DS2431+

DS2431+ is Maxim’s enhanced 1-Wire EEPROM memory device (DS2431 family). It provides nonvolatile user data storage on a single 1-Wire bus, plus a built-in 64‑bit ROM ID for bus addressing. The device can be powered from VDD or parasitically from the data line; writes typically require a strong pull-up.
Key features
- 1-Wire interface with standard ROM commands (Read ROM, Match ROM, Skip ROM) and memory commands (Read Memory, Write Memory, Read Scratchpad, Copy Scratchpad)
- Scratchpad usage to safely stage data before copying to main memory
- Unique ROM code enables multiple devices on one bus
- Nonvolatile memory for configuration, authentication, or logging
- CRC support on the bus for data integrity
Getting started
- Use a 1-Wire master (MCU with OneWire library or a USB dongle)
- Connect bus, VDD and GND (or use parasite power with proper pull-ups)
- Address the device by its ROM ID and perform Read/Write operations per the datasheet
For exact memory size and command details, consult the DS2431+ datasheet.

DS2431+ is a 1‑Wire serial EEPROM memory (iButton style). Key features:
- 1‑Wire interface; parasite-power capable (also supports external VDD).
- Memory size: 1 Kbit (128 bytes) of EEPROM.
- 64‑bit unique ROM ID for device addressing.
- Scratchpad memory (8 bytes) to stage writes before committing to memory.
- Page write capability (typically 8‑byte pages) with atomic copy from scratchpad to memory.
- Random and sequential read support.
- CRC-8 data integrity on 1‑Wire data transfers.
- Endurance about 1,000,000 write cycles; data retention > 10 years.
- Operating range roughly −40°C to +85°C; supply 2.8–5.5 V.
- Packaging options suitable for iButton or standard 8‑pin styles; simple 1‑Wire integration.
Note: exact page sizes and protected regions may vary by revision; check datasheet for specifics.

- Pin count: 3 pins (GND, VDD, DQ)
- Function: 1‑Wire 1‑Kbit nonvolatile EEPROM (1‑Wire memory) accessed via the 1‑Wire protocol on the DQ line; can be powered parasitically or from VDD.

- Manufacturer: Maxim Integrated Products (originally Dallas Semiconductor).
- What kind of company: An American semiconductor company that designs and manufactures analog, mixed-signal, and memory integrated circuits (now a subsidiary of Analog Devices).

DS2431+ is a 1-Wire nonvolatile memory with security features for identification and data storage. Typical application areas include:
- Product authentication and anti-counterfeiting
- Unique ID, traceability, and warranty/recall data for manufacturing and supply chains
- Secure provisioning of cryptographic keys, certificates, or firmware IDs (supporting secure boot)
- Calibration, configuration data, and sensor data logging in embedded systems
- Asset tracking and smart tagging
- IoT device provisioning and secure key storage for access control and licensing
These use cases leverage its nonvolatile storage, small form factor, and secure-identity capabilities.

DS2431+ is packaged as an iButton: a two-lead cylindrical cylindrical metal can (Dallas/Maxim iButton format).