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Analog Devices Inc. ADT7488AARMZ-RL7
- Part No.:
- ADT7488AARMZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADT7488AARMZ-RL7.pdf
- Description:
- TEMP. SENSOR WITH SST INTERFACE
- Quantity:
- Payment:
- Shipping:
Inventory:10,950
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Product details
Overview
ADT7488AARMZ-RL7 from onsemi is a fixed-address SST digital temperature and voltage monitor IC for PC thermal management. It integrates one on-chip temperature sensor, two remote diode inputs (D1±/D2±), and monitors three voltage rails: VCC (3.3 V supply), VCCP (processor core), and 2.5 V. Its 10-lead MSOP package supports SST Rev 1.0 interface with address selection via ADD pin (0x48–0x4A), enabling integration in desktop motherboard VRM monitoring.
For engineers reviewing the ADT7488AARMZ-RL7 datasheet, ADT7488AARMZ-RL7 pinout, ADT7488AARMZ-RL7 application, or ADT7488AARMZ-RL7 equivalent, this page delivers verified technical context, real-world monitoring cycle timing (121 ms total), remote sensor accuracy (±1.0°C at −40°C to +125°C), series resistance cancellation (1.5 kΩ), and SST bus-level timing parameters including tBIT (500 ns) and tHOLD (0.5×tBIT−M).
Technical Context
The ADT7488AARMZ-RL7 implements a 10-bit successive-approximation ADC with built-in attenuators to support full-scale input ranges up to 4.0 V across VCC, VCCP, and 2.5 V channels. It uses a triple-current-switching method on remote diodes to measure ΔVBE, enabling cancellation of series resistance errors up to 1.5 kΩ and rejecting common-mode noise.
Its SST interface operates as a single-bidirectional wire client with fixed target addresses (0x48–0x4A) selected by ADD pin state (low/float/high). Temperature data is reported in 16-bit two's complement format (0.016°C resolution, ±512°C range); voltage data uses same format with ~1 mV resolution over ±32 V range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 3.0–3.6 V - powers device and enables internal VCC monitoring |
| Local Temp Accuracy | ±1.75°C (−40°C to +100°C) - ensures reliable die-temperature tracking for CPU thermal throttling |
| Remote Temp Accuracy | ±1.0°C (−40°C to +125°C, TA = 25°C) - critical for accurate GPU or chipset junction sensing |
| Series Resistance Cancellation | 1.5 kΩ - compensates PCB trace resistance without external calibration |
| Total Monitoring Cycle Time | 121 ms (averaging enabled) - defines minimum polling interval for full local + dual-remote + 3-voltage readout |
| SST Bit Time (tBIT) | 500 ns - sets maximum communication speed on shared SST bus |
| ADC Resolution | 10 bits - provides sufficient granularity for voltage regulation feedback (e.g., VCCP ±10 mV detection) |
Pinout & Package
ADT7488AARMZ-RL7 is housed in a Pb-free 10-lead MSOP (Case 846AC), 3.0 mm × 3.0 mm × 1.0 mm profile, optimized for space-constrained motherboard layouts near CPU VRMs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Power supply & monitored rail | 3.3 V ±10% supply input; also digitized as primary system voltage reference |
| GND (Pin 2) | Ground reference | Analog/digital common return; must be low-impedance for ADC and remote diode bias stability |
| D1+ / D1− (Pins 3/4) | Remote sensor 1 differential input | Accepts NPN/PNP transistor or CPU thermal diode; internal bias diode on D1− rejects ground noise |
| D2+ / D2− (Pins 5/6) | Remote sensor 2 differential input | Independent second remote channel for GPU or chipset die temperature monitoring |
| VCCP (Pin 7) | Processor core voltage input | Monitors high-dynamic CPU rail (up to 4.0 V full scale) with 80–140 kΩ input impedance |
| 2.5 V (Pin 8) | Chipset supply voltage input | Tracks auxiliary 2.5 V rail; shares same ADC path and attenuation as VCCP |
| ADD (Pin 9) | Address select input | Three-state detection (GND/float/VCC) sets SST address to 0x48/0x49/0x4A for multi-device bus operation |
| SST (Pin 10) | Bidirectional SST data line | Single-wire serial interface compliant with SST Rev 1.0; requires 1 kΩ pull-up per specification |
Key Features
| Feature | Design Value |
|---|---|
| Triple temperature sensing | Simultaneous on-die + two remote diode channels enable comprehensive CPU/GPU/chipset thermal mapping |
