EnOcean STM 332U User manual

© 2019 EnOcean | www.enocean.com User Manual May 2019 | Page 1/49
USER MANUAL
Energy Harvesting Temperature Sensor Transmitter Module
STM 330 / STM 331 / STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
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!

© 2019 EnOcean | www.enocean.com User Manual May 2019 | Page 2/49
USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
REVISION HISTORY
The following major modifications and improvements have been made to the first version of
this document:
No
Major Changes
0.55
Initial version
0.90
New drawings added; Agency certifications added; Charging circuitry modified; editorial changes
0.91
Drawings updated
0.95
Parameters of A/D converter corrected and specified in more detail; Charging circuitry modified.
0.99
Pin for connection of backup battery changed; ICHAR modified, drawings updated
1.00
Block diagram and pin description modified.
1.01
Table in 2.11 modified
1.02
Remark added in 3.5; additional remarks in 2.11; label information modified in chapter 5; Shelf life
added in 1.4; supply voltage for programming added in 2.2; Conducted output power replaced by radi-
ated output power in 1.2; programming interface added in 2.3.2; other editorial changes
1.03
Support for HSM 100 humidity sensor module added
1.04
Specification of shelf life improved; figure added in 3.3.1; Chapter Related Documents added.
1.05
STM 331 with helix antenna added (naming + helix antenna description), hints to update module via
STMSEN
1.10
Product variants STM 332U and STM 333U added
1.15
Included PCB Drawings of STM 332U / STM 333U
1.20
Added information on connector type
1.30
Added advanced security information of firmware STM 330 / STM 331. Default manufacturer ID code is
EnOcean.
1.31
Improved ext. button circuit example to avoid keybounce of digital inputs, deleted STM 300C, R&TTE ->
R&TTE / RED, deleted EOP 300
1.4
New Dolphin layout, STM 330C deleted, Added STM 331U, R&TTE -> RED
2.0
Update with long term energy storage replacement, additional transport mode for shelf storage & air
cargo, optimized secure mode, additional information on market approval for secondary battery, new
drawings, new QR code and deleted 315 MHz antenna description, brand changed
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.

© 2019 EnOcean | www.enocean.com User Manual May 2019 | Page 3/49
USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
TABLE OF CONTENT
1RELATED DOCUMENTS ...................................................................................5
2GENERAL DESCRIPTION .................................................................................6
2.1 Basic functionality .........................................................................................6
2.2 Technical data...............................................................................................8
2.3 Physical dimensions .......................................................................................9
2.3.1 Mechanical outline of STM 330 ....................................................................9
2.3.2 Mechanical outline of STM 331 .................................................................. 10
2.3.3 Mechanical outline of STM 331U ................................................................ 11
2.3.4 Mechanical outline of STM 332U ................................................................ 12
2.3.5 Mechanical outline of STM 333U ................................................................ 13
2.4 Environmental conditions ............................................................................. 14
2.5 Ordering Information ................................................................................... 14
3FUNCTIONAL DESCRIPTION .......................................................................... 15
3.1 Commissioning and mode change.................................................................. 15
3.2 Simplified firmware flow chart for standard /secure mode................................. 16
3.3 Simplified device block diagram..................................................................... 17
3.4 Pin out ....................................................................................................... 18
3.5 Pin description and operational characteristics................................................. 19
3.5.1 GPIO supply voltage ................................................................................ 20
3.5.2 Analog and digital inputs .......................................................................... 21
3.5.3 Temperature sensor................................................................................. 21
3.5.4 Programming Interface............................................................................. 22
3.6 Absolute maximum ratings (non operating) .................................................... 23
3.7 Maximum ratings (operating)........................................................................ 23
3.8 Power management and voltage regulators .................................................... 23
3.9 Configuration .............................................................................................. 24
3.9.1 Configuration via pins .............................................................................. 24
3.9.2 Configuration via serial interface ............................................................... 25
3.10 Radio telegram....................................................................................... 27
3.10.1 Default configuration and standard mode ................................................... 27
3.10.2 Teach-in telegram ................................................................................... 28
3.11 Secure radio telegram ............................................................................. 28
3.11.1 Enhances security telegram ...................................................................... 28
3.11.2 Secure Teach-In ...................................................................................... 29
3.12 Transmit timing...................................................................................... 29
3.12.1 Secure transmission timing....................................................................... 29
3.13 Charging circuitry ................................................................................... 30
3.14 Energy consumption ............................................................................... 31
3.14.1 Consumption in enhanced security mode .................................................... 32
3.15 Storing the Rolling code counter in enhanced security operation ................... 32
4APPLICATIONS INFORMATION....................................................................... 33
4.1 Using the WAKE pins.................................................................................... 33
4.2 Temperature sensor..................................................................................... 34
4.3 Set point control and occupancy button.......................................................... 34
4.4 Combination with humidity sensor module HSM 100 ........................................ 34
4.5 Antenna layout............................................................................................ 35
4.5.1 Whip antenna (STM 330 / STM 332U) ........................................................ 35
4.5.2 Helical antenna (STM 331 / STM 331U/ STM 333U)...................................... 36

