Sfera Labs Strato Pi Base User Manual

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Strato Pi Base User Guide

June 2020

Revision 023

SPBB30X Strato Pi Base board

SPMB30X Strato Pi Base server with Raspberry Pi 3 Model B

SPMB30XP Strato Pi Base server with Raspberry Pi 3 Model B+

SPMB30X41 Strato Pi Base server with Raspberry Pi 4 Model B 1GB

SPMB30X42 Strato Pi Base server with Raspberry Pi 4 Model B 2GB

SPMB30X44 Strato Pi Base server with Raspberry Pi 4 Model B 4GB

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Page 1 SPMB30X Strato Pi Base server with Raspberry Pi 3 Model B SPMB30XP Strato Pi Base server with Raspberry Pi 3 Model B+ SPMB30X41 Strato Pi Base server with Raspberry Pi 4 Model B 1GB SPMB30X42 Strato Pi Base server with Raspberry Pi 4 Model B 2GB SPMB30X44 Strato Pi Base server with Raspberry Pi 4 Model B 4GB  ...
Page 2: Table Of Contents
Conﬁguring the serial port Using Strato Pi Base Real Time Clock ATECC608A secure element Serial port Buzzer Hardware watchdog Power cycle Advanced conﬁguration Thermal considerations for Strato Pi Base server Block diagram Technical speciﬁcations Dimensions Disposal Strato Pi Base User Guide...
Page 3 Installation and use restrictions Standards and regulations Safety instructions Set-up Conformity Information CANADA RCM AUSTRALIA / NEW ZEALAND Compliance information for Raspberry Pi CANADA Strato Pi Base User Guide...
Page 4 Customer acknowledges and agrees that any such use of Strato Pi Base is solely at Customer's risk, and that Customer is solely responsible for compliance with all legal and regulatory requirements in connection with such use.
Page 5: Safety Information
Indicates a hazardous situation which, if not avoided, may result in death or serious personal injury. CAUTION Indicates a hazardous situation which, if not avoided, can result in minor or moderate personal injury. NOTICE Indicates a situation which, if not avoided, can result in damage of property. Strato Pi Base User Guide...
Page 6: Safety Instructions
Use only appropriate tools when installing this product. Using excessive force with tools may damage the product, alter its characteristics or degrade its safety. Battery This product uses a small lithium non-rechargeable battery to power its internal real time clock (RTC). Strato Pi Base User Guide...
Page 7 100°C and protect from direct sunlight, moisture and condensation. Dispose of used batteries according to local regulations and the battery manufacturer's instructions.  Strato Pi Base User Guide...
Page 8: Introduction
Introduction Strato Pi Base enhances the Raspberry Pi Model B version 2, 3 and 4 computers with several hardware features to make it suitable for use in professional applications where reliability and service continuity are key requirements. Strato Pi Base is available as a bare board or fully assembled unit, including a Raspberry Pi 3 Model B or B+ or Raspberry Pi 4 Model B, in a standard DIN-rail case.
Page 9: Features
Features Strato Pi Base board and server: ✓ 9-28Vdc power supply, with surge and reverse polarity protection, and 2.2A resettable fuse ✓ up to 4.0A max current to the 5V Raspberry Pi power supply input pins (at 24Vdc) ✓ real time clock with replaceable CR1025 Lithium / Manganese Dioxide back-up battery ✓...
Page 10: Usage And Connections
Usage and connections STRATO PI BASE CONNECTION DIAGRAM Device identiﬁcation The device can be identiﬁed with the information provided in the rating and identiﬁcation plate, permanently attached to the side of the case. EXAMPLE RATING AND IDENTIFICATION PLATE Strato Pi Base User Guide...
Page 11: Hardware Installation
Base. Strato Pi Base server The Strato Pi Base server comes pre-assembled with a Raspberry Pi 3 Model B or B+ or Raspberry Pi 4 Model B board, in a plastic standard DIN-rail case. There is no need to open the case, unless a change in the RS-485 termination resistors is required (see below).
Page 12 The RTC backup battery holder is soldered to the bottom layer of the circuit board, between the GPIO connectors. In the Strato Pi Base server, the battery is not accessible from the outside. You should ﬁrst remove the case top body to gain access to the Strato Pi Base circuit board.
Page 13: Terminal Block
RTC BACKUP BATTERY OPENING THE CASE OF RASPBERRY PI 4 MODEL B MODELS Terminal block Strato Pi Base has a 9 positions terminal block for power and serial connections. The maximum conductor cross section is 1.5 mm (16 AWG), or 0.5 mm when using ferrules (highly recommended).
Page 14: Power Supply
When a Strato Pi Base board is used, never connect the Raspberry Pi micro-USB power plug. The Strato Pi Base power supply stage is optimised to deliver up to 4A at 5V to the Raspberry Pi. Because Strato Pi has a 2.2A resettable fuse (polyfuse) on the power supply line, the maximum current that its regulator can deliver is also limited by this fuse, and depends on the input voltage.
Page 15 0.64 4.97 1.94 1.38 0.68 4.96 FUSE 1.43 0.71 4.95 1.54 0.76 4.92 1.88 0.89 4.91 FUSE 0.94 4.90 1.02 4.88 1.08 4.85 1.10 STRATO PI BASE POWER SUPPLY STAGE TYPICAL IN/OUT VOLTAGE AND CURRENT Strato Pi Base User Guide...
