Texas Instruments THVD24X2VEVM Bedienungsanleitung
EVM User's Guide: THVD24X2VEVM
THVD24X2VEVM User's Guide
Parker Dodson
Description
This EVM user’s guide for the THVD24X2VEVM provides a quick method to evaluate TI’s THVD24X2V family
of full duplex transceivers in a SOIC package. This EVM user’s guide describes the THVD24X2VEVM and the
intended use of the evaluation module.
Features
• Ready to use out-of-box with THVD2452VDR preinstalled
• Two 10-µF and two 47-µF decoupling capacitors installed on VCC to GND and GND to EARTH connections
• Resistor pad available to create resistive link between GND and EARTH connections
• Common-mode voltage connection points to test device with multiple common-mode voltages
Figure 1-1. THVD24X2VEVM Top View
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1 Evaluation Module Overview
1.1 Kit Contents
The THVD24X2VEVM is ready to operate directly out-of-box with a THVD2452VDR transceiver in a D package
installed at site U1 on the board. In addition to the preinstalled THVD2452VDR, the following tables describe
each pad on the THVD24X2VEVM board and which components are already installed by default.
Table 1-1 describes the jumpers (J1 through J20) that are preinstalled on the THVD24X2VEVM board and the
function of the jumper for operating the EVM.
Table 1-1. Jumper Pads on the THVD24X2VEVM Board
Jumper Name Function Package Comment
J1 VIO supply input 3 pin terminal block N/A
J2 VCC supply input 3 pin terminal block N/A
J3 RX common-mode input 4-pin header N/A
J4 RX “B” pin common-mode input 4-pin header N/A
J5 RX “A” pin common-mode input 4-pin header N/A
J6 R pin output 8-pin header N/A
J7 Shunt to short VCC = VIO 2-pin header Shunt J7 for single supply application
J8 Common-mode + RX bus connection point 4-pin header N/A
J9 Input header A/B pins 4-pin header N/A
J10 RX bus external connection terminal 3-pin terminal block N/A
J11 “/RE” pin input 8-pin header N/A
J12 “DE” pin input 8-pin header N/A
J13 TX bus external connection terminal 3-pin terminal block N/A
J14 Common-mode + TX bus connection point 4-pin header N/A
J15 Output header Y/Z pins 4-pin header N/A
J16 “D” pin input 8-pin header N/A
J17 TX common-mode input 4-pin header N/A
J18 TX “Y” pin common-mode input 4-pin header N/A
J19 TX “Z” pin common-mode input 4-pin header N/A
J20 SLR control input 8-pin header Can be shunted to VIO or GND using J20
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Table 1-2 describes the pads on the THVD24X2VEVM board where resistors are installed by default and pads
where additional resistors can be added.
Table 1-2. Resistor Pads on the THVD24X2VEVM Board
Pad Name Function Package Comment Installed?
