11uA to 30 uA low power pulses at 4ms intervals.

Question

SDK16 
 S132 
 nrf52832 
 SES / Windows 10 
 
 After much searching this site and the web in general I'm reaching out for support. 
 While in low-power mode I'm seeing a pulse between 11uA and 30 uA every 4ms. I'm pretty much down in the nA range between pulses. 
 I've verified it's not environmental as another device (legacy) appears to be clean. Hardware is identical - so I'm thinking it's in my firmware,. 
 GPIOS are turned off as is the ADC. 
 Wondering if anyone else has seen this - what peripheral on the device would operate at this interval while in low power. 
 Thanks in advance for any advice, 
 Peter

PeterInStillwater · Accepted Answer

Yes - That's how I'm triggering the 1 seconds pulse. Im sure there's room for improvement there as well. 
 This project is a port from the 51 to 52. In the 51 code there are multiple references to being able to directly control the power - for example: 
 
 NRF_UART0->POWER = 1; // Universal Asynchronous Receiver / Transmitter 0 
 NRF_SPI0->POWER = 1; // Serial Peripheral Interface (Master) 0 
 NRF_TWI0->POWER = 1; // Two Wire Interface (Master) 0 Note: will not work without enabling this 
 NRF_SPI1->POWER = 0; // Serial Peripheral Interface (Slave) 1 
 NRF_TWI1->POWER = 0; // Two Wire Interface (Slave) 1 
 NRF_SPIS1->POWER = 0; // Serial Peripheral Interface 0 
 NRF_GPIOTE->POWER = 1; // GPIO Tasks and Events 
 NRF_ADC->POWER = 0; // Analog-to-Digital Controller 
 NRF_TIMER0->POWER = 1; // Timer / Counter 0 
 NRF_TIMER1->POWER = 0; // Timer / Counter 1 
 NRF_TIMER2->POWER = 0; // Timer / Counter 2 
 NRF_RTC0->POWER = 1; // Real Time Counter 0 
 NRF_TEMP->POWER = 1; // Temperature Sensor 
 NRF_RNG->POWER = 1; // Random Number Generator 
 NRF_ECB->POWER = 1; // Crypto ECB 
 NRF_AAR->POWER = 1; // Accelerated Address Resolver 
 NRF_CCM->POWER = 1; // AES CCM Mode Encryption 
 NRF_WDT->POWER = 0; // Watchdog Timer 
 NRF_RTC1->POWER = 1; // Real Time Counter 1 
 NRF_QDEC->POWER = 0; // Rotary Quadrature Decoder 
 NRF_LPCOMP->POWER = 0; // Low Power Comparator I've not been able to find reference to equivalent functionality in SDK16. In the NRFX structures several/most of the "POWER" member. Peter

11uA to 30 uA low power pulses at 4ms intervals.

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