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Hi andrewkim ,

Ensure the evaluation board is securely connected to the SDP board and to your PC via USB.

Verify that alljumpers are configured correctly, especially LK1, LK8, LK9, and LK10, as outlined in Table 2 of the user guide. For USB control, LK9 must be in position B. Next, confirm that the software was installed before connecting the hardware. If the board isn’t detected when you launch the program, click “Rescan” and ensure all connections are secure.

When wrting RDAC values, make sure they are within the valid range (0–1023) and that RDAC write protection is disabled in the control register. Check the power status in the software.

Lastly, use a multimeter to measure the voltage at terminal W after writing a new RDAC value. This will help determine if the issue is software or hardware-related. If the problem persists, recheck your setup, reinstall the software, and inspect the board for physical damage.

If none of these steps resolve the issue, kindly let me know.

Br,

Den

Hello dendalisay 

I have LK1 = short(jumper enable) / LK8 = A / LK9 = B / LK10 = B set.

Also, when I press PowerDown and PowerUp, the voltage value of W is displayed as 0V or 4.3V depending on the setting. The level of the VDD test point is 4.3V.

When I press BLOW FUSE, success is displayed, and when I press READ in the READ FUSE item, the data I wrote is displayed normally.

Based on this, it seems that there is no problem with the communication between the PC and the EVAL Kit.

However, when I turn off the 50-TP item and turn on RDAC and R-Performance, and then write RDAC, the voltage of W does not change.

Of course, even if I change 50-TP to On and execute write, the same phenomenon persists.

Hi andrewkim ,

Based on the details you’ve provided, it seems the issue possibly lies in the RDAC configuration rather than communication or hardware functionality. Your successful BLOW FUSE operations and accurate read-back of data confirm that the PC is communicating properly with the evaluation board.

The key focus should be on the Control Register settings when writing RDAC values. I recommend resetting these settings: disable 50-TP mode entirely, ensure R-Performance is enabled, and double-check that RDAC write protection is off.

Since the PowerDown/PowerUp function is correctly toggling the W voltage, it kinda supports tht the device is possibly operational, and the problem likely involves specific settings. Could you confirm the range of RDAC values you’re writing? Thes devices can sometimes exhibit issues with edge cases or specific transitions.

If the issue persists despite this, consider capturing a screenshot of the software interface during a write attempt. I will also try to procure an eval board and test it in the lab, but this will likely take 5-7 days.

Br,

Den

Hi andrewkim ,

Based on the details you’ve provided, it seems the issue possibly lies in the RDAC configuration rather than communication or hardware functionality. Your successful BLOW FUSE operations and accurate read-back of data confirm that the PC is communicating properly with the evaluation board.

The key focus should be on the Control Register settings when writing RDAC values. I recommend resetting these settings: disable 50-TP mode entirely, ensure R-Performance is enabled, and double-check that RDAC write protection is off.

Since the PowerDown/PowerUp function is correctly toggling the W voltage, it kinda supports tht the device is possibly operational, and the problem likely involves specific settings. Could you confirm the range of RDAC values you’re writing? Thes devices can sometimes exhibit issues with edge cases or specific transitions.

If the issue persists despite this, consider capturing a screenshot of the software interface during a write attempt. I will also try to procure an eval board and test it in the lab, but this will likely take 5-7 days.

Br,

Den

Hello dendalisay 

I set R-Performance = on / 50-TP = Off and tested both On/Off cases of RDAC.

If RDAC is OFF in the control register, the value of RDAC does not change even if the value is changed.

When RDAC is ON in the control register, the RDAC write value is set and entered in decimal, and when the input value is 9, it is displayed as 176 Ohms in the PC program.
However, you can confirm through the oscilloscope that the voltage value of W does not change.