R1 0-Ω resistor 0603 Connection between J6 and "R" pin on U1 Yes
R2 Pullup resistor pad 0603 Ability to pull up "R" pin output No
R3 Current limiting resistor for LED 0603 Limits current on "R" pin LED (D1) Yes
R4 0-Ω resistor 0603 Connection between J11 and “/RE” pin of U1 Yes
R5 Pulldown resistor pad 0603 Ability to pull down “/RE” pin output No
R6 Pullup Resistor Pad 0603 Ability to pull up “/RE” pin output No
R7 0-Ω resistor 0603 Connection between J12 and “DE” pin for U1 Yes
R8 Pullup resistor pad 0603 Ability to pull up “DE” pin output No
R9 Pulldown resistor pad 0603 Ability to pull down “DE” pin output No
R10 0-Ω resistor 0603 Connection between J16 and “D” pin of U1 Yes
R11 Pullup resistor pad 0603 Ability to pull up “D” pin output No
R12 Pulldown resistor pad 0603 Ability to pull down “D” pin output No
R13 Current limiting resistor for LED 0603 Limits current on “D” pin LED (D2) Yes
R14 Current limiting resistor for LED 0603 Limits current on “VCC” pin LED (D3) Yes
R15 GND to EARTH resistor pad 0603 Located on VIO Supply (J1) No
R16 GND to EARTH resistor pad 0603 Located on VCC Supply (J2) No
R17 Common-mode loading resistor 0603 “A” Pin common-mode loading resistor; minimum
value is 375 Ω
Yes
R18 0-Ω resistor 0603 “A” Pin bus connection resistor to output terminal Yes
R19 A-B termination resistor pad 0805 120-Ω nominal resistance recommended if added No
R20 0-Ω resistor 0603 “B” Pin bus connection resistor to output terminal Yes
R21 Common-mode loading resistor 0603 “B” Pin common-mode loading resistor; minimum
value is 375 Ω
No
R22 Common-mode loading resistor 0603 “Z” Pin common-mode loading resistor; minimum
value is 375 Ω
No
R23 0-Ω resistor 0603 “Z” Pin Bus Connection Resistor to Output Terminal Yes
R24 Y-Z termination resistor pad 0805 120-Ω nominal resistance recommended if added No
R25 0-Ω resistor 0603 “Y” Pin Bus Connection Resistor to Output Terminal Yes
R26 Common-mode loading resistor 0603 “Y” Pin common-mode loading resistor; minimum
value is 375 Ω
No
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Table 1-3 describes the pads on the THVD24X2VEVM board where capacitors are installed by default and
where additional capacitors can be added.
Table 1-3. Capacitor Pads on the THVD24X2VEVM Board
Pad Name Function Package Comment Installed?
C1 Load capacitance for “R” 0603 N/A No
C2 47-µF, 10-V decoupling capacitor 0805 From VIO to GND on VIO supply No
C3 10-µF, 6.3-V decoupling capacitor 0805 From VIO to GND on VIO supply Yes
C4 47-µF, 10-V decoupling capacitor 0805 From VCC to GND on VCC supply No
C5 10-µF, 6.3-V decoupling capacitor 0805 From VCC to GND on VCC supply Yes
C6 100-nF, 25-V decoupling capacitor 0805 “B” line common-mode decoupling capacitor Yes
C7 100-nF, 25-V decoupling capacitor 0805 “A” line common-mode decoupling capacitor Yes
C8 47-µF, 10-V decoupling capacitor 0805 From GND to EARTH on VIO supply No
C9 10-µF, 6.3-V decoupling capacitor 0805 From GND to EARTH on VIO supply Yes
C10 47-µF, 10-V decoupling capacitor 0805 From GND to EARTH on VCC supply No
C11 10-µF, 6.3-V decoupling capacitor 0805 From GND to EARTH on VCC supply Yes
C12 Termination capacitance pad 0805 A to B capacitor pad to test different capacitive
loading conditions
No
C13 100-nF, 6.3-V decoupling capacitor 0603 U1 VCC decoupling capacitor Yes
C14 100-nF, 6.3-V decoupling capacitor 0603 U1 VIO decoupling capacitor Yes
C15 Termination capacitance pad 0805 Y to Z capacitor pad to test different capacitive
loading conditions
No
C16 100-nF, 25-V decoupling capacitor 0805 “Y” line common-mode decoupling capacitor Yes
C17 100-nF, 25-V decoupling capacitor 0805 “Z” line common-mode decoupling capacitor Yes
The THVD24X2VEVM has three LEDs preinstalled on pads D1, D2, and D3. These LEDs are in a non-standard
package. Table 1-4 provides the location and the function of each LED.
Table 1-4. LED Pads on the THVD24X2VEVM Board
Pad Name Function
D1 “R” line LED (Red)
D2 “D” line LED (Green)
D3 “VCC” LED (Blue)
Table 1-5 provides information about the device preinstalled on the EVM.
Table 1-5. Included IC for the THVD24X2VEVM
IC ID Function Package Comment Installed?
