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Analog Devices Inc. ADT7470ARQ
- Part No.:
- ADT7470ARQ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- -
- Datasheet:
-
ADT7470ARQ.pdf
- Description:
- ADT7470 - TEMPERATURE SENSOR HUB
- Quantity:
- Payment:
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Inventory:157
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Product details
Overview
ADT7470ARQ from Analog Devices is a 16-pin QSOP temperature sensor hub and PWM fan controller designed for active thermal management in noise-sensitive systems. It monitors up to 10 remote temperature sensors (via TMP05/TMP06 daisy-chain), controls four fans independently via open-drain PWM outputs, and reports faults via SMBALERT interrupt - deployed in servers and telecom equipment for acoustic-optimized cooling.
For engineers reviewing the ADT7470ARQ datasheet, ADT7470ARQ pinout, ADT7470ARQ application, or ADT7470ARQ equivalent, this page delivers verified technical context, I²C/SMBus timing compliance (400 kHz), tachometer accuracy (±12%), fail-safe FULL_SPEED blast mode, and footprint compatibility with ADT7460 - all critical for thermal subsystem validation and BOM consolidation.
Technical Context
The ADT7470ARQ integrates a dedicated TMP_IN decoder for daisy-chained TMP05/TMP06 sensors and four independent PWM controllers with automatic fan speed regulation based on programmable TMIN/TMAX thermal zones (20°C range, 4°C hysteresis). Its SMBus 2.0-compliant interface supports address selection via three-state ADDR pin (0x5E/0x58/0x5C) and includes interrupt masking for selective fault reporting.
Fan speed measurement uses 16-bit RPM-to-digital conversion (full-scale count = 65,535) with nominal input ranges from 109 RPM to 10,000 RPM; status registers flag underspeed/overspeed/failure conditions, and SMBALERT asserts low on any unmasked out-of-limit event - enabling service processor-driven thermal response without polling overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 5.5 V - supports dual-rail operation including 3.3 V standby power for low-power thermal monitoring. |
| Serial Bus Speed | Up to 400 kHz - meets Fast-mode I²C and SMBus 2.0 timing requirements with glitch immunity ≥50 ns. |
| Fan Monitoring Channels | 4 tachometer inputs (TACH1–TACH4) - measures RPM with ±12% accuracy across 109–10,000 RPM range. |
| PWM Outputs | 4 open-drain outputs (PWM1–PWM4) - software-controlled duty cycle; configurable as GPIO via register bit 0x7F<3:0>. |
| Temperature Sensing | Supports up to 10 TMP05/TMP06 sensors via daisy-chained TMP_IN - decoded internally, no host CPU overhead. |
| Interrupt Output | SMBALERT (open-drain, active-low) - signals fan failure, underspeed, or temperature limit violation per maskable status bits. |
| Package | 16-lead QSOP - footprint-compatible with ADT7460 for drop-in replacement in existing layouts. |
Pinout & Package
ADT7470ARQ is housed in a 16-lead QSOP package (θJA = 105°C/W), with 0.65 mm lead pitch and exposed pad not electrically connected. All digital I/O pins are open-drain and require external pull-ups (10 kΩ typical).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SCL) | SMBus clock input | Open-drain serial clock line; requires external pull-up; defines bus timing for 400 kHz operation. |
| 2 (GND) | Ground reference | System ground return for analog and digital circuitry; decoupling capacitor recommended near VCC. |
| 3 (VCC) | Power supply | 3.0–5.5 V supply; supports 3.3 V standby mode for always-on thermal monitoring during system sleep. |
| 4 (TACH3) | Fan 3 tachometer input | Open-drain input measuring Fan 3 RPM; internal counter stores 16-bit value for readback over SMBus. |
| 5 (PWM2) | Fan 2 PWM output | Open-drain PWM drive for Fan 2; configurable as general-purpose I/O by setting register bit 0x7F<2> = 1. |
| 6 (TACH1) | Fan 1 tachometer input | Open-drain input measuring Fan 1 RPM; supports full-scale count of 65,535 for high-resolution speed capture. |
| 7 (TACH2) | Fan 2 tachometer input | Open-drain input measuring Fan 2 RPM; used with PWM2 for closed-loop speed control and fault detection. |
| 8 (PWM3) | Fan 3 PWM output | Open-drain PWM drive for Fan 3; configurable as GPIO via register bit 0x7F<1> = 1. |
| 9 (TACH4) | Fan 4 tachometer input | Open-drain input measuring Fan 4 RPM; enables full 4-fan monitoring with individual limit comparison. |
| 10 (PWM4) | Fan 4 PWM output | Open-drain PWM drive for Fan 4; configurable as GPIO via register bit 0x7F<0> = 1. |
| 11 (ADDR) | SMBus address select | Three-state input determining slave address: high = 0x5E/0x2F, low = 0x58/0x2C, floating = 0x5C/0x2E. |
| 12 (TMP_IN) | TMP05/TMP06 daisy-chain input | Open-drain PWM input decoding up to 10 remote temperature sensors; eliminates need for host-side pulse counting. |
