3-wire interface and One-Shot mode
The 3-wire interface (CLK, DQ, RST) is a simple serial protocol — not I²C or SPI, so your firmware needs a bit-banged or dedicated GPIO driver. It uses three lines: a clock, a bidirectional data line, and a chip-select reset. The One-Shot feature lets you initiate a single conversion and read the result, then the sensor goes into a low-power state until the next command. This cuts average supply current significantly in systems that only need temperature data every few seconds — think battery-backed data loggers or wireless sensor nodes.
Lifecycle and sourcing
The DS1620S+T&R carries an Active lifecycle status and is ROHS3 compliant. It remains a viable BOM line for both new designs and production spares.