Hello,
We have a question about an application of the MSP430 (MSP430FR5969IRGZ to be specific). The application involves current handling of pins on the device while it is not powered. I know there’s a protection network internal to the pins which is rated for 2mA continuous; however, our application may result in momentarily seeing a slightly higher current (2.5mA).
The worst case conditions our application – the maximum IO input current could be and 2.5mA, we’d be interested to know that two inputs could withstand continuous drive indefinitely without any damage.
We have a few GPIO on the device which read button press inputs, and one that receives an output from a TIVA processor. The button press detection signal is HW debounced and fed through a limiting resistor to the GPIO. Worst case supply voltages and resistor values lead to the 2.5mA number I gave you. The same button press enables the MSP430’s power supply (another TI part) which comes up within a couple seconds max.
We’d like to know if someone familiar with the semiconductor design details could review the specific application (MSP430 pins and the simple network which could result in momentary bias beyond 2.0mA).
From a limited time perspective, we’d like to also confirm that several seconds (2-3seconds) would be the maximum possible time which any an input could be subject to this drive in the unpowered state. Let’s assume the maximum number here would be four inputs.
Could you confirm no damage would occur in either of the above situation?
