User's Manual

microNode Integration Specification Electrical Interface
On-Ramp Wireless, Inc. 14 014-0033-00 Rev. H
3.1.12 TOUT
This signal is a Time Synchronizing signal that pulses high upon specific network timing events.
3.1.13 RF_PAEN_EXT
The RF_PAEN_EXT signal is a direct hardware signal that can be used to disable the Power
Amplifier (PA) for the microNode. This signal is pulled low (100k to ground) to allow the PA to
work as normal. A microNode external device can temporarily assert this signal high to de-key
the PA for the microNode. The purpose of this direct control is to allow simple coexistence
algorithms with other RF devices. If the external device is transmitting, its transmitter signal can
disable the PA for the microNode thus avoiding a TX collision.
3.1.14 RF_TXENA
This signal is a status output of the microNode that allows other RF devices to monitor when the
microNode is transmitting. In a simple RF coexistence scheme, the RF_TXENA can disable a
coexisting radio’s transmitter, while the microNode is transmitting. The RF_TXENA signal goes
active high when transmitting.
3.1.15 RF_SHDN
This microNode output indicates status of the RF Transceiver of the microNode. If low, the
transceiver sleeps (no RX and no TX). Using RF_SHDN and RF_TXENA in combination, co-existing
RF devices can determine the absolute state of the RF Transceiver of the microNode.
3.1.16 RF
This is the RF port (TX and RX) for the microNode. It is a nominal 50 Ohm port. For best results
ensure the load termination (antenna) has a VSWR of 1.5:1 or better (return loss < -10 dB).
3.2 Environmental
3.2.1 ESD
The microNode is designed to be a truly embedded module and can almost be considered an IC.
The microNode is to be placed as a direct-connect to the Host CPU. Therefore, the microNode
has inherent minimal electrostatic discharge (ESD) protection on its I/O.
Table 6. ESD Information
ESD Model Class and Minimum Voltage
HBM Class 1C ( >1000V)
MM Class A (>100V)