SLLU388 November   2024

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1  Power Requirements
    2. 2.2  Setup
      1. 2.2.1 Power Management Setup
      2. 2.2.2 Transceiver Options
      3. 2.2.3 Special Use Pin Options
      4. 2.2.4 Potential Board Modifications
    3. 2.3  Header, Jumper, and other Interface Information
    4. 2.4  Switch Information
    5. 2.5  Resistor Information
    6. 2.6  Inductance Information
    7. 2.7  Capacitor Information
    8. 2.8  Diode Information
    9. 2.9  Transistor Information
    10. 2.10 IC and Misc. Component Information
  9. 3Software
    1. 3.1 Software Description
    2. 3.2 Software Installation
    3. 3.3 Software Development
    4. 3.4 Programming Options
  10. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layouts
    3. 4.3 Bill of Materials (BOM)
  11. 5Additional Information
    1. 5.1 Trademarks
    2. 5.2 Related Documentation

2.1 Power Requirements

The TCAN284XEVM only requires a single power input to power on the entire board for 5V, but it should be noted that the SBC requires 3 separate power inputs, VSUP (device), VCAN (CAN bus), and VHSS (High Side Switch supply). The suggestion is to allow up to 1A to 1.5A of power depending on use case of the integrated LDOs and LDO controller. Power can be applied at J3, which is a barrel jack that can accept between 4.5V and 28V, power can also be applied across headers J4 which bypasses the barrel jack located at J3. If the end user wants to test the reverse polarity protection no action is necessary after placing power connection, at J3 or J4; however, as a bypass, shunt header J1. Power can also be applied directly to ICs VSUP pin through J5 which inherently bypasses battery EMI filter and reverse polarity protection. To power the high side switch supply, VHSS, the end user can apply a separate voltage to J6 pin 2, or the user can shunt J6 pin 2 to VSUP (also located on J6) to power VHSS with VSUP (a relatively standard implementation of this pin). The VCAN pin depends on the device soldered down for U1. J9 pin 2 is the breakout connection for the VCAN pin. The pin can be shunted to either the external 5V LDO U3 (if enabled) or VCC2 for a 5V source, this guidance applies for any device variant. If the end user is using a 5V SBC (TCAN28XX5), the user can also attach a jumper wire from VCC1 (located at J19) to power VCAN.

Only VSUP is required for the board to operate. Everything except CAN and HSS source is powered through the VSUP pin. If HSS and CAN, testing must be performed.

Beyond device power there is an external LDO, U3, that is used in up to three ways on the board. The first is to supply a source voltage for indicator LED driving. The second is to provide a bias voltage for the SW pin if pulled up. Finally, U3 can be used to power VCAN. To enable U3, J12 must not be left floating and either shunt J12 pin 2 to pin 1 or pin 3 (VSUP or VCC2) for the enable signal. For current measurement tests, the best option is to leave J12 floating to prevent the LDO from drawing current during testing. This comes at the cost of no LED driving and if SW is being pulled high a different pull-up source must be used.

As a first check of the board before any modification, the suggestion is to do the following steps:

  1. Apply 4.5V to 28V source to J3 or J4. If using 4.5V source shunt J1 to remove the diode drop. Keep this supply off at the moment.
  2. Shunt VHSS to VSUP through J6.
  3. Shunt J12 pin 2 to either pin 1 or pin 3 on J12 to turn on U3 5V LDO.
  4. Shunt J9 pin 2 to either pin 1 or pin 3 on J9 to power VCAN
  5. Shunt “SW” to “PU” on J23 to hold SW high during power up.
  6. Turn on main supply power. If everything is powered correctly, the power LED indicators light up. Letting the end user know the board is powered properly.