S2 Module

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Silicon Witchery S2 Module

The S2 is a cellular IoT module built around the Nordic nRF9151, an ARM system in package with LTE Cat-M1 and GNSS. It has SPI, I2C, analog and digital IO, and power management with battery charging. Every S2 has a SoftSIM and a data plan built in. It runs Lua code that you upload over cellular with Superstack, so you need no debugger or local toolchain.

Get started Lua reference Example code Agent plugin

Feature summary

Hardware

  • ARM SiP with integrated LTE Cat-M1 and GNSS
  • Built-in antenna supporting major LTE bands
  • Multiple I/O: SPI, I2C, analog inputs, GPIO
  • Advanced power management with battery charging
  • Multiple power inputs with low power modes

Connectivity

  • SoftSIM built in, with LTE-M in the countries listed below
  • Data plan included, with no contract
  • Pairs with a fleet by its IMEI and a press of its pairing button
  • Variant with external antenna connectors

Development

  • Runs Lua code uploaded over cellular
  • Sends its log over cellular
  • Installs firmware updates automatically
  • No debugger or local toolchain needed

Use cases

Industrial & Manufacturing

  • Remote equipment monitoring and predictive maintenance
  • Environmental monitoring in factories
  • Production line automation and monitoring

Smart Agriculture

  • Crop monitoring and automated irrigation
  • Livestock tracking and health monitoring
  • Weather station networks

Smart Cities & Infrastructure

  • Energy consumption optimization
  • Environmental sensing networks
  • Waste management optimization
  • Occupancy monitoring
  • Traffic flow monitoring

Supply Chain & Logistics

  • Cold chain monitoring
  • Asset tracking and management
  • Warehouse automation
  • Fleet tracking and diagnostics

Contents

  1. Block diagram
  2. Pinout
  3. Status LEDs & button
    1. Automatic firmware updates
  4. LTE & GNSS connectivity
    1. Antenna considerations
    2. External antenna variant
  5. Power & battery interface
    1. Power inputs
    2. Power outputs
    3. Battery charger
  6. Programming
  7. Schematic
  8. Characteristics
    1. Absolute maximum ratings
    2. Recommended operating conditions
    3. Electrical characteristics
    4. RF characteristics
  9. Housing & mounting
  10. Labeling
  11. Mechanical dimensions
  12. Ordering information
  13. Compliance
    1. Approved bands
  14. Terms of purchase
  15. Let us build it for you

Block diagram

The S2 Module features two key devices:

  • ARM Cortex-M33 System in Package with Cellular & GNSS - Nordic nRF9151
  • Power management IC with switching regulation & battery charging - Nordic nPM1300

The module includes all supporting circuitry such that no external hardware except a simple power source is needed to operate the device.

S2 Module block diagram: inside the S2 Module, the nRF9151 cellular SoC drives the LTE antenna, which links to the cellular network, and the GNSS antenna, which links to satellites. The pairing button feeds the nRF9151, and the nRF9151 drives the status LEDs. The nRF9151 exchanges data with the 6x IO ports, which offer GPIO, I2C, SPI and analog to external devices, and with the nPM1300 PMIC. The PMIC takes power from the USB power port, exchanges power with the external power port and the battery port, and supplies VIO1 and VIO2 to the IO ports. S2 Module LTE Antenna GNSS Antenna Pairing Button Status LEDs USB Power Port Ext Power Port nRF9151 Cellular SoC nPM1300 PMIC 6x IO Ports GPIO I2C SPI Analog Battery Port VIO1 VIO2

The device exposes a range of I/O that can be used to connect external devices and features smart power management to run off either external power or a single-cell lithium polymer battery, saving power whenever possible.

A single button is included for easy setup and two status LEDs indicate network and power status at a glance.

The integrated antenna covers the LTE and GPS bands listed in LTE & GNSS connectivity. A variant with external antenna connectors is available for designs where the built-in antenna is not suitable.

Pinout

The S2 Module features six IO ports and three power ports. Digital IO is freely configurable across all ports, while analog inputs are limited to certain pins. A detailed description of all the pins is shown in the diagram below.

