This information describes the type of component and shall not be considered as assured
characteristics. No responsibility is assumed for possible omissions or inaccuracies. Circuitry
and specifications are subject to change without notice. For the latest product specifications, refer to the EnOcean website: http://www.enocean.com.
As far as patents or other rights of third parties are concerned, liability is only assumed for
modules, not for the described applications, processes and circuits.
EnOcean does not assume responsibility for use of modules described and limits its liability
to the replacement of modules determined to be defective due to workmanship. Devices or
systems containing RF components must meet the essential requirement s of the local le gal
authorities.
The modules must not be used in any relation with equipment that supports, directly or
indirectly, human health or life or with applications that can result in danger for people,
animals or real value.
Components of the modules are considered and should be disposed of as hazardous waste.
Local government regulations are to be observed.
Packing: Please use the recycling operators known to you. By agreement we will take packing material back if it is sorted. You m ust bear the costs of transport. For packing material
that is returned to us unsorted or that we are not obliged to accept, we shall have to invoice you for any costs incurred.
Subject to modifications
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1 GENERAL DESCRIPTION
The extremely power-saving RF transmitter module STM110C from EnOcean enables the
implementation of wireless and maintenance-free sensors. Power supply is provided by a
solar cell. An integrated energy storage allows operation for several days in total darkness.
1.1 Basic Functionality
Three 8-bit A/D converter inputs and 4 digital inputs facilitate multif unctional detector systems, based on passive sensing components. This allows easy and convenient monitoring of
temperature, illumination, etc. – or controlling window and door states – or supervising
input voltages or input currents respectively.
Figure 1: STM110C sensor transmitter module
1.2 Typical Applications
• Building installation
• Industrial automation
• Consumer electronics
The STM110C module serves the 315 MHz air interface protocol of EnOcean. Together with
the transceiver modules TCM200 / TCM210C, this module can be easily integrated into operation and control units for the realization of various application-specific system solutions.
The module is part of a powerful RF system solution from EnOcean for operation and control applications. Because the RF transmitters are self-powered, maintenance-free RF systems can be implemented.
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1.3 Technical Data
Power supply Solar Power Generator (discrete optical cell), or 2.2 - 5.0V external
Frequency / Conducted transmission power 315.0 MHz / 12dBm
Data rate / Modulation type 125 kbps / ASK
Transmission range 300m free field, typ. 30m indoor
Module identifier individual 32-bit ID factory-programmed
EnOcean telegram type 4BS (“Four Byte Sensor”)
Telegram packet length (sub-telegram) 1.2 ms ±5%
No. of (redundant) packets 3 packets within about 40ms, delay effected at random
Input channels 3 x analog inputs (8-bit resolution), 4 x digital inputs
Spontaneous wake-up differential external trigger signal, minimum wake interval 7ms
Cyclic wake-up user-configurable (every 1, 10, 100, or 110 s, tolerance ± 20%)
Redundant retransmission user-configurable, affected at random
Illumination 100 lx up to 100. 00 0 lx
Operation startup time with empty energy store < 10 min @ 400 lx
Operation time during total darkness > 60 h 1)
1)
RF transmission statistically every 17 min, 100s wake-up, temperature 25°C, Goldcap formatted
Ext. power supply output 3.0 V ±3%, 1mA max., ~2.6ms (during wake-up time)
Ext. voltage reference output 2.05V ±3%, 1mA max., ~2.6ms (during wake-up time)
Input sample time after wake-up >1.7 ms
Transmitting indication output (LED) 3.0V ±3%, 2mA max., 3 x 1.2 ms within 40ms
A change of WAKE pin status forces the onboard controller instantly to check all current
analog and digital input values. In addition, a user-programmable cyclic wake-up is provided.
After wake-up, a radio telegram (input data, unique 32-bit sensor ID, checksum) is transmitted in case of a change of any digital input value compared to the last sendin g or in case
of a significant change of measured analog values: >
or >
14LSB of AD_2. In case of a triggered wake-up a radio telegr am is sent in any case.
In case of no relevant input change, a redundant retransmission is sent after a while to
announce all current input values. Between the wake-up phases, the module is in sleep
mode for minimum power consumption.
There is a serial interface which allows to configure several parameters of the module:
- Threshold values of the AD inputs which lead to immediate radio transmission
- Manufacturer code (information about manufacturer and type of device)
In case a manufacturer code is programmed into the module and DI3=0 at wake-up the
module will transmit a dedicated teach-in telegram containing the manufacturer code.
