SINGLE WIRE BUS INTERFACE FOR MULTIDROP APPLICATIONS

摘要

A data communications between multiple devices (220, 230, 300) over a single wire bus interface (240). This single-wire interface can be used for sensors, amplifiers, analog-to-digital converters or any other circuit which would normally have an electrical output. Advantages include reduced pin count and reduced board layout complexity. Each slave device (220, 230, 300) coupled to the single-wire bus interface (240) is assigned a different response time window (T01-T0n). This enables multiple slave devices (220, 230, 300) to respond to an initial trigger signal (Tstart) generated by a master device (210) without overlapping response. A slave electronic device (220, 230, 300) includes application circuitry providing state information for the electronic device (220, 230, 300), an input output pin (370) suitable for making an electrical coupling external to the electronic device (220, 230, 300), and a single wire bus interface (240) coupled to the input output pin (370) and the application circuitry. The single wire bus interface (240) has conversion function circuitry (380) defining a specific response time window (T01-T0n) for the electronic device (220, 230, 300).