Electrical aspects common for both solutions
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4.2.2
Reset signals
4.2.2.1
Reset In
It is possible to reset the NRP H90-RE by the reset signal RST_IN. As long
as the signal RST_IN has high level, the netRAPID stays in operating
mode. High level is defined in this context as 3.3 V ± 0.3 V. The netRAPID
is in reset mode when the signal RST_IN has a static low level. To reset the
netRAPID 90, the RST_IN signal must be low (2.8 V ± 0.07 V or less) for
more than approx. 10 µs. Afterwards, the netRAPID 90 starts the
initialization and program execution. This power-up time depends
significantly on the loaded firmware.
Note:
The reset signal RST_IN is not compatible to a voltage of 5 V.
Exceeding the voltage than 3.3 V DC by more than 5 % may cause
irreversible damage to the netRAPID 90 module.
Recommendation:
We urgently recommend to add a push button to your
host system connected to the netRAPID device in order to reset the
netRAPID device. To do so, implement a reset logic in your design similar
to the one of the evaluation board NRPEB H90-RE, see the figure below:
Figure 7: Reset Logic IN
If really no possibility to reset the netRAPID module is necessary, the reset
pin (pin 35) should be permanently connected to +3.3 V in order to achieve
best EMC behavior.
netRAPID 90 | Design guide
DOC190601DG01EN | Revision 1 (Draft 10) | English | 2019-09 | Preliminary | Public
© Hilscher 2019
