SBAS940 December 2018 DAC8742H
The DAC8742H implements both SPI and UART interfaces. Only one interface is active at a time for the DAC8742H. The interface mode is selected by the IF_SEL pin: a logic high on this pin sets the device to SPI mode and a logic low sets the device to UART mode. An internal pull-down resistor is included to ensure power-up in a known state, by default the pull-down sets the interface to UART mode. If changing I/O modes after power-up, a reset command should be issued on RST.