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Summary of Contents for Sfera Labs Strato Pi Fan SPBF10X
- Page 1 Strato Pi Fan User Guide February 2021 Revision 001 SPBF10X Strato Pi Fan ...
- Page 2 Safety information Qualified personnel Hazard levels Safety instructions General safety instructions Introduction Features Usage and connections Hardware Installation Device identification Power supply GPIO pins I2C header Software installation and configuration Raspberry Pi OS kernel module Using Strato Pi Fan I2C Control Thermal considerations Circuit schematic Technical specifications...
- Page 3 Please download and read the Sfera Labs Terms and Conditions document available at: http://www.sferalabs.cc Strato and Sfera Labs are trademarks of Sfera Labs S.r.l. Other brands and names may be claimed as the property of others. Copyright © 2021 Sfera Labs S.r.l. All rights reserved.
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Page 4: Safety Information
Safety information Carefully and fully read this user guide before installation and retain it for future reference. Qualified personnel The product described in this manual must be operated only by personnel qualified for the specific task and installation environment, in accordance with all relevant documentation and safety instructions. -
Page 5: Safety Instructions
Safety instructions General safety instructions Protect the unit against moisture, dirt and any kind of damage during transport, storage and operation. Do not operate the unit outside the specified technical data. Never open the housing. If not otherwise specified, install in closed housing (e.g. distribution cabinet). - Page 6 Introduction Strato Pi Fan is an expansion board that enhances the Raspberry Pi Model B version 2, 3 and 4 with a high speed temperature controlled fan, expanding the operating temperature range of the Raspberry Pi and reducing or delaying CPU throttling under heavy CPU load. Features ✓...
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Page 7: Usage And Connections
Usage and connections STRATO PI FAN BOARD INSTALLED ON THE RASPBERRY PI Hardware Installation The Strato Pi Fan board is supplied with all connectors pre-installed. No soldering is required. You should connect Strato Pi to Raspberry Pi aligning the GPIO connector. Ensure that no conductive part of one board touches any part of the other board. -
Page 8: Device Identification
THE STRATO PI FAN CIRCUIT BOARD Device identification The device can be identified with the information provided in the rating and identification plate, placed on the device packaging. EXAMPLE RATING AND IDENTIFICATION PLATE Power supply Strato Pi Fan receives power from the Raspberry Pi GPIO connector. Both 3.3V and 5V are required to operate. - Page 9 GPIO pins Strato Pi Fan uses the following Raspberry Pi’s GPIO pins: Pin # Function Description 3.3V line 5.0V line GND line GPIO2/SDA C SDA line GPIO3/SCL C SCL line C header An on-board 5 pin 2.54mm header (CN2) carries the following lines, that can be conveniently used when the main GPIO connector is used to connect other expansion boards: 1.
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Page 10: Software Installation And Configuration
Software installation and configuration Strato Pi Fan can be used with any operating system, programming language or framework compatible with Raspberry Pi. All the features are controlled via standard I C communication on the primary I C bus (i2c-1). Our Strato Pi Fan kernel module for the Raspberry Pi OS (formerly Raspbian) provides for easy usage via sysfs files, without the need to implement the underlying I C protocol. - Page 11 Using Strato Pi Fan The fan is directly controlled by the on-board temperature sensor. It is activated when the measured temperature exceeds the configured TEMP_ON threshold value and, once active, it is deactivated when the temperature goes below the configured TEMP_OFF threshold value.
- Page 12 THRESHOLDS ADDR BYTE 1 BYTE 0 TEMP_OFF TEMP_ON Register 2 Bit 15-7 TEMP_OFF: Temperature threshold for deactivating the fan. 11-bit 2’s complement signed value with 0.5 °C resolution. Default value 0x4B00 (75°C). Register 3 Bit 15-7 TEMP_ON: Temperature threshold for activating the fan. 11-bit 2’s complement signed value with 0.5 °C resolution.
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Page 13: Thermal Considerations
Thermal considerations The thermal effects of the Strato Pi Fan are affected by several factors, including the external environment conditions, the enclosure, and the CPU and electrical loads. In general terms, the fan will significantly increase the airflow inside the enclosure, and improve heat transfer away from the CPU and the other nearby components on the Raspberry Pi board. - Page 14 FAN ON FAN OFF FAN ON DIN-RAIL ENCLOSURE - 20C AMBIENT TEMPERATURE - 100% CPU LOAD Under the same external conditions, but with the CPU constantly at 100% load (on all cores), the beneficial effect of Strato Pi Fan are even more significant. With the fan running, the CPU never comes close to the throttling temperature, operating at approximately 70 °C instead of 85 °C.
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Page 15: Circuit Schematic
Circuit schematic STRATO PI FAN CIRCUIT SCHEMATIC Strato Pi Fan User Guide... -
Page 16: Technical Specifications
Technical specifications Power supply 3.3 V, 5 mA 5.0 V, 130 mA max. (fan on) Fan speed 9100 RPM Fan airflow 4.9 CFM Fan noise 23.6 dBA Temperature accuracy ±2 °C Dimensions (W x D x H) 50 x 45 x 10 mm Operating temperature -20…+70 °C Storage temperature... -
Page 17: Installation And Use Restrictions
Disposal Waste Electrical & Electronic Equipment (Applicable in the European Union and other European countries with separate collection systems). This marking on the product, accessories or literature indicates that the product should not be disposed of with other household waste at the end of their working life. To prevent possible harm to the environment or human health from uncontrolled waste disposal, separate these items from other types of waste and recycle them responsibly to promote the sustainable reuse of material resources. - Page 18 This device complies with the essential requirements of the following directives and harmonised standards: ✓ 2011/65/EU and 2015/863/EU - Restriction of the use of certain hazardous substances in electrical and electronic equipment (RoHS). Strato Pi Fan User Guide...
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