SNOU204 October   2024

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Overview
    2. 2.2 Perforations and Connectivity
    3. 2.3 Status LEDs (D3, D5, D6) and Subregulator
    4. 2.4 Programming Header
    5. 2.5 BSL Button
    6. 2.6 Remote BJT - Q1
    7. 2.7 Address Jumpers
    8. 2.8 Current Measurement - SEL Measurement
  9. 3Software
    1. 3.1 Software Installation
      1. 3.1.1 Live Software on dev.ti.com
      2. 3.1.2 Download from dev.ti.com
    2. 3.2 Home Tab
    3. 3.3 Data Capture Tab
    4. 3.4 Registers Tab
  10. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials
  11. 5Additional Information
    1. 5.1 Trademarks

2.6 Remote BJT - Q1

Q1 is a MMBT3904LP NPN BJT. This is used as the remote temperature sensor on the EVM. The MMBT3904LP typically has an N-factor of about 1.0042. The TMP9R01 assumes an N-Factor of 1.008, which can cause a temperature error in the remote temperature reading. The GUI automatically sets the N-Factor correction register to 1.0042 to compensate for this. If the device is reset, then the device sets the N-Factor correction register back to the default value or 1.008 and a temperature error can be seen. If a remote temperature error is seen, then use the N-Factor correction feature to adjust the temperature reading. The MMBT3904LP can also be broken off to allow the engineer to connect a different temperature remote to the device.