AM4376: VDDS3P3V_IOLDO pin connection

shigehiro tsuda

Part Number: AM4376

Hi,

In the AM437x EVM schematic, it is connected to GND via 0Ω.
But in Table 5-10.Power-Supply Decoupling Capacitor Characteristics of the AM437x datasheet, a 10nF decoupling capacitor is recommended.
Which one is correct?

Best Regards,
Shigehiro Tsuda

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

Hi,

This pin is the input of an internal 1.8V LDO, used in the AM437x simplified power solution. In this solution the LDO input VDDS3P3V_IOLDO is connected to 3.3V with 10nF decoupling, and the LDO output VDDS1P8V_IOLDO is connected to VDDS with 2.2uF decoupling.

If simplified power sequencing is not used VDDS3P3V_IOLDO should be connected to GND and VDDS1P8V_IOLDO can be left floating.

See also processors.wiki.ti.com/.../AM437x_Schematic_Checklist

0 shigehiro tsuda over 8 years ago in reply to Biser Gatchev-XID

Mastermind 9490 points

Hi Biser,

Thank you for quick reply.
I understand the connection of VDDS3P3V_IOLDO pin.

Best Regards,
Shigehiro Tsuda

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AM4376: VDDS3P3V_IOLDO pin connection