The schematic comfortably fits onto one side of A4 and features a handful of low cost but high-quality components.
The cuplTag has a tiny average power consumption of ~420 nA @ 3V (21°C)
A CR1025 battery has a typical charge capacity of 30 mAh (discharging from 3V to 2V). This means the battery life is 30 mAh / 420 nA = 8.15 years.
The cuplTag is only 24mm x 28.5mm x 1.6mm. Metal (e.g. copper pours) should be kept at least 5mm from the tag in order to preserve its read range.
Using our work as a template, it is straightforward to integrate cuplTag into a motherboard of your own design, with a battery and enclosure suited to your needs. In return for a support contract, we are happy to advise further.
When buying official cupl products, you can be assured that code, design files and documentation will be available. Consumers are becoming less tolerant of single-use black boxes.
Openness is strength. Our designs will benefit from community engagement and peer-review.
Code can be updated over UART, using the MSP430 BSL. This is invoked by sending the <b> command.
Spy-Bi-Wire (JTAG) is an alternative, if a programmer is available.
Reprogramming is not always feasible. The tag may be conformally coated to protect it from moisture ingress. cuplTag supports reconfiguration over NFC – another path to re-usability.