S2 Module top pinout. IO ports A, B and C are on the left edge, top to bottom, and IO ports F, E and D on the right edge, top to bottom. Ports A and B: pin 1 GND, pin 2 VOUT1, pin 3 A0 or B0, pin 4 A1 or B1. Port C: pin 1 GND, pin 2 VOUT1, pins 3 to 7 C0 to C4. Ports E and F: pin 1 GND, pin 2 VOUT2, pin 3 E0 or F0, pin 4 E1 or F1. Port D: pin 1 GND, pin 2 VOUT2, pins 3 to 7 D0 to D4. C2 to C4 and D0 to D4 support analog input. The power port on the bottom left has pin 1 VSYS, pin 2 VIN and pin 3 GND. The battery port on the bottom right has pin 1 VBATT and pin 2 GND. GND 1 VOUT1 2 A0 3 A1 4 IO PORT A GND 1 VOUT1 2 B0 3 B1 4 IO PORT B GND 1 VOUT1 2 C0 3 C1 4 ∿ C2 5 ∿ C3 6 ∿ C4 7 IO PORT C 4 F1 3 F0 2 VOUT2 1 GND IO PORT F 4 E1 3 E0 2 VOUT2 1 GND IO PORT E 7 D4 ∿ 6 D3 ∿ 5 D2 ∿ 4 D1 ∿ 3 D0 ∿ 2 VOUT2 1 GND IO PORT D 1 VSYS 2 VIN 3 GND 1 VBATT 2 GND Power Port Battery Port ∿ Supports analog input

The bottom of the module additionally exposes the same IO as the physical connectors such that the board can be mounted to a carrier PCB and electrically interfaced via pogo-pins. See the section on mechanical dimensions for a recommended landing pattern.

S2 Module bottom pinout: pogo pin pads that carry the same signals as the top connectors, mirrored. IO ports F, E and D are on the left edge, top to bottom, and IO ports A, B and C on the right edge, top to bottom. Ports A and B: pin 1 GND, pin 2 VOUT1, pin 3 A0 or B0, pin 4 A1 or B1. Port C: pin 1 GND, pin 2 VOUT1, pins 3 to 7 C0 to C4. Ports E and F: pin 1 GND, pin 2 VOUT2, pin 3 E0 or F0, pin 4 E1 or F1. Port D: pin 1 GND, pin 2 VOUT2, pins 3 to 7 D0 to D4. C2 to C4 and D0 to D4 support analog input. The battery port pads on the bottom left are pin 1 VBATT and pin 2 GND. The power port pads on the bottom right are pin 1 VSYS, pin 2 VIN and pin 3 GND. F1 4 F0 3 VOUT2 2 GND 1 IO PORT F E1 4 E0 3 VOUT2 2 GND 1 IO PORT E ∿ D4 7 ∿ D3 6 ∿ D2 5 ∿ D1 4 ∿ D0 3 VOUT2 2 GND 1 IO PORT D 1 GND 2 VOUT1 3 A0 4 A1 IO PORT A 1 GND 2 VOUT1 3 B0 4 B1 IO PORT B 1 GND 2 VOUT1 3 C0 4 C1 5 C2 ∿ 6 C3 ∿ 7 C4 ∿ IO PORT C GND 2 1 VBATT 2 VIN GND 3 1 VSYS Battery Port Power Port ∿ Supports analog input

The table below summarizes all ports and pins. Pin 1 of every IO port is GND, and pin 2 is the port’s power rail. The pin names shown are the exact strings used in Lua code.

PortConnectorPower railIO pins (connector pin №)Analog capable
PORTA4-pinVOUT1A0 (3), A1 (4)-
PORTB4-pinVOUT1B0 (3), B1 (4)-
PORTC7-pinVOUT1C0 (3), C1 (4), C2 (5), C3 (6), C4 (7)C2, C3, C4
PORTD7-pinVOUT2D0 (3), D1 (4), D2 (5), D3 (6), D4 (7)D0, D1, D2, D3, D4
PORTE4-pinVOUT2E0 (3), E1 (4)-
PORTF4-pinVOUT2F0 (3), F1 (4)-
Power connectorPins
Power Port1: VSYS, 2: VIN, 3: GND
Battery Port1: VBATT, 2: GND

The 4-pin ports follow the Stemma QT/Qwiic pin order, where pin 3 carries SDA and pin 4 carries SCL when used for I2C.

