Overview
The ADT7481ARMZ is a 3-channel digital thermometer and under/over temperature alarm produced by Analog Devices Inc. It is designed for use in PCs and thermal management systems, enabling the measurement of its own ambient temperature as well as the temperature of two remote thermal diodes. These thermal diodes can be located in a CPU, GPU, or as discrete diode-connected transistors. The device communicates over a 2-wire serial interface compatible with System Management Bus (SMBus) standards, making it versatile for various applications requiring precise temperature monitoring and alarm functions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 3 | - |
| Resolution (Remote Channels) | 0.25°C | - |
| Accuracy (Remote Channels) | ±1°C | - |
| Resolution (Local Channel) | 1°C | - |
| Accuracy (Local Channel) | ±1°C | - |
| Temperature Measurement Range (Default) | 0°C to +127°C | - |
| Extended Temperature Measurement Range | −64°C to +191°C | - |
| Interface | 2-wire SMBus | - |
| Supply Voltage (VDD) | 3.3V (typ) | V |
| Average Operating Supply Current | 3mA (typ) at 0.0625 conversions/sec rate | mA |
| Storage Temperature Range | -65°C to 150°C | °C |
| Package Type | 10-lead MSOP | - |
Key Features
- 1 local and 2 remote temperature sensors
- 0.25°C resolution and ±1°C accuracy on remote channels
- 1°C resolution and ±1°C accuracy on local channel
- Extended, switchable temperature measurement range from 0°C to +127°C (default) or −64°C to +191°C
- 2-wire SMBus serial interface with SMBus ALERT support
- Programmable over/under temperature limits
- Offset registers for system calibration
- Up to 2 overtemperature fail-safe active-low THERM outputs
- ALERT output signals when the on-chip or remote temperature is outside the programmed limits
Applications
- Desktop and notebook computers
- Industrial controllers
- Smart batteries
- Automotive systems
- Embedded systems
- Burn-in applications
- Instrumentation
Q & A
- What is the primary function of the ADT7481ARMZ?
The ADT7481ARMZ is a 3-channel digital thermometer and under/over temperature alarm designed for use in PCs and thermal management systems.
- How many temperature channels does the ADT7481ARMZ support?
The ADT7481ARMZ supports one local and two remote temperature channels.
- What is the resolution and accuracy of the remote temperature channels?
The remote temperature channels have a resolution of 0.25°C and an accuracy of ±1°C.
- What is the default temperature measurement range of the ADT7481ARMZ?
The default temperature measurement range is from 0°C to +127°C, but it can be extended to −64°C to +191°C.
- What interface does the ADT7481ARMZ use for communication?
The ADT7481ARMZ communicates over a 2-wire SMBus serial interface.
- What is the typical supply voltage for the ADT7481ARMZ?
The typical supply voltage is 3.3V.
- What is the average operating supply current of the ADT7481ARMZ?
The average operating supply current is 3mA at a conversion rate of 0.0625 conversions per second.
- What is the storage temperature range for the ADT7481ARMZ?
The storage temperature range is from -65°C to 150°C.
- In what package type is the ADT7481ARMZ available?
The ADT7481ARMZ is available in a 10-lead MSOP package.
- What are some common applications of the ADT7481ARMZ?
Common applications include desktop and notebook computers, industrial controllers, smart batteries, automotive systems, embedded systems, burn-in applications, and instrumentation.
