TINA/Spice/AM4378: VDDS3P3_IOLDO connection

edward li

Part Number: AM4378
Other Parts Discussed in Thread: TPS65218

Tool/software:

From the manual and other materials, the VDDS3P3_IOLDO pin should be connected to 3.3V, but I don't know why the reference schematic is grounded.

The official information below describes VDDS3P3_IOLDO connected to 3.3V

Http://www.ti.com/lit/ug/slvuab1a/slvuab1a.pdf

Http://www.ti.com/lit/er/sprz408c/sprz408c.pdf

Http://www.ti.com/lit/ds/symlink/am4378.pdf

over 6 years ago

0 Biser Gatchev-XID over 6 years ago

TI__Guru**** 393215 points

Hi,

VDDS3P3_IOLDO is the input of an internal 1.8V LDO, and VDDA1P8_PMLDO is its output. This LDO is used when the simplified power sequencing scheme is desired, as described in www.ti.com/.../slvuab1a.pdf In the case of the AM437x GP EVM, the TPS65218 PMIC generates all the required power supplies and this LDO is not used. Therefore VDDS3P3_IOLDO is connected to GND and VDDA1P8_PMLDO is left open.

0 edward li over 6 years ago in reply to Biser Gatchev-XID

Prodigy 90 points

Thank you!

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TINA/Spice/AM4378: VDDS3P3_IOLDO connection