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Analog Devices Inc. ADT7470ARQZ-REEL7
- Part No.:
- ADT7470ARQZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADT7470ARQZ-REEL7.pdf
- Description:
- IC SENSOR TEMP FAN CTRLR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,941
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Product details
Overview
ADT7470ARQZ-REEL7 from Analog Devices is a multichannel temperature sensor hub and PWM fan controller IC designed for active thermal management in server and telecom systems. It monitors up to 10 remote TMP05 sensors via daisy-chained PWM input, controls four fans independently using open-drain PWM outputs (PWM1–PWM4), and reports faults via SMBALERT interrupt - all over a 400 kHz SMBus/I²C interface.
For engineers reviewing the ADT7470ARQZ-REEL7 datasheet, ADT7470ARQZ-REEL7 pinout, ADT7470ARQZ-REEL7 application, or ADT7470ARQZ-REEL7 equivalent, this device serves as a system-level thermal supervisor requiring precise fan speed regulation, out-of-limit fault signaling, and multi-sensor temperature decoding without host CPU intervention.
Technical Context
The ADT7470ARQZ-REEL7 implements a hardware-based monitoring cycle that autonomously samples tachometer inputs (TACH1–TACH4) in parallel and decodes TMP05 sensor outputs on TMP_IN with no software polling required. Its register-mapped SMBus interface supports full configuration of fan control modes (manual/auto), thermal zone limits, and interrupt masking.
It integrates dedicated circuitry for fan RPM-to-digital conversion (±12% accuracy, 65,535 full-scale count), SMBus timeout detection (25–31 ms), and three-state ADDR pin addressing (0x2C/0x2E/0x2F right-justified), enabling up to three devices on one bus without address conflict.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 5.5 V - supports direct connection to 3.3 V or 5 V system rails without level-shifting. |
| SMBus Speed | Up to 400 kHz - enables fast register access and real-time fan response in high-throughput thermal control loops. |
| Fan Channels | 4 independent PWM outputs (PWM1–PWM4) - each drives one fan with configurable frequency and polarity, including GPIO reassignment capability. |
| Temp Sensors | Up to 10 daisy-chained TMP05 - eliminates need for multiple I²C addresses or external multiplexing for dense thermal sensing. |
| Tach Input Accuracy | ±12% full-scale error - ensures reliable stall detection and RPM validation across 109–10,000 RPM range. |
| Interrupt Output | SMBALERT (open-drain, active-low) - signals fan under-speed, over-temperature, or sensor failure directly to service processor without polling. |
| Operating Temp | −40°C to +125°C - qualified for industrial and server chassis environments with localized hot spots. |
Pinout & Package
ADT7470ARQZ-REEL7 is housed in a 16-lead QSOP package (5.3 mm × 10.2 mm, 1.0 mm height) with standard 0.65 mm lead pitch and RoHS-compliant matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCL | SMBus clock input | Open-drain input requiring 2.2 kΩ pull-up; synchronizes all register reads/writes and tach sampling timing. |
| GND | Ground reference | Primary return path for analog and digital sections; must be low-impedance to minimize noise coupling into tach and TMP_IN inputs. |
| VCC | Power supply | 3.0–5.5 V input powering internal logic, PWM drivers, and temperature decoder; not floatable during SCL/SDA activity. |
| TACH1–TACH4 | Fan tachometer inputs | Open-drain inputs accepting 0–6.5 V pulses; each measures fan RPM independently with 16-bit counter resolution. |
| PWM1–PWM4 | Fan speed control outputs | Open-drain PWM outputs (10 kΩ pull-up typical); each configurable as GPIO via register bit 0x7F[x], supporting active-low or active-high logic. |
| ADDR | Address select | Three-state input setting SMBus slave address (0x2C/0x2E/0x2F); enables co-location of up to three ADT7470ARQZ-REEL7 on same bus. |
| TMP_IN | TMP05 sensor chain input | Open-drain PWM input decoding daisy-chained TMP05 outputs; no host software needed for temperature readback. |
| FULL_SPEED / TMP_START | Hardware override / sensor trigger | Active-low input forcing all fans to 100% duty cycle; dual-function pin also starts TMP05 measurement sequence when configured as output. |
| SMBALERT | Interrupt output | Open-drain active-low signal asserting on fan stall, over-temp, or limit violation; connects directly to service processor interrupt line. |
| SDA | SMBus data I/O | Open-drain bidirectional data line (2.2 kΩ pull-up); carries all register traffic, status reads, and configuration writes. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous tach monitoring | Hardware-initiated fan speed measurement cycle runs without CPU involvement, reducing host overhead in thermal management firmware. |
