EnOcean STM 31 Series User manual

USER MANUAL V1.01
EnOcean GmbH
Kolpingring 18a
82041 Oberhaching
Germany
Phone [phone]
Fax [phone]
[e-mail]
www.enocean.com
Subject to modifications
STM 31x / STM 31xC User Manual V1.01
April 8, 2011 11:57 AM
Page 1/32
Patent protected:
WO98/36395, DE 100 25 561, DE 101 50 128,
WO 2004/051591, DE 103 01 678 A1, DE 10309334,
WO 04/109236, WO 05/096482, WO 02/095707,
US 6,747,573, US 7,019,241
Observe precautions! Electrostatic sensitive devices!
Scavenger Transmitter Module
STM 31x / STM 31xC
April 8, 2011
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STM 31X / STM 31XC
REVISION HISTORY
The following major modifications and improvements have been made to the first version of
this document:
No Major Changes
0.5 Initial version
0.90 New drawings added; Agency approvals added; new charging circuitry added; edi-
torial changes
0.91 Chapter 3.3 added
0.95 Parameters of A/D converter corrected and specified in more detail; charging cir-
cuitry modified; editorial changes
0.99 Pin for connection of backup battery changed; ICHAR modified in 2.4 and s.5; sec-
tion 3.4 inserted; update of drawings
1.00 Editorial changes
1.01 Block diagram and pin description modified; Application note for analog measure-
ment added; Configuration options modified
Published by EnOcean GmbH, Kolpingring 18a, 82041 Oberhaching, Germany
www.enocean.com, [e-mail], phone ++49 (89) 6734 6890
© EnOcean GmbH
All Rights Reserved
Important!
This information describes the type of component and shall not be considered as assured characteris-
tics. 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 web-
site: 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 contain-
ing RF components must meet the essential requirements of the local legal 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.
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STM 31X / STM 31XC
TABLE OF CONTENT
1GENERAL DESCRIPTION .................................................................................4
1.1 Basic functionality..........................................................................................4
1.2 Technical data...............................................................................................5
1.3 Physical dimensions .......................................................................................5
1.4 Environmental conditions................................................................................7
1.5 Ordering Information .....................................................................................7
2FUNCTIONAL DESCRIPTION ............................................................................8
2.1 Simplified firmware flow chart and block diagram ..............................................8
2.2 Pin out .........................................................................................................9
2.3 Pin description and operational characteristics.................................................10
2.3.1 GPIO supply voltage.................................................................................12
2.3.2 Analog and digital inputs ..........................................................................13
2.4 Absolute maximum ratings (non operating) ....................................................14
2.5 Maximum ratings (operating) ........................................................................14
2.6 Power management and voltage regulators.....................................................15
2.7 Configuration ..............................................................................................16
2.7.1 Configuration via pins...............................................................................16
2.7.2 Configuration via serial interface................................................................17
2.8 Radio telegram............................................................................................18
2.8.1 Normal operation.....................................................................................18
2.8.2 Teach-in telegram....................................................................................19
2.9 Transmit timing...........................................................................................19
2.10 Charging circuitry ...................................................................................20
2.11 Energy consumption................................................................................20
3APPLICATIONS INFORMATION.......................................................................22
3.1 Using the WAKE pins....................................................................................22
3.2 Analog measurement ...................................................................................23
3.3 Antenna options ..........................................................................................24
3.3.1 Whip antenna (STM 310, STM 310C, STM 312, STM 312C) ...........................24
3.3.2 Helical antenna (STM 311, STM 311C)........................................................25
3.4 Mounting ECT 310 or a battery (STM 312 / STM 312C only) ..............................26
3.5 Mounting STM 31x into a housing ..................................................................27
3.6 Transmission range......................................................................................28
4AGENCY CERTIFICATIONS ............................................................................29
4.1 CE Approval ................................................................................................29
4.2 FCC (United States) certification ....................................................................30
4.3 IC (Industry Canada) certification ..................................................................32
5Label Information ........................................................................................32
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STM 31X / STM 31XC
1GENERAL DESCRIPTION
1.1 Basic functionality
The extremely power saving RF transmitter module
STM 31x of EnOcean enables the realization of a
wide range of wireless and maintenance free sen-
sors such as temperature sensors, humidity sen-
sors, or room operating panels.
