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©UniSwarm 2021 - UUC1PI

2021/05/19 UDS5001A 1

UUC1PI

Hardware datasheet

Raspberry HAT with CAN Fd, RS485 and

Real-Time Clock

Description

UUC1PI product line is an HAT (Hardware Attached on

Top) module for Raspberry PI.

It provides a Real Time Clock, a RS485 communication, a

CAN communication and in option an improved power sys-

tem for the PI.

Features

• Compatible with Raspberry PI Zero/2/3/4

• Real time clock

• CAN and RS-485 communication

• Compatibility with CAN Open protocol

• Optional 6.5-55V power supply

Interfaces

• CAN Fd bus up to 8 Mbds

• RS485 / RS422 interface (up to 50 Mbds) for protocols

like Modbus, Proﬁbus or DMX512...

• 1 kV isolation between power-side and interface-side

Reference Platform Input Voltage

RTC

RS485

CAN Fd

Isolated

UUC1PIFR

Raspberry PI Zero/2/3/4 6.5 V - 55 V 1 1 1

UUC1PIFR-I 1000V

Summary of content (11 pages)

PAGE 1
UUC1PI Hardware datasheet Raspberry HAT with CAN Fd, RS485 and Real-Time Clock Description Features UUC1PI product line is an HAT (Hardware Attached on Top) module for Raspberry PI. It provides a Real Time Clock, a RS485 communication, a CAN communication and in option an improved power system for the PI. • Compatible with Raspberry PI Zero/2/3/4 • Real time clock • CAN and RS-485 communication • Compatibility with CAN Open protocol • Optional 6.
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Contents Page 1 Specifications 1.1 Technical data . . . . . . . . . . 1.2 Electrical . . . . . . . . . . . . . 1.2.1 Power input . . . . . . . 1.2.2 Buses . . . . . . . . . . 1.2.3 Raspberry PI connection 1.2.4 Real Time Clock (RTC) . 1.2.5 Leds . . . . . . . . . . . 1.3 Drawings . . . . . . . . . . . . . 1.4 Installation . . . . . . . . . . . . 1.4.1 Driver . . . . . . . . . . 1.4.2 CAN Fd . . . . . . . . . 1.4.3 Enable I2C . . . . . . . . 1.4.4 RS485 . . . . . . . . . . 1.4.5 Horloge RTC . . . . . . 1.4.
PAGE 3
Chapter 1 Specifications 1.1 Technical data Electrical Power supply voltage ESD protection 6.5 V - 55 V 30 kV Interfaces CAN RS-485 Isolation max 8 Mbit/s max 50 Mbit/s 1 kV Physical Operating temperature Dimensions (L x W) Mounting 0řC...+85řC 65.1 mm x 56.1 mm 4 mounting holes for M2.5 screws Figure 1.
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1.2 Electrical UUCPI have 4 connectors. J103 power in. J201 CAN/RS485 J102 RPI GPIO J203 CAN/RS485 Figure 1.2: UUC1PI connectors 1.2.1 Power input There are two different possibilities to power the UUC. • From the PI via the GPIO port : The UUC is powered by the PI through the 5V GPIO Pin. This method can be use for every UUC it just needs to be plug on the PI. • From an external power supply via the UUC external power in : The PI is powered by the HAT through the 5V GPIO Pin.
PAGE 5
1.2.2 Buses Both buses (RS485 and CAN Fd) have 30 kV Electrostatic Discharge (ESD) protection and high quality filters for noisy environment. A full 1kV isolation is present between bus-side and power-side to prevent damage and avoid noise to propagate through the bus. Each bus had a 120 Ohm terminaison resistor that can be welded thank to a dedicated jumper (JP204 for RS-485 and JP203 for CAN). Both buses are link to the RJ45 connector and a jumper (JP201) can select which one is on the J201 connector.
PAGE 6
1.2.3 Raspberry PI connection The UUC use the Raspberry PI connectivity and have the J104 connector on the back of the board that must be connected with the 40 GPIO port of the Raspberry PI. This port is compatible with Pi Zero/Zero W/ Zero WH/2B/3B/3B+/4 The UUC board uses some of the GPIO: • One of the SPI buses is used for the communication between the Raspberry PI and the CAN module. • The I2C bus is used for the communication between the Raspberry PI and an EEPROM memory.
PAGE 7
1.2.4 Real Time Clock (RTC) The UUC can provide a Real Time Clock and Calendar with the following information : • Seconds • Minutes • Hours • Day of Week • Day • Month • Year The module can be configured using the I2C communication. Thanks to a a 3V CR1225 battery, the RTC can keep time even in case of main power failure. 1.2.5 Leds There are 2 leds on the UUC board: • One to indicate that the card is powered. • The other one that can be activated with the PI GPIO.
PAGE 8
1.3 Drawings Maximum height (UUC only) : 23.00 mm Maximum height with PI4 : 32.00 mm 1.4 1.4.1 Installation Driver Install driver : unzip mcp2518fd_module_pi4b.zip -d path cd mcp2518fd_module_pi4b sudo ./install.sh 1.4.2 CAN Fd Set baud rate You can set the baud rate: sudo ip link set can0 type can bitrate 1000000 sudo ip link set can0 up 1.4.
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Select Interfacing Options → I2C → YES to enable the I2C driver by kernel. Then you can check if the I2C is enabled: lsmod If I2C enabled, the terminal echoes an i2c-bcm2708 device. Else you can also add it manually. sudo nano /etc/modules append: i2c-bcm2708 i2c-dev 1.4.4 RS485 Open the terminal and modify config.txt file by commands: sudo nano /boot/config.
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Appendix A Hardware revision history Version Date Change v1.0.1 v1.0.
PAGE 11
Appendix B Datasheet revision history Revision Date Change A 2020/10/15 Initial public revision ©UniSwarm 2021 - UUC1PI 2021/05/19 UDS5001A 11