Analog Devices Inc. ADT75ARM

Overview

ADT75ARM from Analog Devices is a ±1°C accurate, 12-bit digital temperature sensor in an 8-pin MSOP package, delivering 0.0625°C resolution and SMBus/I²C interface compatibility for embedded thermal monitoring. It operates from −55°C to +125°C at 3 V to 5.5 V supply, features programmable overtemperature alert (OS/ALERT), and supports up to eight devices on one bus - used in computer thermal protection and industrial process control.

For engineers reviewing the ADT75ARM datasheet, ADT75ARM pinout, ADT75ARM application, or ADT75ARM equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply support for thermal sensing designs requiring precision, low power, and I²C scalability.

Technical Context

The ADT75ARM uses a first-order Σ-Δ modulator with bandgap temperature sensor and internal voltage reference to achieve 12-bit effective accuracy without user calibration. Its conversion engine performs automatic 100 ms interval measurements with 60 ms conversion time, storing results in a read-only 16-bit temperature register using two's complement format.

It implements SMBus/I²C-compatible serial communication with open-drain SDA/SCL pins, addressable via A0–A2 (up to 8 devices), and configurable OS/ALERT output operating in comparator or interrupt mode with programmable hysteresis (THYST) and overtemperature (TOS) setpoints.

Key Specifications

Pinout & Package

ADT75ARM is housed in an 8-pin MSOP (RM-8) package with exposed pad for thermal performance; footprint matches industry-standard 8-lead SOIC but with 3.0 mm × 3.0 mm body size and 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital temperature sensing applications.

Compared with LM75BIMM, ADT75ARM delivers 4× higher resolution and tighter accuracy for thermal safety-critical systems; versus ADT7410TRZ, it trades resolution for lower power and simpler register mapping - making it optimal for cost-performance balanced embedded thermal management.

Availability

ADT75ARM is available at Aetrix Electronics and suitable for computer thermal monitoring, industrial process control, and thermal protection applications requiring stable component supply, long-lifecycle availability, and guaranteed B-grade accuracy.

Supply support for ADT75ARM 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

Analog Devices is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The ADT75ARM belongs to Analog Devices' precision temperature sensor product line, designed specifically for embedded systems needing reliable, low-power, I²C-compatible thermal monitoring with factory-trimmed accuracy and minimal external components.

FAQ

What is the guaranteed accuracy specification for ADT75ARM across its full operating temperature range?

The ADT75ARM is specified as B grade with ±1.0°C accuracy from 0°C to +70°C, ±2.0°C from −25°C to +100°C, and ±3.0°C from −55°C to +100°C. These values are tested and guaranteed per Analog Devices Rev. 0 datasheet Tables 1 and 2. The ADT75ARM maintains 0.0625°C resolution across its entire −55°C to +125°C operating range, though absolute accuracy degrades outside the 0°C–70°C window.

Does ADT75ARM support true drop-in replacement for LM75-based designs?

Yes - the ADT75ARM is explicitly stated in its datasheet (Page 3, General Description) to be pin and register compatible with the LM75 and AD7416. All address pins (A0–A2), I²C interface timing, register map (including default THYST/TOS values), and OS/ALERT behavior match. No PCB or firmware changes are required beyond updating the part number and verifying supply voltage compliance.

How does the one-shot mode function in ADT75ARM, and what is the minimum delay before reading temperature?

In one-shot mode (enabled by setting Bit D5 in the configuration register), the ADT75ARM powers down completely until a write to address 0x04 (one-shot register) triggers a single conversion. After writing to 0x04, a minimum 60 ms delay is required before reading the result - matching the documented conversion time. The ADT75ARM returns the same value whether read from the one-shot register (0x04) or the temperature value register (0x00).

What is the maximum number of ADT75ARM devices that can share a single I²C bus, and how is addressing configured?

Up to eight ADT75ARM devices can operate on a single SMBus/I²C bus. Addressing is controlled by three logic inputs: A0, A1, and A2. Each pin accepts GND or VDD to set individual bits of the 7-bit slave address, yielding eight unique addresses from 0x48 to 0x4F. This configuration is detailed in the Pin Function Descriptions (Page 8) and Register Map (Page 13) of the ADT75ARM datasheet.

Can ADT75ARM operate reliably at 3.3 V supply while maintaining its ±1°C B-grade accuracy specification?

Yes - the ADT75ARM's B-grade ±1°C accuracy from 0°C to +70°C is fully guaranteed at VDD = 3.0 V to 5.5 V, including 3.3 V operation. Figure 5 (Page 9) confirms temperature error remains within ±1°C across the 0°C–70°C range at both 3.3 V and 5 V. Power consumption at 3.3 V is 200 μA average (normal mode) and 3 μA typical (shutdown), as verified in Tables 1 and 2.