Overview
The TMP112NAIDRLR from Texas Instruments is a high-accuracy, low-power digital temperature sensor. It is part of the TMP112 family, which is designed to replace NTC/PTC thermistors in applications requiring high accuracy. The TMP112 family offers various versions, including the TMP112A, TMP112B, TMP112Dx, and TMP112N, each optimized for different supply voltages and accuracy levels. These sensors are highly linear and do not require complex calculations or lookup tables to derive the temperature. They feature a 12-bit ADC with a resolution of 0.0625°C and operate over a wide temperature range of –40°C to 125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Temperature Range | –40 to 125 | °C |
| Accuracy (TMP112A) | ±0.5 (0°C to 65°C at 3.3V), ±1.0 (–40°C to 125°C) | °C |
| Accuracy (TMP112B) | ±0.5 (0°C to 65°C at 1.8V), ±1.0 (–40°C to 125°C) | °C |
| Accuracy (TMP112N) | ±1.0 (–40°C to 125°C) | °C |
| Supply Voltage Range | 1.4 to 3.6 | V |
| Resolution | 12 Bits (0.0625°C) | |
| Interface Compatibility | SMBus, Two-Wire, I2C | |
| Quiescent Current | Typical 3.2µA (at 1-Hz), Maximum 7.5µA (active), 0.35µA (shutdown) | µA |
| Package Options | SOT563 (1.6mm × 1.6mm), X2SON (0.8mm × 0.8mm) |
Key Features
- High accuracy without calibration: ±0.5°C (maximum) from 0°C to 65°C and ±1.0°C (maximum) from –40°C to 125°C for TMP112A and TMP112B, and ±1.0°C for TMP112N.
- Low power consumption with a typical quiescent current of 3.2µA at 1-Hz and a maximum of 7.5µA in active mode, and 0.35µA in shutdown mode.
- Wide supply voltage range of 1.4V to 3.6V.
- 12-bit ADC resolution providing 0.0625°C resolution.
- Compatibility with SMBus, Two-Wire, and I2C interfaces.
- NIST-traceable accuracy.
- Compact packaging options including SOT563 (1.6mm × 1.6mm) and X2SON (0.8mm × 0.8mm).
- Support for up to four devices on a single bus with address select pin.
- Overtemperature alert function with open-drain output.
Applications
- Building automation: occupancy detection, video doorbells, wireless environmental sensors for HVAC systems.
- Factory automation and control: machine vision cameras, industrial PCs, single-board computers, PLC controllers.
- Cold chain monitoring.
- Data center and enterprise computing: solid-state drives (SSDs), rack server motherboards.
- Personal electronics: PCs, notebooks, tablets, digital still and video cameras, augmented reality glasses, smart speakers.
Q & A
- What is the temperature accuracy of the TMP112A?
The TMP112A has an accuracy of ±0.5°C (maximum) from 0°C to 65°C at 3.3V and ±1.0°C (maximum) from –40°C to 125°C.
- What are the supply voltage range and quiescent current of the TMP112?
The supply voltage range is 1.4V to 3.6V, and the typical quiescent current is 3.2µA at 1-Hz, with a maximum of 7.5µA in active mode and 0.35µA in shutdown mode.
- What interfaces does the TMP112 support?
The TMP112 supports SMBus, Two-Wire, and I2C interfaces.
- What is the resolution of the TMP112's ADC?
The resolution is 12 bits, providing a resolution of 0.0625°C.
- Is the TMP112 NIST-traceable?
- What are the package options for the TMP112?
The TMP112 is available in SOT563 (1.6mm × 1.6mm) and X2SON (0.8mm × 0.8mm) packages.
- Can multiple TMP112 devices be connected on the same bus?
- Does the TMP112 have an overtemperature alert function?
- What are some common applications of the TMP112?
- How does the TMP112 handle thermal paths?
