Analog Devices Inc./Maxim Integrated MAX31826MUA+T

Overview

MAX31826MUA+T from Maxim Integrated is a 1-Wire digital temperature sensor with integrated 12-bit ADC, ±0.5°C accuracy from -10°C to +85°C, -55°C to +125°C operating range, and 1Kb lockable EEPROM. It operates in parasite-power mode (no VDD required) or local power mode, and supports multidrop bus topology via unique 64-bit ROM ID for industrial thermal monitoring.

For engineers reviewing the MAX31826MUA+T datasheet, MAX31826MUA+T pinout, MAX31826MUA+T application, or MAX31826MUA+T equivalent, key selection considerations include 1-Wire interface simplicity, EEPROM lockability, AD0–AD3 location address inputs, parasitic vs. local power trade-offs, and strong-pullup timing requirements during conversion.

Technical Context

The MAX31826MUA+T implements a 1-Wire slave interface with open-drain DQ pin, requiring only one data line plus ground. Its internal architecture integrates a precision bandgap temperature sensor, 12-bit sigma-delta ADC, scratchpad RAM, and 128-byte EEPROM with CRC-8 protection and hardware lock capability.

It supports two power modes: parasite power (VDD grounded, power drawn from DQ via CPP capacitor) and local VDD supply. Parasite mode mandates external strong pullup activation within 10µs of Convert T command, lasting ≥150ms; local power eliminates this requirement and enables concurrent bus traffic during conversion.

Key Specifications

Pinout & Package

MAX31826MUA+T is housed in an 8-pin µMAX® package (3mm × 3mm, 0.5mm pitch), RoHS-compliant and moisture-sensitive level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 1-Wire temperature sensing applications.

Compared with DS18B20+T and MAX31820MUA+, the MAX31826MUA+T uniquely combines 1-Wire simplicity with lockable EEPROM and hardware location encoding-making it optimal for systems requiring tamper-resistant calibration storage and scalable multidrop topology without host-side address management.

Availability

MAX31826MUA+T is available at Aetrix Electronics and suitable for industrial temperature monitoring, building automation systems, and consumer appliance thermal safety requiring stable component supply and long-term lifecycle support.

Supply support for MAX31826MUA+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 power management ICs for industrial, automotive, and communications markets.

The MAX31826 belongs to Maxim's 1-Wire sensor family, engineered specifically for low-wire-count, multidrop thermal measurement in space- and cost-constrained embedded systems.

FAQ

What power supply options does the MAX31826MUA+T support?

The MAX31826MUA+T supports two power configurations: local VDD supply (3.0V–3.7V) or parasite power drawn from the DQ line. In parasite mode, VDD must be grounded, and a strong pullup must be activated within 10µs of issuing Convert T or Copy Scratchpad 2 commands. The MAX31826MUA+T's dual-mode flexibility simplifies design in both wired infrastructure and ultra-compact sensor nodes.

How does the MAX31826MUA+T enable multidrop 1-Wire bus operation?

The MAX31826MUA+T implements a unique 64-bit ROM code (family code 0x3B) and supports four pin-programmable address inputs (AD0–AD3), allowing up to 16 distinct physical locations per bus segment. Combined with 1-Wire ROM commands like Search ROM and Match ROM, the MAX31826MUA+T enables deterministic addressing of dozens of sensors on a single data line-eliminating manual configuration and enabling scalable thermal networks.

What is the purpose and behavior of the MAX31826MUA+T's lockable EEPROM?

MAX31826MUA+T integrates 128 bytes (1Kb) of EEPROM for storing calibration data, device identifiers, or system parameters. Once locked via the appropriate command sequence, the EEPROM becomes permanently read-only-preventing accidental or malicious modification in deployed systems. Data retention exceeds 40 years at +85°C, ensuring long-term reliability in sealed or inaccessible installations containing the MAX31826MUA+T.

What timing constraints apply during temperature conversion on the MAX31826MUA+T?

At 12-bit resolution, MAX31826MUA+T requires 150ms for full temperature conversion. In parasite-power mode, a strong pullup must be enabled on the DQ line within 10µs of issuing the Convert T command and held for the entire conversion duration. Failure to meet this timing causes incomplete conversion or communication failure. Local VDD operation removes this constraint and allows concurrent bus activity during conversion-critical for real-time systems using the MAX31826MUA+T.

Can the MAX31826MUA+T operate reliably above 100°C?

The MAX31826MUA+T is rated for operation from -55°C to +125°C, but parasite-power mode is not recommended above +100°C due to increased leakage currents that may disrupt bus communication. For high-temperature applications (e.g., motor windings, industrial ovens), use local VDD supply to ensure robust 1-Wire signaling. The MAX31826MUA+T's ±0.5°C accuracy remains valid across its full range when powered locally, making it suitable for demanding thermal validation tasks.