Figure 6. Tlk3134 Evm Voltage Monitor Led Disabled Example; Figure 7. Tlk3134 Evm Voltage Monitor Led Connected Directly To Plane Example - Texas Instruments TLK3134 XAUI User Manual

Figure 6. TLK3134 EVM Voltage Monitor LED Disabled Example
Placing the jumper on the DISABLE side of the Voltage Monitor Enable/Disable header
disconnects the power plane to the input of the voltage monitoring circuit and instead ties the
input to GND. This prevents the output of the Voltage Monitoring Circuit from floating and
possibly causing the LED to flicker during contact with the board.
Placing the jumper on the MONITOR side of the LED Monitor/Direct Connect selection header
connects the LED drive circuit to the output of the Voltage Monitor circuit causing the LED to be
off since the voltage monitor circuit will sense that the plane voltage is GND which is less than
the acceptable plane voltage.
Figure 7. TLK3134 EVM Voltage Monitor LED Connected Directly to Plane Example
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TLK3134 XAUI Transceiver / 4 Channel Multi-Rate Transceiver Evaluation Module (EVM) Users' Guide
SLLU104A - September 2007