Hi TI Team
I am designing a bus voltage monitor using the INA219 & the application requires that the INA219 draw very little current (<100uA). Hence I have been trying to power down the device whenever I don't need to take any measurement. Its datasheet says that it draws 20uA at idle mode but have not been able to achieve it yet. The device currently draws around 1mA.while its actively taking measurements.
Attempts to send it into power down mode by trying to write to the calibration register has been futile & even reading from the same keeps returning the same value of 0x399F irrespective of whatever I might try to write.
My queries therefore:
1. What is the appropriate method of writing to & reading from the calibration register? Why I keep getting the same value from the calibration register upon reading?
2. How to put the INA219 into power down mode? Any HW related changes required? Is there any document/guidelines for this purpose?
I am using one of the breakout boards (similar to Adafruit's) with the default device address of 0x40H.
Please advise. Eagerly awaiting reply.
Thanks