NRF51822 Lower Power Mode with RTC wakeup

[liu]

Hi,

I have a question that Product Specification v3.1 of nrf51822 describes Flexible Power Management: 2.6 μA at 3 V ON mode, all blocks IDLE. But, in the same place, NRF52832 describes as follows: 1.9 μA at 3 V in ON mode, no RAM retention, wake on RTC.

So i wonder if i cann't use RTC to wake nrf51822 in lower power mode(use power_manage()).

[Chocol8]

Hello, yes it is possibile. If you use softdevice you will have to use RTC1 instance because RTC0 is used by softdevice.

[liu]

hello, chocol8, Thanks for your reply. Now i use

err_code = app_timer_create(&m_sleep_10s_timer_id,
APP_TIMER_MODE_REPEATED, sleep_10s_timeout_handler); uint32_t err_code2 = app_timer_start(m_sleep_10s_timer_id, SLEEP_10S_TEMP_INTERVAL, NULL);

in lowe power mode with power_manage(). But the current is vary from 10uA to 70uA, now rtc can wake NRF51822 every 10s. I donn't know why the current cost is so high and vary. Thanks.