| Three-rail voltage monitoring | VCC, VCCP, and 2.5 V inputs use shared 10-bit ADC with programmable attenuation-no external resistors needed |
| SST Rev 1.0 compliance | Fixed-address client operation eliminates bus enumeration overhead; supports ping, reset, and DIB identification |
| Remote diode series resistance cancellation | Hardware-based 1.5 kΩ compensation removes trace-resistance-induced error without software calibration |
| Configurable temperature offset | ±128°C offset (0.25°C step) via SST commands 0xE0/0xE1 corrects board-level EMI-induced temperature drift |
Applications
| Desktop Motherboard Thermal Management | CPU VRM Power Monitoring |
|---|---|
|
Use Scenario: Real-time thermal supervision of Intel/AMD CPU packages and companion chipsets on ATX/mATX motherboards. IC Role / Device Role / Timing Role: Primary SST temperature/voltage sensor interfacing directly with baseboard management controller (BMC) or southbridge SMBus-to-SST bridge. Use Value: Enables dynamic fan control and thermal throttling using local + dual-remote readings with <±1.0°C remote accuracy and 121 ms full-cycle update rate. |
Use Scenario: Closed-loop monitoring of processor core voltage (VCCP) and 2.5 V chipset rail during load transients. IC Role / Device Role / Timing Role: Analog front-end for power delivery health reporting; feeds voltage deviation data to VRM controller (e.g., ADP3192) via SST. Use Value: Detects VCCP droop >50 mV or 2.5 V sag >100 mV using 10-bit ADC and built-in attenuators-no external scaling resistors required. |
| Industrial Sensor Net Node | Embedded PC Thermal Safety System |
|
Use Scenario: Distributed temperature sensing across multiple PCBs in factory automation controllers or network appliances. IC Role / Device Role / Timing Role: SST client node on daisy-chained bus; ADD pin configures unique address (0x48–0x4A) for multi-drop topology. Use Value: Supports up to three independent thermal zones per node (local + D1 + D2) with noise-immune differential remote sensing up to 12 ft via twisted pair. |
Use Scenario: Fail-safe thermal shutdown trigger in ruggedized embedded PCs used in transportation or medical devices. IC Role / Device Role / Timing Role: Independent watchdog sensor feeding temperature thresholds to system CPLD/FPGA; operates autonomously from main CPU. Use Value: Delivers guaranteed ±4.0°C accuracy over −40°C to +100°C ambient, with open/short detection (0x8000 flag) on both remote diodes for fault isolation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature-and-voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADT7481ARMZ-REEL7 | Uses SMBus/I²C instead of SST; no remote diode support; monitors only VCC, VCCP, 2.5 V, and local temp | Requires I²C host controller; lacks dual-remote capability for GPU/chipset sensing | Select when existing platform uses I²C and only single-point thermal monitoring is needed |
| LM95245CIMMX-1/NOPB | Supports dual remote diodes and 3 voltage inputs but uses SMBus; ±1.5°C remote accuracy vs. ±1.0°C for ADT7488AARMZ-RL7 | Compatible with standard SMBus masters; no SST bus dependency or address-pin configuration | Choose for drop-in replacement where SST infrastructure is absent and ±0.5°C lower remote accuracy is acceptable |
Compared with ADT7488AARMZ-RL7, ADT7481ARMZ-REEL7 sacrifices remote sensing for I²C compatibility, while LM95245CIMMX-1/NOPB retains dual-remote capability but trades SST simplicity for SMBus protocol overhead and reduced remote accuracy-making ADT7488AARMZ-RL7 optimal for SST-native PC platforms requiring highest remote precision.
Availability
ADT7488AARMZ-RL7 is available at Aetrix Electronics and suitable for desktop motherboard design, CPU VRM validation, and industrial sensor net deployment requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for ADT7488AARMZ-RL7 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 management, analog, sensors, and connectivity solutions for automotive, industrial, and computing markets.
The ADT7488AARMZ-RL7 belongs to onsemi's SST-compatible thermal monitoring product line, designed specifically for PC and embedded systems requiring integrated, low-pin-count temperature and voltage supervision with noise-immune remote diode interfaces.
FAQ
What is the function of the ADD pin on the ADT7488AARMZ-RL7?
