EM1402EVM: EMB1499 VSET shorted to VIO?

Jeffrey Wright

Part Number: EM1402EVM

Hello again;

As per the EM1402 schematic, the balance current setpoint (U2.6) appears to be tied to VIO (via 0 R2 and 0 R113), but also tied to DAC_OUT (U17.1) (via 1K R82). The datasheet indicates that:

"Supported values for VSET range from 1V to 2.2V." However, VIO is 3.3V (typ)?? What is VIO when connecting to your TMS570 Launchpad??

over 6 years ago

0 Taylor Vogt over 6 years ago

TI__Genius 17370 points

Hi Jeffrey,

Good catch but the schematic is a little misleading - Vset is not actually shorted to VIO because the Vref shown on pg 8 of the schematic is a lowercase Vref which is a different net than VIO. The lowercase Vref was labeled such as a reference for the AUX connections and not the actual VREF (uppercase) pin. Apologies for the confusion.

Best Regards,

Taylor

0 Jeffrey Wright over 6 years ago in reply to Taylor Vogt

Expert 2875 points

Thanks Taylor; You're right, the label cases fooled me.
Do you have anything on the other issues I've inquired about?

Thanks!

0 Taylor Vogt over 6 years ago in reply to Jeffrey Wright

TI__Genius 17370 points

Hi Jeffrey,

Sorry for the delay, I am working on collecting data and was waiting on input from a colleague that returns to office next week. A few questions:
Have you checked that the driver on your end is working properly or tested changing the oversampling register with the GUI?
Have you tested any of the recommendations for reducing the Vsense resistance to help with adc error?
Are you facing the same checksum/invalid # of byte errors on multiple boards using the GUI(not mcu code)?

Regards,

Taylor

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EM1402EVM: EMB1499 VSET shorted to VIO?