DC1836A-B

DEMO MANUAL DC1836A LTC2955 Pushbutton On/Off Controller with Automatic Turn-On Description Demonstration circuit 1836A-A and 1836A-B feature the LTC®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 pushbutton input. It features an interrupt output that notifies the system of a pushbutton event or low level at the ON pin. 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 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. Board Photo 1.6V TO 36V SUPPLY PULSE WAVE GENERATOR I/O dc1836a F01 Figure 1. Proper Test Equipment Setup dc1836af 1 DEMO MANUAL DC1836A Hardware Setup Jumper Settings DIGITAL CONNECTIONS TMR PERIOD: 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. EN/EN: Active high (LTC2955-1), or active low (LTC29552) signal. Should go active either on a valid ON signal or with a debounced PB press. ON FUNCTION: 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. INT: Goes low on a pushbutton press when EN/EN is active. Can be tied to KILL to turn off the part. VIN/ON: 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. KILL: Ties or separates INT from KILL. Set to TIE for automatic shutdown when a long press on the pushbutton is detected. 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. PGD: Power good output from the LTC2955. This pin indicates the status of the ON pin in order to let the system differentiate between pushbutton turn-on and supply button turn-on events. LDO_IN: Chooses the input to the onboard LT3060 regulator. 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. EXTERNAL CONNECTIONS Signal connections are made via the row of turret posts along the edges of the board. GND: (3 turrets) These turrets are connected directly to the ground planes. VIN: Connect a 1.6V to 36V power supply to this turret. ON: Can be linked to VIN through the VIN/ON jumper, however, can also be externally connected to a power source. Is connected 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 LT3060 with power when the LDO_IN jumper is set to external. LDO_OUT: Output from the LT3060. The state of this can also be monitored at D1. dc1836af 2 DEMO MANUAL DC1836A Operating Principles 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. PB 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 powerup 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 ignored—this is meant to allow the voltage regulator to turn off and for its output to decay to 0V. PB EN EN dc1836a F02 Figure 2. PB Going Low For 46.1ms, and EN Pulling High, Showing a Proper Turn-On Sequence dc1836a F03 Figure 3. PB Going Low for 28.6ms, and EN Remaining High, Showing Too Short of a PB Pulse to Properly Activate the Enable Pin VIN EN 0N PB dc1836a F04 Figure 4. A Turn-On Sequence Where VIN and ON Activate EN, as Opposed to PB. Notice the 924ms Delay Between VIN Going High and EN Activating dc1836af 3 DEMO MANUAL DC1836A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 0 C1 CAP., OPT, 1206 2 1 C2 CAP., X7R, 0.1µF, 50V, 10%, 0805 AVX, 08055C104KAT2A 3 0 C3, C7 CAP., OPT, 0603 4 1 C4 CAP., X5R, 0.47µF, 10V, 10%, 0603 TAIYO YUDEN, LMK107BJ474KA 5 1 C5 CAP., X5R, 1µF, 10V, 10%, 0603 AVX, 0603ZD105KAT2A 6 1 C6 CAP., X7R 10nF 10V, 10%, 0603 AVX, 0603ZC103KAT2A 7 1 C8 CAP., X5R, 2.2µF, 10V, 10%, 0603 MURATA, GRM188R61A225K 8 1 C9 CAP., X5R, 0.1µF, 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 HD1×3-079 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 Required 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 Required 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 dc1836af 4 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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. A B C D VIN * EXTERNAL E4 E10 E3 E2 E13 LTC2955IDDB-2 EN ADJ OUT GND1 GND2 GND3 REF/BYP SHDN IN OPT 100K 100K OPT R15,R16 R17,R18 2 3 4 1 5 NO_PB 8 7 6 5 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPACITORS ARE IN MICROFARADS, 0603. 4 C6 10nF C7 OPT R4 200K SW1 EVQPJS05K C3 OPT JP1 ON FUNCTION 1 2 3 ON ACTIVE ON BLOCKED U3 LT3060ETS8 5.1K R3 200K R2 C1 OPT 1206 NOTE: UNLESS OTHERWISE SPECIFIED -B EN E6 C5 1uF VIN VIN LDO_IN JP4 VIN / ON 1 CON 2 3 DIS JP5 U1 ASSY -A LTC2955IDDB-1 GND LDO_IN PB ON GND E1 1 2 3 2 1 1.6V - 36V C8 2.2uF C4 0.47uF TMR PB ON SEL VIN EN/EN D1 GREEN GND KILL PGD INT EN/EN 6 9 2 1 3 R18 * * * R16 R17 * R15 3 4 3 4 1 2 3 + + THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. D3 RED INT R13 475 DESCRIPTION OUTB LT 2 SCALE = NONE APP ENG. VLADIMIR O. PCB DES. APPROVALS E12 E5 E9 E8 E7 E6 E11 GND LDO_OUT KILL PGD * INT VIN DATE 04-13-12 DATE: N/A SIZE 1 SHEET 1 LTC2955IDDB-1 / -2 DEMO CIRCUIT 1836A Friday, April 13, 2012 IC NO. OF 1 4 REV. PUSH BUTTON ON / OFF CONTROLLER WITH uP INTERRUPT TECHNOLOGY APPROVED VLADIMIR O. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only D2 GREEN EN / EN R14 475 PRODUCTION 6 TITLE: SCHEMATIC D4 AMBER 4 REV 1 REVISION HISTORY U7 LT6700CS6-1 1 400mV 1 OUTA +INA + -INB LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 3 OUTB R8 100K __ ECO PGD R12 475 R7 OPT 6 LDO_OUT R6 10K 2 U6 LT6700CS6-1 EN/EN 400mV OUTA + +INA -INB 0.1uF C9 CUSTOMER NOTICE JP3 KILL R5 OPT TIE SEPARATE INSTALL FOR ENABLE (TRUE) 11 GND * INSTALL FOR ENABLE # LDO_OUT R11 475 8 5 10 7 4 U1 Figure 5. Pushbutton On/Off Controller with µP Interrupt R10 115K R9 845K JP2 TMR PERIOD 3 2 1 3.0S 32MS R19 10K C2 0.1uF 0805 R1 1K 0603 1 2 3 1 2 4 5 VS GND 2 5 VS GND 2 1 2 1 2 5 A B C D DEMO MANUAL DC1836A Schematic Diagram dc1836af 5 DEMO MANUAL DC1836A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY 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 user’s 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 whatsoever. 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 DEMO BOARD 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 application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation dc1836af 6 Linear Technology Corporation LT 0612 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com  LINEAR TECHNOLOGY CORPORATION 2012