Part Number: AM3358-EP
Other Parts Discussed in Thread: AM3358
need to understand what the risks of overdriving the pin are in the short term.
We haven’t seen any failures related to this in any of the devices we are testing at the moment.
We intend to modify the design to remove the over-stress but we are unable to do that on the boards which are currently built and under-going test
The pin is question is the OSC0_IN (XTALIN
The table below is an extract from the datasheet which indicates that there is a level of overshoot tolerance.
The oscillator portion of the AM3358 is powered from 1.8V, given a max input from the above of 18.+0.3V = 2.1V
In circuit we are driving the OSC0_IN pin from a 3.3V logic device through a 22R source resistor. The output of the logic device is seen to be at approximately 2.9V and with the 2.1V maximum input at the AM3358 this implies we may be providing up to 36mA of current into that pin for ~50% of the clock period.