Status LEDs & button

The button is the pairing button. It does nothing except pair the module with a fleet, so someone with access to the module in the field can’t change what it does. To move the module to another fleet, unpair it with the Superstack CLI, then pair it again and press the button.

The status LEDs, meanwhile, indicate the networking and power status of the device throughout the lifetime of the application.

S2 Module status LEDs and button: the power status LED sits left of the pairing button, and the network status LED sits right of it. All three are above the USB-C port. Power status LED Network status LED Pairing button

The table below describes each of the LED states.

Both LEDs on means the module is starting or applying a firmware update. This lasts a moment.

Power LEDMeaning
Short blinks
▁▇▁▁▁▁▁▁▁▁▇▁▁▁		Running on battery power – No external power detected
Slow blinking
▇▇▇▇▁▁▁▁▇▇▇▇▁▁		Battery charging
Solid
▇▇▇▇▇▇▇▇▇▇▇▇▇▇		Battery charged
Short blanks
▇▇▇▁▇▇▇▇▇▇▇▇▁▇		Running on external power – Battery absent or not charging
Network LEDMeaning
Slow blinking
▇▇▇▇▁▁▁▁▇▇▇▇▁▁		Searching for LTE network
Solid
▇▇▇▇▇▇▇▇▇▇▇▇▇▇		Connected to the network – Not paired with a fleet
Fast blinking
▇▇▁▁▇▇▁▁▇▇▁▁▇▇		Pairing button pressed – Pairing with a fleet
Off
▁▁▁▁▁▁▁▁▁▁▁▁▁▁		Paired & idle
Short blinks
▁▇▁▁▁▁▁▁▁▁▇▁▁▁		Data transmission
Strobe
▁▇▁▇▁▇▁▇▁▇▁▇▁▇		Firmware updating Do not power off

Automatic firmware updates

Silicon Witchery releases firmware updates for the S2 Module. The module installs them automatically, with no action from you.

An update takes several minutes:

  1. The network status LED strobes while the module downloads the update. The code keeps running.
  2. The module restarts to install it.
  3. The module reconnects, and the code starts again from the beginning.

The module updates its modem firmware one version at a time, then its own firmware, so a module that is several versions behind repeats these steps. Keep the module powered until the network status LED blinks slowly while the module reconnects, and then turns off, or stays on for an unpaired module. Removing power during a download makes the download start again.

A module checks in with Superstack every 15 minutes, and when Superstack asks it to, such as after an upload. A new version of the module’s own firmware that can’t check in for 50 minutes is removed, and the module returns to the version it had before.

LTE & GNSS connectivity

The S2 Module ships with LTE Cat-M1 enabled with support for the following bands: 1, 2, 3, 4, 5, 8, 18, 19, 20, 25, 26, 65, and 66. All of which are supported by the integrated antenna. Additionally, the external antenna variant of the module supports the following bands: 12, 13, 17, 28, and 85.

Each module has a SoftSIM and a data plan built in. Data is paid for with the credit on the module’s fleet.

The following countries are included in the data plan, with more added regularly. The list follows Onomondo’s network list of 13 October 2026.

CountryConnectedCountryConnected soon
Austria✅ArgentinaValidated 📶
Belgium✅AustraliaValidated 📶
Colombia✅CanadaValidated 📶
Costa Rica✅ChileValidated
Denmark✅CroatiaValidated
Finland✅CzechiaValidated
France✅Dominican RepublicValidated
Germany✅EcuadorValidated
Iceland📶EstoniaValidated
Japan✅Faroe IslandsValidated
Latvia✅GreeceValidated
Liechtenstein✅HungaryValidated
Luxembourg✅IrelandValidated
Malta✅JamaicaValidated
Mexico✅LithuaniaValidated
Netherlands✅PortugalValidated
New Zealand📶Puerto RicoValidated
Norway✅Saudi ArabiaValidated
Poland✅South KoreaValidated
Romania✅ThailandValidated
Singapore✅  
Slovakia✅  
Slovenia✅  
Spain✅  
Sweden✅  
Switzerland✅  
Taiwan✅  
Turkey✅  
United Kingdom✅  
United States📶  
Uruguay📶  

📶 - Buy the external antenna variant for this country. Its networks carry LTE-M on the 700 MHz bands 12, 13, 17 or 28, which the integrated antenna doesn’t cover. In the United States and New Zealand the cities also have LTE-M on higher bands, so the integrated antenna works there but not in the countryside.

