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Linear Technology LTC2956 Manual

Wake-up timer with pushbutton control
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Description
Demonstration circuits 2254A-A and 2254A-B feature the
LTC2956-1 and LTC2956-2, respectively. The
is a micropower, wide input voltage range, configurable
wake-up timer with pushbutton control. It periodically
wakes up and turns on a connected system to perform
tasks like monitoring temperature or capturing images.
After completing the task, the LTC2956 turns the system
off to conserve power. The wake-up timer period can be
adjusted from 250ms to 39 days.
BoarD photo
+
PSU
–
DEMO MANUAL DC2254A
with Pushbutton Control
The DC2254A allows easy access to all the pins necessary
LTC
2956
to configure the device. Onboard jumpers, and an 8-pin
®
DIP switch provide a range of value options, to set the
wake-up timer, wake-up timer period and long power down
time. Turrets are also present, allowing direct access to all
the pins present on the LTC2956 to allow easy interfacing
with a system with arbitrary requirements.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2254A
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. Test Equipment Setup
LTC2956
Wake-Up Timer
I/O TO
SCOPE OR
µP
dc2254af
1

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Summary of Contents for Linear Technology LTC2956

  • Page 1 Design files for this circuit board are available at adjusted from 250ms to 39 days. http://www.linear.com/demo/DC2254A 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 –...
  • Page 2 250ms and 1s. See Applications LDO_IN: Can be used to provide the LT3060 with power Information in the LTC2956 data sheet and replace R11 when the LDO_IN jumper is set to EXT. and/or R12 if another time is desired.
  • Page 3 Connect a 1.6V to 36V power supply to VIN. If VIN is On power up, the LTC2956 can be initialized to either of less than 5.5V then set the LDO_IN jumper to EXTERNAL these two modes. SW1 provides 8 different options to and connect a 5.5V to 35V supply to the LDO_IN turret.

  • Page 4: Operating Principles

    DEMO MANUAL DC2254A operatinG principLes PBOUT 250ms TIME PERIOD 20ms AWAKE TIME Figure 2. LTC2956-1, Awake Time Set to 20ms, Time Period Set to 250ms dc2254af...
  • Page 5 DEMO MANUAL DC2254A operatinG principLes PBOUT ONALERT Figure 3. LTC2956-1, Awake Time Set to 20ms, Time Period Set to 250ms, Showing Proper Turn On Sequence with ONALERT Signal dc2254af...
  • Page 6 DEMO MANUAL DC2254A operatinG principLes PBOUT 1 SEC OFFALERT ONALERT Figure 4. LTC2956-1, Awake Time Set to 20ms, Time Period Set to 250ms, Showing Proper Shutdown Sequence with OFFALERT Signal dc2254af...

  • Page 7: Parts List

    DEMO MANUAL DC2254A parts List ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP., X7R, 1500pF, 25V, 10%, 0603 AVX, 06033C152KAT2A CAP., X7R, 0.1µF, 50V, 5%, 0603 AVX, 06035C104JAT2A CAP., 0603 CAP., X7R, 2.2µF, 10V, 20%, 0603 MURATA, GRM188R71A225ME15D CAP., X5R, 1µF, 50V, 10%, 0603 NIC, NMC0603X5R105K50TRPF Cap., X7R, 0.01µF, 10V, 10%, 0603...
  • Page 8 DEMO MANUAL DC2254A parts List ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC2254A-A Required Circuit Components DC2254A1-GENERAL BOM MOSFET, N-CH, SOT23 FAIRCHILD SEMI., 2N7002 RES., 0402 RES., CHIP, 430, 1/16W 5%, 0402 VISHAY, CRCW0402430RJNED I.C., QFN12UD-3X3 LINEAR TECH., LTC2956IUD-1 DC2254A-B Required Circuit Components DC2254A1-GENERAL BOM MOSFET, N-CH, SOT23 RES., CHIP, 430, 1/16W, 5%, 0402...

  • Page 9: 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 10 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.
  • Page 11 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Analog Devices Inc. DC2254A-B DC2254A-A...