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USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
4.6 Mounting STM 33x into a housing .................................................................. 37
4.7 Transmission range ..................................................................................... 38
5RADIO CERTIFICATIONS .............................................................................. 39
5.1 Radio Equipment Directive (RED) for the European Union ................................. 39
5.2 FCC (United States) certification.................................................................... 41
5.2.1 331U / 332U / 333U LIMITED MODULAR APPROVAL ..................................... 41
5.2.2 STM 331U / STM 332U / STM 333U FCC Grant ............................................ 43
5.2.3 FCC Regulatory Statements ...................................................................... 44
5.3 ISED (former Industry Canada) certification ................................................... 45
5.3.1 STM 332U / STM 333U IC Technical Approval Certificate............................... 46
5.3.2 ISED (former Industry Canada) Regulatory Statements................................ 47
6Additional information .................................................................................. 48
6.1 Product label............................................................................................... 48
6.1.1 Laser markings........................................................................................ 48
6.1.2 QR Code................................................................................................. 48
6.2 Rechargeable accumulator............................................................................ 49

© 2019 EnOcean | www.enocean.com User Manual May 2019 | Page 5/49
USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
1RELATED DOCUMENTS
STM 33x modules are available in several frequency, antenna and button position variants:
STM 330 (868.3 MHz, whip antenna, vertical/backside oriented LRN button)
STM 331 (868.3 MHz, helical antenna, vertical/backside oriented LRN button)
STM 331U (902.875 MHz, helical antenna, vertical/backside oriented LRN button)
STM 332U (902.875 MHz, whip antenna, side oriented LRN button)
STM 333U (902.875 MHz, helical antenna, side oriented LRN button)
This document describes operation of STM 330, STM 331U, 331C, STM 332U, STM 333U
modules with their built-in firmware.
If you want to write own firmware running on the integrated micro controller or need more
detailed information on the Dolphin core please also refer to Dolphin Core Description and
Dolphin API Documentation at: http://www.enocean.com/en/knowledge-base/
If you want to connect other generic sensors to STM 33x (former STM 310 applications),
you can download STEMSEN Software from following link:
http://www.enocean.com/en/download/
Module can be configured and/or programmed via EDK 350 / EOP 350 programmer board.
For mechanical integration please refer to our 3D drawings found at
http://www.enocean.com/en/enocean_modules/stm-330/
If you want to add a humidity sensor please refer to the HSM 100 data sheet at
http://www.enocean.com/en/enocean_modules/stm-330/
In addition we recommend following our application notes, in particular AN102: Antenna
Basics –Basic Antenna Design Considerations for EnOcean based Products

