Internal RTC Kw45 LOC

[chetan98]

Hello NXP,

I am using kw45 LOC with wireless uart sdk example for BLE options I did configuration by connecting J2 for power board with external coin cell after power off the board from RTC I observed RTC is retaing the time value and it works with external coin cell battery but it is consuming lot of power almost in 1 day coin cell is getting exhausted can NXP how to optimize the power of the board for long coin cell durability as my aim to use RTC it should retain value after power off from USB supply.

Thanks 

Chetan

[chetan98]

Hello 

I am using Wireless uart sdk example of kw45 Loc board and I am using external battery coin in BT2 and I tested removing coin battery and tested gave power from USB and board is working.

I am confirming in J2 I have shorted 1 and 3 as well as 2 and 4 pin.

Thankyou 

Chetan

[luis_maravilla]

Hello,

Could you help us share details about the modification implementation on J2, Could you help us confirm what did you mean by using power board in J2? And can you help us sharing a photo of your setup?

Could you help us bring details about the coin cell battery you are using, including part number and Voltage output?

In KW45B41Z-LOC Board User Manual Chapter 2.1 power supplies, indicates the options for an external battery (coin cell) in BT2 and BT1 are "CR2032 and CR2450" these 2 options are provided for more battery lifetime.

Best Regards

Luis

[luis_maravilla]

Hello Chetan,

Could you help us share details about the power board connected with external Coin cell in J2 and what voltage is using the coin cell battery?  If you could share your setup will be highly appreciated.

Could you help us confirm if you are using a coin cell battery in BT2 of KW45-LOC too? Could you help us testing using the example in the board using a coin cell battery in BT2, without the external coin cell in J2, and confirm that it is working?

BT2 is shown in Chapter 1.6.3 Figure 4 KW45B41Z-LOC Board User Manual

Did you implement software changes in the Wireless_UART example? Also, could you help us confirm which SDK version are you using?

Best Regards

Luis