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Product Detailed Parameters
- Description：IC H/W MONITOR
- Series：-
- Mfr：Nuvoton Technology Corporation
- Package：Tray
- Function：Hardware Monitor
- Sensor Type：Internal and External
- Sensing Temperature：-20°C ~ 100°C
- Accuracy：±1°C
- Topology：ADC, Comparator, Register Bank
- Output Type：I2C/SMBus
- Output Alarm：Yes
- Output Fan：Yes
- Voltage - Supply：3.3V
- Operating Temperature：-20°C ~ 100°C
- Grade：-
- Qualification：-
- Mounting Type：Surface Mount
- Package / Case：48-LQFP
- Supplier Device Package：48-LQFP (7x7)
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Overview
The NCT7904D is a hardware monitor IC designed for high-end computer systems like servers and workstations. It features an internal 10-bit ADC to simultaneously monitor up to 20 analog voltage inputs, including power pins (3VDD, 3VSB, VBAT, VTT), 12 fan tachometer inputs, and 4 remote temperature sensor inputs. The device supports Intel PECI 1.0/2.0/3.0 and AMD SB-TSI interfaces for automatic CPU and DRAM thermal data retrieval. It provides four PWM outputs with SMART FAN IV control and closed-loop RPM modes. Operating at 3.3V, it utilizes I2C/SMBus 2.0 communication and is packaged in a 48-LQFP (7mm x 7mm) format.
Feature Summary
- Supports Intel PECI 1.0/2.0/3.0 and AMD SB-TSI interfaces for direct CPU and DRAM thermal monitoring.
- Integrates SMART FAN IV technology allowing customizable temperature-to-fan speed mapping tables.
- Includes self-initialization capabilities via external EEPROM configuration through the SMBus interface.
- Provides comprehensive alarm mechanisms including SMI#, temperature, voltage, and fan fault signals.
Applications
- Server system hardware monitoring
- Workstation thermal management
- High-end computer stability control
Procurement Notes
Verify the specific revision number on the datasheet to ensure compatibility with your system requirements. Confirm that the 48-LQFP package dimensions match your PCB layout constraints. Ensure the design supports the required 3.3V supply voltage and SMBus addressing scheme for proper integration.
Selection Notes
Select this component when advanced thermal reporting via PECI or TSI is required alongside local sensor monitoring. It is suitable for designs needing multiple fan control outputs with intelligent speed adjustment algorithms. Consider its GPIO availability if additional system status indicators are needed.
Part Context
This part belongs to the Nuvoton Hardware Monitor IC family, evolving from previous popular models. It is specifically engineered to address the complex monitoring needs of modern computing platforms by combining traditional sensor reading with processor-specific interface protocols.
Replacement Considerations
Check for pin-compatible alternatives within the same manufacturer's portfolio that support similar PECI versions. Verify that any substitute maintains the 48-LQFP package and 3.3V operation to ensure mechanical and electrical compatibility without redesigning the host board.
FAQ
How does the NCT7904D handle CPU temperature data?
It automatically retrieves CPU temperature and power status using the Intel PECI interface or AMD SB-TSI interface, eliminating the need for external sensors for these specific metrics.
What fan control modes are supported?
The device supports SMART FAN IV mode, which uses configurable temperature-to-speed tables, and Closed Loop Fan Control Mode (RPM mode) for precise speed regulation.