U1 THVD24X2VDR Footprint D Preinstalled with THVD2452VDR Yes
The default setup of the THVD24X2VEVM is optimized for working with the THVD2452VDRC, operating in a
single supply mode without a common-mode voltage. By shorting the headers at site J7 (VIO = VCC) and
attaching a valid power supply to VCC, the board is placed in the default state and is ready to operate.
2 Operating the EVM
2.1 Setup
The THVD24X2VEVM can operate with a either a single supply or dual supply. In single supply operation, the
logic supply is equal to the main voltage supply. In dual supply mode, the supplies for the digital logic and driver
are separate. The following sections detail the jumper configuration for each operation mode.
2.1.1 Single Supply Operation
The THVD24X2V family of transceivers in the D (SOIC) package from TI can have an additional logic supply pin,
VIO. This pin is used to power the internal digital logic circuits inside of the device. In single supply operation
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mode, for devices like the THVD2452VDR, the VIO pin can be shorted to VCC by shorting the header pins of J7,
so that the digital circuits are properly powered.
Table 2-1. Single Supply Operation Jumper Configurations
Component Name Comment
J7 Shorted for single supply operation
J1 VIO supply: leave open
J2 VCC power terminal
Apply VCC through the J2 terminal to power the EVM. With the board oriented with J6 on the top left, as shown
in Figure 2-1, the signals are, from right to left, EARTH, GND, and VCC. The EARTH and GND signal distinction
is used to help the end user to determine operational qualities with respect to ground potential differences. Install
a resistor on pad R16 for testing methods on reducing ground loop current. Check the data sheet for proper
powering considerations as supply recommendations can range from 3.3 V, 5 V, or 3.3 V to 5 V.
Providing power to the EVM is similar to the single supply option described in this section. Jumpers J1 and J2
have the same pin orientation from left to right: EARTH pin, GND pin, and voltage supply pin. Attach the VIO
power source to J1 and VCC power source to J2.
2.1.2 Dual Supply Operation
The THVD24X2V family of transceivers in the D (SOIC) package from TI can have an additional logic supply pin,
VIO. In dual supply operation, the digital circuit supply (which supplies the R, D, /RE, and DE pins) can be held
at a low voltage. This voltage typically ranges from 1.65 V to 5 V to allow interfacing with a RS-485 transceiver to
digital systems using 1.8 V logic. For dual supply operation, J7 is left open.
Table 2-2. Dual Supply Operation Jumper Configurations
Component Name Comment
J7 Leave open for dual supply operation
J1 VIO power input
J2 VCC power input
2.2 Operating the THVD24X2VEVM in Default Setup
Out-of-the-box the EVM, when powered, can operate the THVD2452V as a full duplex RS-485 transceiver. The
device pins are separated into four distinct groups: single-ended communication pins, differential communication
pins, power pins, and control pins. The preceding section Section 2.1 discusses the power pins in depth, the
other three types of pins are covered in this section.
The single-ended communication pins are connected directly through the respective jumpers to a single ended
bus. These pins are the “R” and “D” pins and represent RX and TX single-ended data, respectively. R is
referenced to J6 and D is reference to J16. J6 and J16 are the signal connection points for the EVM.
The EVM board supports two control signals: the enable pins and a slew rate control pin. The enable pins
include an active high Driver Enable (DE) pin and an active low Receiver Enable (/RE) pin. These pins are
accessed through jumpers J11 and J12, respectively. The Slew Rate Limiting pin (SLR) is a binary input that can
implement slew rate limiting to reduce emissions from the device at the cost of lower data rates. The SLR pin is
accessed through jumper J20.
The final group of signals, differential bus pins, are pins A, B, Y, and Z. The A and B pins are differential receiver
pins that are connected to terminal block J10. As is shown in Figure 2-1, with the board oriented to have J6 at
the top-left corner, the 2nd and 3rd pins of J10 are A and B, respectively. Y and Z are the differential driver pins
that are connected to terminal block J13. Using the same orientation shown in Figure 2-1, the 2nd and 3rd pins
of J13 are differential driver pins Z and Y, respectively.
