SLLU365 January   2023 THVD1454

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2Board Description
  5. 3Board Component Overview
  6. 4Powering the Board
  7. 5Operation of THVD1454EVM
    1. 5.1 Default Operation
    2. 5.2 Potential Modifications
  8. 6Design Documents
    1. 6.1 Schematics
    2. 6.2 Layout
    3. 6.3 Bill of Materials
  9. 7References

5.1 Default Operation

After powering up the EVM with instructions listed Powering The Board, the EVM is ready to ready to operate 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.

Table 5-1 Default Pin States THVD1454
Pin on THVD1454Associated JumperDefault StateComment
RJ1Hi-Z/RE is pulled high by default leaving RX disabled
/REJ2Logic HighInternal pull-up leaves /RE ~ VCC by default. RX disabled
DEJ3Logic LowInternal pull-down leaves DE ~GND by default. TX disabled
DJ4Logic HighInternal pull-up leaves "D" high - preventing floating input on data input pin
TERMJ6Logic LowInternal pull-down disables integrated termination resistor by default
BJ7, J8, and J9Hi-ZDriver disabled by default.
AJ7, J8, and J9Hi-ZDriver Disabled by default
SLRJ6Logic LowSlew Rate Control is disabled by default allowing for maximum speeds of 20Mbps

To transmit data under the default setup see Table 5-2.

Table 5-2 TX Function Table
DE (J3)D (J4)A (Output)B (Output)
LowXHi-ZHi-Z
HighLowLowHigh
HighHighHighLow

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.

Table 5-3 RX Function Table
/RE (J2)VA - VB (J7, J8, and J9)R (J1)
HighXHi-Z
Low≥ -45 mVHigh
Low≤ -200 mVLow
Low-45 mV ≤ VA - VB ≤ -200 mVIndeterminate

For potential modifications and deviations away from default setup, please see Potential Modifications .