User's Manual

microNode Integration Specification Electrical Interface
On-Ramp Wireless, Inc. 11 014-0033-00 Rev. H
Pin # Pin Name Signal
Direction
Relative to
microNode
Signal
Type
Comment
28 UART_SOUT Output CMOS_O UART Serial output. Not
supported at this time.
29 TOUT Output CMOS_O TOUT is a normally low signal that
pulses high in response to specific
Network Timing Events
32 RF_PAEN_EXT Input CMOS_I This is used to force the PA off. It
is internally pulled low. Do not
connect at this time.
33 RF_TXENA Output CMOS_O This signal is used to indicate
status of the Power Amplifier for
the microNode: Low = OFF, High
= Enabled (Transmitting).
36 RF RF RX/TX 50 Ohm This is the RF input/output for the
microNode. It is a 50 Ohm
castellated “pin.”
39 RF_SHDN RF Shutdown CMOS_O This pin indicates the status of the
RF Transceiver for the
microNode: Low= Shutdown, High
= Active
NOTES:
1. The VDD of the internal logic of the microNode is 3.3Volt.
2. The Host is the SPI Master and the microNode is the SPI Slave.
3. OC_1
The pin-type is unique for the RESET line. Internal to the microNode, this is a simple RC
circuit that Resets to GND (0 Volts) and rises to 1.8Volts (maximum). Externally, it is required
to drive this pin via an Open Collector/Drain (States: Ground = microNode Reset, or
float = microNode Active). Most Host CPUs have programmable I/Os that allow setting as an
output (low) and as input (tri-state or float). A pull-up is not permitted. Voltages above 1.8V
can damage the Reset line of the microNode or place the microNode in a latchup state.
4. CMOS_A
a. The CMOS_A pin is used to control two Analog Regulators and their Enable pins.
b. The pin has hysteresis.
 Going High (Active): V input High is 1.2V
 Going Low (OFF): V input Low is 0.4V
c. When the microNode is ON, this pin consumes a nominal 0.2 µA but as maximum of 2
µA over the entire temperature range.