1 dc1836af demo manual dc1836a description LTC2955 pushbutton on/off controller with automatic turn-on demonstration circuit 1836a-a and 1836a-b feature the lt c ? 2955-1 and ltc2995-2, respectively. the LTC2955 is a micropower, pushbutton on/off controller that manages system power by generating a clean enable output from the supply monitor input and the debounced pushbut- ton input. it features an interrupt output that notifies the system of a pushbutton event or low level at the on pin. l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. boar d p hoto when the system receives an int signal, it may use the power kill input to shut off power. if the pushbutton remains pressed for more than the configurable turn-off duration (3s or 32ms), the system power is forced off. design files for this circuit board are available at http://www.linear.com/demo figure 1. proper test equipment setup 1.6v to 36v supply pulse wave generator i/o dc1836a f01
2 dc1836af demo manual dc1836a h ar d ware s etup jum pe r s ett ing s t mr pe ri od : sets the amount of time the user has to hold down the pushbutton in order to cause a shutdown event. it can either be set to 32ms or 3 seconds. o n f un ct i o n : connect to on blocked to block the on pin falling edge from activating system turn-off. connect to on active to allow both the on pin rising and falling edges to activate system turn-on and turn-off, respectively. v in /o n : connects or disconnects vin from on. unless external circuitry has been connected to on, for on to function correctly, this should be set to on. k i ll : ties or separates int from kill. set to tie for au- tomatic shutdown when a long press on the pushbutton is detected. ldo_ in : chooses the input to the onboard lt3060 regula - tor. the user can either set it to vin to have it connected to the vin pin or external in order to have it driven by the ldo_in turret. see the operating principles section. only for led/monitor circuitry. exte rn al co nn ect i o n s signal connections are made via the row of turret posts along the edges of the board. gn d: (3 turrets) these turrets are connected directly to the ground planes. v in : connect a 1.6v to 36v power supply to this turret. o n : can be linked to vin through the vin/on jumper, however, can also be externally connected to a power source. is con- nected directly to the on pin of the LTC2955. if the on function jumper is set to active, this pin can be used to turn on the en pin, or turn off the en pin, depending on if the demo board is populated with an LTC2955-1 or LTC2955-2. pb: this pin is already driven by the pushbutton, however, if needed it can be driven by an external signal to simulate a pushbutton press. ldo_ in : can be used to provide the l t3060 with power when the ldo_in jumper is set to external. ldo_o u t : output from the lt3060. the state of this can also be monitored at d1. d igi t al co nn ect i o n s e n / en: active high (LTC2955-1), or active low (LTC2955- 2) signal. should go active either on a valid on signal or with a debounced pb press. int: goes low on a pushbutton press when en/en is active. can be tied to kill to turn off the part. kill: a low signal at this input will disable en/en. the tmr period jumper sets how long the input signal must be held low. p g d: power good output from the LTC2955. this pin indicates the status of the on pin in order to let the sys- tem differentiate between pushbutton turn-on and supply button turn-on events.
3 dc1836af demo manual dc1836a o perating p rinciples figure 2. pb g oing low for 46.1ms, and e n pulling high, showing a proper turn-on sequence figure 3. pb g oing low for 28.6ms, and en r emaining high, showing t oo short of a pb pulse to properly activate the enable pin figure 4. a turn-on sequence where v in and o n activate e n , as opposed to pb. n otice the 924ms delay between v in g oing high and e n activating connect a 1.6v to 36v power supply to vin. if vin is less than 5.5v, set the ldo_in jumper to external and connect a 5.5v to 36v supply to the ldo_in turret. the LTC2955 will still operate with no power applied to ldo_in, but monitor leds will not function. on the dc1836a, a pushbutton switch shorts the pb pin to ground which in turn sets the en pin low (dc1836a-b) or the en pin high (dc1836a-a). shorting pb to ground a second time and holding (duration depending on the tmr_period jumper) subsequently de-asserts the en/en pin. the en/en pin is unobtrusively monitored by the lt6700 comparator. an internal 512ms timer blanks (ignores) the