The Maxim 3-wire interface is found on the DS1620 and some other ICs from Maxim The data flow to and from the DS1620 is multiplexed on only one pin (DQ) while SPI needs two separate signals (MOSI, MISO).
App Note 085: Interfacing the DS1620 to the Motorola SPI Bus
App Note 501: Interfacing 3-Wire Real-Time Clocks With A Microcontroller - Dallas Semiconductor offers a variety of serial Real Time Clocks (RTCs). A number of these use a 3-wire interface to communicat with a microprocessor. This application note is intended to help customers understand the basics of the 3-wire interface.
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