This document describes a product with open drain PIO pins that can be controlled and their logic level can be determined over 1-Wire bus for closed-loop control. It replaces and is fully compatible with DS2407 but has no user-programmable power-on settings and no Hidden Mode.
The Maxim DS2406 is a dual‑addressable switch with a 1 Kb user‑programmable OTP EPROM and open‑drain PIO pins that can be controlled and monitored over a 1‑Wire bus. It provides unique 64‑bit laser‑etched ROM IDs for error‑free selection and supports conditional search, parasite power operation, and optional external VCC supply.
The manual details pin assignments, memory map, status memory functions, and command protocols for reading, writing, and extended memory access. It also describes power requirements, programming voltage, and CRC verification for reliable data transfer.
| PIO‑A sink capability | 50 mA at 0.4 V |
|---|---|
| PIO‑B sink capability | 8 mA at 0.4 V |
| Maximum operating voltage | 13 V (PIO‑A) / 6.5 V (PIO‑B) |
| User‑programmable memory | 1024 bits OTP EPROM |
| Unique ROM ID | 64‑bit laser‑etched registration number |
| 1‑Wire data rate | up to 15.4 kbits/s |
| Operating temperature range | -40 °C to +85 °C |
The DS2406 can operate up to 13 V on the PIO‑A channel and 6.5 V on the PIO‑B channel.
The device can derive all required power from the 1‑Wire bus using parasite power stored on an internal capacitor.
The DS2406 provides 1024 bits of one‑time programmable EPROM for user data.
Each device contains a unique 64‑bit laser‑etched ROM registration number.