Description
The Strato Pi UPS board enhances the Raspberry Pi computer with several hardware features to make it suitable for use in industrial and professional applications where reliability and service continuity are key requirements.
This add-on board is the the core of our Strato Pi UPS server and Strato Pi Touch Display and can be purchased separately for product evaluation, prototypes developments, or custom embedded designs.
Features
Mounting:
- standard Raspberry Pi 40-pin GPIO header
- power supply and serial connections on screw terminal block
Power supply:
- 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)
- auxiliary power supply output voltage, to power external devices through Strato Pi UPS
- integrated uninterruptible power supply (UPS), with external lead-acid 12V battery
- 2.2A resettable fuse on battery input
- simple UPS control and feedback via GPIO
Serial interfaces:
- standard RS-232 and RS-485 interfaces to the Raspberry Pi serial line, with opto-isolator and electrostatic discharge protection
High reliability and security:
- hardware watchdog implemented in the Strato Pi board, fully independent from the Raspberry Pi, controlled via GPIO
- real time clock (RTC) with replaceable back-up battery
- embedded Microchip ATECC608A secure element chip
- integrated boot loader for the Strato Pi micro-controller, allowing in-field firmware upgrades directly from the Raspberry Pi
More:
- buzzer, controlled via GPIO
- LEDs for power supply, battery and serial line activity
Specifications
| Power supply | 9-28V⎓ (VDC)
Reverse polarity protection with 2.2A resettable fuse. Surge protection up to ±1000V/2ohms 1.2/50μs |
| Battery input | 12V lead acid battery (not provided).
Suggested capacity: 1.2Ah. Reverse polarity protection with 2.2A resettable fuse. Surge protection up to ±500V/2ohms 1.2/50μs |
| UPS battery maximum charge voltage | 15V |
| UPS battery charge current | 30…100mA |
| Voltage threshold for switching to battery mode | 7.2V, 0.2V hysteresis |
| Current consumption at VS+ 12V⎓
including Raspberry Pi 4, with Ethernet and RS-485 connected, no USB devices |
low CPU load: 320mA
100% CPU load, before throttling: 590mA 100% CPU load, throttled: 500mA Actual current consumption may vary based on working conditions |
| Current consumption at VS+ 24V⎓
including Raspberry Pi 4, with Ethernet and RS-485 connected, no USB devices |
low CPU load: 190mA
100% CPU load, before throttling: 320mA 100% CPU load, throttled: 260mA Actual current consumption may vary based on working conditions |
| Raspberry platform compatibility | Pi 4 Model B
Pi 3 Model B+ Pi 3 Model B Pi 2 Model B (tested with Pi 4 Model B for regulatory compliance) |
| Serial communication ports | RS-485 Half-Duplex with automatic data direction management
RS-232 Full-Duplex |
| Baud Rates on COMM ports | 1200 to 115200 |
| ESD-Protection Voltage on RS-232 TX/RX | ±15kV human body model
±8kV contact discharge |
| ESD-Protection Voltage on RS-485 A/B | ±15kV human body model
±8kV contact discharge |
| Surge protection on RS-485 A/B | Surge protection up to ±500V/2ohms 1.2/50μs; 600W peak pulse power capability at 10/1000μs waveform |
| Fail safe feature on RS-485 | Yes |
| Electromagnetic immunity compliance | EN 61000-4-2 (ESD)
EN 61000-4-3 (Radiated RF Field) EN 61000-4-4 (Burst/fast transient) EN 61000-4-5 (Surge) EN 61000-4-6 (Conducted) EN 61000-4-8 (Power frequency magnetic field) |
| Real time clock | Internal RTCC circuit with backup lithium battery. Only use CR1025 Lithium / Manganese Dioxide (Li/MnO2) batteries. Expected battery life without main power supply: ~2 years |
| Operating temperature | 0…+50 °C |
| Storage temperature | -20…+70 °C |
| Weight | 35 g |