TCAN1043-Q1: TCAN1043 power consumption

Hi Alan,

The electrical characteristics from section 7.7 of the datasheet are over the recommended operating temperature of -55 to 125 C. Communication speed does not affect power consumption as much as the percent of overall time the bus is in the dominant or recessive state. The CAN bus may not always be in a dominant state.

If you have a reasonable assumption or measurement of the percentage of time the bus is in the dominant state then you could calculate power as shown below.

P = [(1-D) * IREC * VCC] + [D * IDOM * (VCC-VOD)]

Where:

• P is power
• D is percentage of the time the bus is in a dominant state
• IREC is the current consumption from VCC in a recessive state
• VCC is the supply of the transceiver
• IDOM is the current consumption from VCC in a dominant state (you could use with fault here)
• VOD is the output differential voltage of the bus in a dominant state (the termination resistance consumes some power from VCC)

Are you using VIO or VSUP for your design? Using VIO and VSUP will also affect your power consumption as well.

Please let us know if you have any other questions.

Respectfully,

Brandon Young