TPS65930 RTC

Rejo Joe Mathew

Prodigy 60 points

Other Parts Discussed in Thread: TPS65930, TPS65950

Hi There,

What is the RTC Accuracy ? . Can the TPS65930 RTC support an accuracy of ± 14 seconds per month ?

Thanks & Regards

Rejo

over 16 years ago

0 MikeW9894 over 16 years ago

Intellectual 540 points

Hi,

Have you checked out this document? http://www.ti.com/litv/pdf/swca024

It's on the TPS65950 page but I think it should also apply to the 65930 as well. I'm more of a hardware guy so I've never played with any settings but I think there are registers you use to tweak the timing to match your individual PCB layout since capacitance variations are in the nature of hardware design. I assume with these you can get your accuracy to an acceptable level but one of the TI guys would have to tell you more about how tight it is.

0 Gandhar Dighe over 16 years ago

TI__Genius 15100 points

Hi Rejo,

You can refer to the document pointed by Mike.

This document explains how 32K clk can be compensated and adjusted using TPS65930 registers. It is possible to adjust accuracy to 1/32768 seconds per hour. However, the external porocessor needs to calculate the value to be programmed in the TPS65930 registers. The value should be loaded in the COMP_REG in TPS65930.

In this case the external processor is OMAP. Can you find from OMAP support (may be Frangline) and ask how OMAP can manage this.

Regards,

Gandhar.

0 Rejo Joe Mathew over 16 years ago in reply to Gandhar Dighe

Prodigy 60 points

Hi there,

Thank you for the response, I however have one more question . Does the TPS65930 have a real time clock that is backed up by the battery connected to BKBAT? . I was able to understand from other post on this site , that there it does support Backed battery by BKBAT. and that TPS65930/20 data manual has an error. . However i would like to double check about this item

0 Rejo Joe Mathew over 16 years ago in reply to Rejo Joe Mathew

Prodigy 60 points

Hi there

I would like to Know if the power consumed by the TPS65930 in Backup mode (Only the RTC date is maintained with a couple of registers in the backup domain. No main source is connected) is limited to 7.2uW. This number is important to decide on the Backup power/Cap required for the design

Regards

Rejo

0 Kartik Sudarshana11777 over 16 years ago in reply to Rejo Joe Mathew

TI__Prodigy 630 points

Hi,

Yes. The RTC is supported when Backup battery is used on BKBAT.

Regards,

Kartik

0 Rejo Joe Mathew over 16 years ago in reply to Kartik Sudarshana11777

Prodigy 60 points

Hi there,

Can suggest the Power consumed by BKBAT during Battery backed up mode

Regards

Rejo

0 Kartik Sudarshana11777 over 16 years ago in reply to Rejo Joe Mathew

TI__Prodigy 630 points

Hi,

Yes, the typcial value of power consumption in Backup state (VBKP = 3.2V and No Main Battery connected ) is 7.2uW.

Regards,

Kartik

0 Daniel Nichols over 15 years ago in reply to Kartik Sudarshana11777

Prodigy 70 points

Hello,

Can someone please tell me the power consumption in Backup state for the TPS659-5-0? Is it the same as the TPS659-3-0?

Thanks,

Danny Nichols

0 Ankit Somani15962 over 15 years ago in reply to Daniel Nichols

Intellectual 370 points

Ya it is same.

Regards

Ankit

Power management

Power management forum

TPS65930 RTC