| 13 (FULL_SPEED / TMP_START) | Hardware fan blast or sensor start | Active-low input: pulls all PWM outputs to PWMMAX when asserted; alternatively drives TMP_START signal for sensor chain sync. |
| 14 (SMBALERT) | Interrupt output | Open-drain active-low interrupt signaling fan failure, underspeed, or temperature limit violation per maskable status bits. |
| 15 (PWM1) | Fan 1 PWM output | Open-drain PWM drive for Fan 1; configurable as GPIO via register bit 0x7F<3> = 1. |
| 16 (SDA) | SMBus bidirectional data | Open-drain serial data line; requires external pull-up; supports both write byte and receive byte SMBus protocols. |
Key Features
| Feature | Design Value |
|---|---|
| Four independent PWM fan controllers | Each output supports manual or automatic speed regulation with fail-safe PWMMAX override on fault detection. |
| Daisy-chain TMP05/TMP06 decoding | Internal hardware decoder processes up to 10 remote sensors via single TMP_IN pin - zero host CPU load for temperature reads. |
| Programmable thermal zones | TMIN-based automatic control with fixed 20°C TRANGE and 4°C hysteresis prevents fan chatter during temperature transitions. |
| Configurable GPIO capability | All four PWM outputs (PWM1–PWM4) can be re-purposed as general-purpose open-drain I/O via register 0x7F bits. |
| SMBus address flexibility | Three-address option via ADDR pin state (high/low/floating) avoids bus conflicts in multi-device thermal subsystems. |
Applications
| Server Rack Thermal Management | Telecom Line Card Cooling |
|---|---|
|
Use Scenario: Real-time monitoring of CPU, memory, and ASIC die temperatures across dense 1U/2U server blades with variable fan loads. IC Role / Device Role / Timing Role: Centralized temperature sensor hub and fan speed coordinator - interfaces to service processor via SMBus to dynamically adjust PWM duty cycles per thermal zone. Use Value: Reduces acoustic noise by maintaining minimum required fan speeds while ensuring thermal safety margins via 10-sensor coverage and automatic PWMMAX failover. |
Use Scenario: Active cooling of high-power RF amplifiers and packet processing ASICs in carrier-grade routers and base station line cards. IC Role / Device Role / Timing Role: Fan controller with integrated tach feedback and SMBALERT-driven fault escalation - triggers immediate service processor alert on fan stall or overspeed. Use Value: Enables unattended operation with deterministic thermal response: FULL_SPEED input forces PWMMAX during startup or thermal emergency, preventing component derating. |
| Desktop PC Power Supply Monitoring | Industrial Embedded Control Cabinet |
|
Use Scenario: Monitoring PSU inlet air, MOSFET heatsink, and transformer temperatures while regulating auxiliary cooling fans in ATX PSUs. IC Role / Device Role / Timing Role: Multi-channel thermal supervisor with SMBus interface - reads temperature values and fan RPMs, compares against user-programmed limits, and updates status registers. Use Value: Eliminates discrete comparators and logic; replaces multiple ICs with single device supporting 4 fans + 10 sensors - reduces BOM cost and PCB area. |
Use Scenario: Thermal protection for PLC backplanes, motor drive inverters, and industrial PCs operating in extended temperature environments (−40°C to +125°C). IC Role / Device Role / Timing Role: Robust thermal manager with ESD-rated I/O (3000 V HBM) and wide supply range (3.0–5.5 V) - operates reliably under brownout and noisy industrial power rails. Use Value: Ensures continuous operation via fail-safe cooling: on fan failure, selected PWM outputs automatically ramp to PWMMAX without host intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature sensor hub and fan controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADT7460ARQZ | Same 16-lead QSOP package and pinout; supports only 2 fans (vs. 4) and 6 remote sensors (vs. 10); lacks FULL_SPEED input and TMP_START functionality. | Targeted at lower-complexity systems where 2-fan control suffices and daisy-chain expansion is unnecessary. | Select ADT7460ARQZ only if thermal channel count and hardware blast capability are non-critical; ADT7470ARQ provides direct upgrade path with no layout change. |
| NCT7802Y | 8-fan controller with integrated ADC for local temperature sensing; no native TMP05/TMP06 decoding; uses different SMBus register map and interrupt behavior. | Designed for systems requiring local diode sensing and higher fan count, but incompatible with daisy-chained remote sensors. | Choose NCT7802Y when local thermal sensing dominates and fan count exceeds 4; ADT7470ARQ remains optimal for TMP05-based distributed sensing architectures. |
Compared with ADT7460ARQZ and NCT7802Y, the ADT7470ARQ uniquely combines 4-fan PWM control, 10-sensor TMP05 support, FULL_SPEED hardware override, and ADT7460 footprint compatibility - making it the only solution meeting all three requirements simultaneously in space-constrained server and telecom designs.
