Part Number: TMP122
Function: 1.5°C Accurate Programmable Digital Temperature Sensor
Package: SOT23-6 and SO-8 Type
Manufacturer: Burr-Brown (Texas Instruments)
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Description
TMP122 is a digital temperature sensor with an SPI-compatible interface, designed for accurate and low-power thermal monitoring across a wide temperature range. It integrates sensing, A/D conversion, and digital communication into a compact device, making it suitable for embedded systems, industrial control, and portable electronics.
Requiring only a pull-up resistor for complete function, the TMP122 and TMP124 temperature sensors are capable of measuring temperatures within 2°C of accuracy over a temperature range of –40°C to +125°C, with operation up to 150°C.
Programmable resolution, programmable set points and shutdown function provide versatility for any application. Low supply current and a supply range from 2.7V to 5.5V make the TMP122 and TMP124 excellent candidates for low power applications. The TMP122 and TMP124 are ideal for extended thermal measurement in a variety of communication, computer, consumer, environmental, industrial, and instrumentation applications.
Features
- SPI-compatible digital interface
- Programmable resolution: 9-bit to 12-bit + sign
- High accuracy:
- ±1.5°C (–25°C to +85°C max)
- ±2.0°C (–40°C to +125°C max)
- Low quiescent current: ~50 µA
- Wide supply voltage: 2.7V to 5.5V
- Supports operation up to 150°C
- Programmable high/low temperature setpoints
- Shutdown mode for power saving
- Compact packages: SOT23-6, SO-8
Pinout
Functional Description
- Measures temperature using an internal sensor and converts it into digital data via integrated ADC
- Communicates temperature data through SPI interface (clock, data, chip select)
- Resolution is configurable, allowing trade-off between precision and conversion time
- Includes programmable threshold registers for thermal alert or control systems
Interface Notes
- SPI-compatible (typically 3-wire or 4-wire configuration)
- Requires only a pull-up resistor for proper operation
- Easy integration with MCU, DSP, or FPGA systems
Design Notes
- Place sensor close to heat source for accurate measurement
- Avoid PCB thermal gradients and self-heating effects
- Use proper grounding and decoupling to minimize noise on SPI lines
- Configure resolution based on required response time vs accuracy
- Utilize shutdown mode in battery-powered applications
How to Choose This Sensor
- Choose when SPI interface is preferred over I²C
- Suitable for moderate accuracy (±1.5~2°C) applications
- Ideal for low-power and space-constrained designs
- Consider TMP124 for similar functionality with package variation
Typical Applications
- Notebook and desktop thermal management
- Industrial temperature monitoring
- Power supply thermal protection
- Environmental sensing systems
- Instrumentation and measurement equipment
Alternative / Equivalent Products
- TMP124 (similar with different packaging)
- LM75 (I²C interface alternative)
- TMP102 (ultra-low power I²C sensor)
- ADT7310 (higher accuracy SPI temperature sensor)
Other data sheets are available within the file:
TMP122AIDBVR, TMP122AIDBVRG4, TMP122AIDBVT, TMP122AIDBVTG4
TMP122 Datasheet PDF Download
