MC33664 Transformer Interface NXP Semiconductor MC33664 Transformer Interface is designed conveniently to interface a microcontroller to a high-speed isolated communication network. The MC33664 transformer interface operates at a supply voltage of 4.5V to 7V and dual SPI interface and input control. The MC33664 devices provide 2.0Mbps isolated network communication rate and compatible with 3.3V to 5V logic thresholds. Features include high-precision current measurement ( ±1500A) with low resolution, low sleep mode current, and ultra-low radiated emissions. Applications include automotive and industrial applications. Automotive applications are high-voltage battery management systems (>,800V) and industrial applications are Energy Storage Systems (ESS), E-bikes, and E-scooters.