USER MANUAL
STM 550X / EMSIX
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ENOCEAN MULTI-SENSOR
© 2020 EnOcean | www.enocean.com F-710-017, V1.0
STM 550x / EMSIx User Manual | v1.0 | February 2020 | Page 11/79
2.2.2
Solar cell
The solar cell harvests energy from ambient light. The spectral response of the solar cell is
optimized to harvest energy both from natural and from artificial light. The amount of avail-
able light influences the available power and thereby the possible update rate of STM 550x
as discussed in chapter 2.4.1. The device should therefore be installed such that the amount
of light available to the solar cell is maximized.
2.2.3
Backup battery
STM 550x provides a backup battery interface to mount a CR1632 battery for cases with
insufficient ambient light. The backup battery has to be installed with the positive pole point-
ing upwards (i.e. towards the side of the solar cell).
EnOcean recommends Renata CR1632 due to its low self-discharge and high capacity. Gloves
should be used when installing a backup battery to avoid contamination of the isolation area
between the contacts that could lead to a higher self-discharge.
The backup battery can be removed (ejected) by using a small, non-conductive item (e.g.
wooden toothpick) to push the battery out.
Do not insert any tools into the battery slot or the battery ejection slot! Doing so
could create a short circuit or damage the PCB resulting in permanent damage!
2.2.4
Product label
Each STM 550x module contains a product label with a commissioning QR code. Figure 4
shows the STM 550 product label. STM 550U and STM 550J use the same label structure.
Note the commissioning QR code (described in chapter 6.2) is on the bottom left side.
Figure 4
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STM 550 product label
