EnOcean GmbH STM311C Manual Do Utilizador
USER MANUAL V0.6
© 2010 EnOcean | www.enocean.com
STM 31x / STM 31xC User Manual V0.6 | Page 4/28
STM 31X / STM 31XC
1
GENERAL DESCRIPTION
1.1 Basic functionality
The extremely power saving RF transmitter module
STM 31x of EnOcean enables the realization of a wide
STM 31x of EnOcean enables the realization of a wide
range of wireless and maintenance free sensors such
as temperature sensors, humidity sensors, or room
operating panels.
as temperature sensors, humidity sensors, or room
operating panels.
Power supply is provided by a small solar cell, an ex-
ternal energy harvester, or an external 3V battery. An
energy storage is installed to bridge periods with no
supply from the energy harvester. The module pro-
energy storage is installed to bridge periods with no
supply from the energy harvester. The module pro-
vides a user configurable cyclic wake up.
After wake up the external sensors are supplied and
after a configurable delay (default 2ms) the internal microcontroller reads the status of the
After wake up the external sensors are supplied and
after a configurable delay (default 2ms) the internal microcontroller reads the status of the
connected sensors. A radio telegram will be transmitted in case of a change of any digital
input value compared to the last sending or in case of a significant change of measured
analogue values.
input value compared to the last sending or in case of a significant change of measured
analogue values.
In case of no relevant input change a redundant retransmission signal is sent after a user
configurable number of wake-ups to announce all current values. In addition to the cyclic
configurable number of wake-ups to announce all current values. In addition to the cyclic
wake-up, a wake up can be triggered externally using a wake input or the internal LRN but-
ton.
ton.
Features with built-in firmware
Pre-installed solar cell (except STM 312/STM 312C)
On-board energy storage and charging circuit
On-board LRN button
On-board TX indicator LED
20 pin connector for external sensors
3 A/D converter inputs
3 digital inputs
Configurable wake-up and transmission cycle
Wake-up via Wake pins or LRN button
Product variants
STM 310/310C: Variant including solar cell and whip antenna
STM 311/311C: Variant including solar cell and helical antenna
STM 312/312C: Variant including whip antenna but no pre-installed solar cell
Features accessible via API
Using the Dolphin API library it is possible to write custom firmware for the module.
The API provides:
The API provides:
Integrated 16 MHz 8051 CPU with 32 KB FLASH and 2 kB SRAM
Various power down and sleep modes down to typ. 0.2 µA current consumption
Up to 13 configurable I/Os
10 bit ADC, 8 bit DAC