Overview
The ADT7481ARMZ-REEL is a 3-channel digital thermometer and under/over temperature alarm designed by onsemi. It is intended for use in PCs, thermal management systems, and various other applications. This device can measure its own ambient temperature as well as the temperature of two remote thermal diodes, which can be located in CPUs, GPUs, or discrete diode-connected transistors. The ADT7481 communicates via a 2-wire serial interface compatible with system management bus (SMBus) standards and features an active-low ALERT output that signals when the on-chip or remote temperature exceeds programmed limits.
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 | |
| Interface | 2-wire SMBus, I2C | |
| Supply Voltage | 3V to 3.6V | V |
| Operating Supply Current | 3mA (typical at 0.0625 conversions/sec rate) | mA |
| Operating Temperature Range | -40°C to 120°C | °C |
| Storage Temperature Range | -65°C to 150°C | °C |
| Package Type | 10-lead MSOP |
Key Features
- Programmable over/under temperature limits
- Offset registers for system calibration
- Up to 2 overtemperature fail-safe active-low THERM outputs
- Active-low ALERT output for temperature limit exceedance
- One-shot and continuous measurement modes
- Standby mode for power savings
- Extended temperature measurement range of -64°C to +191°C (configurable)
Applications
- Desktop and notebook computers
- Industrial controllers
- Smart batteries
- Automotive systems
- Embedded systems
- Burn-in applications
- Instrumentation
Q & A
- What is the ADT7481ARMZ-REEL used for?
The ADT7481ARMZ-REEL is used as a 3-channel digital thermometer and under/over temperature alarm in various applications including PCs, thermal management systems, and industrial controllers.
- How many temperature channels does the ADT7481ARMZ-REEL have?
The ADT7481ARMZ-REEL has three temperature channels: one local and two remote.
- 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 interface does the ADT7481ARMZ-REEL use for communication?
The ADT7481ARMZ-REEL communicates via a 2-wire SMBus and I2C interface.
- What is the typical supply voltage and current for the ADT7481ARMZ-REEL?
The typical supply voltage is 3.3V, and the typical operating supply current is 3mA at a conversion rate of 0.0625 conversions/sec.
- What is the operating temperature range of the ADT7481ARMZ-REEL?
The operating temperature range is from -40°C to 120°C.
- What type of package does the ADT7481ARMZ-REEL come in?
The ADT7481ARMZ-REEL comes in a 10-lead MSOP package.
- Does the ADT7481ARMZ-REEL support programmable temperature limits?
- What is the purpose of the ALERT output on the ADT7481ARMZ-REEL?
The ALERT output signals when the on-chip or remote temperature exceeds the programmed limits.
- Can the ADT7481ARMZ-REEL be used in automotive applications?