Power supply is provided by a small solar cell, an
external energy harvester, or an external 3 V back-
up battery. An energy storage element is installed
to bridge periods with no supply from the energy
harvester. The module provides a user configurable
cyclic wake up.
After wake up, the external sensors are supplied
and after a configurable delay (default 2 ms) the
internal microcontroller reads the status of the con-
nected 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.
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
wake-up, a wake up can be triggered externally using a wake input or the internal LRN but-
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:
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
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STM 31X / STM 31XC
1.2 Technical data
A
ntenna whip or helical antenna installed
Fre
q
uenc
y
315.0 MHz (STM 31xC)/868.3 MHz (STM 31x)
Radio Standard EnOcean 868 MHz/315 MHz
Data rate/Modulation t
yp
e 125 kbps/ASK
Conducted Out
p
ut Power typ. 2 dBm1
Power Su
pp
l
y
@ VDD Pre-installed solar cell (except STM 312 / STM 312C)
Illumination 50-100000 lux
2.1 V–5.0 V, 2.6 V needed for start-up
Initial operation time in darkness @
25°C
typ. 4 days, energy storage fully charged, wake-up every
100 s, transmission of telegram every 1000 s on average2
O
p
eration start u
p
time with em
p
t
y
ener
gy
store
t
yp
. 2.5 min @ 400 lux / 25°C
incandescent or fluorescent light
In
p
ut Channels 3x digital input, 2x WAKE input , 3x analog input
2x analog reference input
Resolution: 3x 8 bit or 1x 10 bit, 1x 8 bit, 1x 6 bit
Radio Re
g
ulations R&TTE EN 300 220 (STM 31x)
FCC CFR-47 Part 15 (STM 31xC)
1.3 Physical dimensions
1Matched to impedance of whip antenna (not 50 Ω)
2Full performance of the PAS614L energy storage is achieved after several days of opera-
tion (up to two weeks) at good illumination level. Performance degrades over life time, es-
pecially if energy storage is exposed to higher temperatures. Each 10 K drop in tempera-
ture doubles the expected life span.
PCB dimensions 43±0.2 x 16±0.3 x 1±0.1 mm
Module height 8 mm
Weight 3.5 g (STM 312) – 6.4 g (STM 311C), depending on variant
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STM 31X / STM 31XC
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STM 31X / STM 31XC
1.4 Environmental conditions
Operating temperature -20 °C … +60 °C
Storage temperature -20 °C … +60 °C, recommended3: +10 °C…+30 °C, <60%r.h.
Humidity 0% … 93% r.h., non-condensing
1.5 Ordering Information
Type Ordering Code Frequency
STM 310 S3001-D310 868.3 MHz
STM 311 S3001-D311 868.3 MHz
STM 312 S3001-D312 868.3 MHz
STM 310C S3031-D310 315.0 MHz
STM 311C S3031-D311 315.0 MHz
STM 312C S3031-D312 315.0 MHz
3Recommended for maximum life of energy storage capacitor
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STM 31X / STM 31XC
2FUNCTIONAL DESCRIPTION
2.1 Simplified firmware flow chart and block diagram
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STM 31X / STM 31XC
GND
WAKE0
CONF_1CONF_0
LRN
VDD Whip or
helical antenna
UVDDext
RESET
BALUN
Configuration
Spontaneous
wake-up
A/D
Power management Micro
Controller
RF Transmitter
868.3 MHz (STM31x)
315.0 MHz (STM31xC)
DOLPHIN
EO3000I
16MHz Oscillator
SWPWR
Energy
Storage
VCHAR
VGC
Solar Cell
LRN button
Transm it
Indicator
AD_2
AD_1
AD_0
DI_2
DI_1
DI_0
REFP
REFN
2.2 Pin out
The figure above shows the pin out of the STM 31x hardware. The pins are named accord-
ing to the naming of the EO3000I chip to simplify usage of the DOLPHIN API.
The table in section 2.3 shows the translation of hardware pins to a naming that fits the
functionality of the built-in firmware.
