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Linear Technology DC1836A Demo Manual

Ltc2955 pushbutton on/off controller with automatic turn-on
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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 pushbut-
ton input. It features an interrupt output that notifies the
system of a pushbutton event or low level at the ON pin.
BoarD photo
1.6V TO 36V SUPPLY
PULSE WAVE GENERATOR
Arrow.com.
Downloaded from
DEMO MANUAL DC1836A
Pushbutton On/Off Controller
with Automatic Turn-On
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.
Figure 1. Proper Test Equipment Setup
LTC2955
I/O
dc1836a F01
dc1836af
1

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Summary of Contents for Linear Technology DC1836A

  • Page 1 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.

  • Page 2: Hardware Setup

    DEMO MANUAL DC1836A harDware setup JumPEr SETTingS DigiTAL COnnECTiOnS Tmr PEriOD: Sets the amount of time the user has to En/EN: Active high (LTC2955-1), or active low (LTC2955- hold down the pushbutton in order to cause a shutdown 2) signal. Should go active either on a valid ON signal or event.

  • Page 3: Operating Principles

    On the DC1836A, a pushbutton switch shorts the PB pin In order to assert INT low, PB must stay low continuously to ground which in turn sets the EN pin low (DC1836A-B) for 32ms. Users can also force the system to power down or the EN pin high (DC1836A-A).

  • Page 4: Parts List

    I.C., LT3060ETS8, TS8 LINEAR TECHNOLOGY, LT3060ETS8 U6, U7 I.C., LT6700CS6-1, SOT23-6 LINEAR TECHNOLOGY, LT6700CS6-1 STENCIL TOP AND BOTTOM STENCIL, DC1836A DC1836A-A required Circuit Components I.C., LTC2955IDDB-1, DFN10DDB LINEAR TECHNOLOGY, LTC2955IDDB-1 R15, R16 Res., Chip, 100k, 1/16W, 1%, 0402 VISHAY, CRCW0402100KFKED R17, R18 Res., OPT., 0402...

  • Page 5: Schematic Diagram

    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.
  • Page 6 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.

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