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5 Operation of THVD1454EVM
5.1 Default Operation
After powering up the EVM with instructions listed
without modification. If all pins, besides VCC and GND, are left floating after power up the following each pin is in
the states listed in
Table
5-1.
Pin on THVD1454
R
/RE
DE
D
TERM
B
A
SLR
To transmit data under the default setup see
DE (J3)
Low
High
High
Under the default conditions the A and B pins are unterminated and can handle data up to a speed of 20Mbps.
To receive data under the default setup see receiver function table below. For best results on reception DE
should be held low to disable the driver.
/RE (J2)
High
Low
Low
Low
For potential modifications and deviations away from default setup, please see
5.2 Potential Modifications
With a understanding of the board in its default state there are a few modifications that can be made either via
the header blocks or by adding addition components.
Figure 5-1
shows the control header J6, which with the addition of two shunts can control the Slew Rate Control
(SLR) feature and Integrated Termination (TERM) features.
SLLU365 – JANUARY 2023
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Powering The
Table 5-1. Default Pin States THVD1454
Associated Jumper
J1
J2
J3
J4
J6
J7, J8, and J9
J7, J8, and J9
J6
Table
5-2.
Table 5-2. TX Function Table
D (J4)
X
Low
High
Table 5-3. RX Function Table
V
- V
(J7, J8, and J9)
A
B
X
≥ -45 mV
≤ -200 mV
-45 mV ≤ V
- V
≤ -200 mV
A
B
Copyright © 2023 Texas Instruments Incorporated
Board, the EVM is ready to ready to operate
Default State
Hi-Z
Logic High
Logic Low
Logic High
Logic Low
Hi-Z
Hi-Z
Logic Low
A (Output)
Hi-Z
Low
High
R (J1)
Hi-Z
High
Low
Indeterminate
Potential Modifications
Operation of THVD1454EVM
Comment
/RE is pulled high by default
leaving RX disabled
Internal pull-up leaves /RE ~ VCC
by default. RX disabled
Internal pull-down leaves DE
~GND by default. TX disabled
Internal pull-up leaves "D" high -
preventing floating input on data
input pin
Internal pull-down disables
integrated termination resistor by
default
Driver disabled by default.
Driver Disabled by default
Slew Rate Control is disabled
by default allowing for maximum
speeds of 20Mbps
B (Output)
Hi-Z
High
Low
.
THVD1454EVM User's Guide
7
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