Energy
Store
LRN
LED
1
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STM 31X / STM 31XC
2.3 Pin description and operational characteristics
STM 31x
Hardware
Symbol
STM 31x
Firmware
Symbol
Function Characteristics
GND GND Ground connection
VDD VDD Supply voltage 2.1 V – 5.0 V; Start-up voltage: 2.6 V
Maximum ripple: see 2.6
Not available at pin header.
Connection of external 3 V battery possi-
ble. See 3.4.
VCHAR VCHAR Charging input Input for an external energy harvester (for
use in STM 312) or a battery. See 2.10.
VGC VGC Voltage Gold Cap Connection of additional external energy
storage. See 2.10.
SWPWR
(= switched
DVDD of
EO3000I)
SWPWR DVDD supply vol-
tage regulator
output switched
via transistor con-
trolled by EO3000I
ADIO5 pin.
1.8 V. Output current: max. 5 mA.
Supply for external circuitry, available
while not in deep sleep mode. SWPWR is
switched on 2 ms (default) before sam-
pling of inputs and is switched off after-
wards. The delay time can be configured,
see 2.7.2 (needed for stabilization of sen-
sors)
UVDDext
(=UVDD of
EO3000I
with 1.8MΩ
in series)
UVDDext Ultra low power
supply voltage
regulator output
Not for supply of external circuitry!
For use with WAKE pins only, see section
3.1. Limited to max. 1 µA output current
by an internal 1.8 MΩresistor!
IOVDD (not
available at
pin connec-
tor)
IOVDD GPIO supply vol-
tage
Internal connection to EO3000I DVDD
(typ. 1.8 V)
See 2.3.1.
RESET RESET Reset input
Programming I/F
Active high reset (1.8 V)
Fixed internal 10 kΩpull-down.
PROG_EN PROG_EN Programming I/F HIGH: programming mode active
LOW: operating mode
Digital input, fixed internal 10 kΩpull-
down.
ADIO0 AD_0 Analog input Input read ~2 ms after wake-up.
Resolution 8 bit (default) or 10 bit.
See also 2.7.2.
ADIO1 AD_1 Analog input Input read ~2 ms after wake-up.
Resolution 8 bit (default) or 6 bit.
See 2.7.2.
ADIO2 AD_2 Analog input Input read ~2 ms after wake-up.
Resolution 8 bit.
See 2.7.2.
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STM 31X / STM 31XC
ADIO3 REFN Negative reference
input
Input is read ~2 ms after wake-up and is
interpreted as negative voltage reference
See 3.2
ADIO4 REFP Positive reference
input
Input is read ~2 ms after wake-up and is
interpreted as positive voltage reference
See 3.2
ADIO6 DI_2 Digital input Input read ~2 ms after wake-up.
See 2.7.2.
Internal pull-up
ADIO7 Programming I/F Leave open
SCSEDIO0 DI_0 Digital input Input read ~2 ms after wake-up.
See 2.7.2.
Internal pull-up
Programming I/F
SCLKDIO1 DI_1 Digital input Input read ~2 ms after wake-up.
See 2.7.2.
Internal pull-up
Programming I/F
WSDADIO2 CONF_1 Encoding input Configuration interface.
Leave open or connect to GND. See 2.7.1.
Internal pull-up
Programming I/F
RSDADIO3 CONF_0 Encoding input Configuration interface.
Leave open or connect to GND. See 2.7.1.
Internal pull-up
Programming I/F
WAKE0 WAKE0 Wake input Change of logic state leads to wake-up and
transmission of a telegram.
Must be connected to UVDDext or GND!
At time of delivery WAKE0 is connected to
UVDDext via a jumper at the connector.
See also 3.1.
WAKE1 LRN LRN input Change of logic state to LOW leads to
wake-up and transmission of teach-in tele-
gram.
Internal pull-up to UVDD.
See also 2.7.2, 2.8.2, and 3.1.
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STM 31X / STM 31XC
2.3.1 GPIO supply voltage
The IOVDD pin of EO3000I is internally connected to DVDD. For digital communication with
other circuitry therefore a voltage of 1.8 V has to be used. While the module is in deep
sleep mode the microcontroller with all its peripherals is switched off and DVDD, IOVDD,
and SWPWR are not supplied.
