TPSM8A28: VSNS- connection in single-ended sensing

George Hong

Part Number: TPSM8A28

AGND pin 14 is supposed to be NC on the board. In single-ended sensing, is VSNS- supposed to be connected to AGND pin 14 with a trace?

over 2 years ago

0 David_Daniels over 2 years ago

TI__Mastermind 20810 points

AGND pin 14 is not required to be externally connected to AGND pin 8, there is an internal connection, but you can connect to externally to pin 8 agnd.

AGND pin 14 can externally connect to VSNS-.

0 George Hong over 2 years ago in reply to David_Daniels

Prodigy 40 points

Semantics, but in single-ended sensing, VSNS- must be connected to AGND pin 14, right?

0 David_Daniels over 2 years ago in reply to George Hong

TI__Mastermind 20810 points

For single ended, VSNS- pin 13 must be connected to AGND which can be pin 8 or pin 14. VSNS- is next to AGND pin 14 which will be the simpler connection.

0 George Hong over 2 years ago in reply to David_Daniels

Prodigy 40 points

Sorry to nitpick, but there's no good way to connect VSNS- pin 13 to AGND pin 8. TI should not even suggest that as an option, with the interest of protecting AGND from noise. VSNS- pin 13 must be connected to adjacent AGND pin 14. I was simply looking for confirmation of that statement for single-ended sensing applications.

0 David_Daniels over 2 years ago in reply to George Hong

TI__Mastermind 20810 points

I understand your point

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TPSM8A28: VSNS- connection in single-ended sensing