A country joins this table once all of it has LTE-M coverage. Many more countries, such as Italy, already have LTE-M in cities but not everywhere, so test one module at the site before you deploy a fleet there. Brazil and Israel have LTE-M networks, but their data costs many times more, so the S2 doesn’t support them. If your country isn’t listed, email info@siliconwitchery.com before you deploy.

The module also supports GPS L1 C/A and QZSS L1 C/A reception with a maximum accuracy of 2.0m in continuous tracking mode, or 3.4m in periodic tracking mode.

S2 Module LTE and GNSS section: the multi-band antenna runs along the top edge of the board. The GNSS matching circuits and the GNSS LNA and filter sit on the left, beside the gps marking. The LTE matching circuits sit on the right, beside the lte marking. The SiP with pre-programmed SIM sits in the centre. GNSS matching circuits GNSS LNA & filter Multi-band antenna LTE matching circuits SiP with pre-programmed SIM

Antenna considerations

The S2 Module features an integrated multi-band antenna supporting all the LTE and GPS bands mentioned above. To ensure optimal performance of the antennas, the antenna area must be kept clear of metal objects, and the module must not be placed inside an enclosed metal area.

For optimum GPS accuracy, the antenna should have line of sight to open sky.

S2 Module antenna clearance: keep a keep-out area clear of metal around the antenna. It extends 30mm above the top edge of the board, 30mm beyond each side of the board, and 12.2mm down from the top edge of the board. 30mm 30mm 30mm 12.2mm Keep-out area

External antenna variant

If the mounting requirements for the module within an installation make it difficult for the integrated antenna to receive good reception, then a variant of the module is available with external antenna connectors. This variant allows the module to be placed inside metal enclosures with antenna routed outside to achieve better reception.

S2 Module external antenna variant: the external GPS antenna connector sits beside the gps marking on the left of the board, and the external LTE antenna connector sits beside the lte marking on the right. External GPS antenna connector External LTE antenna connector

A wide variety of external antennas are available from various manufacturers. LTE antennas should support 698-960MHz and 1745-2200MHz with a VSWR of 3 or better. GPS antennas should support 1575MHz with a VSWR of 2 or better.

Examples of external antennas are listed below:

Power & battery interface

The S2 Module features an extensive power management solution built in. It can be powered in a variety of ways, includes lithium battery charging capabilities, as well as outputting multiple voltages to power sensors or other low power electronics. Additionally, the power management ensures low power operation of the module, saving power whenever possible.

S2 Module power interfaces: adjustable rail 0 powers the three IO ports on the left edge, and adjustable rail 1 powers the three IO ports on the right edge. The external power port, the USB-C power port and the battery port sit along the bottom edge, from left to right. Adjustable rail 0 External power port Adjustable rail 1 Battery port USB-C power port

Power inputs

The S2 Module features three options for input power:

  • Standard 5V USB-C input – VUSB
  • External 5 - 17VDC input – VIN
  • Single lithium polymer cell – VBATT
S2 Module power inputs: the external power port takes VIN on pin 2 and GND on pin 3. Its pin 1 is the VSYS output, not an input. The battery port takes VBATT and GND, and a battery temperature sensor sits beside the battery port. VIN GND VBATT GND External power port Battery port Battery temperature sensor

The USB-C input takes 5V, and the module draws up to 1.5A from it.

The external power port allows powering of the module from a DC voltage between 5 and 17V. Up to 1A may be drawn.

Finally, power can also be provided via a single lithium polymer cell. Further details on cell specifications are shown in the battery charging section below, as well as the electrical characteristic tables.

Power outputs

The module has two voltage outputs which can be used for powering external sensors or components. VOUT1 and VOUT2 are adjustable, while VSYS is fixed.

RailExposed onMax current drawAdjustable voltage output
VOUT1PORTA, PORTB, PORTC100mA across all portsOff or 1.8 - 3.3V *
VOUT2PORTD, PORTE, PORTF100mA across all portsOff or 1.8 - 3.3V *
VSYSExternal Power Port1A ⁑5V

* – **VOUT1** and **VOUT2** come from the same internal source, so they always have the same voltage. [`device.power.set_vout()`](/pages/superstack/lua#set-the-io-voltage-for-all-ports) sets both, and `0` turns both off.