kill signal during system power-up. this allows sufficient time for the dc/dc converter and a controller to perform power- up tasks. a high to low transition on pb starts the turn-off sequence. in order to assert int low, pb must stay low continuously for 32ms. users can also force the system to power down by holding the pushbutton down for a long period; this period is set using the tmr_period jumper on the board. after the en/en pin has been released, the LTC2955 starts a one second lockout time. during this lockout time, the pb and on inputs are ignoredthis is meant to allow the voltage regulator to turn off and for its output to decay to 0v. dc1836a f04 en pb v in 0n dc1836a f03 pb en pb en dc1836a f02
4 dc1836af demo manual dc1836a p arts l ist i te m qty r efe r e n ce pa r t desc ri p t i o n m a nu f act ur e r /p a r t num be r r equired circuit components 1 0 c1 cap., opt, 1206 2 1 c2 cap., x7r, 0.1f, 50v, 10%, 0805 avx, 08055c104kat2a 3 0 c3, c7 cap., opt, 0603 4 1 c4 cap., x5r, 0.47f, 10v, 10%, 0603 taiyo yuden, lmk107bj474ka 5 1 c5 cap., x5r, 1f, 10v, 10%, 0603 avx, 0603zd105kat2a 6 1 c6 cap., x7r 10nf 10v, 10%, 0603 avx, 0603zc103kat2a 7 1 c8 cap., x5r, 2.2f, 10v, 10%, 0603 murata, grm188r61a225k 8 1 c9 cap., x5r, 0.1f, 10v, 10%, 0603 avx, 0603zd104kat2a 9 13 e1-e13 tp, turret, 0.064", pad120-064 mill-max, 2308-2-00-80-00-00-07-0 10 5 jp1-jp5 hd13-079 samtec, tmm103-02-l-s 11 5 xjp1-xjp5 shunt samtec, 2sn-bk-g 12 2 d1, d2 led, green panasonic, ln1351-c-tr 13 1 d3 led, red panasonic, ln1251-c-tr 14 1 d4 led, amber panasonic, ln1451-c-tr 15 1 r1 res., chip, 1k, 1/10w, 1%, 0603 vishay, crcw06031k00fkea 16 2 r2, r4 res., chip, 200k, 1/16w, 1%, 0402 vishay, crcw0402200kfked 17 1 r3 res., chip, 5.1k, 1/16w, 1%, 0402 vishay, crcw04025k10fked 18 0 r5, r7 res., opt., 0402 19 1 r8 res., chip, 100k, 1/16w, 1%, 0402 vishay, crcw0402100kfked 20 1 r9 res., chip, 845k, 1/16w, 1%, 0402 vishay, crcw0402845kfked 21 1 r10 res., chip, 115k, 1/16w, 1%, 0402 vishay, crcw0402115kfked 22 4 r11, r12, r13, r14 res., chip, 475, 1/16w, 1%, 0402 vishay, crcw0402475rfked 23 2 r6, r19 res., chip, 10k, 1/16w, 1%, 0402 vishay, crcw040210kfked 24 1 sw1 switch, pushbutton panasonic, evqpjs05k 25 1 u3 i.c., lt3060ets8, ts8 linear technology, lt3060ets8 26 2 u6, u7 i.c., lt6700cs6-1, sot23-6 linear technology, lt6700cs6-1 27 2 stencil top and bottom stencil, dc1836a dc1836a-a r equired circuit components 1 1 u1 i.c., LTC2955iddb-1, dfn10ddb linear technology, LTC2955iddb-1 2 2 r15, r16 res., chip, 100k, 1/16w, 1%, 0402 vishay, crcw0402100kfked 3 0 r17, r18 res., opt., 0402 4 1 fab, printed circuit board demo circuit 1836a dc1836a-b r equired circuit components 1 1 u1 i.c., LTC2955iddb-2, dfn10ddb linear technology, LTC2955iddb-2 2 2 r17, r18 res., chip, 100k, 1/16w, 1%, 0402 vishay, crcw0402100kfked 3 0 r15, r16 res., opt., 0402 4 1 fab, printed circuit board demo circuit 1836a
5 dc1836af demo manual dc1836a information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa - tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. figure 5. pushbutton on/off controller with p i nterrupt 5 5 4 4 3 3 2 2 1 1 d d c c b b a a note: unless otherwise specified all capacitors are in microfarads, 0603. 1. all resistors are in ohms, 0402. -a LTC2955iddb-1 u1 r15,r16 -b assy 100k * opt r17,r18 en LTC2955iddb-2 100k opt install for enable (true) install for enable # ldo_out pgd int en / en * e6 en vin en/en en/en ldo_out revision history description date approved eco rev vladimir o. production 4 04-13-12 __ revision history description date approved eco rev vladimir o. production 4 04-13-12 __ revision history description date approved eco rev vladimir o. production 4 04-13-12 __ size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications ; however, it remains the customer's responsibility t o verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circu it performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology an d schematic supplied for use with linear technology parts. scale = none www.linear.com 4 friday, april 13, 2012 11 push button on / off controller with up interrupt lt vladimir o. n/a LTC2955iddb-1 / -2 demo circuit 1836a size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications ; however, it remains the customer's responsibility t o verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circu it performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology an d schematic supplied for use with linear technology parts. scale = none www.linear.com 4 friday, april 13, 2012 