Overview
The ADT7470ARQ, produced by Analog Devices Inc., is a multichannel temperature sensor and PWM fan controller designed for systems requiring active cooling. This device is capable of monitoring up to 10 daisy-chained TMP05 temperature sensors and controlling fan speeds through PWM outputs. It interfaces directly with an I2C bus and supports fast I2C standard (400 kHz max) and SMBus 2.0 electrical specifications, ensuring compatibility with a wide range of systems. The ADT7470ARQ is particularly useful in applications such as servers, networking and telecommunications equipment, and desktops, where precise temperature monitoring and fan control are crucial.
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 | ||||
| Operating Temperature | -40°C | 125°C | °C | ||
| Serial Bus Clock Frequency, fSCLK | 400 kHz | See Figure 2 |
Key Features
- PWM outputs to drive fans under software control
- FULL_SPEED input to blast fans to maximum speed by external hardware
- SMBALERT interrupt signals to indicate failures to the system controller
- Three-state ADDR pin allowing up to 3 devices on a single bus
- Temperature decoder interprets TMP05 temperature sensors and communicates values over I2C bus
- Limit comparison of all monitored values
- Supports fast I2C standard (400 kHz max) and SMBus 2.0 electrical specifications
- General-purpose I/O pins configurable as logic pins or PWM outputs
Applications
- Servers
- Networking and telecommunications equipment
- Desktops
Q & A
- What is the primary function of the ADT7470ARQ?
The ADT7470ARQ is a multichannel temperature sensor and PWM fan controller designed for systems requiring active cooling.
- How many TMP05 temperature sensors can the ADT7470ARQ monitor?
The ADT7470ARQ can monitor up to 10 daisy-chained TMP05 temperature sensors.
- What is the operating temperature range of the ADT7470ARQ?
The operating temperature range is from -40°C to 125°C.
- What is the maximum clock frequency supported by the ADT7470ARQ?
The ADT7470ARQ supports a maximum clock frequency of 400 kHz.
- Can the ADT7470ARQ be used in multiple device configurations on the same bus?
Yes, the three-state ADDR pin allows up to 3 devices on a single bus.
- What type of bus does the ADT7470ARQ interface with?
The ADT7470ARQ interfaces directly with an I2C bus and is compliant with SMBus 2.0 electrical specifications.
- What is the purpose of the FULL_SPEED input on the ADT7470ARQ?
The FULL_SPEED input allows fans to be driven to maximum speed by external hardware.
- Does the ADT7470ARQ have general-purpose I/O pins?
Yes, the ADT7470ARQ has four general-purpose I/O pins that can be configured as either logic pins or PWM outputs.
- What type of package is the ADT7470ARQ available in?
The ADT7470ARQ is available in a 16-SSOP (0.154", 3.90mm Width) package.
- Is the ADT7470ARQ still in production?
No, the ADT7470ARQ is listed as obsolete.
