The SRTC power consumption and a LiCELL battery life

[george]

Dear all,

We use i.MX6 with MMPF0100 for our product.

When an external power supply is not connected, it is described in the datasheet that SRTC-block current consumption is 41uA.

=> Page 30 : http://cache.freescale.com/files/32bit/doc/data_sheet/IMX6SDLCEC.pdf

For example, when we refer to SDP and use the Li-Cell battery(Panasonic : ML621 - 5mA/h) for RTC, it can keep up RTC only for 122 hours.

* 5mA / 41uA ≒ 121.9hour (≒5.08days)

If this is true, we need to change into the battery of larger capacity.

Is there any way of reducing "41uA" keeping up RTC?

Best Regards,

George

[Yuri]

  As for RTC current in SNVS Only mode, the following is footnote for the table in the Datasheet :

"The typical values shown here are for information only and are not guaranteed.

These values are average values measured on a worst-case wafer at 25 C."

So, real values may be less or greater, and - alas - we do not have app note
how to decrease consumption.

Have a great day,
Yuri

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[george]

Dear Yuri,

Thank you for the quick response.

Are "41uA" Worst-case wafer?

The datasheet of the link which I indicate is described to be typical-case wafer.

=> Page 30 : http://cache.freescale.com/files/32bit/doc/data_sheet/IMX6SDLCEC.pdf

Please let me know one.

Are 41uA the cases where X'tal is used?

Or is it the case where a ring oscillator is used?

=> Section 4.5.2 / Page 37 : http://cache.freescale.com/files/32bit/doc/data_sheet/IMX6SDLCEC.pdf

Best Regards,

George

[Yuri]

Please look at my comments below.

1.
> Are "41uA" Worst-case wafer?

41 uA is not maximum, in this sense it is not the worst case.

2.

> Are 41uA the cases where X'tal is used?

Yes.

~Yuri.