The ADD pin on the ADT7488AARMZ-RL7 selects the device's fixed SST target address (0x48, 0x49, or 0x4A) via three-state detection: grounded (0x48), floating (0x49), or pulled high (0x4A). This enables multiple ADT7488AARMZ-RL7 units on a single SST bus without address conflict, supporting scalable thermal monitoring across CPU, GPU, and chipset zones.
Does the ADT7488AARMZ-RL7 support remote diode sensing with discrete transistors?
Yes, the ADT7488AARMZ-RL7 supports both NPN and PNP discrete 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 internal bias diode on D1− lifts the negative terminal above ground to reject ground noise, and optional 1000 pF filtering capacitor (C1) may be added in noisy environments.
How does the ADT7488AARMZ-RL7 handle series resistance in remote diode traces?
The ADT7488AARMZ-RL7 performs hardware-based series resistance cancellation of up to 1.5 kΩ by measuring ΔVBE at three current levels (I, N1×I, N2×I) and solving for temperature independent of lead resistance. This eliminates the need for manual calibration or external compensation networks, ensuring accurate remote readings even with long PCB traces or cable runs.
What is the full-scale voltage range for VCCP monitoring on the ADT7488AARMZ-RL7?
The ADT7488AARMZ-RL7 supports a full-scale input voltage of 4.0 V on the VCCP pin (Pin 7), accommodating typical processor core voltages (e.g., 0.8–1.5 V nominal) with ample headroom for transient overshoot. Input impedance is 80–140 kΩ, and measurement resolution is ~1 mV using its 16-bit two's complement voltage data format.
Can the ADT7488AARMZ-RL7 detect open or short circuits on remote diodes?
Yes, the ADT7488AARMZ-RL7 returns 0x8000 (−32768 decimal) for either GetExt1Temp() or GetExt2Temp() command when the corresponding remote diode is open-circuited or short-circuited. This fault flag is part of the standard 16-bit two's complement temperature data format and enables immediate hardware-level failure detection without additional diagnostic firmware.
ADT7488AARMZ-RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Temp Monitoring System (Sensor)
- Sensor Type:
- Internal and External
- Sensing Temperature:
- -40°C ~ 125°C, External Sensor
- Accuracy:
- ±1.75°C(Max)
- Topology:
- ADC, Multiplexer, Register Bank
- Output Type:
- Simple Serial Transport™ (SST)
- Output Alarm:
- No
- Output Fan:
- No
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
ADT7488AARMZ-RL7 FAQ
1.How can I place an order for ADT7488AARMZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADT7488AARMZ-RL7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADT7488AARMZ-RL7 reliable?
The price and inventory of ADT7488AARMZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT7488AARMZ-RL7 is usually 5 days.
3.What payment methods are accepted for ADT7488AARMZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADT7488AARMZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADT7488AARMZ-RL7?
ADT7488AARMZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADT7488AARMZ-RL7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADT7488AARMZ-RL7?
For technical support, including ADT7488AARMZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT7488AARMZ-RL7 requirements.
6.How does Aetrix verify that ADT7488AARMZ-RL7 is sourced from the original manufacturer or authorized distributors?
All ADT7488AARMZ-RL7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADT7488AARMZ-RL7 meets industry standards.
7.What is the process for return or replacement of ADT7488AARMZ-RL7?
All ADT7488AARMZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADT7488AARMZ-RL7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADT7488AARMZ-RL7 part is unused and in its original packaging.
Return procedure for ADT7488AARMZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADT7488AARMZ-RL7 Tags
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EMC2101-ACZL-TR
Microchip Technology
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MCP9844T-BE/MNY
Microchip Technology
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EMC2101-R-ACZL-TR
Microchip Technology
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MCP98244T-BE/MNY
Microchip Technology
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TC670ECHTR
Microchip Technology
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SE98ATP,547
NXP Semiconductors
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AMC6821SDBQR
Texas Instruments
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MAX6604AATA+T
Analog Devices Inc./Maxim Integrated
-
ADT7475ARQZ-REEL
onsemi
-
MAX6643LBBAEE+
Analog Devices Inc./Maxim Integrated
-
MAX6684ESA+T
Analog Devices Inc./Maxim Integrated
-
MAX6639AEE+
Analog Devices Inc./Maxim Integrated
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