User's Manual

microNode Integration Specification Power States
On-Ramp Wireless, Inc. 25 014-0033-00 Rev. H
5.1.4 Idle State
Idle state has various sub-states but generally refers to a state where the microNode is “awake”
and its system clock is on, the CPU is awake, but the RF is OFF.
5.1.5 RX State
The microNode turns on all its clocks, the main CPU and the RF in an RX-only state. The RF
transceiver, in RX state, consumes a moderate amount of power.
5.1.6 TX State
When the microNode transmits, it uses a variable transmit power that is correlated to its
received RSSI. In this state, the microNode is likely at its highest power states, but this is
somewhat dependent on RSSI. The worst case state (maximum power) is shown in Figure 15.
This is at approximately 20.8 dBm output power. This is the highest power state for the
microNode.
5.2 System
As noted, the microNode can go through various states of Deep Sleep, Idle, RX, and TX. The plot
shown in the following figure provides a representative microNode waking up and going through
these states and transitions.
All systems are different and current consumption is affected by many factors.
 Network coverage. How much TX power does a microNode need to transmit its data?
 Temperature range
 Operating Voltage
 Continuous mode vs Slotted mode: What is the Uplink Interval?
 Amount of data in the data model
 Quality of Service (QoS) for data delivery
All of the factors indicated above must be examined carefully and plotted to understand the end
result in current profiles and expected battery life projections.