Subject to modifications
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1.4 Physical Dimensions
Dimensions of PCB 21.0 x 40.0 x 9.0 mm (incl. energy store and wiring pins)
Dimensions of solar cell 35.0 x 13.0 x 1.1 mm (for details see chapter 5)
Antenna pre-installed 15 cm whip antenna
Connector: 20 pins, dual row male, grid 1.27 mm
20
19
2
1
Figure 2
: STM110C package outlines
1.5 Environmental Conditions
Operating temperature -25°C up to + 65 °C
Storage temperature -25°C up to +65 °C
Humidity (PCB) 0% to 95% r.h.
Humidity (Solar cell, rear side) 0% to 60% r.h., no condensate 1)
1)
For corrosion protection, see chapter 3.5
The product life strongly depends on the temperature as the Goldcap used for
energy storage degrades with higher temperature. As a reference the lifetime (capacitance reduced to 70% of nominal value) of the Goldcap is reduced from
100.000 h to 5.000 h when the temperature is raised from 25°C to 65°C.
1.6 Ordering Information
Type EnOcean Ordering Code Radio Frequency Solar Cell
STM110C S3031-D110 315.0 MHz Included
STM111C S3031-D111 315.0 MHz Not included
Subject to modifications
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2 FUNCTIONAL DESCRIPTION
2.1 Block Diagram
V_SC1
V_SC1
Goldcap
Goldcap
V_SC2
V_SC2
*) DI_xand AD_xinputvalues are transmitted ...
*) DI_x and AD_x input values are transmitted ...
-If wake-upandaninput value has changed
- If wake-up and an input value has changed
-At wake-up and presencesignal time
- At wake-up and presence signal time
RF Transmitter
RF Transmitter
Power, Data*)
Power , Da ta*)
ANT
ANT
(whip)
(whip)
LED
LED
Processor
Processor
Redundant
Redundant
retransmission
retransmission
(every 70th-140th,
(every 70th - 140th,
every 7th -14th,
every 7t h - 14t h,
every cyclicwake-up)
every cycl ic wake-u p)
CP_1CP_0
CP_1CP_0
Digital
Digital
Inputs
Inputs
A/D
A/D
8-bit
8-bit
DI_0
DI_0
DI_1
DI_1
DI_2
DI_2
DI_3
DI_3
AD_0
AD_0
AD_1
AD_1
AD_2
AD_2
WAKE
WAKE
WAKE
WAKE
CW_1
CW_1
CW_0
CW_0
Power control&
Powe r c on t ro l &
wake-up timer
wake -u p timer
Spontaneous
Spontaneous
wake-up
wake-up
Cyclic wake-up
Cyclic wake-up
(every 1,10,100,
(every 1,10, 100,
or 110s)
or 110 s)
Active during
Active during
wake-up only
wake-up only
V_REFV_OUT
V_REFV_OUT
Wake-up
Wake-up
(power on)
(pow er on)
Ready
Ready
(power off)
(power off)
GND
GNDGND
Figure 3: STM110C block diagram
Module power supply
The supplied solar cell has been designed especially for the STM110C for maximum module
performance at smallest dimensions. The active solar area is divided into two to provide
independent module power supplies:
V_SC1: Main power supply input. Must be connected to the STM110C solar cell
(small active area) or by another external energy source respectively
V_SC2: Goldcap charging input by connecting to the STM110C solar cell (big active
area)
The capacitance of the Goldcap may be reduced after long term storage of modules without energy supply. It may take up to one day of charging until the full
capacitance is recovered.
Continuous operation at temperatures higher than 50°C may decrease th e capacitance of the Goldcap. This will result in shorter charging times and shorter operating times in total darkness!
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Power control
The power control supervises V_SC1 supply and charging status of the energy store. It controls the power supply for wake-up timer, microprocessor, HF transmitter and the supply
outputs.
Power supply outputs
Two power supply outputs are available:
a) V_OUT
b) V_REF (stabilized reference voltage)
The outputs are active after wake-up during the active state of the module to drive an external sensor user circuitry.
Wake-up timer
The wake-up timer provides user-programmable wake-up time intervals for activating the
processor and an external wake-up opportunity (WAKE pins).
Features:
Extremely low power consumption during sleeping time period
Cyclic processor wake-up configurable by user through external pin configuration
(CW_0, CW_1)
The sleep mode can be terminated immediately by changing the pin status of the
differential WAKE inputs. Note that the WAKE inputs are part of a special capacitor
circuitry that offers lowest operating power consumption (current flow at switching
over time only).
WAKE and /WAKE always have to be operated via switch-over as shown in the
following:
WAKE
WAKE
WAKE
WAKE
GND
GND
Figure 4: External WAKE pin circuit
A radio telegram is always transmitted after wake-up via WAKE pins!
