Strato Pi CM v3

Name: Strato Pi CM v3
SKU: 4509
Availability: InStock

Compact industrial Raspberry Pi Compute Module server with eMMC Flash, RS-485, wide-range power supply, RTC, watchdog and secure element. CE/FCC/IC compliant and UL listed.

From €178.00 + tax

Raspberry Pi CM version

Raspberry Pi OS pre-installed

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SKU: N/A Categories: Control Units, Edge Computing Servers, Industrial PC, Industrial Raspberry Pi Tags: Energy Management, Environmental Control, Fleet Management, Home and Building Automation, Iot and IIoT, Multi-Protocol Gateways

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Description

A compact industrial Raspberry Pi

Strato Pi CM is an extremely powerful and compact industrial server based on Raspberry Pi Compute Module, suitable for use in industrial and professional applications where reliability and service continuity are key requirements.

It is compliant with the low voltage and EMC CE directives, as well as the harmonised standards for electromagnetic compatibility, electrical safety, emission and the RoHS directive for hazardous substances. It is also UL listed and compliant with the applicable FCC rules and IC standards.

Features

Mounting:

2 modules DIN rail case
power supply and serial connections on pluggable terminal block

Power supply:

9-28Vdc power supply, with surge and reverse polarity protection, and 1.1A resettable fuse
up to 1.9A max continuous current (3A peaks) to the 5V Raspberry Pi Compute Module power supply input pins (at 24Vdc)

Connectivity:

standard RS-485 interface to the Raspberry Pi serial line, with opto-isolator and electrostatic discharge protection
2 x USB 2.0 type-A ports, with individual power control and fault detection
10/100 Ethernet port

Storage:

embedded Raspberry Pi Compute Module eMMC flash memory (8, 16, or 32 GB)

High reliability and security:

hardware watchdog, fully independent from the Raspberry Pi Compute Module, controlled via GPIO
real time clock (RTC) with replaceable back-up battery
embedded Microchip ATECC608 secure element chip
integrated boot loader for the Strato Pi micro-controller, allowing in-field firmware upgrades directly from the Raspberry Pi

More:

GPIO-controlled LED
LEDs for power supply and serial line activity
recessed push-button, hidden behind the front-panel, connected to a GPIO pin

Highlights

Power Supply

A high quality and stable power supply is extremely important to ensure reliable operation of your Raspberry Pi for continuous 24/7 loads in harsh industrial environments.

Strato Pi CM accepts a wide power supply range and is able to effectively handle substantial amounts of ripple, noise and supply voltage fluctuations. The power supply stage is a heavily protected and filtered circuit, using oversized electrolytic capacitors, diodes and inductors, and a high efficiency voltage regulator.

The step-down converter is based on advanced, high-output-current PWM converter integrated circuits with low resistance MOSFET, with approximately 95% efficiency and up to 1.9A continuous output current (3A peak). It includes over current limiting, over voltage protection and thermal shutdown.

The power supply stage is also protected from reverse polarity with resettable fuses. Surge protection up to ±500V/2ohms 1.2/50μs ensures reliability in harsh environments.

Real Time Clock

The Raspberry Pi relies on Internet time servers to set its internal clock to the current date and time on start-up. If your applications always requires the correct time, even when not connected to the Internet, then you need to have a local real time clock/calendar to permanently keep track of time, even when the Raspberry Pi is off.

Strato Pi CM features a battery-backed real time clock/calendar, directly connected to the Raspberry board through the I2C bus interface. The automatic switch-over to a lithium battery guarantees the functionality of the RTC when its main power supply fails.

The real time clock is based on the PCF2131 general purpose RTCC chip from NXP. It is connected to the Raspberry Pi’s I2C bus and, besides the standard clock function, it has several other advanced features.

A replaceable CR1025 battery is used as a backup power source when the main power is not available. If Strato Pi CM is always powered, the battery should last well over 10 years.

RS-485

RS-485 serial ports are widely used to connect devices in industrial automation and other applications. The Raspberry Pi lacks the circuitry to implement these protocols. While many USB adapters are available at reasonable price, they are usually not heavily protected and isolated.

The interface circuits of the RS-485 serial ports on Strato Pi CM are insulated from the power supply voltages, thus avoiding possible failures due to ground loops.

The insulation is obtained by means of a high efficiency isolated DC-DC converter and three hi-speed opto-couplers.