If DVDD=0 V and IOVDD is not supplied (e.g. while in sleep mode), do not apply
voltage to ADIO0 to ADIO7 and the pins of the serial interface (SCSEDIO0,
SCLKDIO1, WSDADIO2, RSDADIO3). This may lead to unpredictable malfunction
of the device.
For I/O pins configured as analog pins the IOVDD voltage level is not relevant! See
also 2.3.2.
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STM 31X / STM 31XC
10
0x00
0xFF
ideal
real
Offset Error
Gain Error
CodeADC
UADC
URVDD
2.3.2 Analog and digital inputs
Parameter Conditions / Notes Min Typ Max Units
Analog Input Mode (with external circuitry as described in 3.2)
Measurement range Single ended REFN REFP
Input coupling DC
Measurement bandwidth462.5 kHz
Input impedance Single ended against
GND @ 1 kHz
10 MΩ
Input capacitance Single ended against
GND @ 1 kHz
10 pF
Effective measurement resolution 10 Bit
10bit measurement
Offset error 0 LSB
Gain error 0 LSB
INL TBD TBD LSB
DNL TBD LSB
8bit measurement
Offset error 0 LSB
Gain error 0 LSB
INL TBD LSB
DNL
TBD
LSB
Offset Error: Describes the offset between the minimal possible code and
code 0x00.
Gain Error: Describes the offset between maximum possible code and full
scale (e.g. 0x3FF for 10bit measurements).
Integral Non-Linearity (INL): Describes the difference between the ideal
characteristics and the real characteristics. Only values between minimum and
maximum possible code are considered (excluding offset error and gain error).
Differential Non-Linearity (DNL): Measures the maximum deviation from
the ideal step size of 1 LSB (least significant bit).
Effective resolution: Results from the signal-noise ratio of the ADC and is
given in Bit. The number describes how many bits can be measured stable. The
criterion selected here is that the noise of DNL is <±0.5 LSB.
Measurement Bandwidth: The measurement bandwitdh is internally limited
by filters. A quasi static signal must be applied as long as the filter needs to
settle. SettlingTime= 1/(MeasurementBandwidth)*ln(2^resolution[Bit])
43 dB input bandwidth, resulting in 111 µs settling time to achieve a deviation of an input
signal <1 LSB (<0.098% @ 10 bit resolution).
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STM 31X / STM 31XC
Parameter Conditions / Notes Min Typ Max Units
Digital Input Mode
Input HIGH voltage 2/3
IOVDD
V
Input LOW voltage 1/3
IOVDD
V
Pull up resistor @IOVDD=1.7 … 1.9 V 90 132 200 kΩ
2.4 Absolute maximum ratings (non operating)
Symbol Parameter Min Max Units
VDD Supply voltage at VDD -0.5 5.5 V
VGC Voltage gold cap 1.5 3.3 V
VCHAR Supply voltage from external energy harvester 0 6 V
ICHAR Supply current from external energy harvester 45 mA
GND Ground connection 0 0 V
VINA Voltage at every analog input pin -0.5 2 V
VIND Voltage at RESET, WAKE0/1, and every digital input -0.5 3.6 V
2.5 Maximum ratings (operating)
Symbol Parameter Min Max Units
VDD Supply voltage at VDD and VDDLIM 2.1 5.0 V
VGC Voltage gold cap 1.5 3.3 V
VCHAR Supply voltage from external energy harvester 0 6 V
ICHAR
Supply current from external energy harvester
VCHAR < 4 V
4 V<VCHAR<6 V
Limited
internally
45 mA
GND Ground connection 0 0 V
VINA Voltage at every analog input pin 0 2.0 V
VIND Voltage at RESET, WAKE0/1, and every digital input 0 3.6 V
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STM 31X / STM 31XC
2.6 Power management and voltage regulators
Symbol Parameter Conditions / Notes Min Typ Max Units
Voltage Regulators
VDDR Ripple on VDD, where
Min(VDD) > VON
50 mVpp
UVDD Ultra Low Power supply 1.8 V
RVDD RF supply Internal signal only 1.7 1.8 1.9 V
DVDD Digital supply Internal signal only 1.7 1.8 1.9 V
Threshold Detector
VON Turn on threshold 2.3 2.45 2.6 V
VOFF Turn off threshold Automatic shutdown if
VDD drops below VOFF
1.85 1.9 2.1 V
Threshold detector
STM 31x provides an internal ultra low power ON/OFF threshold detector. If VDD > VON, it
turns on the ultra low power regulator (UVDD), the watchdog timer and the WAKE# pins
circuitry. If VDD ≤VOFF, it initiates the automatic shut down of STM 31x. For details of this
mechanism please refer to the Dolphin Core Description documentation.
