Texas Instruments THVD1424, Руководство пользователя

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Table 3-1. Component Overview (continued)
Jumper ID Function Package Comment Installed?
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.
3.1.1 Powering the Boarde
3.1.1.1 Single Supply Operation
The THVD1424 has both a VCC pin (used for the RS-485 bus pins) and VL pin (Used for console facing pins). In
single supply operation mode for the THVD1424 the VL pin should be shorted to VCC by shorting the J7 header
pins, so that the digital logic circuits connected to the Logic supply are properly powered.
Table 3-2. Single Supply Operation Configuration Table
Component ID Comment
J5 Leave V
L
terminal Open
J6 Attach V
CC
(3 V to 5.5 V) to Terminal
J7 Short Jumper to make sure V
L
= V
CC
C2, C3, C4, and C5 Leave Uninstalled
C6 and C8 If More Decoupling Capacitance is Desired Attach Capacitors to C6
and C8
R15 Install Resistor if Low impedance pathway between GND and
EARTH is desired
To apply power onto the board, VCC is applied through the J6 terminal. With the board oriented with J6 on
the top of the board, as shown in figure 1.1, the signals are, from right to left, EARTH, GND, and V
CC
. The
EARTH and GND distinction are used to help the end user determine operational qualities w.r.t. ground potential
differences. If testing methods on reducing ground loop current install a resistor on pad R15. Check data sheet
for proper powering considerations as this will either recommend 3.3V, 5V or 3.3V to 5V.
www.ti.com Board Description
SLLU356 – SEPTEMBER 2022
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THVD1424 Evaluation Module (EVM) User Guide 7
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