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BlueNRG 1.8V supply reset after every 1.5 seconds

Question asked by Jitendra J Employee on Jun 1, 2015
Latest reply on Jun 3, 2015 by Marchese.Graziella

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