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STM 31X / STM 31XC
2.7 Configuration
2.7.1 Configuration via pins
The encoding input pins have to be left open or connected to GND in correspondence with
the following connection schemes. These settings are checked at every wake-up.
CONF_0 CONF_1 Wake-up
cycle time
Number of wake-ups that
trigger a redundant retransmission
NC NC 100 s ±20% Every 7th - 14th timer wake-up signal, affected at random
NC GND 10 s ±20% Every 70th - 140th timer wake-up signal, affected at random
GND NC 100 s ±20% Every timer wake-up signal
GND GND No cyclic wake-up No redundant retransmission
A radio telegram is always transmitted after wake-up via WAKE pins!
After transmission the counter is reset to a random value within the specified in-
terval.
According to FCC 15.231a) a redundant retransmission at every timer wake-up to
determine the system integrity is only allowed in safety and security applications!
In this case the total transmission time must not exceed two seconds per hour,
which means that a combination with a 1 s wake-up cycle time is not allowed!
If applied in other (non-safety, non-security) applications a minimum of 10 s be-
tween periodic transmissions is required. In addition the device has to comply with
the lower field strength limits of 15.231e). The limited modular approval of STM
31xC is not valid in this case.
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STM 31X / STM 31XC
2.7.2 Configuration via serial interface
Via the programming interface the configuration area can be modified. This provides a lot
more configuration options. Values set via serial interface override hardware settings!
These settings are read after RESET or power-on reset only and not at every wake-up of
the module!
The interface is shown in the figure below:
Parameter Configuration
via pins
Configuration
via serial interface
Wake up cycle See section 2.7.1 Value can be set from 1 s to 65534 s
Redundant
Retransmission cycle
See section 2.7.1 Min…Max values for random interval
If Min=Max -> random switched off
Threshold values for
analog inputs
(transmission of telegram if
threshold value exceeded)
No The default values are: 5 LSB at AD_1 input, 6
LSB at AD_0 and 14 LSB at AD_2.
The threshold value can be set between 0 and
full scale for every input individually.
Resolution of the analog
inputs
No Default: AD_0: 8 bit, AD_1: 8 bit, AD_2: 8 bit
Option: AD_0: 10 bit, AD_1: 6 bit, AD_2: 8 bit
Input mask No A digital input mask for ignoring changes on
digital input pins. At default all input bits are
checked.
Delay time between SWPWR
on and sampling moment
(for stabilization of external sensor
measurement values)
No Value can be set from 0 ms to 508 ms in steps
of 2 ms. Default delay time is 2 ms.
Source of AD_2 No Select if AD_2 contains measurement value of
external ADIO2 pin or from internal VDD/4
Edge of wake pin change
causing a telegram trans-
mission
No Every change of a wake pin triggers a wake-up.
For both wake pins it can be configured indivi-
dually if a telegram shall be sent on rising, fall-
ing or both edges.
Manufacturer ID and EEP
(EnOcean Equipment Profile)
No Information about manufacturer and type of
device. This feature is needed for “automatic”
interoperability of sensors and actuators or bus
systems. Unique manufacturer IDs are distri-
buted by the EnOcean Alliance.
USB <= > SPI
interface SPI
USB
Dolphin Studio, or EOP
Reset
PROG_EN
ADIO7
SCSEDIO0
SCLKDIO1
WSDADIO2
RSDADIO3
STM
31x
VDD
GND
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STM 31X / STM 31XC
EnOcean provides EOPx (EnOcean Programmer, a command line program) and Dolphin
Studio (Windows application for chip configuration, programming, and testing) and the
USB/SPI programmer device as part of the EDK 300 developer´s kit.
