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Analog Devices Inc. ADM1025ARQ-REEL7
- Part No.:
- ADM1025ARQ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADM1025ARQ-REEL7.pdf
- Description:
- PC HARDWARE MONITOR IC
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
ADM1025ARQ-REEL7 from Analog Devices is a low-cost PC hardware monitor ASIC that integrates voltage monitoring (2.5 V, 3.3 V, 5 V, 12 V, VCCPIN), on-chip temperature sensing (±3°C accuracy), and remote diode temperature measurement (±5°C) for microprocessor-based systems. It features I²C/SMBus interface, programmable INT/RST output, and VID0–VID4 digital inputs for CPU core voltage ID decoding. Used in network servers and desktop PCs for real-time power and thermal supervision.
For engineers reviewing the ADM1025ARQ-REEL7 datasheet, ADM1025ARQ-REEL7 pinout, ADM1025ARQ-REEL7 application, or ADM1025ARQ-REEL7 equivalent, key selection criteria include its 16-pin QSOP package, integrated 100 kΩ VID pull-ups (ADM1025 variant), 8-channel measurement capability, SMBus address configurability via ADD pin, and support for both local/remote temperature monitoring with offset calibration.
Technical Context
The ADM1025ARQ-REEL7 implements an 8-bit successive-approximation ADC with built-in attenuators for direct monitoring of 2.5 V to 12 V supplies without external components; conversion time is 11.6 ms per analog input and 34.8 ms for remote diode sensing due to 16-cycle averaging. Its internal bandgap temperature sensor provides ±3°C accuracy over 0°C to 100°C, while remote sensing uses dual-current ∆VBE technique with chopper-stabilized amplification and 65 kHz low-pass filtering.
It supports SMBus 1.1 protocol with hardwired 7-bit address (01011xx), where the two LSBs are set by ADD/RST/INT/NTO pin state at power-up; this pin is also configurable as reset output (20–45 ms pulse) or interrupt output. VID0–VID3 inputs include on-chip 100 kΩ pull-ups (confirmed for ADM1025 family), and 12VIN/VID4 is a dual-mode pin with 300 kΩ pull-up in VID4 mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0 V to 5.5 V - enables operation from 3.3 V standby rail or main 5 V supply without level-shifting. |
| Supply Current (Active) | 1.4–2.5 mA - low active power draw suitable for always-on system monitoring during sleep states. |
| Internal Temp Accuracy | ±3°C - sufficient for ambient thermal management in PCs and office equipment without calibration. |
| Remote Diode Accuracy | ±5°C (±3°C at 60–100°C) - meets requirements for CPU die temperature tracking with discrete transistor sensors. |
| ADC Resolution | 8-bit - delivers 1°C temperature resolution and ~1% voltage resolution across full-scale ranges. |
| SMBus Clock Frequency | Up to 400 kHz - compatible with standard high-speed I²C controllers and embedded BMCs. |
| Operating Temperature | 0°C to +100°C - validated for server motherboard and industrial PC environments. |
Pinout & Package
ADM1025ARQ-REEL7 is housed in a 16-lead QSOP (RQ-16) package, 3.9 mm × 4.9 mm body, 1.0 mm max height, 0.635 mm lead pitch. Pin 1 is SDA (open-drain bidirectional data); Pin 16 is ADD/RST/INT/NTO (configurable address bit/reset/interrupt output).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SDA) | Serial bus bidirectional data line | Open-drain I²C/SMBus data channel requiring external pull-up; shares bus with other slave devices. |
| 2 (SCL) | Serial bus clock input | Master-generated clock synchronizing all SMBus transactions; supports up to 400 kHz. |
| 4 (VCC) | Power supply and VCC monitoring input | Supplies chip and simultaneously measures own supply voltage - no separate VCC sense trace needed. |
| 5–8 (VID0–VID3) | Digital voltage ID inputs | Read processor core voltage code; internal 100 kΩ pull-ups eliminate need for external resistors (ADM1025-specific). |
| 9 (D–/NTI) | Remote diode cathode / NAND test input | Biased above ground to reject noise; high at power-up enables diagnostic NAND tree test mode. |
| 10 (D+) | Remote diode anode input | Paired with D– for ∆VBE measurement; supports NPN/PNP transistors or integrated diode sensors. |
