Overview
The TMP20 device, produced by Texas Instruments, is a CMOS, precision analog output temperature sensor. It is available in compact packages such as the 5-lead SC70 and 6-lead SOT-563, which minimize the required board space. The TMP20 operates over a wide temperature range of –55°C to +130°C with supply voltages from 2.7 V to 5.5 V, and it can also operate at lower voltages down to 1.8 V for temperatures between 15°C and 130°C. This sensor is designed for low power consumption, with a quiescent current of 4 µA (maximum) and a shutdown current of less than 20 nA when V+ is less than 0.5 V.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Operating Temperature Range | –55°C to +130°C | |
| Supply Voltage Range | 2.7 V to 5.5 V | |
| Supply Voltage (Low) | 1.8 V to 5.5 V | For temperatures between 15°C and 130°C |
| Quiescent Current | 2.6 µA to 4 µA | V+ = 5.5 V, TA = 25°C to 130°C |
| Shutdown Current | < 20 nA | V+ < 0.5 V |
| Temperature Accuracy | ±2.5°C | Across the entire specified temperature range |
| Temperature Sensitivity | –11.77 mV/°C (typical) | |
| Output Voltage at 0°C | 1.8639 V (typical) | |
| Output Resistance | 10 Ω | When sinking currents |
| Load Regulation | 6 mV | –600 µA ≤ ILOAD ≤ 600 µA |
| Maximum Capacitive Load | 1 nF | |
| Thermal Resistance (SC70) | 185 °C/W | |
| Thermal Resistance (SOT-563) | 238 °C/W | |
| Self-Heating | < 0.01 °C |
Key Features
- Precision Analog Output: The TMP20 provides a linear transfer function with a typical slope of –11.77 mV/°C and an output voltage of 1.8639 V at 0°C.
- Low Power Consumption: The device operates with a quiescent current of 4 µA (maximum) and a shutdown current of less than 20 nA.
- Compact Packaging: Available in 5-lead SC70 and 6-lead SOT-563 packages, reducing the overall required board space.
- Wide Operating Range: Operates from –55°C to +130°C with supply voltages from 2.7 V to 5.5 V, and down to 1.8 V for temperatures between 15°C and 130°C.
- High Accuracy: Maintains an accuracy of ±2.5°C across the entire specified temperature range.
- Low Self-Heating: Self-heating is limited to less than 0.01 °C.
Applications
- HVAC Systems: For temperature monitoring and control in heating, ventilation, and air conditioning systems.
- Thermal Monitoring: In various industrial and consumer electronics to monitor temperature.
- Disk Drives: To ensure optimal operating temperatures in hard disk drives and other storage devices.
- Appliances and White Goods: For temperature control and monitoring in household appliances.
- Automotive Systems: For temperature sensing in automotive applications.
Q & A
- What is the operating temperature range of the TMP20? The TMP20 operates from –55°C to +130°C.
- What are the supply voltage ranges for the TMP20? The TMP20 can operate with supply voltages from 2.7 V to 5.5 V, and down to 1.8 V for temperatures between 15°C and 130°C.
- What is the quiescent current of the TMP20? The quiescent current is 2.6 µA to 4 µA when V+ = 5.5 V.
- How accurate is the TMP20 temperature sensor? The TMP20 maintains an accuracy of ±2.5°C across the entire specified temperature range.
- What is the typical temperature sensitivity of the TMP20? The temperature sensitivity is –11.77 mV/°C.
- What is the output voltage at 0°C for the TMP20? The output voltage at 0°C is typically 1.8639 V.
- How much self-heating does the TMP20 experience? The self-heating is limited to less than 0.01 °C.
- What are the recommended power supply bypassing practices for the TMP20? Power supply bypassing is optional but recommended in noisy systems to decrease noise coupling to the output.
- Can the TMP20 drive capacitive loads? Yes, the TMP20 can drive up to 1 nF of load capacitance while sourcing and sinking 600 µA.
- What are the typical applications of the TMP20? The TMP20 is used in HVAC systems, thermal monitoring, disk drives, appliances, and automotive systems.
