SBOS335E June   2005  – December 2018 TMP300

PRODUCTION DATA.  

  1. 1Features
  2. 2Applications
  3. 3Description
    1.     Device Images
      1.      Pinout
      2.      Application Schematic
  4. 4Revision History
  5. 5Pin Configuration and Functions
    1.     Pin Functions
  6. 6Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Electrical Characteristics
    4. 6.4 Typical Characteristics
  7. 7Detailed Description
    1. 7.1 Overview
    2. 7.2 Feature Description
      1. 7.2.1 Calculating RSET
      2. 7.2.2 Using VTEMP to Trip the Digital Output
      3. 7.2.3 Analog Temperature Output
      4. 7.2.4 Using a DAC to Set the Trip Point
      5. 7.2.5 Hysteresis
  8. 8Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
    2. 8.2 Community Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  9. 9Mechanical, Packaging, and Orderable Information

Package Options

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

Using a DAC to Set the Trip Point

The trip point is easily converted by changing the digital-to-analog converter (DAC) code. This technique can be useful for control loops where a large thermal mass is being brought up to the set temperature and the OUT pin is used to control the heating element. The analog output can be monitored in a control algorithm that adjusts the set temperature to prevent overshoot. Trip set voltage error versus temperature is shown in Figure 10, which shows error in °C of the comparator input over temperature. An alternative method of setting the trip point by using a DAC is illustrated in Figure 11.

TMP300 ai_trip_err-tmp_sbos335.gifFigure 10. Trip Set Voltage Error vs Temperature
TMP300 ai_dac_test_sbos335.gifFigure 11. DAC Generates the Voltage-Driving TSET Pin