[STM32WB55] power consumption about STOP2

[LucienKUANG-vip]

Describe the bug
When developing a BLE application with the STM32WB, I found that the power consumption in STOP2 low-power mode is higher than what is stated in the official documentation. In STOP2 mode, the average current is around 75 µA.
However, the official documentation STOP2 status that the average current can reach approximately 2.1 µA.

To Reproduce

1. using the demo :C:\Users\user name\zephyrproject\zephyr\samples\boards\st\power_mgmt\stm32wb_ble and using NUCLEO-WB55.
2. change the main.c

int main(void)
{
	int err;

	printk("Starting Beacon Demo\n");
	/* Initialize the Bluetooth Subsystem */
	err = bt_enable(bt_ready);
	if (err) {
		printk("Bluetooth init failed (err %d)\n", err);
	}

	/* Give time to bt_ready sequence */
	k_sleep(K_SECONDS(6));

	printk("BLE disable\n");
	err = bt_disable();
	if (err) {
		printk("Bluetooth disable failed (err %d)\n", err);
	}

	k_sleep(K_SECONDS(2));

	printk("BLE restart\n");
	/* Initialize the Bluetooth Subsystem */
	err = bt_enable(bt_ready);
	if (err) {
		printk("Bluetooth init failed (err %d)\n", err);
	}

	/* Give time to bt_ready sequence */
	k_sleep(K_SECONDS(6));

	printk("BLE disable\n");
	err = bt_disable();
	if (err) {
		printk("Bluetooth disable failed (err %d)\n", err);
	}

	//printk("Powering off\n");
	//sys_poweroff();
	while(1){
		k_sleep(K_SECONDS(2));
	}
	

	return 0;
}

3. Compile, download, and then run to observe the Realtime current.

5. When debugging the code, I found that the program does enter STOP2 mode.

6. Can you help to check why the stop2 real time power consumption is abnormal?

[FRASTM]

Hi @LucienKUANG-vip

what is the current you are measuring ?
If this is the Vdd of the whole nucleo board, all the components are sinking current ( stlink part, rf, leds etc, not only the stm2wb55 mcu.
Can you measure current on the JP3 connector ?
"remove all jumpers on connector JP5 to avoid leakages between ST-Link circuitry and STM32WB device."