Device locked
Congratulation!
Start
Yes
Verify hardware setup:
x
Validate power supply is connected, turned on, and current limit is appropriate for the device.
x
Validate OSCin signal is supplied and turned on, if required.
x
Ensure programming cable is hooked up to the board.
x
Ensure spectrum analyzer center frequency matches target frequency. Choose wide span so that the carrier can
be seen if it is off frequency.
x
Ensure device is not powered down by the CE pin.
x
Load all registers (Ctrl+L).
Device locked
Congratulation!
No
Yes
Verify software setup:
x
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.
x
Validate that no boxes are red. If so, mouse over and read the tool tips.
x
Ensure that all the frequency boxes values are correct. Also understand that the VCO frequency could be
different than the output frequency as there are often dividers after the boxes.
x
Load all registers (Ctrl+L).
x
Try Readback at this point, if necessary.
Device locked
Congratulation!
No
Yes
Verify communications:
x
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,
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, ensure that the USB2ANY button is turned green.
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have the program blink the green LED.
x
Send simple one way communication to the device such as: POWERDOWN, RESET, or change the status of a
pin. Realize that if a RESET is done, do a Ctrl+L to refresh the registers afterwards. For POWERDOWN, you can
validate this looking at the current on the power supply.
Device locked
Congratulation!
No
Yes
No
Contact TI support
www.ti.com/support
Troubleshooting Guide
19
SNAU235 – May 2018
Copyright © 2018, Texas Instruments Incorporated
LMX2572LPEVM Evaluation Instructions
7
Troubleshooting Guide
If the EVM does not work as expected, use
to identify potential root causes. Consider the
following:
•
Do not make modifications to the EVM or change the default settings until AFTER it is verified to be
working.
•
Register readback requires the correct hardware and software setup. See
for details.
•
The POR current of the LMX2572LPEVM is approximately 30 mA.
•
The power-down current of the LMX2572LPEVM is approximately 2.5 mA.
Figure 24. Troubleshooting Guide
