SLVUDL8 February   2026

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  6. 2Hardware
    1. 2.1 Pin Configuration of the ISOW308x Isolated RS-485/RS-422 Transceiver With Integrated DC-DC Converter Evaluation Module
    2. 2.2 EVM Setup and Operation
      1. 2.2.1 EVM Setup
  7. 3Hardware Design Files
    1. 3.1 Schematics
    2. 3.2 PCB Layout and 3D Diagram
    3. 3.3 Bill of Materials (BOM)
  8. 4Additional Information
    1. 4.1 Trademarks

2.2.1 EVM Setup

This section describes the typical setup and operation of the EVM for device evaluation. Typical EVM Test Setup shows a typical test configuration for operating the ISOW3080DWEEVM using two power supplies.

ISOW3080 Typical EVM Test Setup Figure 2-2 Typical EVM Test Setup

ISOW3080DWEEVM has many DNP resistors which can be populated or unpopulated along with 3-pin jumper options to setup the EVM to desired operating test conditions. Component Configurations lists and describes all the possible test configurations that can be achieved by populating various resistors and jumper options.

Table 2-1 Component Configurations
Component Description
R1 The resistor connects LDOs U1, U2 inputs together allowing only one power supply to be used instead of two power supplies.
R2, R15, R18 Populating R15 bypasses LDO U1 allowing VDD to be powered directly from external power supply. When R15 is populated, R2 and R18 needs to be unpopulated to disconnect the LDO. When LDO is not bypassed, the recommended input voltage to LDO is between 9V and 12V
R5, R7, R9, R11, R13 Sets LDO U1 output voltage to 5V or 3.3V for VDD1. Populate only R5 and R9 with 0Ω resistors to set LDO U1 output voltage to 5V. Populate only R7, R11 and R13 with 0Ω resistors to set LDO U1 output voltage to 3.3V(Default Configuration).
R3, R16, R19 Populating R16 bypasses LDO U2 allowing VDDL to be powered directly from external power supply. When R16 is populated, R3 and R19 needs to be unpopulated to disconnect the LDO. When LDO is not bypassed, the recommended input voltage to LDO is between 9V and 12V.
R4, R6, R8, R10, R12, R14 Sets LDO U2 output voltage to 5V or 3.3V or 2.5V for VDDL. Populate only R4 and R10 with 0Ω resistors to set LDO U2 output voltage to 5V. Populate only R6, R12 and R14 with 0Ω resistors to set LDO U2 output voltage to 3.3V(Default Configuration). Populate only R8, R12 and R14 with 0Ω resistors to set LDO U2 output voltage to 2.5V.
R17 The resistor connects oscillator U3 output signal to U4 input D of ISOW3080, allowing EVM to be tested using a test signal without needing any external test signal input.
R20, R21 Populating R20 sets U3 output signal rate to 500Kbps(Default Configuration) and populating R21 sets the rate to 12Mbps.
R30, R31 These resistors allow shorting Y/Z and A/B on EVM to enable half-duplex configuration out of the full-duplex capable device.
L10, L11 Common-Mode Choke(CMC) on RS485 bus. If populating L10 then remove R26 and R27. If populating L11 then remove R28 and R29.
R26, R27, R28, R29 Populating R26 and R27 bypasses the CMC L10 on A/B Populating R28 and R29 bypasses the CMC L11 on Y/Z
R32, R34, R35, R37 Optional footprints for external fail safe biasing. ISOW3080 has internal failsafe biasing enabled, hence DNP.
R38, R39, R40, R41 Populate these for split termination configuration on A/B and Y/Z.
C32, C33 Populate these for split termination configuration on A/B and Y/Z.
D1, D2 Optional SOT-23 footprints for TVS Diode installation.
R42, R43 Optional resistors which can be populated to extract ILOAD from VISOOUT when RS485 is not in use. Do not populate when using RS485 functionality.
C18. C19, C20, C21 Optional capacitors for noise filtering on digital signal lines on Side1.
J3 Don't use jumper to connect any pins. This just acts as an additional probe point for probing output R of ISOW3080
J4 Connect this jumper between the middle pin and GND1 to tie the input D pin low. Connect this jumper between the middle pin and VDDL to tie the input D pin high.
J5 Connect this jumper between the middle pin and GND1 to tie the DE pin low. The driver input is disabled when the DE pin is low. Connect this jumper between the middle pin and VDDL to tie the DE pin high. The driver input is enabled when the DE pin is high.
J6 Connect this jumper between the middle pin and GND1 to tie the RE pin low. The receiver is enabled when the RE pin is low.. Connect this jumper between the middle pin and VDDL to tie the RE pin high. The receiver is disabled when the RE pin is high
J7 Jumper option to power ON or OFF the U3 oscillator.