EWT-01

External, Low Power, Long Period Timer with Watchdog Feature

Description

The EWTM module is a low power, ultra long period timer with watchdog feature. It is designed for IoT battery powered applications with long interval duty cycle. It can be implemented as an external reset timer with watchdog function or as system wakeup timer which allows the microcontroller to be placed in ultra low power mode.

The EWTM module features configurable watchdog window. The maximum time interval can be set to up to 24 hours.

Four different time intervals are pre-programmed and can be set by binary combination of 2 pins. For convenience option-select resistors are provided on the PCB (R2 and R3). The configuration is applied after power on and remains unchanged no matter the state of the pins until the next power cycle.

EWTM module can be used for monitoring proper operation of remote IoT systems that transmit data on long time intervals and remote or in-place restart is difficult or impossible.

The PCB is small and flexible. For large scale production EWTM is currently available in a 6-pin SOT-23 chip.

Description

The EWTM module is a low power, ultra long period timer with watchdog feature. It is designed for IoT battery powered applications with long interval duty cycle. It can be implemented as an external reset timer with watchdog function or as system wakeup timer which allows the microcontroller to be placed in ultra low power mode.

The EWTM module features configurable watchdog window. The maximum time interval can be set to up to 24 hours.

Four different time intervals are pre-programmed and can be set by binary combination of 2 pins. For convenience option-select resistors are provided on the PCB (R2 and R3). The configuration is applied after power on and remains unchanged no matter the state of the pins until the next power cycle.

EWTM module can be used for monitoring proper operation of remote IoT systems that transmit data on long time intervals and remote or in-place restart is difficult or impossible.

The PCB is small and flexible. For large scale production EWTM is currently available in a 6-pin SOT-23 chip.

DOWNLOAD DATASHEET
PREORDER

Applications

Remote IoT Systems

Battery Powered Systems

Always On Systems

Long Duty Systems

Non-Time-Critical Systems

Surveillance Systems

Applications

Remote IoT Systems

Battery Powered Systems

Always On Systems

Long Duty Systems

Non-Time-Critical Systems

Surveillance Systems

Features

Applicable for most IoT systems

Selectable Time Intervals from 1.5s to 15h *

Simple Configuration Interface

Wide Temperature Range: -40°C to 125°C

Power Supply Voltage from 1.8 to 5.5V **

Low Current Consumption of 300nA (typ) at 1.8V

2.54mm / 0.1” Breadboard Compatible PCB

Manual Reset

Clear Pulse Width Protection

Small Sized Board 14 x 14 mm / 0.6 x 0.6 inch

Easy To Retrofit On Existing Systems

Watchdog or Wakeup Functionality

Cost Effective

* The time interval can be customized
** The power supply range depends on the module variant

Part NumberPower Supply [V]
EWTM-012.3 - 5.5
EWTM-01L1.8 - 3.6

Functionality

Module Integration

Module Schematic

Reset caused by timeout

EWTM-01 generates reset signal by pulling RESET pin to low for TRESET interval if there is no CLEAR pulse within the programmed interval TPWDT (see Figure 1). The WDT interval is set externally by configuration pins CFG0 and CFG1 or on-board by resistors R2 and R3.

Reset caused by invalid clear pulse

EWTM-01 generates reset signal by pulling RESET pin to low for TRESET interval if the clear pulse is too short TCLRWDT < TCLRWDT(min) or it is too long TCLRWDT > TCLRWDT(max). In the first case it is assumed that there is some accidental glitch in the system and it needs reset while in the second case it is assumed that there is system hang and the pin is set high forever.

Watchdog Interval Configuration

CFG0CFG1R2R2Min*TypMax*
00Position APosition A13 s15 s17 s
10Position BPosition A13 min15 min17 min
01Position APosition B80 min90 min100 min
11Position BPosition B13 h15 h17 h

Pinout Description

PinDescription
VDDPower Supply
GNDGround
RESETReset, low active (open collector)
CLEARClear, high active
CFG1Configuration pin 1
CFG2Configuration pin 2

Top View

PREORDER CAMPAIGN

GOAL:

START DATE:

END DATE:

PRODUCTION DATE:

SHIPPING DATE:

DELIVERY TIME:

10 000 pcs.

