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POWER SUPPLY?
ramzi92552014

ramzi92552014

@copilot POWER SUPPLY?
2y

copilot

For your project that involves the MCP2515 CAN controller (U1) and the MCP2551 CAN transceiver (IC1), a suitable power supply needs to provide voltages that match the requirements of these components. Both the MCP2515 and MCP2551 operate with a supply voltage ($V_{DD}$) typically at 5V. Here are the power supply considerations for each component:
  • MCP2515T-I/SO (U1): According to its datasheet, it has an operating voltage range from 2.7V to 5.5V. It's important to provide a clean and stable 5V supply to ensure proper operation, especially in noisy environments typical of CAN networks.
  • MCP2551-I/P (IC1): This CAN transceiver also operates with a supply voltage in the range of 4.5V to 5.5V, making a 5V supply the ideal choice.
Given the common voltage requirements, a simple approach would be to use a single 5V power supply for both components. If you are designing a system that will be powered from USB, this becomes straightforward as USB provides a 5V supply. Alternatively, if you are working with batteries or a different voltage source, you will need a voltage regulator to step down/up the voltage to 5V.
Recommendation:
  • Use a 5V regulated power supply.
  • To ensure stability and protect against voltage spikes, connect bypass capacitors near the power supply pins of both components. A typical value is 100nF for each IC, placed as close to the $V_{DD}$ and ground pins as possible. Additionally, it can be beneficial to add a bulk capacitor (e.g., 10µF) near the power source.
Example Connection:
  • Connect a 5V power supply to U1:18 ($V_{DD}$) and IC1:3 ($VDD$).
  • Connect the ground of your power supply to U1:9 ($VSS$) and IC1:2 ($VSS$).
If you need guidance on selecting a specific type of voltage regulator or have other power supply-related questions, feel free to ask!
2y
4
how do I connect IC1 and U1?
ramzi92552014

ramzi92552014

@copilot how do I connect IC1 and U1?
2y

copilot

To connect the MCP2551 CAN transceiver IC1 (MCP2551-I/P) to the MCP2515 CAN controller U1 (MCP2515T-I/SO) in your project, you'll need to ensure proper communication and power lines are connected. Here's a suggested connection scheme based on typical CAN bus configurations and the pins you've provided:
Power Connections:
  • VDD/VSS (Power Supply): Ensure both IC1 and U1 are powered correctly. Assuming a common 5V power supply for simplicity:
    • Connect IC1:3 (VDD) to U1:18 (VDD).
    • Connect IC1:2 (VSS) to U1:9 (VSS).
CAN Bus Communication:
  • CANH/CANL (Differential Pair): These are the physical wires for the CAN bus. Your design will connect to other CAN bus nodes through these lines:
    • Connect IC1:6 (CANL) to your CAN bus network's low side.
    • Connect IC1:7 (CANH) to your CAN bus network's high side.
Transceiver to Controller Communication:
  • TXD/RXD (Transmit and Receive Data): Connect the MCP2551 transmit and receive lines to the corresponding MCP2515 lines to enable data flow between the transceiver and the controller:
    • Connect IC1:1 (TXD) to U1:14 (SI).
    • Connect IC1:4 (RXD) to U1:15 (SO).
Additional Connections and Assumptions:
  • Reference Voltage (VREF): Generally used for stabilizing or testing; can be left unconnected if not in use.
  • Receive/Transmit Operating Mode (RS): It determines the operation mode of IC1. To operate in high-speed mode, this can be tied to ground. Depending on your specific needs (e.g., low-power mode), you would connect it differently:
    • For high-speed mode, connect IC1:8 (RS) to IC1:2 (VSS).
  • Reset: Ensure U1 can be properly reset for initial configurations or in case of error:
    • Connect U1:17 (~RESET) to your microcontroller's reset output if controlled, or to VDD with a pull-up resistor if it should stay enabled.
Here are the connections in the specified format for clarity:
  • Connect IC1:3 to U1:18 (Shared VDD).
  • Connect IC1:2 to U1:9 (Shared VSS).
  • Connect IC1:1 to U1:14 (TXD to SI).
  • Connect IC1:4 to U1:15 (RXD to SO).
  • For high-speed mode: Connect IC1:8 (RS) to IC1:2 (VSS).
Please note the considerations for RS and ~RESET pins; you may adjust based on your specific use case and other components in your system. Let me know if you've got any specific requirements or if there's anything else you'd like to add!
2y
3
U1
Not Recommended for New Designs
IC1

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