2.8 Radio telegram
2.8.1 Normal operation
Telegram content (seen at serial interface of RCM 130/TCM 3x0 or at DOLPHIN API):
ORG = 0x07 (Telegram type “4BS”)
Data_Byte1..3
3x8bit mode:
DATA_BYTE3 = Value of AD_2 analog input
DATA_BYTE2 = Value of AD_1 analog input
DATA_BYTE1 = Value of AD_0 analog input
1x8bit, 1x6it, 1x10bit mode:
DATA_BYTE3 = Value of AD_2
DATA_BYTE2 = Upper 2 bits of AD_0 and value of AD_1
DATA_BYTE1 = Lower 8 bits Value of AD_0 analog input
DATA_BYTE0 = Digital sensor inputs as follows:
Bit 7 Bit 0
Reserved, set to 0 1DI_2 DI_1 DI_0
ID_BYTE3 = module identifier (Byte3)
ID_BYTE2 = module identifier (Byte2)
ID_BYTE1 = module identifier (Byte1)
ID_BYTE0 = module identifier (Byte0)
DATA_BYTE3 DATA_BYTE2 DATA_BYTE1
AD_2 AD_1 AD_0
7 6 5 4 3 2 1 0 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
The voltages measured at the analog inputs can be calculated from these values as follows:
U=(Value of AD_x)/(2n)x1.8 V n=resolution of channel in bit
Please note the limitations in the measurement ran
g
e of the A/D converter as
shown in 2.3.2.
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STM 31X / STM 31XC
2.8.2 Teach-in telegram
In case of a wake-up via WAKE1 pin (LRN input) the module transmits a teach-in telegram.
If the manufacturer code is not set, the module transmits a normal telegram according to 2.8.1
with the difference that DI_3=0.
If a manufacturer code is set, this teach-in telegram contains special information as described
below.
With this special teach-in telegram it is possible to identify the manufacturer of a device
and the function and type of a device. There is a list available from the EnOcean Alliance
describing the functionalities of the respective products.
ORG = 0x07 (Telegram type “4BS”)
DATA_BYTE0..3 see below
LRN Type = 1
LRN = 0
DI0..DI2: current status of digital inputs
Profile, Type, Manufacturer-ID defined by manufacturer
RE0..2: set to 0
ID_BYTE3 = module identifier (Byte3)
ID_BYTE2 = module identifier (Byte2)
ID_BYTE1 = module identifier (Byte1)
ID_BYTE0 = module identifier (Byte0)
O
R
G Data_Byte3 Data_Byte2 Data_Byte1 Data_Byte0 ID
Function
6 Bit
Type
7 Bit
Manufacture
r
-
ID 11 Bit
LRN Type
1Bit
RE2
1Bit
RE1
1Bit
RE0
1Bit
LRN
1Bit
DI2
1Bit
DI1
1Bit
DI0
1Bit
2.9 Transmit timing
The setup of the transmission timing allows avoiding possible collisions with data packages
of other EnOcean transmitters as well as disturbances from the environment. With each
transmission cycle, 3 identical subtelegrams are transmitted within 40 ms. The transmis-
sion of a subtelegram lasts approximately 1.2 ms. The delay between the three transmis-
sion bursts is affected at random.
If a new wake-up occurs before all sub-tele
g
rams have been sent, the series of
transmissions is stopped and a new series of telegrams with new valid measure-
ment values is transmitted.
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USER MANUAL V1.01
© 2010 EnOcean | www.enocean.com STM 31x / STM 31xC User Manual V1.01 | Page 20/32
STM 31X / STM 31XC
2.10 Charging circuitry
The figure below shows the internal charging circuit. It is controlled via the WXODIO pin of
EO3000I which switches according to the status of the internal threshold detector. For de-
tails please refer to our Dolphin Core Description documentation. The WXIDIO pin is used to
disconnect the energy storage element at voltages below VOFF to avoid deep discharge.
An external 3 V backup battery can be connected at VDD (STM 312 only, see 3.4) or at
VCHAR.
2.11 Energy consumption
Current Consumption of STM 31x
Charge needed for one measurement and transmit cycle: ~130 µC
Charge needed for one measurement cycle without transmit: ~30 µC
(current for external sensor circuits not included)
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 sto-
rage while consumption of electric charge is constant.
0.00001
0.0001
0.001
0.01
0.1
1
10
100
0 102030405060708090100
Time [ms]
Current [mA]
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