⁑ – VSYS is a 5V regulated output which powers everything on the module including VOUT1, VOUT2, the radio and battery charging. Its current capability is therefore highly dependent on what else is being powered. Assuming a suitable power input to one of the input ports, VSYS is capable of providing up to 1A of current.

S2 Module power outputs: ports A, B and C on the left edge carry VOUT1 on pin 2, and ports D, E and F on the right edge carry VOUT2 on pin 2. Pin 1 of every IO port is GND, and the remaining pins are IO, not power. The external power port outputs VSYS on pin 1 and has GND on pin 3. Its pin 2 is the VIN input, not an output. GND VOUT1 GND VOUT1 GND VOUT1 GND VOUT2 GND VOUT2 GND VOUT2 VSYS GND

Battery charger

The module features charging from a single lithium cell at a configurable current from 32mA to 800mA. The charge termination voltage can be set to 3.50, 3.55, 3.60 or 3.65V, or from 4.00 to 4.45V in 50mV steps. At boot, the charger uses 3.50V and 32mA until the code sets it with device.power.battery.set_charger_cv_cc(). Higher capacity cells may be used, but will result in slower charge times.

On battery, the module draws at most 200mA from the cell while the charge current is 150mA or less, which includes the boot default. Above 150mA, it can draw up to 1A. Set a charge current above 150mA if the sensors and radio together need more than 200mA on battery.

The module features thermal regulation such that if the ambient temperature is too high to safely charge the battery, the PMIC will throttle the charge current to prevent damaging the cell. To ensure this feature works as expected, the cell must be placed against the module, and the designer should ensure to minimize any temperature differential between the cell and the module.

Programming

The S2 Module comes programmed with the Superstack firmware and a SoftSIM with a data plan. You don’t program it directly. Instead, you upload Lua code to it over cellular with Superstack, as the getting started guide shows.

You can erase the module and load your own firmware. This also erases the SoftSIM and the module’s Superstack identity, so the module can no longer use the data plan or Superstack.

S2 Module ARM SWD programming port: a six-pad Tag-Connect footprint on the back of the board, beside port D. ARM SWD programming port

The S2 Module is compatible with Tag-Connect TC2030-CTX programming cables, which can be used in conjunction with Segger J-Link debug probes for firmware development and debugging.

Schematic

The full schematic of the S2 Module is shown in the diagram below.

Silicon Witchery S2 Module Schematics

Characteristics

Ratings and characteristics of the module are listed below. For further details, the datasheets of the internal components may be referenced according to the schematic.

Absolute maximum ratings

DescriptionMinMax
USB input voltage: VUSB-0.3V22V
External input voltage: VIN-0.3V19V
Battery input voltage: VBATT-0.3V5.5V
Output rail voltages: VSYS, VOUT1, VOUT2-0.3V5.5V
PORTA - PORTF IO voltages:-0.3VVOUTx + 0.3V
LTE port RF input level*-10dBm
LTE port maximum mismatch from 50Ω*-VSWR of 10:1
GPS port RF input level*-10dBm
Storage temperature-40°C95°C
  • – External antenna variant only
DescriptionMinMax
USB input voltage: VUSB4V5.5V
External input voltage: VIN5V17V
Battery input voltage: VBATT2.3V4.45V
Operating temperature-40°C85°C

Electrical characteristics

DescriptionMinTypMax
USB overvoltage protection threshold-5.5V-
USB power-on reset release voltage-3.9V-
USB brown-out trigger voltage with VBATT not present-3.8V-
USB brown-out trigger voltage with VBATT present-3.6V-
USB input current draw: IUSB1.8mA-1.5A
Resistance between VUSB and VSYS-300mΩ-
External input current draw: IIN1mA-1A
Battery power-on reset release voltage-2.75V-
Battery brown-out trigger voltage-2.4V-
Minimum VBATT voltage for charging-2.1V-
Range of battery charging termination voltage3.50V
4.00V		50mV steps3.65V
4.45V
Range of battery charging constant current32mA2mA steps800mA
Range of battery discharge current limit200mA-1A
Resistance between VBATT and VSYS-160mΩ-
Battery charger temperature accuracy-2°C-
Trickle charge timeout-10min-
Charging timeout in CC or CV mode-7h-

