RTC Feature Disabled of AM437x ?

shigehiro tsuda

Other Parts Discussed in Thread: AM4376, TPS65218

Hi,

By connection of am437x and TPS65218, I want to realize the following power sequences with mention to a data sheet of am4376.
Figure 5-8. Simplified Power Sequencing with RTC Feature Disabled, Dual-Voltage IOs Configured as 3.3

What kind of connection should I make in am437x and TPS65218?

Please show me the following pin processling of AM4376 when you use it in RTC function disable.
①VDDS_RTC(AD5)
②CAP_VDD_RTC(AD3)
③RTC_KALDO_EN(AE2)
④RTC_PWRONRSTn(AE6)
⑤RTC_PMIC_EN(AD6)
⑥RTC_WAKEUP(AE3)
⑦EXTINTN(G25)

Best Regards,

Shigehiro Tsuda

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Hi Tsuda-san,

Please check this wiki: http://processors.wiki.ti.com/index.php/AM437x_Schematic_Checklist#RTC

0 shigehiro tsuda over 10 years ago in reply to Biser Gatchev-XID

Mastermind 9490 points

Hi Biser-san,

Thank you for quick reply.

I checked wiki of the indication.
This is wiki of following am335x and about the same contents.
processors.wiki.ti.com/.../AM335x_Schematic_Checklist

As for 4-5 of Datasheet power up sequencing written in this wiki, datasheet of AM437x does not have a mention.
Is this correct ?
Do you not have any problem by the following processing if right?
VDDS_RTC =1.8 V power supply
CAP_VDD_RTC =VDD_CORE(1.1V)
RTC_KALDO_ENn =VDDS_RTC
RTC_PWRONRSTn =VSS
PMIC_POWER_EN =No Connect
EXT_WAKEUP =VSS
EXTINTN = 3.3V pullup

Best Regards,
Shigehiro Tsuda

0 Biser Gatchev-XID over 10 years ago in reply to shigehiro tsuda

TI__Guru**** 393215 points

Tsuda-san,

I have confirmation from the factory team that there are no differences between AM335X and AM437X for "RTC Feature Disabled" use case.

0 shigehiro tsuda over 10 years ago in reply to Biser Gatchev-XID

Mastermind 9490 points

Hi Biser-san,

Thank you for quick reply.

Thank you for the confirmation to the factory team.

When I used it in RTC disable, I was able to understand a not different thing by usage of am437x and AM335x.

Best Regards,

Shigehiro Tsuda

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RTC Feature Disabled of AM437x ?