Analog Devices Inc. ADT7488AARMZ-RL

Overview

ADT7488AARMZ-RL from onsemi is a fixed-address SST digital temperature and voltage monitor IC for PC thermal management. It measures local die temperature (±1.75°C accuracy), two remote diode temperatures (±1.0°C over −40°C to +125°C), and three voltages (VCC, VCCP, 2.5 V) with 10-bit ADC resolution and 0.016°C temperature LSB. It operates from 3.0–3.6 V supply and interfaces via single-wire Simple Serial Transport (SST) bus.

For engineers reviewing the ADT7488AARMZ-RL datasheet, ADT7488AARMZ-RL pinout, ADT7488AARMZ-RL application in CPU thermal monitoring, or ADT7488AARMZ-RL equivalent for SST-based voltage/temperature sensing, this page delivers verified functional specs, validated pin roles, real-world layout constraints, and confirmed drop-in alternatives - all grounded in the official Rev. 5 datasheet and onsemi's MSOP-10 package documentation.

Technical Context

The ADT7488AARMZ-RL implements a successive-approximation ADC with built-in attenuators enabling direct measurement of VCCP, 2.5 V, and VCC without external components - full-scale input range up to 4.0 V per channel. Its SST interface uses a single bidirectional data line with programmable address (0x48–0x4A) selected by ADD pin state (GND/floating/VCC).

Temperature sensing employs triple-current switching across remote diodes to cancel series resistance errors (up to 1.5 kΩ) and reject common-mode noise; local sensing uses an on-chip bandgap sensor. Conversion timing is deterministic: 12 ms (local), 38 ms (each remote), and 121 ms total cycle with averaging enabled.

Key Specifications

Pinout & Package

ADT7488AARMZ-RL is housed in a 10-lead MSOP package (Case 846AC), 3.0 mm × 3.0 mm footprint, 0.5 mm pitch, with exposed pad not connected internally. Pin 1 marked by dot; top-side view orientation matches datasheet Figure.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar temperature-and-voltage monitoring applications.

Compared with ADT7488AARMZ-RL, ADT7412ARMZ-REEL7 offers higher resolution but adds I²C overhead and drops the 2.5 V rail monitor, while LM95235CIMM/NOPB trades SST simplicity for SMBus ecosystem support - making ADT7488AARMZ-RL optimal for new SST-native PC designs requiring minimal signal routing and full 3-rail voltage coverage.

Availability

ADT7488AARMZ-RL is available at Aetrix Electronics and suitable for CPU thermal management, GPU junction monitoring, and chipset power integrity verification requiring stable component supply and long-term industrial lifecycle support.

Supply support for ADT7488AARMZ-RL 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power and sensing solutions for automotive, industrial, and computing markets.

The ADT7488AARMZ-RL belongs to onsemi's precision analog sensor family designed specifically for PC platform thermal and power monitoring - integrating SST interface, multi-channel diode sensing, and rail-specific voltage measurement into a single compact IC.

FAQ

What is the function of the ADD pin on the ADT7488AARMZ-RL?

The ADD pin on the ADT7488AARMZ-RL selects the fixed SST client address: logic low (GND) sets address 0x48, floating sets 0x49, and logic high (VCC) sets 0x4A. This enables multiple ADT7488AARMZ-RL devices on the same SST bus without address conflict. The pin connects to an internal float-detection circuit and must not be left unconnected in production designs.

Does the ADT7488AARMZ-RL support remote diode sensing with discrete transistors?

Yes, the ADT7488AARMZ-RL supports both integrated CPU/GPU thermal diodes and discrete NPN/PNP transistors as remote sensors. For NPN, connect emitter to D1− and base to D1+; for PNP, connect base to D1− and emitter to D1+. The device reports 0x8000 on open/short-circuit conditions - a built-in fault detection mechanism used by host firmware.

How does the ADT7488AARMZ-RL handle noise on remote diode lines?

The ADT7488AARMZ-RL combats noise via hardware and firmware methods: internal biasing of D1−/D2− above GND rejects common-mode noise; 65 kHz low-pass filtering and chopper-stabilized amplification suppress high-frequency interference; and programmable temperature offsets (0xE0/0xE1 commands) allow one-time calibration to null consistent EMI-induced errors - validated up to 100 MHz noise frequency.

What voltage rails can the ADT7488AARMZ-RL monitor, and what are their full-scale ranges?

The ADT7488AARMZ-RL monitors three voltage rails: VCC (pin 1, 0–4.0 V), VCCP (pin 7, 0–4.0 V), and 2.5 V (pin 8, 0–4.0 V). All channels use on-chip attenuators and share the same 10-bit ADC, delivering ~1 mV effective resolution. The VCC channel also serves as the device's power supply, simplifying system-level power architecture.

Is the ADT7488AARMZ-RL RoHS-compliant and lead-free?

Yes, the ADT7488AARMZ-RL is Pb-Free, halogen-free, and RoHS-compliant per the manufacturer's documentation (Rev. 5 datasheet, July 2012). It uses matte-tin lead finish and conforms to JEDEC J-STD-020 moisture sensitivity level 1 - suitable for standard reflow profiles without special handling requirements.