I have an application where I would like to control the ADS7280 with just a simple 4-wire SPI interface (SCLK,SDI,SDO,CS). In other words, I would like to initiate acquisition and conversion sequences through the SPI interface only, without using the CONVST input (always pulled high) for manual triggering or without synchronizing SPI reads to the EOC output in auto-triggering mode. Is this possible? I'm hoping I could effectively achieve this by programming the device to use the external SCLK for the conversion reference and carefully counting/controlling my SCLKs. Any suggestions are much appreciated. Thanks.