SNIU033 May   2019 TMP390

 

  1.   TMP390EVM User's Guide
    1.     Trademarks
    2. 1 Overview
      1. 1.1 TMP390EVM Kit Contents
    3. 2 EVM Hardware Overview and Operation
      1. 2.1 Power Input and Regulation
      2. 2.2 Perforated Breakout Board
      3. 2.3 Dual-Channel Resistor Programmable Trip Points
      4. 2.4 Manual Trip Test and Reset
      5. 2.5 Open-Drain Output
    4. 3 Board Layout
    5. 4 Schematic and Bill of Materials

2.5 Open-Drain Output

Pullup resistors are located at the open-drain OUTA and OUTB outputs. TI recommends to tie the pullup voltage to the VDD of the TMP390. If this is not possible, however, an external voltage may be used for VDDIO that must be less than or equal to VDD of the TMP390. To connect an external VDDIO, the 0-Ω resistor at R7 may be desoldered to remove connection to VDD, then resoldered at R9 to connect an external supply at TP5 as shown in Figure 6.