11 push button on / off controller with up interrupt lt vladimir o. n/a LTC2955iddb-1 / -2 demo circuit 1836a size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications ; however, it remains the customer's responsibility t o verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circu it performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology an d schematic supplied for use with linear technology parts. scale = none www.linear.com 4 friday, april 13, 2012 11 push button on / off controller with up interrupt lt vladimir o. n/a LTC2955iddb-1 / -2 demo circuit 1836a u3 lt3060ets8 u3 lt3060ets8 in 5 ref/byp 8 shdn 1 gnd1 2 gnd2 3 gnd3 4 adj 7 out 6 r2 200k r2 200k jp2 tmr period 3.0s 32ms jp2 tmr period 3.0s 32ms 1 3 2 jp5 vin / on con dis jp5 vin / on con dis 1 3 2 c5 1uf c5 1uf r14 475 r14 475 r9 845k r9 845k r3 5.1k r3 5.1k r7 opt r7 opt u1 * u1 * int 1 pgd 2 en/en 3 sel 7 vin 4 gnd 6 kill 9 on 10 gnd 11 pb 5 tmr 8 + - 400mv - + u7 lt6700cs6-1 + - 400mv - + u7 lt6700cs6-1 -inb 4 outa 1 +ina 3 outb 6 gnd 2 vs 5 e10 ldo_in e10 ldo_in jp1 on function on active on blocked jp1 on function on active on blocked 1 3 2 sw1 evqpjs05k no_pb sw1 evqpjs05k no_pb 1 2 jp3 kill tie separate jp3 kill tie separate 1 3 2 e1 1.6v - 36v vin e1 1.6v - 36v vin d4 amber d4 amber 2 1 c8 2.2uf c8 2.2uf c6 10nf c6 10nf r12 475 r12 475 r10 115k r10 115k e12 gnd e12 gnd + - 400mv - + u6 lt6700cs6-1 + - 400mv - + u6 lt6700cs6-1 -inb 4 outa 1 +ina 3 outb 6 gnd 2 vs 5 r8 100k r8 100k e5 ldo_out e5 ldo_out r16 * r16 * c9 0.1uf c9 0.1uf c7 opt c7 opt r17 * r17 * e4 gnd e4 gnd c1 opt 1206 c1 opt 1206 r5 opt r5 opt r1 1k 0603 r1 1k 0603 r18 * r18 * d2 green d2 green 2 1 r11 475 r11 475 e8 pgd e8 pgd r4 200k r4 200k e7 int e7 int e9 kill e9 kill e2 on e2 on e3 pb e3 pb e11 vin e11 vin e6 e6 r13 475 r13 475 jp4 ldo_in vin external jp4 ldo_in vin external 1 3 2 r19 10k r19 10k d1 green d1 green 2 1 e13 gnd e13 gnd r15 * r15 * r6 10k r6 10k d3 red d3 red 2 1 c2 0.1uf 0805 c2 0.1uf 0805 c3 opt c3 opt c4 0.47uf c4 0.47uf s chematic diagram
6 dc1836af demo manual dc1836a linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com ? linear technology corporation 2012 lt 0612 ? printed in usa demonstration board important notice linear technology corporation (ltc) provides the enclosed product(s) under the following as i s conditions: this demonstration board (demo board) kit being sold or provided by linear technology is intended for use for e ngin ee ring develop m e n t o r eval u a t i o n p ur poses o n l y and is not provided by ltc for commercial use. as such, the demo board herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. as a prototype, this product does not fall within the scope of the european union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. if this evaluation kit does not meet the specifications recited in the demo board manual the kit may be returned within 30 days from the date of delivery for a full refund. the foregoing warranty is the exclusive warranty made by the seller to buyer and is in lieu of all other warranties, expressed, implied, or statutory, including any warranty of merchantability or fitness for any particular purpose. except to the extent of this indemnity, neither party shall be liable to the other for any indirect, special, incidental, or consequential damages. the user assumes all responsibility and liability for proper and safe handling of the goods. further, the user releases ltc from all claims arising from the handling or use of the goods. due to the open construction of the product, it is the users responsibility to take any and all appropriate precautions with regard to electrostatic discharge. also be aware that the products herein may not be regulatory compliant or agency certified (fcc, ul, ce, etc.). no license is granted under any patent right or other intellectual property whatsoeve r. ltc assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. ltc currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. please read the de m o boa r d manual prior to handling the product . persons handling this product must have electronics training and observe good laboratory practice standards. common sense is encouraged. this notice contains important safety information about temperatures and voltages. for further safety concerns, please contact a ltc applica- tion engineer. mailing address: linear technology 1630 mccarthy blvd. milpitas, ca 95035 copyright ? 2004, linear technology corporation
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