| 11 (12VIN/VID4) | Programmable analog/digital input | Defaults to 12 V analog input; reconfigurable as VID4 with 300 kΩ pull-up - enables 5-bit CPU VID decoding. |
| 16 (ADD/RST/INT/NTO) | Configurable address/interrupt/reset pin | Samples ADD state at power-up for SMBus addressing; later repurposed as active-low RST or INT signal. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated VID pull-ups | On-chip 100 kΩ resistors on VID0–VID3 reduce BOM count and PCB space vs. discrete pull-ups. |
| Multi-supply voltage monitoring | Five dedicated analog inputs (2.5 V, 3.3 V, 5 V, 12 V, VCCPIN) with internal attenuators - no external dividers required. |
| Remote diode sensing | Chopper-stabilized ∆VBE measurement with 16-sample digital averaging - rejects noise in electrically noisy CPU VRM environments. |
| Programmable interrupt output | Single pin (ADD/RST/INT/NTO) can assert under/over-voltage or over-temperature events - simplifies system fault signaling. |
| Offset calibration register | Two's complement offset value applied to internal or external temperature channel - compensates for sensor placement thermal lag or PCB self-heating. |
Applications
| Server Power Monitoring | Desktop PC Thermal Management |
|---|---|
Use Scenario: Real-time supervision of 12 V VRM, 3.3 V standby rail, and CPU core voltage in dual-socket x86 servers. IC Role / Device Role / Timing Role: Hardware monitor ASIC performing periodic voltage sampling and temperature polling via SMBus every ~114 ms cycle. Use Value: Enables BIOS/firmware to throttle CPU or trigger shutdown before overvoltage damages memory or overtemperature degrades DRAM reliability. |
Use Scenario: Ambient and CPU die temperature tracking in consumer desktop motherboards using integrated Pentium II/III diode sensors. IC Role / Device Role / Timing Role: Local temperature sensor + remote diode interface feeding thermal data to host controller every 34.8 ms (external) or 11.6 ms (internal). Use Value: Supports fan speed control algorithms with ±3°C ambient and ±5°C die accuracy - maintains acoustic performance while preventing thermal throttling. |
| Office Equipment Power Integrity | Test Instrument Supply Verification |
Use Scenario: Monitoring 5 V logic rail and 2.5 V I/O supply in multifunction printers and networked copiers. IC Role / Device Role / Timing Role: Standby-mode-capable monitor (500 µA) providing continuous voltage health checks during low-power sleep states. Use Value: Detects brown-out conditions before wake-up, preventing corrupted firmware boot sequences and ensuring reliable resume-from-sleep operation. |
Use Scenario: Verifying stable 3.3 V and 12 V outputs of bench power supplies and automated test equipment front-ends. IC Role / Device Role / Timing Role: Precision analog monitor with 8-bit ADC and programmable limits - flags out-of-spec conditions via INT pin for logging or relay control. Use Value: Eliminates need for external DMM integration; provides deterministic pass/fail response within 114 ms monitoring cycle for production test throughput. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hardware monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM1025AARQ-REEL7 | Open-drain VID0–VID3 inputs (no internal pull-ups); requires external 100 kΩ pull-ups. | Used where board-level flexibility in VID termination is preferred or when sharing VID lines with multiple devices. | Select ADM1025AARQ-REEL7 only if external pull-up control is required; ADM1025ARQ-REEL7 reduces component count. |
| LM92CIMX-5/NOPB | Dedicated ±0.33°C remote diode sensor with 12-bit resolution; no voltage monitoring or VID inputs. | Applicable only for high-accuracy temperature-only monitoring; lacks multi-rail voltage supervision. | Choose LM92CIMX-5/NOPB when precision thermal feedback is critical and voltage monitoring is handled separately. |
Compared with ADM1025AARQ-REEL7, ADM1025ARQ-REEL7 saves two external resistors and simplifies layout; compared with LM92CIMX-5/NOPB, it trades temperature resolution for integrated voltage/VID functionality - making it a complete single-chip solution for PC-class system monitoring.
