 page 4 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
dm115 b c???? silicon touch technology inc. 8-bit constant current led drivers with 3.3v~5v supply voltage version:a.001 page 5 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 output current i out 60 ma output voltage v out -0.3 ~ 17 v clock frequency f clk 25 mhz gnd terminal current i gnd 500 ma 1.64 ( pdip-16 : ta=25 c) 1.08 ( sop-16 : ta=25 c) 0.8 ( ssop-16 : ta=25 c) single-layer power dissipation p d 1.47 ( ssop-16 : ta=25 c) 4-layer w 76 ( pdip-16 ) 115 ( sop-16 ) 155 ( ssop-16 ) single-layer thermal resistance r th(j-a) 85 (ssop-16) 4-layer 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 ? 0.7vdd ? vdd+0.3 input voltage v il ? -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) 5 ? ? 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
dm115 b c???? silicon touch technology inc. 8-bit constant current led drivers with 3.3v~5v supply voltage version:a.001 page 6 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 output current (bit-bit) iout vout = 1.2v (1 channel on) rext = 780 ? 1.5 4 % output current (chip-chip) iout 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 ? 5.0 ? supply current ?off? idd (off) vdd=5v r ext = 300 , out0~7 = off ? 11.0 ? supply current ?on? idd (on) vdd=5v r ext = 300 , out0~7 = on ? 11.0 ? ma rext = open, all outputs off ? 1.1 ? supply current ?off? idd (off) vdd=3.3v r ext = 300 , out0~7 = off ? 7.2 ? supply current ?on? idd (on) vdd=3.3v r ext = 300 , out0~7 = on ? 7.2 ? ma
dm115 b c???? silicon touch technology inc. 8-bit constant current led drivers with 3.3v~5v supply voltage version:a.001 page 7 switching characteristics (ta = 25 c unless otherwise noted) characteristic symbol condition min. typ. max. unit enable-out0 ? 66 132 propagation delay time (?l? to ?h?) clk-sout tp lh ? 16 20 ns enable-out0 ? 81 162 propagation delay time (?h? to ?l?) clk-sout tp hl ? 16 20 ns output current rise time t or ? 30 60 ns output current fall time t of vdd=5.0v vih=vdd vil=gnd rext=630 vl=5.0v rl=150 cl=15pf ? 32 50 ns note: (delay between outputs) the DM115B 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.
dm115 b c???? silicon touch technology inc. 8-bit constant current led drivers with 3.3v~5v supply voltage version:a.001 page 8 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
dm115 b c???? silicon touch technology inc. 8-bit constant current led drivers with 3.3v~5v supply voltage version:a.001 page 9 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
dm115 b c???? silicon touch technology inc. 8-bit constant current led drivers with 3.3v~5v supply voltage version:a.001 page 10 output current vs. external resistor iout 1.3v / rext * 12.5 output current performance vs. output voltage 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 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)
dm115 b c???? silicon touch technology inc. 8-bit constant current led drivers with 3.3v~5v supply voltage version:a.001 page 11 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 im a x (m a) 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
dm115 b c???? silicon touch technology inc. 8-bit constant current led drivers with 3.3v~5v supply voltage version:a.001 page 12 system configuration example [1] output current (i out ) sink current is set by the external resi stor 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
dm115 b c???? silicon touch technology inc. 8-bit constant current led drivers with 3.3v~5v supply voltage version:a.001 page 13 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
dm115 b c???? silicon touch technology inc. 8-bit constant current led drivers with 3.3v~5v supply voltage version:a.001 page 14 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
dm115 b c???? silicon touch technology inc. 8-bit constant current led drivers with 3.3v~5v supply voltage version:a.001 page 15 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
dm115 b c???? silicon touch technology inc. 8-bit constant current led drivers with 3.3v~5v supply voltage version:a.001 page 16 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 en danger 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 su ch intention and manipulation.

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