nrf52 with LDO setup consum 10 uA

Question

I set up my nrf52 self board with internal LDO using reference schematics with internal LDO setup.

Im entering the power safe mode using __WFE instruction

if(lpm_flag)
			{
				nrf_gpio_pin_clear(LED_0);
				retry_cnt = 0;
				
				nrf_esb_disable(); // останавливаем
				while(!nrf_esb_is_idle());
				NRF_RADIO->POWER = RADIO_POWER_POWER_Disabled << RADIO_POWER_POWER_Pos;
				
				// Уходим в спящий режим если ничего не приняли	
				clocks_set(XTAL_LF, true);
				clocks_set(XTAL_HF, false);
				
				// разрешаем прерывания от кнопки и геркона
				NVIC_EnableIRQ(GPIOTE_IRQn);
								
				//NRF_POWER->TASKS_LOWPWR = 1UL;
				
//				#ifdef NRF52
//				NRF_POWER->RAM[0].POWER = RAM_RETENTION_OFF;
//				NRF_POWER->RAM[1].POWER = RAM_RETENTION_OFF;
//				NRF_POWER->RAM[2].POWER = RAM_RETENTION_OFF;
//				NRF_POWER->RAM[3].POWER = RAM_RETENTION_OFF;
//				NRF_POWER->RAM[4].POWER = RAM_RETENTION_OFF;
//				NRF_POWER->RAM[5].POWER = RAM_RETENTION_OFF;
//				NRF_POWER->RAM[6].POWER = RAM_RETENTION_OFF;
//				NRF_POWER->RAM[7].POWER = RAM_RETENTION_OFF;
//				#endif //NRF52

//				NRF_POWER->SYSTEMOFF = 0x1;
//				(void) NRF_POWER->SYSTEMOFF;
//				while (true);
				// ждем события
				
				__WFE();
				__SEV();
				__WFE();
			}

Also i did the same with nrf51 but it has DC/DC converter mode. In nrf51 case current consumtion is 1.5 - 2 uA, in nrf52 case 10 - 14 uA. Is it influence of LDO ?

Amigo · Accepted Answer

Here is board schematics overhead. My GPIO setting and clock setting functions: bool clocks_set(uint8_t source, bool state ) { NRF_CLOCK->CTIV = 16; if(source == XTAL_HF) { if(state == true) { #if defined (NRF51822) NRF_CLOCK->XTALFREQ = CLOCK_XTALFREQ_XTALFREQ_16MHz << CLOCK_XTALFREQ_XTALFREQ_Pos; #endif NRF_CLOCK->EVENTS_HFCLKSTARTED = 0; NRF_CLOCK->TASKS_HFCLKSTART = 1; while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0); } else if(state == false){ // если генератор запущен NRF_CLOCK->TASKS_HFCLKSTOP = 1; __NOP; } return (bool)(NRF_CLOCK->HFCLKSTAT >> CLOCK_HFCLKSTAT_STATE_Pos); } else if(source == XTAL_LF) { if(state == true) { // если генератор не запущен NRF_CLOCK->LFCLKSRC = CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos; NRF_CLOCK->EVENTS_LFCLKSTARTED = 0; NRF_CLOCK->TASKS_LFCLKSTART = 1; while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0); } else if(state == false){ NRF_CLOCK->TASKS_LFCLKSTOP = 1; __NOP; } return (bool)(NRF_CLOCK->LFCLKSTAT >> CLOCK_LFCLKSTAT_STATE_Pos); } } /*****************************************************************************************************/ void gpio_init( void ) { uint32_t err_code; //bsp_board_leds_init(); NVIC_DisableIRQ(GPIOTE_IRQn); NRF_GPIOTE->EVENTS_PORT = 0; #if defined (NRF51822) #elif defined (NRF52832) // Disable NFC pins NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos; NRF_UICR->NFCPINS = UICR_NFCPINS_PROTECT_Disabled << UICR_CUSTOMER_CUSTOMER_Pos; NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren<< NVMC_CONFIG_WEN_Pos; #endif // Светодиод - LED nrf_gpio_cfg_output(LED_0); // Кнопка - Button nrf_gpio_cfg_sense_input(BUTTON, GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos, NRF_GPIO_PIN_SENSE_LOW); // Геркон - Gerkon nrf_gpio_cfg_sense_input(GERKON, GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos, NRF_GPIO_PIN_SENSE_LOW); NRF_GPIOTE->INTENSET = GPIOTE_INTENSET_PORT_Enabled << GPIOTE_INTENSET_PORT_Pos; } There are no serious difference between nrf51822 and nrf52832 mcu code. But when i use nrf51 current consuption is 1.5 - 2 ua against 10 uA with nrf52. Also i noticed that in a low power mode ( __WFE(); instruction) HF generator stay active and sourced by RC gain. I thought it will inactive when LF (32768 crystal) using in LPM. I cant use power off, becouse i need gpio (gerkon) interrupt on LOW and HIGH level both (switching between low and high). I measure current consumption with my measuring tool with 0.1 uA resolution in LPM mode only. In RX & TX modes it consumes 14 - 20 mA as it is in datasheet.

Beike · Answer

I has meet the same problem, have you solved it? can anyone help me?

nrf52 with LDO setup consum 10 uA

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