Overview
The ADT7470, produced by Analog Devices Inc., is a multifunctional electronic component designed to serve as a temperature sensor hub and a pulse-width modulation (PWM) fan controller. This device is tailored for systems that require active cooling and precise temperature monitoring. It communicates with the system via a serial system management bus, supporting both SMBus and fast I2C specifications. The ADT7470 can monitor up to 10 daisy-chained TMP05 temperature sensors and control fan speeds, making it an essential component for maintaining optimal system temperatures.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | 3.0 | 3.3 | 5.5 | V | |
| Supply Current, ICC | 0.5 | 0.8 | mA | ||
| Standby Current, ICC | 4 | µA | |||
| Fan RPM-to-Digital Converter Accuracy | ±12 % | ||||
| Full-Scale Count | 65,535 | ||||
| Clock Frequency, fSCLK | 400 kHz | See Figure 2 | |||
| Bus Free Time, tBUF | 1.3 µs | See Figure 2 | |||
| Start Setup Time, tSU;STA | 600 ns | See Figure 2 | |||
| Start Hold Time, tHD;STA | 600 ns | See Figure 2 | |||
| SCL Low Time, tLOW | 1.3 µs | See Figure 2 | |||
| SCL High Time, tHIGH | 0.6 µs | See Figure 2 | |||
| SCL, SDA Rise Time, tr | 300 ns | See Figure 2 | |||
| SCL, SDA Fall Time, tf | 300 ns | See Figure 2 |
Key Features
- Temperature Monitoring: Capable of monitoring up to 10 daisy-chained TMP05 temperature sensors.
- PWM Fan Control: Controls fan speeds using pulse-width modulation.
- Serial Bus Interface: Communicates via SMBus and fast I2C, with a 7-bit serial bus address.
- General-Purpose I/O Pins: Four pins can be configured as either general-purpose logic pins or as PWM outputs.
- Fan Speed Monitoring: Converts fan RPM to digital data with an accuracy of ±12%.
- Low Power Consumption: Standby current as low as 4 µA.
- Flexible Addressing: Address selection via Pin 11, allowing for different addressing options.
Applications
- Server and Data Center Cooling: Ideal for monitoring and controlling fan speeds in server racks and data centers.
- Industrial Automation: Used in industrial systems that require precise temperature monitoring and cooling.
- Embedded Systems: Suitable for embedded systems that need to manage temperature and fan control efficiently.
- Telecommunications Equipment: Applied in telecommunications equipment to ensure optimal operating temperatures.
Q & A
- What is the primary function of the ADT7470?
The ADT7470 is a multichannel temperature sensor hub and PWM fan controller, designed for systems requiring active cooling and precise temperature monitoring.
- How many temperature sensors can the ADT7470 monitor?
The ADT7470 can monitor up to 10 daisy-chained TMP05 temperature sensors.
- What communication protocols does the ADT7470 support?
The ADT7470 supports both SMBus and fast I2C communication protocols.
- What is the supply voltage range for the ADT7470?
The supply voltage range for the ADT7470 is from 3.0 V to 5.5 V.
- How many general-purpose I/O pins does the ADT7470 have?
The ADT7470 has four general-purpose I/O pins that can be configured as either logic pins or PWM outputs.
- What is the accuracy of the fan RPM-to-digital converter?
The fan RPM-to-digital converter has an accuracy of ±12%.
- How does the ADT7470 address selection work?
The address selection is done via Pin 11, which can be set high, low, or left floating to achieve different addressing options.
- What is the standby current of the ADT7470?
The standby current of the ADT7470 is 4 µA.
- What are some common applications of the ADT7470?
The ADT7470 is commonly used in server and data center cooling, industrial automation, embedded systems, and telecommunications equipment.
- What is the maximum junction temperature for the ADT7470?
The maximum junction temperature for the ADT7470 is 150°C.