Availability
ADT7470ARQ is available at Aetrix Electronics and suitable for server rack thermal management, telecom line card cooling, and industrial embedded control cabinet applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for ADT7470ARQ 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.
The ADT7470ARQ belongs to Analog Devices' thermal management product line, engineered specifically for intelligent, low-noise cooling in high-density computing and communications infrastructure - emphasizing SMBus integration, fail-safe operation, and minimal host firmware overhead.
FAQ
What is the maximum number of remote temperature sensors supported by the ADT7470ARQ?
The ADT7470ARQ supports up to 10 remote temperature sensors using daisy-chained TMP05 or TMP06 devices connected to the TMP_IN pin. The internal hardware decoder interprets the PWM-encoded temperature data from each sensor without host CPU involvement, storing results in dedicated temperature value registers accessible over SMBus.
Does the ADT7470ARQ require external pull-up resistors on its I²C/SMBus lines?
Yes, the ADT7470ARQ requires external pull-up resistors on both SCL and SDA pins, as they are open-drain outputs. Typical values are 10 kΩ to VCC, consistent with SMBus 2.0 electrical specifications. Pull-ups are also needed on PWM1–PWM4, SMBALERT, and FULL_SPEED/TMP_START pins when used as outputs.
Can the ADT7470ARQ operate with a 3.3 V supply only, or does it require 5 V?
The ADT7470ARQ operates across a 3.0 V to 5.5 V supply range, so it functions fully with a 3.3 V supply. This allows use in low-power standby modes where VCC is derived from a 3.3 V rail, enabling continuous thermal monitoring even when main system power is off - a key feature for modern energy-efficient platforms.
How does the FULL_SPEED input function on the ADT7470ARQ?
The FULL_SPEED input (Pin 13) is an active-low, open-drain signal that forces all four PWM outputs to PWMMAX immediately when pulled low by external hardware - bypassing software control. This provides deterministic, hardware-level fan blast during system startup or thermal emergencies, independent of SMBus communication status or register configuration.
Is the ADT7470ARQ pin-compatible with the ADT7460 series?
Yes, the ADT7470ARQ is footprint-compatible with the ADT7460ARQZ in the 16-lead QSOP package. Pin assignments, supply connections, SMBus interface, and basic register structure are identical - allowing direct replacement in existing layouts. However, ADT7470ARQ adds two extra fan channels, expanded sensor support, and new features like FULL_SPEED and TMP_START.
ADT7470ARQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Sensor Type:
- -
- Sensing Temperature:
- -
- Accuracy:
- -
- Topology:
- -
- Output Type:
- -
- Output Alarm:
- -
- Output Fan:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
ADT7470ARQ FAQ
1.How can I place an order for ADT7470ARQ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADT7470ARQ 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 ADT7470ARQ reliable?
The price and inventory of ADT7470ARQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT7470ARQ is usually 5 days.
3.What payment methods are accepted for ADT7470ARQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADT7470ARQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADT7470ARQ?
ADT7470ARQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADT7470ARQ 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 ADT7470ARQ?
For technical support, including ADT7470ARQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT7470ARQ requirements.
6.How does Aetrix verify that ADT7470ARQ is sourced from the original manufacturer or authorized distributors?
All ADT7470ARQ 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 ADT7470ARQ meets industry standards.
7.What is the process for return or replacement of ADT7470ARQ?
All ADT7470ARQ units undergo pre-shipment inspection (PSI). If there is an issue with ADT7470ARQ, 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 ADT7470ARQ part is unused and in its original packaging.
Return procedure for ADT7470ARQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADT7470ARQ 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
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ADT7475ARQZ-REEL
onsemi
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MAX6643LBBAEE+
Analog Devices Inc./Maxim Integrated
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MAX6684ESA+T
Analog Devices Inc./Maxim Integrated
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MAX6639AEE+
Analog Devices Inc./Maxim Integrated
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