DC1836A - Demo Manual

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
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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.
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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
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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
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