Design Guide

ThingMagic Nano Carrier Board
A DIVISION OF TRIMBLE
56 Hardware Integration
CAUTION!
!
!
The RX input line and all GPIO lines configured as inputs must be low
when the module is turned off and low just before the module is turned
on. If input lines are high at the time the module is being powered up,
we have seen corruption of memory occur that cannot be remedied
except at the factory. The RX input line can be assured to be in a safe
state if it is driven by a buffer circuit that is powered by the Nano module
as shown in the Nano carrier board design. That way, the input Voltage
to the RX pin can never be higher than the DC supply voltage into the
Nano module because the buffer is powered by the Nano module.