Availability
ADM1025ARQ-REEL7 is available at Aetrix Electronics and suitable for network servers, desktop PCs, and office equipment requiring stable component supply with long-term lifecycle support.
Supply support for ADM1025ARQ-REEL7 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 leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The ADM1025 product line delivers cost-optimized, integrated hardware monitoring solutions targeting PC, server, and embedded computing platforms where compact size, SMBus compatibility, and multi-rail supervision are essential.
FAQ
What is the function of the ADD/RST/INT/NTO pin on the ADM1025ARQ-REEL7?
The ADD/RST/INT/NTO pin (Pin 16) serves three roles: during power-up, it sets the two LSBs of the SMBus address; in normal operation, it can be configured as a reset output delivering a 20–45 ms active-low pulse, or as an interrupt output signaling voltage/temperature limit violations. The ADM1025ARQ-REEL7 does not allow simultaneous use of all three functions - configuration is done via internal registers after initialization.
Does the ADM1025ARQ-REEL7 require external components for voltage monitoring?
No, the ADM1025ARQ-REEL7 includes on-chip attenuators for all five voltage inputs (2.5 V, 3.3 V, 5 V, 12 V, VCCPIN), eliminating the need for external resistor dividers. Input protection diodes and RC filters are also integrated. Only the remote diode interface requires a discrete NPN/PNP transistor or diode-connected IC; no additional biasing components are needed for basic operation of the ADM1025ARQ-REEL7.
How does the ADM1025ARQ-REEL7 handle remote temperature sensing accuracy?
The ADM1025ARQ-REEL7 achieves ±5°C remote diode accuracy (±3°C between 60°C and 100°C) using a dual-current ∆VBE method with chopper stabilization, 65 kHz low-pass filtering, and 16-sample digital averaging. This design cancels device-to-device VBE variation and rejects noise - enabling reliable CPU die temperature tracking without factory calibration. The ADM1025ARQ-REEL7 stores results in twos-complement 8-bit format for direct interpretation.
Can the ADM1025ARQ-REEL7 monitor its own supply voltage?
Yes, the ADM1025ARQ-REEL7 monitors its own VCC supply through Pin 4 (VCC), which serves as both power input and analog measurement channel. This allows detection of brown-out or overvoltage conditions on the monitor's own rail - critical for fail-safe behavior in systems where the hardware monitor must remain functional even during upstream power faults. The ADM1025ARQ-REEL7 reports this value in the same register structure as other voltage channels.
What is the difference between ADM1025ARQ-REEL7 and ADM1025AARQ-REEL7?
The ADM1025ARQ-REEL7 includes integrated 100 kΩ pull-up resistors on VID0–VID3 pins, while the ADM1025AARQ-REEL7 has open-drain VID inputs requiring external pull-ups. Both share identical pinout, SMBus interface, voltage/temperature specs, and 16-lead QSOP packaging. The ADM1025ARQ-REEL7 reduces BOM count and simplifies layout for standard PC implementations where fixed VID termination is acceptable.
ADM1025ARQ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Applications:
- PC's, PDA's
- Interface:
- I2C
- Voltage - Supply:
- 3V ~ 5.5V
- Supplier Device Package:
- 16-QSOP
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
ADM1025ARQ-REEL7 FAQ
1.How can I place an order for ADM1025ARQ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1025ARQ-REEL7 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 ADM1025ARQ-REEL7 reliable?
The price and inventory of ADM1025ARQ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1025ARQ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM1025ARQ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1025ARQ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1025ARQ-REEL7?
ADM1025ARQ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1025ARQ-REEL7 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 ADM1025ARQ-REEL7?
For technical support, including ADM1025ARQ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1025ARQ-REEL7 requirements.
6.How does Aetrix verify that ADM1025ARQ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM1025ARQ-REEL7 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 ADM1025ARQ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM1025ARQ-REEL7?
All ADM1025ARQ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM1025ARQ-REEL7, 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 ADM1025ARQ-REEL7 part is unused and in its original packaging.
Return procedure for ADM1025ARQ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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