EWT-01
External, Low Power, Long Period Timer with Watchdog FeatureThe 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
Applications
Features
* The time interval can be customized
** The power supply range depends on the module variant
| Part Number | Power Supply [V] |
|---|---|
| EWTM-01 | 2.3 - 5.5 |
| EWTM-01L | 1.8 - 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
| CFG0 | CFG1 | R2 | R2 | Min* | Typ | Max* |
|---|---|---|---|---|---|---|
| 0 | 0 | Position A | Position A | 13 s | 15 s | 17 s |
| 1 | 0 | Position B | Position A | 13 min | 15 min | 17 min |
| 0 | 1 | Position A | Position B | 80 min | 90 min | 100 min |
| 1 | 1 | Position B | Position B | 13 h | 15 h | 17 h |
Pinout Description
| Pin | Description |
|---|---|
| VDD | Power Supply |
| GND | Ground |
| RESET | Reset, low active (open collector) |
| CLEAR | Clear, high active |
| CFG1 | Configuration pin 1 |
| CFG2 | Configuration 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:
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:
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?
* 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.