SLLU356 September   2022 THVD1424

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2Information on Cautions and Warnings
  5. 3Board Description
    1. 3.1 Board Component Overview
      1. 3.1.1 Powering the Boarde
        1. 3.1.1.1 Single Supply Operation
        2. 3.1.1.2 Dual Supply Operation (Separate Digital Logic and Driver supplies)
        3. 3.1.1.3 Default Operation Mode
        4. 3.1.1.4 Single Ended Bus Modification Operational Modes
  6. 4Design Documents
    1. 4.1 Schematics
    2. 4.2 Board Layout
    3. 4.3 Bill Of Materials
  7. 5Revision History

3.1 Board Component Overview

The THVD1424EVM is ready to operate directly out of Box with a THVD1424EVM installed at U1. All the Signal and Power Jumpers/Inputs (J1 – J20) come pre-installed on board. See Table 3-1 for description for every pad on the board and if it comes pre-installed by default.

Table 3-1 Component Overview
Jumper ID Function Package Comment Installed?
J1 “R” Pin output 4x2 Header N/A Y
J2 “/RE” Pin Input 4x2 Header N/A Y
J3 “DE” Pin Input 4x2 Header N/A Y
J4 “D” Pin Input 4x2 Header N/A Y
J5 VL Terminal Terminal Block N/A Y
J6 VCC Terminal Terminal Block N/A Y

J7

 VL to VCC Jumper 2x1 Header N/A Y
J8 Control Signal Jumper 10x2 Header N/A Y
J9 RX Common Mode Input 4x1 Header N/A Y
J10 “A” Line Common Mode Input 4x1 Header N/A Y
J11 “B” Line Common Mode Input 4x1 Header N/A Y
J12 RX Header #1 4x1 Header Between Series Resistor and IC Y
J13 RX Header #2 4x1 Header Between Series Resistor and Terminal Y
J14 RX Terminal Terminal Block N/A Y
J15 TX Header #1 4x1 Header Between Series Resistor and IC Y
J16 TX Header #2 4x1 Header Between Series Resistor and Terminal Y
J17 TX Terminal Terminal Block N/A Y
J18 TX Common Mode Input 4x1 Header N/A Y
J19 “Y” Line Common Mode Input 4x1 Header N/A Y
J20 “Z” Line Common Mode Input 4x1 Header N/A Y
Resistor ID Function Package Comment Installed?
R1 0 Ohm Series Resistor 0603 N/A Y
R2 Pull-Up Resistor 0603 N/A N
R3 LED Current Limiting Resistor 0603 N/A Y
R4 0 Ohm Series Resistor 0603 N/A Y
R5 Pull-Up Resistor 0603 N/A N
R6 Pull-Down Resistor 0603 N/A N
R7 0 Ohm Series Resistor 0603 N/A Y
R8 Pull-Up Resistor 0603 N/A N
R9 Pull-Down Resistor 0603 N/A N
R10 0 Ohm Series Resistor 0603 N/A Y
R11 Pull-Up Resistor 0603 N/A N
R12 Pull-Down Resistor 0603 N/A N
R13 LED Current Limiting Resistor 0603 N/A Y
R14 GND to EARTH Resistor 0603 N/A N
R15 GND to EARTH Resistor 0603 N/A N
R16 LED Current Limiting Resistor 0603 N/A Y
R17 0 Ohm Series Resistor 0603 N/A Y
R18 0 Ohm Series Resistor 0603 N/A Y
R19 “A” Common Mode Resistor 0603 Must be >= 375 Ohms if Installed N
R20 “B” Common Mode Resistor 0603 Must be >= 375 Ohms if Installed N
R21 0 Ohm Series Resistor 0603 N/A Y
R22 0 Ohm Series Resistor 0603 N/A Y

R23

“Y” Common Mode Resistor

 0603 Must be >= 375 Ohms if Installed N
R24 “Z” Common Mode Resistor 0603

Must be >= 375 Ohms if Installed

 N
R25 External RX Termination 0805 Used for Short Bus Power Consumption Test N
R26 External TX Termination 0805 Used for Short Bus Power Consumption Test N
Capacitor ID Function Package Comment Installed?
C1 Capacitive Loading for “R” pin 0603 N/A N
C2 VL Supply Decoupling Cap 0805 N/A N
C3 VL Supply Decoupling Cap 0805 N/A N

C4

VL Supply Decoupling Cap

 0805 N/A N
C5 VL Supply Decoupling Cap 0805 N/A N
C6 VCC Supply Decoupling Cap 0805 N/A N
C7 VCC Supply Decoupling Cap 0805 N/A Y
C8 VCC Supply Decoupling Cap 0805 N/A N
C9 VCC Supply Decoupling Cap 0805 N/A Y
C10 VCC Supply Decoupling Cap 0603 HF Decoupling – Close to IC Package Y
C11 VL Supply Decoupling Cap 0603

HF Decoupling – Close to IC Package

 Y
C12 Common Mode Decoupling Cap “A” Line 0805 N/A N
C13 Common Mode Decoupling Cap “B” Line 0805 N/A N
C14 Termination Capacitor RX 0805 N/A N
C15 Termination Capacitor TX 0805 N/A N
C16 Common Mode Decoupling Cap “Y” Line 0805 N/A N
C17 Common Mode Decoupling Cap “Z” Line 0805 N/A N
LED ID Function Package Comment Installed?
D1 “R” Line LED – Red Non-Standard N/A Y
D2 “D” Line LED – Green Non-Standard N/A Y
D3 “VCC” LED – Blue Non-Standard N/A Y
IC ID Function Package Comment Installed?
U1 RS-485 Transceiver VSON (DRC) THVD1424 Y

The default setup is optimized to work with the THVD1424. Operating in a single supply mode without a common mode voltage. By shorting header J7 (VL = VCC), with control signals being applied externally at J2-J4 and J8 or by using the headers J2-J4 and J8 to shunt to associated pin to GND or VCC/VL. The board is ready to operate in its default state. See Single Supply Operation and Dual Supply Operation for information on power supplies and operational modes of the board respectively.