Communication and interconnect · Application solutions

CAN / CAN FD

Transceivers, signal isolation and bus protection. Part of the "Communication and interconnect" group, which runs from PHYs and switching to industrial buses and pairs each chip with a matching port design.

Contact an FAE →

Typical application circuits

Circuit approaches and matching VOOHU parts, organized by application scenario.

CAN-01

Classic CAN transceiver circuit

The CAN transceiver connects the MCU's CAN controller to the bus. Design the termination, filtering and protection for the actual network.

MCU CAN controller
CAN transceiver
Termination and bus port

Industrial control
PV and energy storage
Power grid

Core chips (vendor documentation)

TCAN1042HTI · CAN / CAN FD transceiver
CAN transceiver. Its data rate capability depends on the specific suffix.
TCAN1042H product page ↗

Matching VOOHU parts

WHAC-3225B-201U4Signal line common-mode choke · inductance 200μHMore signal line common-mode chokes →
WHALD30E2BBidirectional ESD protection device · 30V, 0.9pF, SOT23 packageMore bidirectional ESD protection devices →

Design checklist

Verify the supply, the dominant and recessive levels, and the fault states separately.
Decide whether to fit the common-mode choke based on measured waveforms.
Check I/O levels and standby control against the full orderable part number.
Set the termination resistors for the nodes and cable, and run bit-error tests.

CAN-02

CAN FD timing and port design

Design the loop delay, termination and filtering for the specific transceiver suffix and the target data-phase bit rate.

MCU CAN FD controller
CAN FD transceiver
Termination and differential bus

Industrial control
PV and energy storage

Core chips (vendor documentation)

TCAN1042HTI · CAN / CAN FD transceiver
CAN transceiver. Its data rate capability depends on the specific suffix.
TCAN1042H product page ↗

Matching VOOHU parts

WHAC-3225B-201U4Signal line common-mode choke · inductance 200μHMore signal line common-mode chokes →
WHALD30E2BBidirectional ESD protection device · 30V, 0.9pF, SOT23 packageMore bidirectional ESD protection devices →

Design checklist

TCAN1042H versions differ in maximum data rate. Check the specific suffix.
Check the loop delay separately for the arbitration-phase and data-phase bit rates.
Check stubs, leakage inductance and ringing by measurement at the target data rate.
Add filter parts to the BOM only after measurements confirm them.

CAN-03

Isolated CAN and matching power supply

The isolated CAN transceiver provides signal isolation. Power for the isolated side comes from a separate push-pull isolated supply circuit.

MCU
Isolated CAN transceiver
Bus; separate isolated supply

Industrial control
PV and energy storage
Power grid

Core chips (vendor documentation)

ISO1042TI · Isolated CAN transceiver
CAN transceiver with integrated signal isolation.
ISO1042 product page ↗
SN6505BTI · Push-pull transformer driver
Push-pull transformer driver for small isolated power supplies.
SN6505B product page ↗

Matching VOOHU parts

WHST06Q02E0Push-pull transformer · 86μH, 1:2.88, 2500VACMore push-pull transformers →
WHALD30E2BBidirectional ESD protection device · 30V, 0.9pF, SOT23 packageMore bidirectional ESD protection devices →

Design checklist

Mark the signal isolation boundary and the power isolation boundary separately.
Confirm by measurement that the push-pull transformer matches the SN6505B.
Check the transformer parameters against the drive frequency.
Check isolation spacing and parasitic capacitance, and test CMTI and EMI.

CAN-04

CAN port EMC and fault protection

The filter and protection network sits between the bus and the transceiver pins. Its values are bounded by the transceiver's common-mode range and fault tolerance.

Bus transients/noise
Filter and protection network
Transceiver pins

Industrial control
PV and energy storage
Power grid

Core chips (vendor documentation)

TCAN1042HTI · CAN / CAN FD transceiver
CAN transceiver. Its data rate capability depends on the specific suffix.
TCAN1042H product page ↗
ISO1042TI · Isolated CAN transceiver
CAN transceiver with integrated signal isolation.
ISO1042 product page ↗

Matching VOOHU parts

WHAC-3225B-201U4Signal line common-mode choke · inductance 200μHMore signal line common-mode chokes →
WHALD30E2BBidirectional ESD protection device · 30V, 0.9pF, SOT23 packageMore bidirectional ESD protection devices →

Design checklist

Record the communication waveforms both before and after adding protection and filtering.
A general-purpose common-mode choke does not provide signal isolation.
Check the common-mode choke impedance, leakage inductance and TVS clamping voltage.
Test waveforms under bus fault modes and under ESD, EFT and surge conditions.

Chip part numbers are taken from the vendors' public documentation and are for selection reference only. Check matching VOOHU parts against your project parameters before use.

Standard reference designs for this solution area are being prepared and will be listed on this page once published. For circuit and part selection support, contact a VOOHU FAE.

Need help selecting parts for your project?

Send the chip model, interface data rate, and power and protection requirements to a VOOHU FAE to check the peripheral parts against a reference design.

Contact an FAE →

CAN / CAN FD

Typical application circuits

Classic CAN transceiver circuit

Core chips (vendor documentation)

Matching VOOHU parts

Design checklist

CAN FD timing and port design

Core chips (vendor documentation)

Matching VOOHU parts

Design checklist

Isolated CAN and matching power supply

Core chips (vendor documentation)

Matching VOOHU parts

Design checklist

CAN port EMC and fault protection

Core chips (vendor documentation)

Matching VOOHU parts

Design checklist

Need help selecting parts for your project?

Related solution areas

Please fill in your contact information and inquiry