Most signal inputs are use 2x4 headers. Each jumper has a specific mapping that connects the I/O, GND, VIO,
and EARTH (when present).
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Figure 2-1. Jumper Map
Table 2-3. Jumper and Pin Descriptions
Jumper Name Signal – Jumper Pin Comment
J6 R – J6 Pin 3 or 8 Receive Data – to keep constant high or low, shunt J6 I/O pins to VIO or GND
J11 /RE – J11 Pin 4 or 7 /RE – shunt J11 I/O pins to VIO or GND if only one mode is used
J12 DE – J12 Pin 3 or 8 DE – shunt J12 I/O pins to VIO or GND if only one mode is used
J16 D – J16 Pin 4 or 7 D – to keep constant high or low, shunt J16 I/O pins to VCC or GND
J20 SLR – Pin 2 or 7 Shunt I/O pin on J20 to either High (SLR active) or Low (SLR disabled)
J10 Pin 2: A; Pin 3: B Differential bus input terminal
J13 Pin 2: Z; Pin 3: Y Differential bus output terminal
J1 N/A Leave floating for single supply applications, attach digital supply if dual operation is
used
J2 N/A Attach VCC to J2
J7 N/A Shunt for single supply
Open for dual supply
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2.3 Operating the THVD24X2VEVM With Modifications
2.3.1 Single-ended Bus Modification Operational Modes
There are a few options for modifying the single ended data and control signals on this EVM. Jumpers J6, J11,
J12, and J16 all contain pads that are blank by default. For D, DE, and /RE signals there are 0603-sized pads
for either pullup or pulldown resistors to have a default logic on these pins with the added benefit of still being
able to external signals to this pin. The R pin also contains a 0603-sized pullup resistor, as is common in UART
based applications, as well as a 0603-sized pad that connects to ground for a capacitive load for testing cases
that requires capacitive loading on the R pin. A summary of possible single-ended signal pathway modifications
on the EVM are in Table 2-4.
Table 2-4. Possible Single-ended Signal Pathways
Associated Jumper or Signal Pad Name Comment
J6 / R R2 Pullup resistor pad
J6 / R C1 Capacitive load pad
J11 / /RE R6 Pullup resistor pad
J11 / /RE R5 Pulldown resistor pad
J12 / DE R8 Pullup resistor pad
J12 / DE R9 Pulldown resistor pad
J16 / D R11 Pullup resistor pad
J16 / D R12 Pulldown resistor pad
2.3.2 Differential Signal Bus Modification Operational Mode
The differential side of the RS-485 transceiver also has a few possible minor modifications that can be made
by the user. There is the option for a termination capacitor and resistor, C12 and R19 for A and B pins and
C15 and R24 for Y or Z. These capacitor and termination pads can help model termination and different loading
effects on the IC. Another common modification is applying a common-mode voltage through the common-mode
jumpers J3 through J5 (RX bus) and J17 through J19 (TX bus), which is routed to the respective bus through
common-mode resistors: R17 (A), R21 (B), R22 (Z), and R26 (Y). These resistors are not installed by default.
For full common-mode testing, resistors R17, R21, R22, and R26 can be 375 Ω, which is the standard value for
RS-485 devices.
Table 2-5. Possible Modifications for Differential Signal Bus
Associated Jumper / Signal Pad Name Comment
J3 and J5 / Common Mode on “A” R17 Common Mode Resistor to “A”
J4 and J5 / Common Mode on “B” R21 Common Mode Resistor to “B”
J17 and J18 / Common Mode on “Y” R26 Common Mode Resistor to “Y”
J17 and J19 / Common Mode on “Y” R22 Common Mode Resistor to “Z”
N/A / A and B C12 Termination Capacitor Pad (RX)
N/A / A and B R19 Termination Resistor Pad (RX)
N/A / Y and Z C15 Termination Capacitor Pad (TX)
N/A / Y and Z R24 Termination Resistor Pad (TX)
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