Proc BLE powerd from CR2032

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Anonymous
Not applicable

 hi,

   

we are working on a project based on PROC BLE family + sensor for developping a BLE devices. the board will be powered from a CR2032 coin cell. the board is for IoT application where the pcb should be the smallest thing.

   

we are looking for a low cost solution and we need to know the need of a regulator  (low power dc/dc or LDO) to power the PROC chip.

   

1-  can we power the PROC+sensor directly from CR2032 ? is there any issue on battery lifetime ? do you have a design where PROC powerd directly from battery ? is there any issue about battery lifetime ?

   

2-  with coin cell, if using regulator is necessary to save battery lifetime, do you have a recommandation for PN or a design tested with batt+regulator+PROC ?

   

 

   

thanks for help.

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ETRO_SSN583
Level 9
Level 9
250 likes received 100 sign-ins 5 likes given

Ap notes below may be of help -

   

 

   

    

   

          

   

http://www.cypress.com/?id=5509 100 Projects in 100 Days with Bluetooth

   

http://www.cypress.com/?rID=102799&source=psoc4ble     FAQs

   

http://www.cypress.com/?rID=102512     AN91445 - Antenna Design Guide

   

http://www.cypress.com/?rID=102505     AN94020 - Getting Started with PRoC™ BLE

   

http://www.cypress.com/?rID=110007     AN92584 - Designing for Low Power and Estimating Battery Life for BLE Applications

   

http://www.cypress.com/?rID=109900     AN91162 - Creating a BLE Custom Profile

   

http://www.cypress.com/?rID=110107     AN91184 - PSoC 4 BLE - Designing BLE Applications

   

http://www.cypress.com/?rID=102504     AN91267 - Getting Started with PSoC® 4 BLE

   

 

   

 

   

Regards, Dana.

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Anonymous
Not applicable

 With CR2032 (3.0V), a regulator is generally not needed. As Dana pointed out before, AN92584 - Designing for Low Power and Estimating Battery Life for BLE Applications would be very helpful fro your design.

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AnWa_1259496
Level 4
Level 4
Welcome! 50 replies posted 25 replies posted

Supplementary question:

   

 

   

Its very difficult to design a casing which prevents a user from inserting a CR2032 backwards.

   

I recently looked at another manufacturers BLE solution to check what happens if the battery is inserted backwards. The result was the MCU still worked (after reversal of course!) but there was no longer any radio.

   

A simple diode in series wont work, too much voltage drop. There are other reverse-polarity solutions but has anyone tested these ICs so check whether they are damaged by short-term reverse supply?

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Anonymous
Not applicable

 If you are inserting the battery backwards, then VDDA would be grounded while VSS would be powered. This can potentially damage the device. Recommended that VDDA should be the highest voltage at any instant of time.

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