SNIS218B September   2019  – June 2022 TMP390-Q1


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 TMP390-Q1 Programming Tables
      2. 7.3.2 Trip Test
      3. 7.3.3 20°C Hysteresis
    4. 7.4 Device Functional Modes
  8. Application and Implementation
    1. 8.1 Applications Information
    2. 8.2 Typical Applications
      1. 8.2.1 Simplified Application Schematic
        1. Design Requirements
        2. Detailed Design Procedure
        3. Application Curves
      2. 8.2.2 TMP390-Q1 With 10°C Hysteresis
        1. Design Requirements
        2. Detailed Design Procedure
        3. Application Curve
      3. 8.2.3 One Channel Operation for Hot Trip Point up to 124°C
        1. Application Curve
      4. 8.2.4 One Channel Operation for Cold Trip Point
        1. Application Curve
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Support Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

Detailed Design Procedure

The resistor to ground values on the SETA input sets the TTRIP threshold of Channel A. The resistor to ground value on the SETB input sets the TTRIP threshold of Channel B as well as the THYST 5°C and 10°C options. TI recommends that the resistors at SETA and SETB have a 1% tolerance at room temperature. Each resistor can range from 1.05 KΩ to 909 KΩ, representing one of 48 unique values. The exact temperature thresholds and trip points are shown in Table 7-1 and Table 7-2. The pullup resistors should be at least 1 kΩ to minimize internal power dissipation. To get the correct threshold for resistor values, take care to minimize the board level capacitance and leakage at the SETA and SETB pins.

The waveform for the TMP390-Q1 output under the hot/cold thresholds is shown in Figure 8-2. The hysteresis can be set to 5°C, 10°C or 20°C. When the temperature exceeds the hot trip point threshold, OUTA goes low until the temperature drops below the hysteresis threshold. When the temperature drops below the cold trip threshold, OUTB goes low and returns high after the temperature rises above the hysteresis threshold. If the switch has already tripped and the temperature is in the hysteresis band, a POR event will cause the output to go high after the power is restored.