CC2640: Energy consumption of CC2640 in standby

If you don't connect any sensor and cc2640 is under power saving mode, it's too high. You should check if there's current leakage on your IO pins.

The standby current is listed in the data sheet and a measurement method is listed in the SWRA478 app note. At 3V with 32k xtal, you should have ~ 1.2 uA.

It's possible you have current leaking in IOs or other components on your board. I would start with measuring IOs.

You can force standby mode by commenting everything in main() except the PIN init and BIOS_start APIs.

Best wishes

Hi YiKai Chen,

Thanks a lot. How i can avoid the current leakage on IO pins?

Hello JXS,

Thanks a lot for your reply. I am also using I2C which remains enabled in Standby mode. Can you tell me how i can disable I2C in stand by mode. As it makes current to go high as 3.4 mA.

Regards

Try to set unused pins to GPI and you can use I2C_close to close I2C.

Hi YiKai Chen,

I could not find I2C_close in i2c.h. I have found I2CSlaveDisable(uint32_t ui32Base). Should i use this function to disable the I2C.

Actually i want to keep I2C disable while controller is in standby mode. When i awake the controller using wakeup line then i want I2C to work.

Regards

I check my SensorTag example and I can see function defined in I2C.h. Which BLE example do you use test?

Hi YiKai Chen,

I am using i2c as slave in cc2640. The master is STM.

I don't have experience using CC2640 I2C slave mode but I suppose you can use I2CSlaveDisable to disable I2C to see if it makes difference.