Part Number:MSP430G2553
Dear Sir,
We are reading one channel of analog input (4-20ma converted to 0-3V using 150Ohms burden) and displaying it on a 7 segment display.
Consider below conditions:
1)Input is on and greater than 16mA(2.25V) and the controller is not powered:
On powering on the controller, the display either gives a garbage value or becomes blank and this state remains until the controller is reset or when analog input is turned off and then controller is powered on.
2)Input is on and less than 16mA(2.25V) and the controller is not powered:
It displays values without any issues.
We tried improving grounding assuming that there is some leakage and controller is not able to power off because of analog input. We are not sure whether it is related to software or hardware. We also tried increasing value of power on capacitor. Nothing seems to have helped.
Can you please help us identify the cause and find a solution?
Thanks.