| Configurable PWM frequency | Per-fan PWM frequency selection (high/low mode) avoids audible noise in sensitive environments while maintaining control resolution. |
| Hardware TMP05 decoding | On-chip temperature decoder interprets daisy-chained TMP05 outputs directly on TMP_IN, eliminating need for external microcontroller parsing. |
| Full-speed hardware override | FULL_SPEED pin allows immediate fan blast to maximum speed under thermal emergency or system startup - bypassing software latency. |
| Register-lock capability | Configuration Register 1 (0x40) supports write-protection to prevent accidental modification of critical thermal thresholds and fan settings in production systems. |
Applications
| Server Thermal Management | Telecom Equipment Cooling |
|---|---|
Use Scenario: Real-time monitoring of CPU, GPU, and VRM temperatures across multi-socket server blades with dynamic fan speed adjustment per zone. IC Role / Device Role / Timing Role: Central thermal supervisor coordinating up to 10 TMP05 sensors and 4 PWM-controlled fans via SMBus, generating SMBALERT on thermal violation. Use Value: Enables deterministic fan response within 120 ms per TMP05 channel and eliminates software polling latency for critical thermal events. | Use Scenario: Maintaining safe operating temperature in high-density 1RU/2RU telecom switches with limited airflow and variable ambient conditions. IC Role / Device Role / Timing Role: Fan controller interfacing to service processor via SMBus, using FULL_SPEED pin for forced cooling during power-up or overload conditions. Use Value: Guarantees fan operation at 100% duty cycle within microseconds of FULL_SPEED assertion, preventing thermal runaway before firmware initialization. |
| Desktop PC Power Supply Monitoring | Industrial Embedded Controller Cooling |
Use Scenario: Monitoring PSU temperature and fan speed in ATX-compliant desktop motherboards with legacy SMBus infrastructure. IC Role / Device Role / Timing Role: Dual-role device acting as both temperature sensor hub (via TMP_IN) and fan speed regulator (via PWM1–PWM4), reporting status to BIOS/UEFI. Use Value: Reduces BOM count by consolidating discrete tach conditioners and SMBus fan controllers into single IC with integrated limit comparators. | Use Scenario: Thermal supervision of fan-cooled programmable logic controllers (PLCs) deployed in factory-floor enclosures with wide ambient temperature swings. IC Role / Device Role / Timing Role: Standalone thermal manager operating across −40°C to +125°C junction range, using ADDR pin to avoid address conflict with other SMBus peripherals. Use Value: Ensures continuous thermal protection even during extended firmware updates or watchdog resets, thanks to autonomous monitoring cycle. |
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 |
|---|---|---|---|
| ADT7476ARQZ-REEL7 | Includes integrated local temperature sensor (±1°C accuracy) and enhanced SMBus alert protocol; same pinout and register map. | Preferred where board space prohibits adding discrete local sensor; supports tighter thermal margining near IC die. | Select when local die temperature monitoring is required alongside remote TMP05 sensing. |
| NCT7802Y | Supports up to 6 fans and 8 remote diode sensors (not TMP05); uses SMBus 2.0 packet error checking; different pinout and register structure. | Better suited for systems using thermal diodes instead of TMP05 PWM sensors; requires PCB redesign and firmware adaptation. | Choose only if migrating from diode-based thermal sensing and higher fan count is needed. |
Compared with ADT7470ARQZ-REEL7, ADT7476ARQZ-REEL7 adds local sensing without layout change, while NCT7802Y offers more fan channels but mandates new hardware and driver integration - making ADT7470ARQZ-REEL7 optimal for TMP05-based, 4-fan server thermal subsystems.
Availability
ADT7470ARQZ-REEL7 is available at Aetrix Electronics and suitable for server thermal management, telecom equipment cooling, desktop PC power supply monitoring, and industrial embedded controller cooling requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for ADT7470ARQZ-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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and computing markets.
The ADT7470ARQZ-REEL7 belongs to Analog Devices' thermal management IC product line, engineered specifically for intelligent, autonomous fan control and multi-sensor temperature supervision in high-reliability compute and networking infrastructure.
