Analog Devices Inc./Maxim Integrated DS2483R+T

Overview

DS2483R+T from Maxim Integrated is a single-channel I²C-to-1-Wire bridge IC that functions as a self-timed 1-Wire master, supporting both standard (15.4 kbps) and overdrive (125 kbps) communication speeds, adjustable timing parameters (tRSTL, tMSP, tW0L, tREC0), active/strong pullup control, and software-controllable 1-Wire port power-down - deployed in medical instruments, industrial sensors, and printers for reliable parasitic-power 1-Wire device interfacing.

For engineers reviewing the DS2483R+T datasheet, DS2483R+T pinout, DS2483R+T application, or DS2483R+T equivalent, key selection considerations include dual-voltage operation (I²C side: 1.8V/3.3V/5.0V; 1-Wire side: 3.3V–5.0V), ±8kV HBM ESD protection on IO, sleep mode current of 3.0 µA at 3.6V, and support for up to 400 kHz I²C bus speed with no external crystal required.

Technical Context

The DS2483R+T implements a hardware-based 1-Wire controller with dedicated input/output logic, internal oscillator, and configurable timing registers - eliminating host CPU involvement in time-critical waveform generation. It uses a single internal pullup transistor for both active pullup (fixed-duration low-impedance rise) and strong pullup (sustained conduction for EEPROM copy or SHA operations).

Its register architecture includes four accessible I²C-mapped registers: Device Configuration (APU/PDN/SPU/1WS bits), Status (PPD/SD/1WB/SBR/DIR), Read Data, and Port Configuration (adjustable tRSTL/tMSP/tW0L/tREC0/RWPU). The SLPZ pin enables hardware sleep entry independent of I²C activity, and the device maintains high-impedance IO during sleep.

Key Specifications

Pinout & Package

DS2483R+T is packaged in an 8-pin TDFN (2mm × 3mm, exposed pad) with thermal and electrical grounding via the EP pad. Pin compatibility matches the DS2483 family's standardized layout for drop-in replacement across voltage and timing variants.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar I²C-to-1-Wire bridge applications.

Compared with DS2483R+T, DS2482-100+ offers lower cost but sacrifices overdrive speed, strong pullup, and timing adjustability - limiting use to simple sensor networks. MAX31826ATM+ embeds sensing but removes I²C flexibility and sleep capability, making it unsuitable as a drop-in replacement for general 1-Wire bridging.

Availability

DS2483R+T is available at Aetrix Electronics and suitable for medical instrumentation, industrial sensor networks, and printer subsystems requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.

Supply support for DS2483R+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and digital ICs for industrial, medical, and communications applications - emphasizing reliability, integration, and low-power operation.

The DS2483R+T belongs to Maxim's 1-Wire interface product line, engineered specifically to simplify robust, low-cost connectivity to 1-Wire sensors, memories, and security devices in resource-constrained embedded systems.

FAQ

What is the maximum 1-Wire bus capacitance supported by the DS2483R+T?

The DS2483R+T supports 1-Wire bus capacitance up to 400 pF, as verified by its tF1 (fall time) specification of ≤1 µs under standard speed with 10–400 pF load. This enables reliable operation on extended cables or multi-drop configurations typical in industrial sensor networks. Exceeding 400 pF may violate timing margins for tW0L and tREC0, especially at overdrive speed. For higher capacitance, reduce tW0L/tREC0 via Port Configuration or add repeater stages.

Does the DS2483R+T require an external crystal or resonator?

No, the DS2483R+T does not require an external crystal or resonator. It integrates a precision internal oscillator that generates all 1-Wire timing signals - including tRSTL, tMSP, tW0L, and tREC0 - with typical accuracy sufficient for full-speed 1-Wire communication. Oscillator warm-up time after power-on or wake-up is specified as 2 ms (tOSCWUP/tSWUP), after which full timing compliance is guaranteed.

How does the DS2483R+T handle 1-Wire short detection?

The DS2483R+T detects 1-Wire shorts during the presence-detect cycle at tSI (sampling time), setting the SD bit in the Status register. When SD = 1, the PPD bit is forced to 0, preventing false presence interpretation. The device distinguishes shorts from valid interrupt signals (e.g., DS2404) only by timing - so DS2404/DS1994 interrupt functionality must be disabled in shared-bus applications. Recovery requires a subsequent 1-Wire Reset command after short removal.

Can the DS2483R+T operate with different supply voltages on its I²C and 1-Wire interfaces simultaneously?

Yes, the DS2483R+T supports independent supply domains: the I²C interface voltage (VCI2C) is set by the SLPZ pin and can be 1.8V, 3.3V, or 5.0V, while the 1-Wire interface operates from 3.3V–5.0V referenced to VCC. This built-in level translation allows a 1.8V microcontroller to communicate with 5V 1-Wire EEPROMs or sensors without external translators - confirmed by Electrical Characteristics tables showing VIH1/VIL1 referenced to VCC and VIH/VIL on SCL/SDA referenced to VCI2C.

What happens to the 1-Wire bus when the DS2483R+T enters sleep mode via the SLPZ pin?

When SLPZ is pulled low, the DS2483R+T enters sleep mode and places its IO pin in high-impedance state, effectively disconnecting the 1-Wire bus from the master. The RWPU resistor is disabled, and no active or strong pullup is applied. If downstream 1-Wire devices are parasitically powered, they lose VDD and reset; if externally powered, they remain operational but cannot communicate until DS2483R+T wakes and re-enables the port via PDN bit clear.