Skip to main content
Jitendra J
Jitendra J
Associate
June 1, 2015
Question

BlueNRG 1.8V supply reset after every 1.5 seconds

  • June 1, 2015
  • 2 replies
  • 585 views
Posted on June 01, 2015 at 04:19

Hello,

I've designed BTLE board with BlueNRG and STM32L152. After resetting BlueNRG, voltage at pin12 (VDD1V8) is not stable. It is observed that after every around 1.5 seconds BlueNRG SMPS turns on for a while and goes off. 

Can anybody explain what is the cause of this problem? Waveform at 1.8V pin is below for reference

0690X00000602dtQAA.jpg

#jitendra
This topic has been closed for replies.

2 replies

charles23
charles23
Associate III
June 1, 2015
Posted on June 01, 2015 at 17:22

Hi Jitendra

I think you'll find this is correct operation. The Bluetooth radio is waking every 1.5s to receive/transmit, then going back to sleep. While asleep the power rails are not required and the DC-DC converter switches off.

Regards - Charles

marchese.graziella
marchese.graziella
Visitor II
June 3, 2015
Posted on June 03, 2015 at 12:55

Hi,

as Charles has said, this is a normal behaviour of BlueNRG device.

Regards,

GM

Terms & ConditionsAccessibility statement