15 June 2019

15 July 2019

1 August 2019

1 September 2019

2-4 weeks

PROGRESS:

0

REMAINING:

GOAL:

START:

END:

PRODUCTION:

SHIPPING:

DELIVERY:

10 000 pcs.

15 June 2019

15 July 2019

1 Aug. 2019

1 Sep. 2019

2-4 weeks

PROGRESS:

0

REMAINING:

Why Preorder Campaign?

Our Goal

Our goal is to make the EWT chip available for more people as well as to lower the price by reaching high production volumes. During the campaign you can preorder modules or chips according to your needs. For convenience they are split in packs:

Packages

Modules:

  • 1x – this pack includes only 1 module, enough for a test drive
  • 5x – this pack includes 5 modules, enough to implement it to your self made home automation system
  • 20x – this pack includes 20 modules and allows you to order 3.3V and 5V modules at the same time
  • 100x – this pack includes 100 modules which means you took it seriously and therefore we offer to program custom time intervals acccording to your needs

Chips

  • 5x and 10x – these packs are suitable for a prototyping production – a really good start to explore the chip
  • 50x and 100x – these packs are suitable for pilot production. You can choose multiple options for power supply

Custom Order

  • If you don’t find a pack that covers your needs, feel free to send us a custom order.

Payments and Terms

You have to pay the pack of your choice in advance. All payments will be processed by PayPal. In case we don’t meet our goals we keep the right to fully refund you. You can always withdraw your payment before the production data (15 July 2019), no questions asked. Once we enter production, no refund will be possible.

Your Personal Data

By placing an order you are sending us your personal data. We respect privacy and this data will be stored and used ONLY for the purposes of the campaign.

Return Policy

We will not handle any returns.

Place You Order

What do you want to preorder? A module? A chip? Or you want to place custom order?

  • EWTM - 1x
    • 11.95 11.95€ / module
      • 1 EWT module
      • 3.3/5V variant (one option only) *
      • Free shipping (Worldwide)
      • No custom WDT intervals **

      Choose Power Supply Range


  • EWTM - 5x
    • 24.95 4.99€ / module
      • 5 EWT modules
      • 3.3/5V variant (one option only) *
      • Free shipping (Worldwide)
      • No custom WDT intervals **

      Choose Power Supply Range


  • EWTM - 20x
    • 74.95 3.75€ / module
      • 20 EWT modules
      • 3.3/5V variant (multiple options) *
      • Free shipping (Worldwide)
      • No custom WDT intervals **

      Choose Power Supply Range


  • EWTM - 100x
    • 329.00 3.29€ / module
      • 100 EWT modules
      • 3.3/5V variant (multiple options) *
      • Free shipping (Worldwide)
      • Custom WDT intervals **

      Choose Power Supply Range


  • EWT - 5x
    • 19.95 3.99€ / chip
      • 5 EWT SOT-23 chips
      • 3.3/5V variant (one option only) *
      • Free shipping (Worldwide)
      • No custom WDT intervals **

      Choose Power Supply Range


  • EWT - 10x
    • 29.90 2.99€ / chip
      • 10 EWT SOT-23 chips
      • 3.3/5V variant (one option only) *
      • Free shipping (Worldwide)
      • No custom WDT intervals **

      Choose Power Supply Range


  • EWT - 50x
    • 84.50 1.69€ / chip
      • 50 EWT SOT-23 chips
      • 3.3/5V variant (multiple options) *
      • Free shipping (Worldwide)
      • No custom WDT intervals **

      Choose Power Supply Range


  • EWT - 100x
    • 119.00 1.19€ / chip
      • 100 EWT SOT-23 chips
      • 3.3/5V variant (multiple options) *
      • Free shipping (Worldwide)
      • Custom WDT intervals **

      Choose Power Supply Range


* For orders with qty ≥ 20 the modules/chips combinations of 3.3V and 5.0V can be ordered. After your order, we will contact you to specify the number of 3.3V and 5.0V items.
** For orders with qty ≥ 100 the modules/chips can be programmed with custom watchdog time intervals.