A micro-controller automatically manages the data direction of RS-485, taking into account the baud rate and the number of bits, without any special configuration. The Raspberry board can therefore communicate through its TX/RX lines without any other additional signal.

Hardware Watchdog

A hardware watchdog is an electronic circuit that can reset the processor if, for any reason, the software application appears to be stuck. An automatic hardware restart after a software hang can save your day, particularly on unattended applications that need to work continuously.

Taking advantage of the Strato Pi CM on-board micro-controller, we have implemented a hardware watchdog circuit that can be used, upon a software hang, to reset the Raspberry Pi CM.

The Strato Pi watchdog is completely independent from the Raspberry Pi’s internal CPU watchdog circuit and, being controlled by Raspberry Pi’s GPIO pins, it is extremely easy to control from your application and very effective in recovering from unexpected malfunction.

Mechanical Construction

A standard, modular enclosure is usually a strong requirement in most industrial and professional installations. A bare Raspberry Pi CM can’t be used as-is in these cases.

Strato Pi CM is housed in a compact, standard industrial 2-modules wide DIN case with omega-rail mount. On the upper side, it has a removable 5 positions terminal block, with a 0.15 inch pitch (3.81 mm) for power and serial connections.

Specifications

POWER SUPPLY
Power supply operating voltage (VS)	⎓dc 24 V nominal (range 9-28 V), max 1.1 A Reverse polarity protection with 1.1 A resettable fuse
Current consumption at VS 12 V⎓ including Raspberry Pi CM 3+ Lite, with Ethernet and RS-485 connected, no USB devices	low CPU load: 170 mA 100% CPU load: 410 mA Actual current consumption may vary based on working conditions
Current consumption at VS 24 V⎓ including Raspberry Pi CM 3+ Lite, with Ethernet and RS-485 connected, no USB devices	low CPU load: 100 mA 100% CPU load: 220 mA Actual current consumption may vary based on working conditions
USB1 port output current	500 mA (max)
USB2 port output current	500 mA (max)
RASPBERRY PI COMPATIBILITY
Raspberry platform compatibility	Raspberry Pi Compute Module 1 (not UL evaluated) Raspberry Pi Compute Module 3 (not UL evaluated) Raspberry Pi Compute Module 3+ Raspberry Pi Compute Module 4S
RS-485 INTERFACE
Interface	Half-Duplex with automatic data direction management
Baud rates	1200 to 115200
ESD-Protection Voltage on A, B	±15 kV human body model ±8 kV contact discharge
Surge protection on A, B	Surge protection up to ±500 V / 2 Ohms 1.2/50 μs; 600 W peak pulse power capability at 10/1000 μs waveform
Fail safe feature	Guarantees a logic high receiver output when the receiver inputs are shorted, open, or connected to a terminated transmission line with all drivers disabled
REAL TIME CLOCK
Oscillator frequency	32768 kHz
Frequency Tolerance	±3 ppm
Backup battery	Only use CR1220 Lithium/Manganese Dioxide or BR1220 Lithium Poly-Carbon Monofluoride batteries. UL evaluated models: Renata SA CR1220 MFR Renata SA CR1220 EEMB CO LTD CR1220 EEMB Expected battery life without main power supply: 3 or more years, depending on environmental conditions
ENVIRONMENTAL
Operating temperature	-20…+50 °C CM3+, CM4S extended range: -20…+60 °C (not UL evaluated)
Storage temperature	-30…+80 °C
Humidity	5% to 95% RH noncondensing
Altitude	Up to 2000 m
Protection degree	IP20 (not UL evaluated)
Vibration IEC 60068-2-6 (Test Fc, Operating)	0.7 g @ 5…100 Hz
EMI IMMUNITY STANDARDS
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)
UL CERTIFICATION
UL File E526642	The device is intended to be supplied with limited energy source according to UL 61010-1 3rd Ed, section 9.4 or LPS in conformance with UL 60950-1 or Class 2 in compliance with UL 1310 or UL 1585. All auxiliary input/output ports have been considered as SELV accessible part due to the connection to the only one source of supply described above.
MECHANICAL
Terminal block	Maximum conductor cross section: 1.5 mm² (16 AWG), or 0.5 mm² when using ferrules Recommended stripping length: 5 mm Screw thread: M2 Maximum screws tightening torque: 0.25 Nm
Dimensions	2 module DIN-rail enclosure width: 36.3 mm height: 90.5 mm depth: 62.0 mm
Weight	150 g (including Raspberry Pi Compute Module)