Overview
The TMP121 and TMP123, from Texas Instruments, are highly accurate digital temperature sensors. The TMP122AIDBVRG4, which is part of this family, is a variant of these sensors. These devices are SPI-compatible and come in a compact SOT23-6 package, making them ideal for various thermal management and protection applications. They require no external components for operation and offer low power consumption, making them suitable for a wide range of applications including power supply temperature monitoring, computer peripherals, and battery management.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Temperature Range | −40 | +125 | °C | |
| Accuracy (−25°C to +85°C) | ±0.5 | ±1.5 | °C | |
| Resolution | ±0.0625 | °C | ||
| Supply Voltage Range | 2.7 | 5.5 | V | |
| Quiescent Current | 35 | 50 | µA | |
| Shutdown Current | 0.1 | 1 | µA | |
| Conversion Time (12-Bit) | 240 | 320 | ms | |
| Conversion Period (12-Bit) | 480 | 640 | ms |
Key Features
- SPI-compatible interface for easy communication.
- High accuracy: ±1.5°C from −25°C to +85°C.
- Low quiescent current: 50µA (max) and low shutdown current: 1µA (max).
- Wide supply voltage range: 2.7V to 5.5V.
- Compact SOT23-6 package.
- No external components required for operation.
- 12-bit plus sign resolution with 0.0625°C resolution.
- Hardware shutdown for additional power savings.
Applications
- Power supply temperature monitoring.
- Computer peripheral thermal protection.
- Notebook computers and cell phones.
- Battery management systems.
- Office machines and other low-power applications.
- Extended thermal measurement in various communication, computer, consumer, environmental, industrial, and instrumentation applications.
Q & A
- What is the temperature accuracy of the TMP121/TMP123?
The temperature accuracy is ±1.5°C from −25°C to +85°C and ±2.0°C from −40°C to +125°C.
- What is the resolution of the temperature readings?
The resolution is 12-bit plus sign with 0.0625°C resolution.
- What is the supply voltage range for the TMP121/TMP123?
The supply voltage range is from 2.7V to 5.5V.
- How much quiescent current does the TMP121/TMP123 consume?
The quiescent current is 50µA (max) when the serial bus is inactive.
- What is the conversion time for the TMP121/TMP123?
The conversion time is typically 240-320 ms for a 12-bit resolution.
- Do the TMP121/TMP123 require any external components for operation?
No, they do not require any external components, though a 0.1µF supply bypass capacitor is recommended.
- What is the package type of the TMP121/TMP123?
The package type is SOT23-6.
- What are the typical applications of the TMP121/TMP123?
Typical applications include power supply temperature monitoring, computer peripheral thermal protection, notebook computers, cell phones, and battery management systems).
- How do the TMP121/TMP123 communicate with other devices?
The TMP121 and TMP123 communicate through an SPI-compatible serial interface).
- What is the operating temperature range of the TMP121/TMP123?
The specified operating temperature range is from −40°C to +125°C, with operation extending from −55°C to +150°C).
