DATA SHEET

© EnOcean | www.enocean.com

Datasheet - Subject to modifications | Oct 2019

Features overview

Antenna

50 Ohm helix antenna (on-board)

Radio Frequency / Data Rate

STM 350

868.3 MHz ASK / 125 kbps

STM 350U

902.875 FSK / 125 kbps

Radiated Output Power (typ.)

+5 dBm

On-board Power Supply

Pre-installed solar cell

Auxiliary Power Supply

Option for backup battery (3V)

Operation time in darkness @ 25°C

min. 10 days, if energy storage fully charged 1)

Sensor performance

Temperature: ±0.5 K across entire range

Humidity: ±3.0 % r.h. between 20 … 80 % r.h.

Measurement interval

Approximately once every 100 s

Transmission interval

Every 7 … 14 measurements (affected at random)

Immediate transmission in case of significant change

EnOcean Equipment Profile (EEP)

A5-04-03

SIGNAL 0x06 (Energy Level Reporting)

SIGNAL 0x0E (Entering Transport Mode)

Operating and Storage temperature

Absolute Maximum: -20 °C … +60 °C

Recommended1: +10 °C…+30 °C

Shelf life (in absolute darkness)

36 months after delivery1

36 months after delivery2)

Operating and storage humidity

Maximum: 0% … 93% r.h., non-condensing

Recommended: < 60% r.h.

Dimensions

50±0.2 x 16±0.3 x 10mm

1 Energy storage performance degrades over life time, especially if energy storage is long time

exposed to very high temperatures. High temperatures will accelerate aging. Very low temperature

will temporary reduce capacity of energy store and this leads to considerable shorter dark time operation.

2 Deep discharge of the energy storage leads to degradation of performance.

Therefore products have to be taken into operation after 36 months.

STM 350 / STM 350U

Dolphin Temperature and

Humidity Sensor Module

Dolphin STM 350 modules enable the reali-

zation of energy harvesting temperature and

humidity sensors that communicate wire-

lessly using the EnOcean radio standard.

They require no external components and

provide an on-board a calibrated tempera-

ture and humidity sensor.

STM 350 modules wake up at a rate of approx.

once every 100 seconds to read the status of the

integrated temperature and humidity sensor.

If there is a significant change in measured tem-

perature or humidity versus the last reported

values then a radio telegram will be transmitted

immediately. In case of no relevant change, a

redundant retransmission signal (heartbeat) is

sent after 15 minutes to announce the current

values.

Power is provided to STM 350 by means of a

small pre-installed solar cell which works in con-

junction with an integrated energy storage ele-

ment in order to ensure operation in periods

without ambient light.

STM 350 additionally provides the option to con-

nect an external 3 V backup battery to enable

operation with little or no available light.

TYPE

STM 350

STM 350U

ORDERING CODE

S3001-D350

S3051-D350