DS2405 is a 1-Wire addressable switch device from Maxim. It features a 64-bit registration number and a single data pin, and can communicate on a 1-Wire bus.
The DS2405 Addressable Switch is an open‑drain N‑channel MOSFET with a unique 64‑bit laser‑engraved registration number that provides both identification and remote switching over a 1‑Wire bus. It operates from parasite power supplied by the bus and supports a wide voltage range (2.8 V to 6.0 V) and temperature range (‑40 °C to +85 °C).
The document includes pin assignments for TO‑92, SOT‑223, and 6‑pin TSOC packages, ordering information, detailed 1‑Wire protocol commands, electrical specifications, and absolute maximum ratings. It also describes hardware configuration, bus master circuitry, and timing parameters for reliable communication.
| Supply Voltage (Vpup) | 2.8 V to 6.0 V |
|---|---|
| PIO Pin Sink Capability | >4 mA at 0.4 V |
| Data Pin Capacitance | 800 pF |
| PIO Pin Capacitance | 10 pF |
| Maximum 1‑Wire Data Rate | 16.3 kbits/s |
| Reset Low Time | 480 µs to 960 µs |
The device derives its power entirely from the 1‑Wire bus (parasite power) using an external pull‑up voltage.
The 1‑Wire bus supports up to 16.3 kbits/s.