FAQ
What is the function of the FULL_SPEED pin on the ADT7470ARQZ-REEL7?
The FULL_SPEED pin on the ADT7470ARQZ-REEL7 is an active-low hardware override that forces all four PWM fan outputs to 100% duty cycle immediately upon assertion, bypassing software control loops. This feature ensures rapid thermal mitigation during system startup or emergency over-temperature events. The pin must not be left floating; it should be tied to VCC when unused. ADT7470ARQZ-REEL7 uses this pin to guarantee deterministic fan response independent of host firmware state.
How many remote temperature sensors can the ADT7470ARQZ-REEL7 monitor, and what type are supported?
The ADT7470ARQZ-REEL7 monitors up to 10 remote temperature sensors - exclusively TMP05 (or TMP06) devices connected in daisy-chain configuration via the TMP_IN pin. It decodes their PWM outputs in hardware without host CPU involvement, delivering temperature values directly to SMBus-accessible registers. ADT7470ARQZ-REEL7 does not support diode-based or I²C-output sensors; its temperature interface is purpose-built for TMP05 compatibility.
Does the ADT7470ARQZ-REEL7 require external components for basic operation?
Yes - ADT7470ARQZ-REEL7 requires external 2.2 kΩ pull-up resistors on SCL and SDA lines for SMBus compliance, and 10 kΩ pull-ups on PWM1–PWM4 outputs for proper open-drain fan drive. The ADDR pin needs a 10 kΩ pull-up or pull-down to set SMBus address; FULL_SPEED must be pulled to VCC when inactive. No external crystal or oscillator is needed, as timing is derived from the SMBus clock. ADT7470ARQZ-REEL7 operates with these minimal passives and no additional ICs for core functionality.
Can the PWM outputs of the ADT7470ARQZ-REEL7 be used as general-purpose I/O pins?
Yes - each PWM output (PWM1–PWM4) on the ADT7470ARQZ-REEL7 can be individually reconfigured as a general-purpose open-drain I/O pin by setting corresponding bits in Configuration Register 0x7F. Direction, polarity, and status are controlled via dedicated GPIO registers (0x80–0x81). This flexibility allows reuse of fan control pins for system signaling or status indication when fan control is not required. ADT7470ARQZ-REEL7 retains full register-level control over each pin's behavior regardless of mode.
What SMBus address options does the ADT7470ARQZ-REEL7 support, and how are they selected?
The ADT7470ARQZ-REEL7 supports three SMBus slave addresses via the three-state ADDR pin: 0x2C (ADDR tied low), 0x2E (ADDR floating), or 0x2F (ADDR pulled high with 10 kΩ to VCC), all right-justified. The address is latched on the first valid SMBus transaction after power-up and remains fixed until reset. This enables up to three ADT7470ARQZ-REEL7 devices on a single bus without address collision. ADT7470ARQZ-REEL7 uses this scheme to simplify multi-zone thermal management in large systems without requiring address-programmable EEPROM.
ADT7470ARQZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Fan Control, Temp Monitor
- Sensor Type:
- External
- Sensing Temperature:
- External Sensor
- Accuracy:
- -
- Topology:
- ADC, Comparator, Fan Speed Control, Register Bank
- Output Type:
- I2C/SMBus
- Output Alarm:
- Yes
- Output Fan:
- Yes
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
ADT7470ARQZ-REEL7 FAQ
1.How can I place an order for ADT7470ARQZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADT7470ARQZ-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 ADT7470ARQZ-REEL7 reliable?
The price and inventory of ADT7470ARQZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT7470ARQZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADT7470ARQZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADT7470ARQZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADT7470ARQZ-REEL7?
ADT7470ARQZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADT7470ARQZ-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 ADT7470ARQZ-REEL7?
For technical support, including ADT7470ARQZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT7470ARQZ-REEL7 requirements.
6.How does Aetrix verify that ADT7470ARQZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADT7470ARQZ-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 ADT7470ARQZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADT7470ARQZ-REEL7?
All ADT7470ARQZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADT7470ARQZ-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 ADT7470ARQZ-REEL7 part is unused and in its original packaging.
Return procedure for ADT7470ARQZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADT7470ARQZ-REEL7 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
-
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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