User Manual
USER MANUAL V1.05
© 2013 EnOcean | www.enocean.com STM 330 / STM 331 / STM 330C / STM 332U / STM 333U User Manual V1.10 | Page 21/33
STM 330 / STM 331 / STM 330C / STM 332U / STM 333U
Calculations are performed on the basis of electric charges because of the internal linear
voltage regulator of the module. Energy consumption varies with voltage of the energy
storage while consumption of electric charge is constant.
From these values the following typical performance parameters at room temperature have
been calculated:
Wake
cycle
[s]
Transmit
interval
Operation Time
in darkness [h]
when storage
fully charged
Required reload
time [h] at 200
lux within 24 h
for continuous
operation
24 h operation
after 6 h
illumination
at x lux
Illumina-
tion level
in lux for
continuous
operation
Current
in µA
required
for con-
tinuous
operation
1
1
0.5
storage too small
storage too small
5220
130.5
1
10
1.7
storage too small
storage too small
1620
40.5
1
100
2.1
storage too small
storage too small
1250
31.3
10
1
5.1
storage too small
storage too small
540
13.5
10
10
16
21
storage too small
175
4.4
10
100
20
16.8
storage too small
140
3.5
100
1
43
7.8
260
65
1.6
100
10
98
3.6
120
30
0.8
100
100
112
3
100
25
0.6
Assumptions:
Internal storage PAS614L-VL3 (after several days of operation at good illumination
level) with 0.25 F, Umax=3.2 V, Umin=2.2 V, T=25 °C
Consumption: Transmit cycle 100 µC, measurement cycle 30 µC
Pre-installed solar cell ECS 300, operating values 3 V and 5 µA @ 200 lux fluorescent
light
Current proportional to illumination level (not true at very low levels!)
These values are calculated, the accuracy is about +/-20%! The performance varies over
temperature and may be strongly reduced at extreme temperatures or short transmit inter-
vals.