The Serial Peripheral Interface (SPI) is a synchronous serial communication interface used for short distance communication, usually between devices on a printed circuit board (PCB) assembly. The TMAG5170D-Q1 supports a 4-wire SPI. The primary communication between the device and the external microcontroller is through the SPI bus that provides full-duplex communication. The external microcontroller works as the SPI controller that sends command requests on the SDI pin and receives device responses on the SDO pin. The TMAG5170D-Q1 device works as the SPI peripheral device that receives command requests and sends responses (such as status and measured values) to the external microcontroller over the SDO line. The TMAG5170D-Q1 supports a fixed 32-bit frame size to communicate with a controller device. However, the 32-bit frame can be configured through DATA_TYPE register bits to support a regular single register read data packet, or a special packet to read two-channel data simultaneously.