Linear Technology DC1836A Quick setup guide

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.

BoarD photo

When the system receives an INT signal, it may use the

power kill input to shut offpower.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

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dc1836af

DEMO MANUAL DC1836A

harDware setup

JUMPER SETTINGS

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.

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

edgesto activatesystem turn-onand turn-off,respectively.

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 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.

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:CanbelinkedtoVINthroughtheVIN/ONjumper,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 LTC2955-1or 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.

DIGITAL CONNECTIONS

EN/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.

PGD: 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.

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dc1836af

DEMO MANUAL DC1836A

operating principles

Figure 2. PB Going Low For 46.1ms, and EN Pulling High,

Showing a Proper Turn-On Sequence

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

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

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 powerapplied 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 ignored—this is meant to allow the

voltage regulator to turn off andfor its output to decay to0V.

dc1836a F04

VIN

dc1836a F03

dc1836a F02

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dc1836af

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

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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 µP Interrupt

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

ENLTC2955IDDB-2 100K

OPT

INSTALL FOR ENABLE (TRUE)

INSTALL FOR ENABLE #

LDO_OUT

PGD INT

EN / EN

VIN

EN/EN

LDO_OUT

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

VLADIMIR O. PRODUCTION404-13-12

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

VLADIMIR O. PRODUCTION404-13-12

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

VLADIMIR O. PRODUCTION404-13-12

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 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.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Friday, April 13, 2012

PUSH BUTTON ON / OFF CONTROLLER WITH uP INTERRUPT

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 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.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Friday, April 13, 2012

PUSH BUTTON ON / OFF CONTROLLER WITH uP INTERRUPT

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 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.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Friday, April 13, 2012

PUSH BUTTON ON / OFF CONTROLLER WITH uP INTERRUPT

VLADIMIR O.

N/A

LTC2955IDDB-1 / -2

DEMO CIRCUIT 1836A

LT3060ETS8

REF/BYP 8

SHDN

GND1

GND2

GND3

ADJ 7

OUT 6

200K

JP2

TMR PERIOD

3.0S

32MS

JP2

TMR PERIOD

3.0S

32MS

JP5

VIN / ON

CON

DIS JP5

VIN / ON

CON

DIS

1uF

R14

475

R14

475

845K

5.1K

OPT

INT 1

PGD 2

EN/EN 3

SEL

VIN

GND 6

KILL 9

GND

TMR

400mV

LT6700CS6-1

400mV

LT6700CS6-1

-INB

OUTA 1

+INA

OUTB 6

GND

2VS 5

E10

LDO_IN

E10

LDO_IN

JP1

ON FUNCTION

ON ACTIVE

ON BLOCKED

JP1

ON FUNCTION

ON ACTIVE

ON BLOCKED

SW1

EVQPJS05KNO_PB SW1

EVQPJS05KNO_PB

1 2

JP3

KILL

TIE

SEPARATE

JP3

KILL

TIE

SEPARATE

1.6V - 36V

VIN

1.6V - 36V

VIN

AMBER

2 1

2.2uF

10nF

R12

475

R12

475

R10

115K

R10

115K

E12

GND

E12

GND

400mV

LT6700CS6-1

400mV

LT6700CS6-1

-INB

OUTA 1

+INA

OUTB 6

GND

2VS 5

100K

LDO_OUT

R16

0.1uF

OPT

R17

GND

OPT

1206

OPT

1206 R5

OPT

0603

R18

GREEN

2 1

R11

475

R11

475

PGD

200K

INT

KILL

E11

VIN

E11

VIN

E6E6

R13

475

R13

475

JP4

LDO_IN

VIN

EXTERNAL

JP4

LDO_IN

VIN

EXTERNAL

R19

10K

R19

10K

GREEN

2 1

E13

GND

E13

GND

R15

10K

RED

2 1

0.1uF

0805

0.1uF

0805

OPT

0.47uF

schematic Diagram

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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 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 applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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