hi,
i am using nrf connect extension in vs code with Zephyr os version v3.2.99-ncs2 ,
when device in system on sleep how much current consume by nrf52833 development kit ? when only RTC Being on.
1. during sleep, RTC current consumption?
2. what is complete current consumption flow(rtc,idle thread and LFRC) during system on sleep?
pm_state_force(0u, &(struct pm_state_info){PM_STATE_SUSPEND_TO_IDLE, 0, 0}); //nrfonly switch
Hello,
For information about the power consumption in these different scenarios please take a look at the Electrical Specification in the Product Specification.
Best regards,
Karl
hi,
i have read the electrical specification. i want to know during system in sleep. in which nrf52833 dk consume only 2.2 uA. so which peripheral are on in the sleep. rtc+lfrtc+ram retention = 2.2uA?? or how can i lower the current consumption in sleep. less than 2uA like 1.6uA something?
Hello,
starkAbhi said:i want to know during system in sleep. in which nrf52833 dk consume only 2.2 uA. so which peripheral are on in the sleep. rtc+lfrtc+ram retention = 2.2uA??
I would also like to emphasize that this is the electrical specification for the nRF52833 SoC, not the nRF52833 DK - i.e if you mention the consumption of the DK it might differ from these numbers since the DK has extra peripherals and circuitry that might increase consumption.
If you intend to measure this on the DK you should flip the switch to 'nRF Only' mode, so that only the SoC is powered.
starkAbhi said:how can i lower the current consumption in sleep. less than 2uA like 1.6uA something?
ION_RAMOFF_RTC mode has a power consumption of 1.5 µA, could this be what you are looking for?
Best regards,
Karl
Hello,
starkAbhi said:i want to know during system in sleep. in which nrf52833 dk consume only 2.2 uA. so which peripheral are on in the sleep. rtc+lfrtc+ram retention = 2.2uA??
I would also like to emphasize that this is the electrical specification for the nRF52833 SoC, not the nRF52833 DK - i.e if you mention the consumption of the DK it might differ from these numbers since the DK has extra peripherals and circuitry that might increase consumption.
If you intend to measure this on the DK you should flip the switch to 'nRF Only' mode, so that only the SoC is powered.
starkAbhi said:how can i lower the current consumption in sleep. less than 2uA like 1.6uA something?
ION_RAMOFF_RTC mode has a power consumption of 1.5 µA, could this be what you are looking for?
Best regards,
Karl
hello,
Online Karl Ylvisaker said:
I would also like to emphasize that this is the electrical specification for the nRF52833 SoC, not the nRF52833 DK - i.e if you mention the consumption of the DK it might differ from these numbers since the DK has extra peripherals and circuitry that might increase consumption.
yes , i measure the current consumption by flipping the switch on Nrf Only.
Online Karl Ylvisaker said:
ION_RAMOFF_RTC mode has a power consumption of 1.5 µA, could this be what you are looking for?
yes, my requirement of project is to advertise data and sleep periodically so that device consume less amount of current from small battery. it increase the battery life up to 5 years. that would be nice to have example code on how to put nrf52833 on sleep system on /no-ram retention.
Hello,
starkAbhi said:yes , i measure the current consumption by flipping the switch on Nrf Only.
Thank you for clarifying.
starkAbhi said:yes, my requirement of project is to advertise data and sleep periodically so that device consume less amount of current from small battery.
Is there an option for the device to be in SYSTEM_OFF sleep for any of this duration? Will the device be receiving an external interrupt at any point that could have been used to wake the device from SYSTEM_OFF sleep, for instance?
starkAbhi said:that would be nice to have example code on how to put nrf52833 on sleep system on /no-ram retention.
This will depend on what other peripherals and processes you have got going in your application - you will need to disable all peripherals(except the RTC) and radio activity, and then lastly turn off the ram as well.
You can read about how to configure the RAM retention during SYSTEM_ON and SYSTEM_OFF here.
Best regards,
Karl
hi,
Is there an option for the device to be in SYSTEM_OFF sleep for any of this duration? Will the device be receiving an external interrupt at any point that could have been used to wake the device from SYSTEM_OFF sleep, for instance?
System off sleep is not possible because device is independent . only software based interrupt can be feasible.
This will depend on what other peripherals and processes you have got going in your application - you will need to disable all peripherals(except the RTC) and radio activity, and then lastly turn off the ram as well.
