BlueNRG 1.8V supply reset after every 1.5 seconds

Jitendra J · ‎2015-05-31

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

#jitendra

charles23 · ‎2015-06-01

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 · ‎2015-06-03

Posted on June 03, 2015 at 12:55

Hi,

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

Regards,

GM