SLLA636A June   2024  – August 2024 TCAN3403-Q1 , TCAN3404-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 25V CAN Transceiver
  6. 3TI's TCAN3403-Q1, TCAN3404-Q1 CAN FD Transceivers
  7. 4Interoperability (IOPT) of TCAN340x-Q1
  8. 5 EMC of TCAN340x-Q1
  9. 6 Benefits of TCAN340x-Q1 over competition 3.3V CAN offerings
  10. 7Conclusion
  11. 8Revision History

2 5V CAN Transceiver

As shown in Figure 2-1, for the driver to produce a minimum differential voltage of 1.5V across the CAN high and CAN low terminals, high- and low-side transistors (highlighted in the dotted-red rectangle in Figure 2-1) must be sized appropriately so that the maximum drop across them is 3V when operating from a 4.5V supply (since the main 5V supply can vary by ±10%).

CAN Transceiver Block Diagram Figure 2-1 CAN Transceiver Block Diagram

The CAN bus transceiver may be the only 5V component in the subsystem. With the modern MCU’s I/O supply going down to 3.3V, it is possible to eliminate the 5V rail altogether, resulting in power-stage simplification and cost savings by reducing the bill of materials and PCB space. A high bus-fault-tolerant CAN bus transceiver that is footprint-compatible to standard 5V CAN transceivers, and that operates from a single 3.3V supply, can help simplify designs and reduce cost by eliminating the need for a dedicated 5V supply.

Table 2-1 5V CAN Transceiver Specifications
Parameter Conditions Min (V) Max (V)
VCANH Dominant output, Bus load 50 Ω ≤ RL ≤ 65 Ω 2.75 4.5
VCANL 0.5 2.25