You can read about how to configure the RAM retention during SYSTEM_ON and SYSTEM_OFF here.
system on + rtc+ lfrc + no ram retention only. ble gets on advertise-sleep-repeat. now could you provide any example code to achieve this?
Hello again,
starkAbhi said:System off sleep is not possible because device is independent . only software based interrupt can be feasible.
Thank you for clarifying.
starkAbhi said:system on + rtc+ lfrc + no ram retention only. ble gets on advertise-sleep-repeat. now could you provide any example code to achieve this?
We do unfortunately not have any examples that match this description already, but it should not take you so long to set this up yourself. I would suggest that you start out with one of the minimal BLE example, such as the Multiple Advertising Sets sample, trim away the extra advertising sets, and implement the go-to-sleep and wake-from-sleep procedures (turning off/on peripherals and RAM, etc.).
Give this a try, and let me know if you encounter any issues or questions along the way :)
If you are not yet familiar with the nRF Connect SDK then I would highly recommend taking a look through the DevAcademy Fundementals course to quickly familiarize with the SDK.
Best regards,
Karl
hi,
We do unfortunately not have any examples that match this description already, but it should not take you so long to set this up yourself. I would suggest that you start out with one of the minimal BLE example, such as the Multiple Advertising Sets sample, trim away the extra advertising sets, and implement the go-to-sleep and wake-from-sleep procedures (turning off/on peripherals and RAM, etc.).
i have some experience with nrf connect vscode sdk. i need only some guidance on API to put device in sleep to minimize sleep current near to 1.6uA or less.
below code i used to advertise-sleep-periodically.
//advertiser sleep
#include <zephyr/types.h>
#include <stddef.h>
#include <zephyr/sys/util.h>
#include <zephyr/bluetooth/bluetooth.h>
#include <zephyr/bluetooth/hci.h>
//---power management lib--
#include <zephyr/pm/pm.h>
#include <zephyr/pm/device.h>
/////////////////////////////
#define DEVICE_NAME CONFIG_BT_DEVICE_NAME
#define DEVICE_NAME_LEN (sizeof(DEVICE_NAME) - 1)
uint8_t vol_Per = 0; //voltage in % but hex converter it
static uint8_t adv_data[] = {
0x0f,0x18, //uuid battery service uuid[1],uuid[0] //0x180f: battery services
0x10 //data: battery percentage hex to % 0x10 = 16%
};
static const struct bt_data ad[] = {
BT_DATA_BYTES(BT_DATA_FLAGS, BT_LE_AD_NO_BREDR),
BT_DATA(BT_DATA_SVC_DATA16,adv_data,3),
};
/* Set Name adv data */
static const struct bt_data sd[] = {
BT_DATA(BT_DATA_NAME_COMPLETE, DEVICE_NAME, DEVICE_NAME_LEN),
};
static void bt_ready(int err) {
char addr_s[BT_ADDR_LE_STR_LEN];
bt_addr_le_t addr = {0};
size_t count = 1;
/* Start advertising */
bt_le_adv_start(BT_LE_ADV_NCONN_IDENTITY, ad, ARRAY_SIZE(ad), sd, ARRAY_SIZE(sd));
bt_id_get(&addr, &count);
bt_addr_le_to_str(&addr, addr_s, sizeof(addr_s));
// printk("Beacon started, advertising as %s\n", addr_s);
}
void main(void) {
/* Initialize the Bluetooth Subsystem */
bt_enable(NULL);
while(1) {
bt_ready(0); //advertising
/* Update advertising */
//// -------simulating voltage increasing gradually-----------
// vol_Per++;
// adv_data[2] = vol_Per;
// if (vol_Per > 64) {
// vol_Per = 0;
// }
// k_sleep(K_SECONDS(1)); //1 second
// //////////////////////////////////////////////////////
// bt_le_adv_update_data(ad, ARRAY_SIZE(ad),sd, ARRAY_SIZE(sd));
k_sleep(K_SECONDS(1)); //WAIT time
bt_le_adv_stop();
pm_state_force(0u, &(struct pm_state_info){PM_STATE_SUSPEND_TO_IDLE, 0, 0}); //nrfonly switch: 2.2 uA
k_sleep(K_SECONDS(3)); //update time
} //end of while
}//end of main
If you are not yet familiar with the nRF Connect SDK then I would highly recommend taking a look through the DevAcademy Fundementals course to quickly familiarize with the SDK.
thanks for sharing , i already have seen it.