DS2482S-800

DS2482S-800 is an 8-channel I2C-to-1-Wire master from Maxim (now Analog Devices). It lets a single microcontroller drive up to eight independent 1-Wire buses, with all timing and signaling handled by the device.
Key features
- 8 independent 1-Wire channels on one I2C device
- I2C interface (typical 100 kHz or 400 kHz)
- Supports standard and overdrive 1-Wire speeds
- 1-Wire ROM commands (Read ROM, Match ROM, Skip ROM, Search ROM)
- Reset/Presence detect, data timing, and integrity handling
- Per-channel strong pull-up for parasite-powered devices
- Status/FAULT reporting and basic bus management
How it works
- MCU communicates over I2C, selects a channel, and issues 1-Wire commands. The DS2482S-800 handles the low-level 1-Wire timing and drive signals, including strong pull-up when needed.
Applications
- Multi-sensor networks (e.g., multiple DS18B20s), iButton systems, and any design needing several 1-Wire buses with one MCU. Benefits: fewer MCU pins, simpler wiring, and reliable bus control.

Direct equivalents: None besides the DS2482-800 family. DS2482S-800 is the RoHS/lead-free version of Maxim’s 8-channel I2C-to-1-Wire master (DS2482-800). No other vendors offer an exact 8-channel equivalent. Closest alternatives: DS9490R (USB-to-1-Wire) and DS2480B (UART-to-1-Wire).

Here are the key features of the DS2482S-800 (8‑port, I2C to 1‑Wire master):
- 8 independent 1‑Wire buses controlled from a single I2C interface.
- Integrated 1‑Wire master engine: reset/presence detect, ROM commands (SEARCH ROM, READ ROM, MATCH ROM, SKIP ROM), and data transfer (READ/WRITE bytes).
- Strong pull‑up per channel for parasite‑powered 1‑Wire devices; per‑channel power delivery control.
- I2C interface up to 400 kHz; standard 7‑bit I2C addressing; channel selection via control registers.
- Supports multi‑bus 1‑Wire operations from one device, reducing MCU I/O.
- Wide supply range: typically 2.8–5.5 V; operating temperature −40°C to +85°C.
- Low power/standby characteristics with per‑channel control to optimize energy use.
- Package options suitable for embedded applications (pinout suitable for I2C connection and channel control).
Note: exact pinout/package options may vary by package variant; consult the latest datasheet for the precise electrical characteristics and register/command set.

- Pin count: 8 pins (8-pin package such as SOIC/MSOP)
- Function: I2C-to-1-Wire master/bridge. Provides a single 1-Wire bus controlled via I2C, implementing 1-Wire reset/presence detect and data transfer, with support for strong pull-up for parasite-powered devices.

Manufacturer: Analog Devices, Inc. (the DS2482S-800 originated with Maxim Integrated, which ADI acquired in 2020).
What kind of company: A multinational semiconductor company that designs and manufactures analog, mixed-signal, and digital signal processing integrated circuits.

DS2482S-800 is an 8-channel I2C-to-1-Wire master. It lets a microcontroller manage eight independent 1-Wire buses through one device, enabling multi-point sensing and data access with minimal I/O.
Typical applications:
- Multi‑point temperature sensing and data logging (DS18B20, DS18S20)
- 1‑Wire memory devices and iButton inventory (DS2432, etc.)
- Asset tracking and distributed sensing in industrial, building automation, HVAC/energy management
- Telecom and other systems requiring many 1‑Wire devices on a single MCU
In short: scalable, multi-bus 1‑Wire interfacing for complex sensor networks.

DS2482S-800 comes in an 8-pin SOIC (SOP-8) package.