Overview
The ADT7470ARQ-REEL7 from Analog Devices Inc. is a versatile and highly efficient temperature sensor and fan controller. This device is designed to interface directly with an I2C bus and is suitable for systems requiring active cooling. It can monitor up to 10 daisy-chained TMP05 temperature sensors and control the speed of fans using pulse-width modulation (PWM) outputs.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Supply Voltage | 3.0 | 3.3 | 5.5 | V | TA = −40°C to +125°C, VCC = 3.0 V to 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 | |||
| Glitch Immunity, tSW | 50 ns | See Figure 2 | |||
| Bus Free Time, tBUF | 1.3 µs | See Figure 2 |
Key Features
- Monitors up to 10 daisy-chained TMP05 temperature sensors.
- PWM outputs to control fan speed under software control.
- FULL_SPEED input allows fans to be driven to maximum speed by external hardware.
- SMBALERT interrupt signals failures to the system controller.
- Three-state ADDR pin allows up to 3 devices on a single bus.
- Temperature decoder interprets TMP05 temperature sensors and communicates values over I2C bus.
- Supports fast I2C standard (400 kHz max) and meets SMBus 2.0 electrical specifications (fully SMBus 1.1-compliant).
- General-purpose I/O pins (open drain) that can be configured as either logic pins or PWM outputs.
Applications
- Servers
- Networking and telecommunications equipment
- Desktops
- Any system requiring active cooling and temperature monitoring.
Q & A
- What is the primary function of the ADT7470ARQ-REEL7?
The ADT7470ARQ-REEL7 is a multichannel temperature sensor and PWM fan controller designed for systems requiring active cooling.
- How many TMP05 temperature sensors can the ADT7470ARQ-REEL7 monitor?
The ADT7470ARQ-REEL7 can monitor up to 10 daisy-chained TMP05 temperature sensors.
- What is the maximum clock frequency supported by the ADT7470ARQ-REEL7?
The device supports a maximum clock frequency of 400 kHz.
- What is the purpose of the SMBALERT interrupt?
The SMBALERT interrupt signals failures to the system controller.
- How many devices can be connected on a single bus using the ADDR pin?
Up to 3 devices can be connected on a single bus using the three-state ADDR pin.
- What are the general-purpose I/O pins used for?
The general-purpose I/O pins can be configured as either logic pins or PWM outputs.
- What are the supported bus standards for the ADT7470ARQ-REEL7?
The device supports fast I2C standard (400 kHz max) and meets SMBus 2.0 electrical specifications (fully SMBus 1.1-compliant).
- What is the supply voltage range for the ADT7470ARQ-REEL7?
The supply voltage range is from 3.0 V to 5.5 V.
- What is the standby current of the ADT7470ARQ-REEL7?
The standby current is 4 µA.
- What is the accuracy of the fan RPM-to-digital converter?
The accuracy of the fan RPM-to-digital converter is ±12%.
