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MCU control of I/P and open drain O/P with a GPIO

M

mj

Jan 1, 1970
0
Diagram at the link below. EN is active high and Fault# is open drain output that goes low to indicate the fault condition. Fault# is tied to EN for auto shutdown in case of fault.

https://picasaweb.google.com/lh/photo/wppgcZSn1GViKZ_RLr9MBInBf1nAoCBqU3lrpYpqwZU?feat=directlink

I have 2 devices in parallal operation and need to report the Fault condition to the MCU and also MCU activates the devices by controlling the EN pin.

I am short of GPIOs and only one is available (can try for the 2nd if it is impossible with 1 GPIO). Is it possible with 1 GPIO to control EN of boththe devices and also read the Fault# status of both the devices? No need to identify which device was at fault. Both the devices switch ON or OFF together.

MahenK
 
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