© 2019 EnOcean | www.enocean.com User Manual May 2019 | Page 6/49
USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
2GENERAL DESCRIPTION
This user manual specifies STM 33x modules with stepcode DE or later:
See chapter “6.1 Product Label” to find out the module stepcode
User manual for older modules can be downloaded from the product website
For a detailed description of product changes see Product Change Notification (PCN).
2.1 Basic functionality
The extremely power saving RF transmitter module
family STM 33x of EnOcean is optimized for realization
of wireless and maintenance free temperature sensors,
or room operating panels including set point dial and
occupancy button. It requires only a minimum number
of external components and provides an integrated and
calibrated temperature sensor.
Power supply is provided by a small pre-installed solar
cell, an external energy harvester, or an external 3 V
backup battery.
An energy storage element is installed in order to bridge periods with no supply from the
energy harvester. The module provides a user configurable cyclic wake up.
After wake up, the internal microcontroller reads the status of the temperature sensor and
optional set point dial. A radio telegram will be transmitted in case of a significant change
of measured temperature or set point values or if the external occupancy button is pressed.
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 the input for
the occupancy button or the internal LRN button.
All variants include the enhanced secure mode. In enhanced secure mode the communica-
tion is protected by enhanced security features e.g. encryption and authentication. The
modules can be switched from transport mode to standard or secure mode. The firmware
can be configured to use different EEPs according to the availability set point dial and occu-
pancy button.
Features with built-in firmware
Pre-installed solar cell with energy storage and charging circuit
On-board LRN button
On-board Tx indicator LED
Calibrated internal temperature sensor
On board connector for external occupancy button and set point dial input
Configurable wake-up and transmission cycle
Wake-up via Wake pins or LRN button
Exemplary image

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USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
Support for humidity sensor module HSM 100
Communication protected by enhanced security features
(to enable this feature, the receiver or gateway has to support EnOcean security)
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
Integrated temperature sensor
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

© 2019 EnOcean | www.enocean.com User Manual May 2019 | Page 8/49
USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
2.2 Technical data
Available variants
frequency, antenna, learn button
STM 330: 868.3 MHz, whip, back button
STM 331: 868.3 MHz, helical, back button
STM 331U: 902.875 MHz, helical, back button
STM 332U: 902.875 MHz, whip, side button
STM 333U: 902.875 MHz, helical, side button
Radio standard
EnOcean 902 MHz / 868 MHz
Data rate/Modulation type
125 kbps / ASK (868 MHz), FSK (902 MHz)
Radiated output power
STM 330: +8 dBm1(EIRP) ± 2.5 dB2
STM 331: +5 dBm1(EIRP) ± 2.5 dB2
STM 331U: +99 dBµV/m1± 2 dB2
STM 332U: +101 dBµV/m1± 2 dB2
STM 333U: +99 dBµV/m1± 2 dB2
Power supply @ VDD
Pre-installed solar cell
Illumination 50-100000 lux
2.1 V–5.0 V, 2.6 V needed for start-up
Operation time in darkness @ 25°C
min. 10 days, if energy storage fully charged3
Operation start up time with empty
energy store
typ. <2.5 min @ 400 lux / 25 °C
incandescent or fluorescent light
Input channels
Internal: temperature sensor, LRN button
External: occupancy button, set point dial, HSM 100
Temperature sensor
Measurement range 0-40 °C, resolution 0.16 K
Accuracy typ. ±0.5 K between 17 °C and 27 °C
typ. ±1 K between 0 °C and 40 °C
EnOcean Equipment Profiles
configurable EEPs: A5-02-05 (default), A5-02-30,
A5-10-05, A5-10-03
and with HSM 100: A5-04-01, A5-10-10, A5-10-12
SIGNAL 0x0E (Entering Transport Mode)
Connector
20 pins, grid 1.27 mm, □0.4 mm
Radio regulations
RED (EU): STM 330 / STM331
FCC (US) / ISED (CA): STM 331U / STM 332U / 333U
Encryption algorithms
VAES 128 / CMAC
1Measured in test laboratory, measurement uncertainty 2.7 dB
2Tolerance of measurement in production at 50 Ω
3At default configuration (wake-up cycle 100 s, transmission cycle 1000 s).
Energy storage performance degrades over life time, especially if energy storage is long time
exposed to very high temperatures. High temperatures will accelerate aging. Very low temperature
will temporary reduce capacity of energy store and this leads to considerable shorter dark time operation.

