SLLU376 December   2023

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Board Components and Pad Overview
    2. 2.2 Power Requirements
    3. 2.3 Default Operational Mode
    4. 2.4 Single Ended Bus (Controller Side) Modification Options
    5. 2.5 Differential Bus (RS-485) Modification Options
  8. 3Hardware Design Files
    1. 3.1 Schematics
    2. 3.2 PCB Layouts
    3. 3.3 Bill of Materials (BOM)
  9. 4Additional Information
    1. 4.1 Trademarks
  10. 5References

2.1 Board Components and Pad Overview

The RS485FLDPLXDRCEVM Comes Ready to Operate Directly Out of Box with a THVD2412DRCR installed at U1. All the Signal and Power Jumpers/Inputs (J1 – J15) come pre-installed on board.

Table 2-1 Jumpers
Jumper ID Function Package Installed?
J1

R Pin Output

8 Pin Header

Yes
J2

/RE Input

8 Pin Header

Yes
J3

DE Input

8 Pin Header

Yes
J4

D Pin Output

8 Pin Header

Yes
J5

VCC Power Input

3 Pin Terminal Block

Yes
J6

Common Mode Input Connection for A and B

4 Pin Header

Yes
J7

Common Mode Input Connection for A

4 Pin Header

Yes
J8

Common Mode Input Connection for B

4 Pin Header

Yes
J9

Differential Bus Jumper (A,B)

4 Pin Header

Yes
J10

Differential Bus Jumper (A,B)

4 Pin Header

Yes
J11

Differential Receiver Input Terminal Block

3 Pin Terminal Block

Yes
J12

Differential Bus Jumper (Y,Z)

4 Pin Header

Yes

J13

Differential Bus Jumper (Y,Z)

4 Pin Header

Yes

J14

Differential Driver Output Terminal Block

3 Pin Terminal Block

Yes

J15

Common Mode Input Connection for Y and Z

4 Pin Header

Yes

J16

Common Mode Input Connection for Y

4 Pin Header

Yes

J17

Common Mode Input Connection for Z

4 Pin Header

Yes
Table 2-2 Resistors
Resistor ID Function Package Comment Installed?
R1 0 Ω connection series resistor 0603 For R Pin Yes
R2 Pull up resistor 0603 For R Pin No
R3 Current limiting resistor for diode 0603 For R LED D1 (R pin) Yes
R4 0 Ω connection series resistor 0603 For Enable 1 (DE on DRC Pkg and /RE on D Pkg) Yes
R5 Pull up resistor 0603 For Enable 1 (DE on DRC Pkg and /RE on D Pkg) No
R6 Pull down resistor 0603 For Enable 1 (DE on DRC Pkg and /RE on D Pkg) No
R7 0 Ω connection series resistor 0603 For Enable 2 (/RE on DRC Pkg and DE on D Pkg) Yes
R8 Pull up resistor 0603 For Enable 2 (/RE on DRC Pkg and DE on D Pkg) No
R9 Pull down resistor 0603 For Enable 2 (/RE on DRC Pkg and DE on D Pkg) No
R10 0 Ω connection series resistor 0603 For D Pin Yes
R11 Pull up resistor 0603 For D Pin No
R12 Pull down resistor 0603 For D Pin No
R13 Current limiting resistor for diode 0603 For D LED D2 (D Pin) Yes
R14 GND to EARTH pull down for VCC supply 0603 N/A No
R15 Current limiting resistor for diode 0603 For VCC LED (D3) Yes
R16 120 Ω termination resistor 0805 Needed for RS-485 applications (Terminal Nodes) No
R17

0 Ω connection series resistor “A” line

 0603 N/A Yes
R18 0 Ω series connection resistor “B” Line 0603 N/A Yes
R19 120 Ω Termination Resistor 0805 Needed for RS-485 applications (Terminal Nodes) No
R20 0 Ω Connection Series Resistor “Z” line 0603 N/A Yes
R21 0 Ω series connection resistor “Y” line 0603 N/A Yes
R22

Common mode load “A” line

0603

N/A

 No
R23

Common mode load “B” line

0603

N/A

 No
R24

Common mode load “Z” line

0603

N/A

 No
R25

Common mode load “Y” line

0603

N/A

 No
Table 2-3 Capacitors
Capacitor ID Function Package Comment Installed?
C1 Load capacitance for “R” 0603 N/A No
C2 47uF | 10 V decoupling capacitor 0805 From GND to EARTH on VCC Supply Yes
C3 10uF | 6.3V decoupling capacitor 0805 From GND to EARTH on VCC supply Yes
C4 47uF | 10 V decoupling capacitor 0805 From VCC to GND on VCC Supply Yes
C5 10uF | 6.3V decoupling capacitor 0805 FROM VCC to GND on VCC Supply Yes
C6 100 nF | 6.3V decoupling capacitor 0603 From VCC pin on U1 to GND Yes
C7 100 nF | 25 V decoupling capacitor 0603 Common mode supply capacitance No
C8 100 nF | 25 V decoupling capacitor 0805 Common mode supply capacitance No
C9 100 nF | 25 V termination capacitor 0805 Optional termination capacitance No
C10 100 nF | 25 V termination capacitor 0603 Optional termination capacitance No
C11 100 nF | 25 V decoupling capacitor 0603 Common mode supply capacitance No
C12 100 nF | 25 V decoupling capacitor 0603 Common mode supply capacitance No
Table 2-4 LEDs
LED ID Function Package Comment Installed?
D1 “R” Line LED – Red Non-Standard N/A Yes
D2 “D” Line LED – Green Non-Standard N/A Yes
D3 “VCC” LED – Blue Non-Standard N/A Yes
Table 2-5 ICs
IC ID Function Package Comment Installed?
U1 Full Duplex RS-485 IC in DRC (10 Pin VSSON) Package DRC Comes pre-installed with THVD2412DRC Yes

The default setup is optimized to work with the THVD2412DRCR operating without a common mode voltage.