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ConnectCore 6UL IMX6

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ConnectCore 6UL IMX6

‎02-05-2024 03:58 AM
1,065 Views
Deepanshu_gupta
Contributor I

Hello, 

We are using CC-WMX-JN7A-NE in a project. The board when powered off draws 1.7mA from the coin cell. The expected current the board draws in RTC mode is in uA. In the hardware reference guide, the power consumption in RTC mode is 7.5uW. 

We want to increase the life of coin cell (3V) by reducing the current drawn in the RTC mode. Can you suggest how we can increase the life of coin cell.

Also, attached the reference schematic image.

Deepanshu_gupta_0-1707130432534.png

 

Regards,

Deepanshu

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‎02-06-2024 07:14 AM
1,043 Views
Bio_TICFSL
NXP TechSupport
NXP TechSupport

Hello,

The Coin Cell Charge current is just 60 uA. It is applied to compensate cell self discharge. The coin cell charger may be software enabled / disabled.

Regarding the RTC battery, this is a good observation. VDD_VSNVS_IN is the input of the on-chip LDO that supplies the power to the Secure Non-Volatile Storage domain and RTC. Since the target output voltage of this LDO (that can be measured on the VDD_SNVS_CAP pin) is about 1.1V, it remains operational even if the VDD_VSNVS_IN voltage lowers to about 2.5V. However, a strict lower limit has not been qualified and the optimal range is [2.8 3.3]v.

 

Regards

 

Maybe some users have more information on behavior on the field when using certain batteries.

 

The RTC chip it’s another elegant solution

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