After transmission the counter for redundant retransmission is reset to a random
number in the confi
ured range.
See chapter 2.5 for configuration of wake-up cycle times.
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Processor
Controls all functionalities after wake-up: First, the values of all measurement inputs are
sampled. After that, RF signal transmission is triggered if one or more of the following conditions are met:
a) One of the input values has changed since the last radio transmission (one of the 4
digital inputs has changed or one of the 3 analog inputs has changed equal to or
more than a defined value of the total measurement range), or
b) Counter for redundant retransmission is elapsed
c) The wake-up has been triggered via the WAKE pins
After every RF transmission, all measurement values are stored for data comparison at
next wake-up time.
See chapter 2.5 for configuration of timing of redundant retransmission.
RF transmitter
The radio transmitter is powered up by the processor when the sending condition is positive. The output LED is activated temporarily during telegram transmission.
Digital inputs are transmitted
within sensor DATA_BYTE0
(least significant 4 bits): DI_0 =
Bit 0, DI_1 = Bit 1, DI_2 = Bit
2, DI_3 = Bit3).
DI_2 and DI_3 are also us ed as
serial interface pins for the configuration of the module. See
page 21.
A signal change of WAKE inputs
stops sleep mode immediately.
A radio telegram is always
transmitted after wake-up via
WAKE pins! (change compared
to STM100!)
Encoding input for processor
wake-up cycle time: 1, 10, 100,
or 110 seconds approximately.
Encoding input for determining
the number of cyclic wake-up
signals that trigger the redun-
Sample moment after wake-up: 1.7 ms …
2.6 ms
Resolution: 8-bit
Input impedance: >100kΩ
(1 bit = V_REF/256 = 8mV
Accuracy vs. V_REF @25°C typ. ±2LSB,
max ±4LSB).
Relevant input change:
> 5 LSB of AD_1
> 6 LSB of AD_0
> 14 LSB of AD_2
These default values may be changed. See
page 23
Sample moment after wake-up: 1.7 ms …
2.6 ms
Real digital TTL input with internal pull-up
(change compared to STM100!)
LOW voltage: <0.45 V
HIGH voltage: > 2.45V
Input impedance >100kΩ
Differential input (capacitive):
- connect to GND via switch
over only
- Resistance to GND < 100 Ω
- Switch over time < 1ms
- Minimum time between wake
signals > 7ms
- Pins should be connected to
V_SC1 if not needed in
application
- max. external allowed leakage
current 100pA
Pins should be left open or connected to
GND
Resistance to GND < 10 Ω
Cyclic wake-up time value strongly depends
on actual power supply voltage and temperature (up to ±20%)
Pins should be left open or connected to
GND
Resistance to GND < 100 Ω
Subject to modifications
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9
10
11
19
17
8
16
ANT
dant retransmission: Every
Input impedance >100kΩ
wake-up signal, or every 7th 14th, or every 70th - 140th or no
redundant retransmission.
V_OUT Module power supply output
available during wake-up phase
to drive an external sensor cir-
3.0V ±3%, ~2.6ms,
I
= 1 mA max.
Vout
cuitry by the user.
Also used for starting serial
mode.
V_REF Reference voltage output availa-
ble during wake-up phase to
drive an external sensor circuit
2.05 V ±3%, ~2.6ms,
I
= 1 mA max.
Vref
by the user.
LED Output for optional external LED
to indicate every telegram
transmission (short flashing)
3.0 V ±3%, 2 mA max.,
source impedance 470 Ω ±1%,
~3 x 1.2 ms within 40 ms
Also used for starting serial
mode.
V_SC1 Main power supply input. Con-
nect V_SC1 in series with a
Schottky diode of Type BAS 125
When using other energy source than the
supplied solar panel (see chapter 3.6):
2.2 – 5.0 V
to SOL1 of the STM110C solar
cell (smaller area, see Figure 9).
Or connect to another external
energy source respectively.
V_SC2 Goldcap charging input. Connect
V_SC2 in series with a Schottky
For use with the solar cell only (Vo < 5.0 V)!
diode of Type BAS 125 to SOL2
of the STM110C solar cell (bigger area, see Figure 9).
GND
Ground connections
Whip antenna λ/4
Please find recommendations on antenna
mounting in chapter 3.2
Never connect an input (like CP_0..1, AD_0..2, DI_0..3) to a permanent supply
voltage! These inputs should be always left open, connected to GND or connected
to the own V_OUT and / or V_REF (active only during measurement time!). Otherwise they would permanently draw current from the permanent power supply
and could also damage the device (see absolute maximum ratings 2.3 below)
If such a function is absolutely needed, please insert a diode to avoid the problem.