STM550U

STM550U is a multisensor module that enables the realization of energy harvesting wireless sensors communicating according to EnOcean Alliance radio standard. Key applications are wall-mounted or equipment-mounted sensor solutions for the measurement of temperature, humidity, illumination or acceleration / orientation. STM 550U integrates dedicated sensors for temperature, humidity, illumination, acceleration and magnet contact. This sensor measure and transmit the current status every 60 seconds. STM 550U will immediately wake-up and transmit an update if an acceleration event occurs (e.g. due to being moved or shaken) after a period without such change. STM 550U contains an integrated solar cell optimized to generate the required energy based on available ambient lighting. Under typical indoor lighting scenarios (200 lux for 6 hours per day) they operate fully self-supplied. For use cases with insufficient available light, it is possible to mount a dedicated backup battery.

• Transmission frequency/data rate is 902.875MHz/125kbps and +99dbµV transmission power
• Transmission range (for guidance only) typ. 200m free field / 30m indoor environment
• Temperature measurement range /accuracy range from -20°C to +60°C / ±0.3K
• Humidity measurement range/accuracy range from 0 to 100% R.H../±3% R.H.
• Illumination measurement range/accuracy from 0 to 65000Lux /±10%
• Update rate (excl. random offset) of every 60seconds (configurable via NFC ISO 14443)
• Operating time in darkness (at 25°C) 4 days (after full charge)
• Operating temperature /humidity range from -5°C to +45°/0 to 90% R.H.. (non-condensing)
• Dimension is 40mm x 40mm x 13mm
• Delivered as module in PTM 21x form factor for integration into OEM customer designs