10 Power Supply Recommendations

The TCAN4550-Q1 is designed to operate off of the battery V_bat. It has internal regulators to reduce the voltage to acceptable low power levels supporting the CAN FD controller, CAN transceiver and low voltage CAN receiver. In order to support a wide range of microprocessors the SPI and GPIO are powered off of the V_IO pin which supports levels from 3 V to 5.5 V. Bulk capacitance, should be placed on the V_SUP and the V_IO voltage rails where system requirements are met. It is recommended that a capacitance of a 100 nF is placed near the TCAN4550-Q1 V_SUP and the V_IO supply terminals. The FLTR terminal requires a minimum of 300 nF capacitance to ground to regulate the internal digital power rail. V_CCOUT needs a minimum capacitance to ground of 10 µF at the terminal.