Page 16: Dedicated Gpio Pins
GPIO16 set to high to enable the shutdown cycle GPIO20 set to high to sound the buzzer GPIO13 soft serial TX for Strato MCU conﬁguration GPIO19 soft serial RX for Strato MCU conﬁguration Strato Pi Base User Guide...
Page 17: Software Installation And Configuration
Software installation and conﬁguration All features of Strato Pi Base are controlled via dedicated GPIO, the I C bus and a soft serial RX/TX interface to the embedded micro-controller and can be used with most operating systems and programming languages.
Page 18: Installing The Real Time Clock Software
$ sudo hwclock -w Then recheck the time stored in the hardware clock to ensure it matches. Linux may have failed to automatically update the hardware clock after the last reboot if its internal registers contained invalid values. Strato Pi Base User Guide...
Page 19: Configuring The Serial Port
Alternatively, you may use the pi3-miniuart-bt overlay to switch Bluetooth to use the mini UART (ttyS0), and restore ttyAMA0 to GPIOs 14 and 15. Refer to the Raspberry Pi UARTs documentation page for additional information. https://www.raspberrypi.org/documentation/conﬁguration/uart.md Strato Pi Base User Guide...
Page 20 If you are using Strato Pi’s serial ports for your applications, you also need to disable the Linux serial console, otherwise it will send console data to the serial port. Disable the ttyAMA0 console service: sudo systemctl disable serial-getty@ttyAMA0.service Edit the /boot/cmdline.txt ﬁle and delete the serial console conﬁguration: console=serial0,115200 Strato Pi Base User Guide...
Page 21: Using Strato Pi Base
✓ Guaranteed unique 72-bit serial number. Serial port Strato Pi Base uses the Raspberry Pi standard UART TX/RX pins on the GPIO connector to implement a standard serial port with support for both RS-232 and RS-485. Strato Pi Base User Guide...
Page 22 JP1 and JP3 respectively. A 100 Ohm termination resistor between A and B can be enabled installing jumper JP2. RS-485 JUMPERS SCHEMATIC Strato Pi Base User Guide...
Page 23: Buzzer
Strato Pi will wait 60 seconds more, then power cycle the Raspberry Pi. Note that Strato Pi Base will power cycle the Raspberry Pi even if GPIO16 is not set high. In this case the power cycles occurs 120 seconds after the heartbeat timeout.
Page 24: Power Cycle
Power cycle You can start a delayed power cycle by rising Raspberry Pi’s GPIO16 pin. When GPIO16 is set to high, Strato Pi Base will wait 60 seconds and then power off the Pi board for 5 seconds. The power cycle also affects the VSOUT auxiliary power supply output.
Page 25: Thermal Considerations For Strato Pi Base Server
The Strato Pi main regulator also generates heat proportionally to the total amount of current that it has to supply to the Raspberry and, if present, external devices. The thermal behaviour of Strato Pi Base server is dynamic and affected by operating conditions and the external environment temperature.
Page 26 35C AMBIENT TEMPERATURE, LOW CPU LOAD 35C AMBIENT TEMPERATURE, HIGH CPU LOAD Strato Pi Base User Guide...
Page 27 45C AMBIENT TEMPERATURE, LOW CPU LOAD 45C AMBIENT TEMPERATURE, HIGH CPU LOAD Strato Pi Base User Guide...
Page 28: Block Diagram
Block diagram STRATO PI BASE BLOCK DIAGRAM Strato Pi Base User Guide...
Page 29: Technical Specifications
Only use CR1025 Lithium / Manganese Dioxide (Li/ MnO2) batteries.  Real time clock Expected battery life without main power supply: ~2 years All tests performed with Raspbian Buster Lite and, on Raspberry Pi 4, VL805 ﬁrmware version 000137ab. Strato Pi Base User Guide...
Page 30 Housing standard 4M for DIN rail Operating temperature 0…+50 °C Storage temperature -20…+70 °C Protection degree IP20 30 g (Strato Pi Base board) Weight 150 g (Strato Pi Base server) Strato Pi Base User Guide...
Page 31: Dimensions
Dimensions DIMENSIONS (mm) Strato Pi Base User Guide...
Page 32: Disposal
Strato Pi Base contains a small non rechargeable manganese dioxide lithium coin battery. In the Strato Pi Base server, the battery is not accessible from the outside. You should ﬁrst remove the case top body to gain access to the Strato Pi Base circuit board. Always remove the battery before disposing of this product.
Page 33 This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Strato Pi Base User Guide...
Page 34 AC:2012 - Emission for residential, commercial and light-industrial environments. Compliance information for Raspberry Pi Strato Pi Base model SPMB30X contains a standard Raspberry Pi 3 Model B single board computer. Strato Pi Base model SPMB30XP contains a standard Raspberry Pi 3 Model B+ single board computer.
Page 35 (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement. Strato Pi Base User Guide...
Page 36 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Sfera Labs SPMB21X SPBB21X SPMB21XP SPBB30X SPMB30X42 SPMB30XP SPMB30X44 SPMB30X48...

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