© 2019 EnOcean | www.enocean.com User Manual May 2019 | Page 9/49
USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
2.3 Physical dimensions
2.3.1 Mechanical outline of STM 330
PCB dimensions 43±0.2 x 16±0.3 x 1±0.1 mm
Module height 8 mm
Weight 4.5 g

© 2019 EnOcean | www.enocean.com User Manual May 2019 | Page 10/49
USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
2.3.2 Mechanical outline of STM 331

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USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
2.3.3 Mechanical outline of STM 331U

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USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
2.3.4 Mechanical outline of STM 332U

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USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
2.3.5 Mechanical outline of STM 333U

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USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
2.4 Environmental conditions
Operating temperature -20 °C … +60 °C
Storage temperature -20 °C … +60 °C, recommended4: +10 °C…+30 °C, <60%r.h.
Shelf life (in absolute darkness) 36 months after delivery
Humidity 0% … 93% r.h., non-condensing
Deep discharge of the energy storage leads to degradation of perform-
ance. Radio modules will be delivered in transport mode to avoid this. If
there is a storage time after configuration or commissioning, the radio
module has to be switched back to transport mode to reduce power con-
sumption to a minumum.
If a storage time of more than 36 months is required, the energy storage
(MS414FE) has to be recharged (e.g. 2 days @ 1.000 lux) or with external 3.1 V.
2.5 Ordering Information
Type
Ordering Code
Frequency
Note
STM 330
S3001-D330
868.3 MHz
whip antenna, back oriented LRN button
STM 331
S3001-D331
868.3 MHz
helical antenna, back oriented LRN button
STM 331U
S3051-D331
902.875 MHz
helical antenna, back oriented LRN
STM 332U
S3051-D332
902.875 MHz
whip antenna, side oriented LRN button
STM 333U
S3051-D333
902.875 MHz
helical antenna, side oriented LRN button
The module shall not be placed on conductive materials, to prevent discharge of
the internal energy storages. Even materials such as conductive foam (ESD pro-
tection) may have negative impact.

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USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
3FUNCTIONAL DESCRIPTION
3.1 Commissioning and mode change
The module will be shipped in transport mode to switch off the energy store for long term
shelf storage and air cargo. The mode can be changed by pressing the learn button. The
procedure for enter the standard mode has not been changed to keep compatible with
modules before stepcode DE.
Make sure that the solar cell will get enough light for mode change and/or learn telegram.
Change from transport to standard mode
After pressing the learn button 1x short (1s) the radio module will enter Standard Mode
(Mode 1). The LED will flash 1x and a standard learn telegram will be sent.
Change from standard to secure mode
After pressing the learn button 2x long (2x 5s, pause <1s) the radio module will enter
Secure Mode (Mode 2). A secure learn telegram will be sent and the LED will flash 2x.
Change from secure or standard mode to transport mode
After pressing the learn button 1x long (5s) the radio module will enter Transport Mode
(Mode 3). A signal telegram will be sent and the LED will flash 3x.
The following diagram illustrates all implemented mode transitions.
Short press: 1 s (firmware 0.1 –3.0 s)
Long press: 5 s (firmware 3 –7 s)
2x long press with very short pause of max. 1 s between

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USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
Customers can adapt the mode change options via module configuration:
* Transport/Standard/Secure Mode change on (default see diagram above) or
* limited to Transport & Secure Mode (details sup[email protected]) or
* limited Transport & Standard Mode (details sup[email protected])
Before changing the operating mode please make sure to clear the device from all
receivers which have been taught to work with this device before. Otherwise the
receiver will ignore the telegrams and the application will not work.
The flag for actual mode itself is stored in non-volatile memory. After power down
reset the previous selected mode is active. The mode change is limited to 50
times. In normal application scenario only very few are required.
3.2 Simplified firmware flow chart for standard /secure mode

