Available variants frequency, antenna, learn button
STM 330: 868.3 MHz, whip, back button
STM 331: 868.3 MHz, helical, back button
STM 331U: 902.875 MHz, helical, back button
STM 332U: 902.875 MHz, whip, side button
STM 333U: 902.875 MHz, helical, side button
Data rate/Modulation type
125 kbps / ASK (868 MHz), FSK (902 MHz)
Radiated output power
STM 330: +8 dBm1 (EIRP) ± 2.5 dB2
STM 331: +5 dBm (EIRP) ± 2.5 dB
STM 331U: +99 dBμV/m ± 2 dB
STM 332U: +101 dBμV/m ± 2 dB
STM 333U: +99 dBμV/m ± 2 dB
Power supply @ VDD
Pre-installed solar cell
Operation time in darkness @ 25°C
min. 10 days, if energy storage fully charged3
Operation start up time with empty energy store
typ. <2.5 min @ 400 lux / 25 °C incandescent or fluorescent light
Input channels
Internal: temperature sensor, LRN button
External: occupancy button, set point dial, HSM 100
Temperature sensor
Measurement range 0-40 °C, resolution 0.16 K
Accuracy typ. ±0.5 K between 17 °C and 27 °C
typ. ±1 K between 0 °C and 40 °C
EnOcean Equipment Profiles
configurable EEPs: A5-02-05 (default), A5-02-30, A5-10-05, A5-10-03
and with HSM 100: A5-04-01, A5-10-10, A5-10-12
SIGNAL 0x0E (Entering Transport Mode)
Connector
20 pins, grid 1.27 mm, □ 0.4 mm
Radio regulations
RED (EU): STM 330 / STM331
FCC (US) / ISED (CA): STM 331U / STM 332U / 333U