DS2482S-800+T&R - 8-Channel 1-Wire Master | Maxim Integrated
部品番号: DS2482S-800+T&R ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $15.35 | $15.35 |
| 10 | $13.8 | $138.00 |
| 100 | $11.95 | $1,195.00 |
| 500 | $10.4 | $5,200.00 |
| 1,000 | $9.25 | $9,250.00 |
DS2482S-800+T&R 概要
An I2C-to-1-Wire bridge is a specialized protocol converter IC that sits between a microcontroller's I2C bus and one or more 1-Wire slave peripherals (such as DS18B20 temperature sensors, DS2401 serial numbers, or iButtons). It offloads the strict 1-Wire timing requirements - including the reset/presence pulse sequence, byte-level time slots, and strong pull-up timing - from the host MCU, allowing the host to communicate with 1-Wire devices through simple I2C register reads and writes. The DS2482S-800 variant specifically integrates eight independent 1-Wire I/O channels, enabling a single bridge to manage up to eight separate 1-Wire buses, which is critical in systems that need isolated sensor networks.
Key features include an operating supply voltage of 2.9 V to 5.5 V, internal factory-trimmed timers that relieve the host processor of timing-critical tasks, three binary address inputs that resolve I2C slave-address conflicts, and built-in weak pull-ups to support 1-Wire parasitic-power devices. The device is rated for an operating temperature range of -40 C to +85 C, making it suitable for industrial environments.
The DS2482S-800 uses an I2C slave interface with selectable addresses (0x18-0x1F) and exposes each 1-Wire channel through independent IO pins (IO0-IO7). An internal active pull-up handles the strong pull-up required for parasite-powered 1-Wire devices during temperature conversion or EEPROM writes, while per-channel slew-rate control and software-controlled 1-Wire timing parameters ensure signal integrity across varying bus lengths.
Typical applications include multi-channel DS18B20 temperature monitoring in HVAC, server farm, and industrial-process-control systems; building-automation sensor networks; and any embedded design that needs to read multiple 1-Wire devices without dedicating a full GPIO port to bit-banging the 1-Wire protocol.
When designing with this device, note that each 1-Wire channel needs a decoupling capacitor close to its IOx pin and a 4.7 kohm pull-up to VDD. Unused IOx pins may be left floating because internal pull-ups hold them high. The I2C address is set by the AD0/AD1/AD2 pins and must match the host firmware configuration.
This page synthesizes distributor pricing, same-family alternatives, and practical design notes not found in the manufacturer datasheet.
ドロップイン代替品: DS2482S-800+T&R — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
DS2482S-800+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
DS2482S-800/T&R
✅ ドロップイン📋 参考代替品（カタログ未掲載）
DS2482S-800+TR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
DS2482S-800+T&R 仕様
| 機能 | I2C-to-1-Wire Bridge |
| Number of 1-Wire Channels | 8 |
| Host Interface | I2C (Standard 100 kHz / Fast 400 kHz) |
| I2C Slave Address Range | 0x18 to 0x1F (3 binary address inputs) |
| Supply Voltage (VDD) | 2.9 V to 5.5 V |
| Supply Voltage (Nominal) | 3.3 V / 5 V |
| 動作温度 | -40 C to +85 C |
| パッケージ | 16-pin SO (SOIC-Narrow-16) |
| Package Code | S16 |
| 実装タイプ | Surface Mount |
| Internal Pull-up on 1-Wire IOx | Yes (weak pull-up, strong-pull-up via active mode) |
| Parasitic Power Support | Yes |
| RoHS ステータス | Compliant |
| Lead-Free | Yes |
| MSLレベル | 1 (unlimited floor life at <30 C / 85% RH) |
| Packing Quantity (Tape & Reel) | 2500 pcs |
DS2482S-800+T&R ピン構成
| ピン 1 | IO0 — 1-Wire I/O channel 0 |
| ピン 2 | IO1 — 1-Wire I/O channel 1 |
| ピン 3 | IO2 — 1-Wire I/O channel 2 |
| ピン 4 | IO3 — 1-Wire I/O channel 3 |
| ピン 5 | GND — Ground |
| ピン 6 | IO4 — 1-Wire I/O channel 4 |
| ピン 7 | IO5 — 1-Wire I/O channel 5 |
| ピン 8 | IO6 — 1-Wire I/O channel 6 |
| ピン 9 | IO7 — 1-Wire I/O channel 7 |
| ピン 10 | AD2 — I2C slave address bit 2 (tie to GND or VDD) |
| ピン 11 | AD1 — I2C slave address bit 1 (tie to GND or VDD) |
| ピン 12 | AD0 — I2C slave address bit 0 (tie to GND or VDD) |
| ピン 13 | SDA — I2C serial data |
| ピン 14 | SCL — I2C serial clock |
| ピン 15 | VDD — Positive supply (2.9 V to 5.5 V) |
| ピン 16 | NC — Not connected (per datasheet) |
主な用途
DS2482S-800+T&R の用途: 6 件s: Multi-Channel DS18B20 Temperature Monitoring, Industrial Process Control and HVAC Sensor Networks, Building Automation and Smart Thermostats, Server Rack and Datacenter Environmental Monitoring, Cable Identification and Asset Tracking, Medical and Laboratory Multi-Sensor Instruments.
Multi-Channel DS18B20 Temperature Monitoring
The DS2482S-800+T&R drives up to eight separate 1-Wire buses, each populated with DS18B20 temperature sensors. Each IOx pin delivers the reset/presence pulse, read/write time slots, and active strong pull-up required for parasite-powered temperature conversion, while the I2C master on the host side reads converted values through simple register reads. This lets a single MCU monitor 50+ temperature points using only two I2C wires plus eight IOx lines, ideal for server farm intake monitoring where isolated 1-Wire branches limit cable capacitance per bus and improve conversion reliability.