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USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
3.3 Simplified device block diagram
SET
GND
CW_1
CW_0
OCC
CP_1CP_0
LRN
VDD Whip or helical
antenna
UVDDext
RESET
BALUN
Presence Signal
(every 100th,
every 10th,
every cyclic wake-up
or SW defined)
Spontaneous
wake-up
Cyclic Wake-up
(every 1 s ,10 s , 100 s,
or SW defined) A/D
Power management Micro
Controller
RF Transmitter
868.3 MHz (STM 33x)
315.0 MHz (STM 330C)
902.875 MHz (STM 33xU)
DOLPHIN
EO3000I
16MHz Oscillator
SWPWR
Energy
Storage
VCHAR
VGC
Solar Cell
LRN button
Transmit
Indicator
HSM

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USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
3.4 Pin out
The figure above shows the pin out and location of the extension connector provided by
STM 33x modules. The connector pins are named according to the naming of the EO3000I
chip to simplify usage of the DOLPHIN API.
The connector type is Samtec FTSH-110-01-L-DV-P-TR or a functional equivalent. Please refer to
Samtec for detailed drawings and recommendation about suitable mating connectors as
needed.
The table in section 3.4 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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USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
3.5 Pin description and operational characteristics
STM 33x
Hardware
Symbol
STM 33x
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 3.8
Not available at pin header.
Supply for pro-
gramming I/F
Recommended supply voltage for
programming 3V
VCHAR
VCHAR
Charging input
Input for an external energy harvester or a
battery. See 0.
Supply for pro-
gramming I/F if
VDD cannot be
used.5
Recommended supply voltage for
programming 3.3V –3.6 V
VGC
VGC
Voltage Gold Cap
Connection of additional external energy
storage possible. See 0.
SWPWR
(= switched
DVDD of
EO3000I)
SWPWR
DVDD supply volt-
age regulator out-
put 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 0.25 ms before sampling of
inputs and is switched off afterwards.
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
4.1. Limited to max. 1 µA output current
by internal 1.8 MΩ resistor!
IOVDD (not
available at
pin connec-
tor)
IOVDD
GPIO supply volt-
age
Internal connection to EO3000I DVDD
(typ. 1.8 V)
See 3.5.1
RESET
RESET
Reset input
Programming I/F
Active high reset (1.8 V)
Fixed internal 10 kΩ pull-down.
PROG_EN
PROG_EN
Programming I/F
HIGH: programming mode active
LOW: operating mode
Digital input, fixed internal 10 kΩ pull-
down.
ADIO0
SET
Analog input
For connection of an external set point
dial. See 4.3
ADIO1
Not used
Internal pull-up; do not connect
ADIO2
Not used
Internal pull-up; do not connect
5E.g. if module shall be programmed or configured via pin connector.
If a bed of nails fixture for programming is available VDD should be used instead of VCHAR.

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USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
ADIO3
HSM
Input for HSM 100
Internal pull-up; leave open or
connect HSM 100
ADIO4
Not used
Internal pull-up; do not connect
ADIO6
Not used
Internal pull-up; do not connect
ADIO7
Programming I/F
Leave open
SCSEDIO0
CW_1
Encoding input for
wake-up cycle
Configuration interface.
Leave open or connect to GND. See 3.9.1.
Internal pull-up
Programming I/F
SCLKDIO1
CW_0
Encoding input for
wake-up cycle
Configuration interface.
Leave open or connect to GND. See 3.9.1.
Internal pull-up
Programming I/F
WSDADIO2
CP_1
Encoding input for
retransmission
Configuration interface.
Leave open or connect to GND. See 3.9.1.
Internal pull-up
Programming I/F
RSDADIO3
CP_0
Encoding input for
retransmission
Configuration interface.
Leave open or connect to GND. See 3.9.1.
Internal pull-up
Programming I/F
WAKE0
OCC
Wake input
Input for external occupancy button.
Change of logic state leads to wake-up and
transmission of a telegram if correct EEP
selected. See 3.9.2.
Must be connected to UVDDext or GND!
At time of delivery WAKE0 is connected to
UVDDext via a jumper at the connector.
See also 4.1.
WAKE1
LRN
LRN input
Press (HIGH to LOW) transmission of
teach-in telegram. Long press (typ. 10 sek
in LOW) leads to mode change. –STM 330
/ STM 331.
Internal pull-up to UVDD.
See also 3.10 and 4.1.
3.5.1 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.