I'am achieving lowest power consumption in connected mode. I can't identify source of short spikes every 40Hz when mcu is in low power mode. I'am sure that it's not application interrupt (i have checked that these spikes doesn't cause mcu to wakeup), it might be (assumptions) kernel timer, ram retention, etc. Please put me on a right track.
BLE state: connected
Connection parameters: connection inverval min/max = 3.99 secs, SLAVE_LATENCY= 3. //bassically this puts mcu into low power mode most of the time.
Undefined: peripheral that causes 40Hz current spikes (3div spike corresponds to ~1.5mA)
Basically i'am using PCA10040 DK with ble_app_hts (sdk 12.3) modified example.
Modifications to ble_app_hts example:
disabled - application_timers_start, buttons_leds_init //turned off LED and thermometer simulation
#define MIN_CONN_INTERVAL MSEC_TO_UNITS(3990, UNIT_1_25_MS) // made maximum
#define MAX_CONN_INTERVAL MSEC_TO_UNITS(3990, UNIT_1_25_MS) //made maximum
#define CONN_SUP_TIMEOUT MSEC_TO_UNITS(32000, UNIT_10_MS) // adequete to MIN_CONN_INTERVAL
#define SLAVE_LATENCY 3