RF characteristics

DescriptionMinTypMax
Supported LTE standard-LTE Rel-14 Cat-M1 HD-FDD-
Supported LTE bands-B1, B2, B3, B4, B5, B8, B12, B13, B17, B18, B19, B20, B25, B26, B28, B65, B66, B85-
LTE transmission bandwidth-1.4MHz-
LTE RX frequency range728MHz-2200MHz
LTE RX sensitivity low band-103dBm-108dBm-
LTE RX sensitivity high band-103dBm-107dBm-
LTE TX frequency range698MHz-1980MHz
LTE TX power output-40dBm-Power class 3: 23dBm
Power class 5: 20dBm
LTE port impedance⁑-50Ω-
GPS sensitivityTBD-TBD
GPS time to first fix1.3s-30.5s
GPS accuracy1.8m-3.1m
GPS port impedance⁑-50Ω-

⁑ – External antenna variant only

Housing & mounting

Both variants of the module ships with a plastic housing, as well as a set of nylon screws and standoffs for easy mounting.

  • 1x plastic housing
  • 4x 12mm M2.5 countersunk screws
  • 4x 6mm M2.5 hex standoffs
  • 4x 4mm M2.5 pan head screws

The module may be mounted to either a chassis, or a host PCB. If using the internal antenna variant of the module, ensure that there are no metal objects close to the antenna.

S2 Module mounting, exploded from top to bottom: four 12mm M2.5 nylon screws pass through the housing and the S2 Module into four 6mm nylon standoffs on the host PCB, and four 4mm M2.5 nylon screws fix the standoffs from under the host PCB. Pogo pin contacts on the host PCB sit under the module. 12mm M2.5 nylon screws Housing 6mm nylon standoffs 4mm M2.5 nylon screws S2 Module Host PCB Pogo pin contacts

If mounted to a PCB, it is possible to interface with all of the module power and IO connections using spring loaded pogo pins which press against the gold pads on the bottom of the module. If using the included 6mm standoffs, the following pogo pins are suitable:

Labeling

The position of the pre-attached IMEI label is shown below. The label displays the IMEI in both text and QR code format as shown:

S2 Module labelling: the IMEI label, with the IMEI digits and a QR code, sits on the back of the board below the S2 Module marking. IMEI label

Mechanical dimensions

Dimensional drawings of the module are shown below.

Silicon Witchery S2 Module Mechanical Drawing

Ordering information

The S2 Module is available in the following SKUs:

DescriptionPart numberPackage quantity
S2 Module with integrated antennaS2-MODULE1
S2 Module with external antenna connectorsS2-MODULE-EXT1

Compliance

Approved bands

Approved bands for the nRF9151 SiP are listed within Nordic’s documentation

Terms of purchase

The S2 Module and related software or hardware have not been approved for life-sustaining or other applications where failure may cause harm to human life, health, or damage to property or equipment. Additionally, they have not been designed according to any critical standards in order to guarantee performance or accuracy. No responsibility is assumed by Silicon Witchery for its use, nor for any infringements of patents or other rights of third parties that may result from its use. These specifications are subject to change without notice.

No liability is held by Silicon Witchery for any delay or failure in performance arising as a result of any occurrence beyond its reasonable control, including but not limited to, capacity constraints, accident, act of God, labor disputes, civil commotion, war, medical outbreak, unanticipated manufacturing problems, shortage of energy, raw materials or other supplies, requirements or acts of any government or agency thereof, including trade embargoes or medical quarantines, judicial action and/or failure or delays in transportation.

Purchasing parties agree to take responsibility that any delivered hardware, software, documentation and/or other materials, tangible or otherwise, shall not be consigned, transferred, re-exported or sold to any party or person in any way that does not adhere to the most current Export Control Regulations (“Regulations”) of the European Union Dual Use Regulations, and the Export Administration Regulations of the United States of America.

Silicon Witchery may hold back from delivering goods, services, or any other materials in its position, if it suspects they may be used outside the accordance of these Regulations.

The Purchasing Parties agree to indemnify and hold harmless Silicon Witchery against any damages, costs, losses, and/or liabilities arising out of any non-compliance with Regulations.

Let us build it for you

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