Potential Modifications For Single Ended Pins; Table 3-1. Jumper Configuration For Default Operation; Table 3-2. Modifications For Single Ended Pins - Texas Instruments RS485HFDPLXDRCEVM User Manual

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Jumper ID
J1
J2
J3
J4
J11
J7
J10
J5
J6
J15

3.2 Potential Modifications for Single Ended Pins

There are a few options with respect to the single ended data and control signals for modification on this EVM.
Jumpers J1 through J4 all contain pads that are blank by default. For D, DE, and RE signals there are 0603
sized pads for either pull-up or pull-down 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 pull-up resistor 0603 sized, as is common
in UART based applications, as well as a 0603 sized pad to ground for a capacitive load if testing requires
capacitive loading on the R pin. A summary of possible single ended signal pathway modifications on the EVM
are in Table 3-2.
Associated Jumper / Signal
J1 / R
J1 / R
J2 / EN1
J2 / EN1
J3 / EN2
J3 / EN2
J4 / D
J4 / D
SLLU352 – DECEMBER 2022
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Table 3-1. Jumper Configuration for Default Operation

Signal – Jumper Pin
RX –Pin 4 or 7
Enable – Pin 4 or 7
Enable – Pin 3 or 8
TX – Pin 3 or 8
SLR – Pin 2 and 7
N/A
N/A
N/A
N/A
N/A

Table 3-2. Modifications For Single Ended Pins

`Pad ID
R2
C1
R5
R6
R8
R9
R11
R12
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Operating The EVM
Comment
Receive Data – to keep always high or low
shunt J1 I/O pins to VCC or GND.
DE for VSSON and /RE for SOIC – shunt J2
I/O pins to VCC or GND if only 1 mode is to
be used.
/RE for VSSON and DE for SOIC – shunt J3
I/O pins to VCC or GND if only 1 is to be
used
Transmit Data – to keep always high or low
shunt J4 I/O pins to VCC or GND
Shunt I/O pin on J11 to either High or Low on
VSSON packages with SLR – if not included
Ground This Pin.
Shunt for Terminated Bus
Open for Unterminated Bus
Differential Bus Output Terminal.
Leave Floating for single supply applications,
attach digital supply if dual operation is used.
Attach VCC to J6
Shunt for Single Supply
Open for Dual Supply
Comment
Pull Up Resistor Pad
Capacitive Load Pad
Pull Up Resistor Pad
Pull Down Resistor Pad
Pull Up Resistor Pad
Pull Down Resistor Pad
Pull Up Resistor Pad
Pull Down Resistor Pad
RS485HFDPLXDRCEVM User Guide 9