おすすめ
Industrial Process Control and HVAC Sensor Networks
Industrial PLCs and HVAC controllers use the DS2482S-800+T&R to read 1-Wire sensors (temperature, humidity via DS2438, or identification via DS2401) across factory floors. The eight IOx channels let one bridge serve multiple machine zones without needing GPIO bit-banging, and the 2.9 V to 5.5 V supply tolerates noisy 24 V-bus-derived rails with adequate headroom. The -40 C to +85 C operating range matches industrial enclosure specifications, and the 16-pin SO footprint simplifies assembly on standard SMT lines.
おすすめ
Building Automation and Smart Thermostats
Smart thermostats and building-automation hubs leverage the DS2482S-800+T&R to scan multiple floors or zones from one I2C port. Each IOx bus can carry a chain of DS18B20 sensors for room/duct temperature plus DS2417 RTC timekeeping chips for scheduling. The three AD0/AD1/AD2 address pins allow up to eight bridges on one I2C bus, scaling to 64 zones without additional GPIO, and the active pull-up handles parasite-power conversion during HVAC damper calibration sequences.
おすすめ
Server Rack and Datacenter Environmental Monitoring
Datacenter operators use the DS2482S-800+T&R to read inlet/outlet temperatures on every rack via DS18B20 chains hanging off each IOx channel. Eight channels per IC minimize component count on the management card, and the I2C interface simplifies firmware that polls dozens of sensors in sequence. The active strong pull-up ensures parasite-powered DS18B20 conversions complete reliably even when dozens of devices convert simultaneously during peak load events.
おすすめ
Cable Identification and Asset Tracking
Cable-identification systems in telecom and aerospace use the DS2482S-800+T&R to read DS2401 silicon serial numbers from each cable end. Eight IOx channels let one bridge scan eight independent harnesses, returning unique 64-bit IDs that map to cable position in a connector. The small 16-pin SO package fits on compact scan modules, and the I2C interface integrates directly with existing inventory-management MCUs.
おすすめ
Medical and Laboratory Multi-Sensor Instruments
Laboratory instruments and compact medical devices use the DS2482S-800+T&R to consolidate multiple 1-Wire sensors (temperature, identification, calibration tags) onto one I2C bus. The 2.9 V to 5.5 V supply simplifies battery-powered designs, and the eight channels reduce MCU pin count when board space is constrained. The industrial-grade -40 C to +85 C range supports autoclave or refrigerated environments encountered in diagnostic equipment.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: DS2482S-800+T&R — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | DS2482S-800+ | DS2482S-800/T&R | DS2482S-800+TR |
|---|---|---|---|---|
| Brand | Analog Devices (formerly Maxim Integrated) | Analog Devices | Analog Devices | Analog Devices |
| Package | 16-pin SO (SOIC-Narrow-16) | 16-pin SO (SOIC-Narrow-16) - same | 16-pin SO (SOIC-Narrow-16) - same | 16-pin SO (SOIC-Narrow-16) - same |
| Number of 1-Wire Channels | 8 | 8 | 8 | 8 |
| Supply Voltage | 2.9 V to 5.5 V | 2.9 V to 5.5 V | 2.9 V to 5.5 V | 2.9 V to 5.5 V |
| I2C Address Range | 0x18 to 0x1F | 0x18 to 0x1F | 0x18 to 0x1F | 0x18 to 0x1F |
| Packaging | Tape & Reel (T&R) | Tube | Tape & Reel (no lead-free + suffix) | Tape & Reel (lead-free +TR code) |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Parasitic Power Support | Yes | Yes | Yes | Yes |
主な差別化要因
- Eight independent 1-Wire channels on one IC （vs DS2482S-100 (single-channel 8-pin SOIC))
- Factory-trimmed timers relieve host MCU （vs Host-bit-banged 1-Wire on GPIO)
- Selectable I2C address for multi-bridge expansion （vs Fixed-address I2C 1-Wire bridges)
設計ノート
Power DS2482S-800 from a clean 2.9 V to 5.5 V rail with a 100 nF decoupling capacitor placed within 3 mm of the VDD pin and a 10 uF bulk capacitor on the supply node. When driving parasite-powered DS18B20 sensors during temperature conversion, the IC draws additional current through the strong pull-up - ensure the LDO can supply at least 100 mA peak per active channel. Estimated: with 8 channels converting simultaneously, peak supply current can briefly reach 200 mA; budget LDO headroom accordingly.
Place a 4.7 kohm pull-up resistor on each active IOx pin close to the DS2482S-800; unused IOx pins can be left floating per the Maxim EngineerZone FAQ because internal weak pull-ups hold them high. Keep 1-Wire traces short (<30 cm) and avoid routing them parallel to high-speed signals or switching regulators to minimize coupling. Each IOx bus should have its own ground return path back to the IC's GND pin to reduce ground bounce during strong pull-up activation.
Do not connect multiple IOx pins together - each channel is independent and tying them together causes bus contention and unreliable 1-Wire communication. The AD0/AD1/AD2 address pins must be tied hard to GND or VDD (do not leave floating), because the sampled address at power-up locks the I2C slave address. Also, ensure the SDA and SCL lines have external pull-ups (typically 4.7 kohm to VDD) since the DS2482S-800 does not include internal I2C pull-ups.
コンプライアンス情報
RoHS compliant per DigiKey and Mouser product listings. Lead-free as indicated by '+' suffix. Not AEC-Q100 qualified - contact Maxim for automotive variants. Halogen-free status not explicitly stated in the verified web data.
