Welcome to the online power profiler (OPP) for nRF91. Use this tool to estimate the current consumption of the nRF91 LTE modem. The OPP supports both NB-IoT (cat NB1) and LTE-M (cat M1), and several other network parameters.
When connected to an LTE network there are many parameters you are not able to control. Some parameters can be requested by the UE, but in the end it's the network that decides most of them. These parameters can have a significant impact on current consumption, and in order to get an idea of what to expect when you connect to the network in your area, you can use the OPP to match the network parameters, and then see the expected current consumption.
The OPP is based on measurements conducted on a nRF9160 DK while communicating with a CMW500 radio communication tester. It is meant for evaluation purposes only and will not give the exact numbers in every use case.
The current consumption is measured at 3.7V on VDD, and includes both the MCU and modem currents, as well as the SIM card.
The firmware used in the measurements is based on the serial LTE modem application which can be found here. The FW puts the MCU to sleep, and turns off the UART.
The hardware used is an nRF91 DK (PCA10090 v0.9.0) communicating with a CMW500 radio communication tester.
Enable power down: Depends on the SIM card specifications. Most SIM cards requires the sleep time to be above a certain value before it can be shut down completely, i.e. a minimum power down interval is specified by the SIM. This is to reduce the SIM card life time because of flash wear-out, since data to be retained has to be written to memory before power down. Newer SIM cards made for low power IoT applications support minimum power down intervals of 1 minute or less, while older SIM cards usually support intervals of 10 minutes or more. Some SIM cards can't be powered off at all
Minimum power down interval: The minimum power down interval supported by the SIM
A configuration file containing the parameters used by the CMW500 during testing is included here:
The tool does not show peak currents. The different bars in the graph show the average current within a specified event type, e.g. iDRX event. The radio RX/TX will typically give the highest peak currents, but it is only a small part of the event itself, hence the average current will be lower than the peak current.
Here is an example showing an cDRX paging event, and the corresponding result from the OPP.
Figure 1 shows a cDRX paging event. The average current, length and charge within the cursors are given in the OPP plot, as shown in figure 3. The maximum current (44,4 mA) is not included in the OPP plot.
Figure 2 shows the average current during the cDRX paging, the average current is given in the RRC connected mode table, as shown in figure 3.
Figure 1: cDRX paging event
Figure 2: cDRX average current
Figure 3: OPP showing cDRX numbers
This tool is based on a model of measured values and is not showing the actual measurement. The result is therefore an estimate of the expected value.
The measurements which the model is based upon are conducted on a nRF9160 module while communicating with a CMW500 Radio Communication Tester. This controlled test environment represents in many cases ideal conditions which may not be reproducible in a real network. It does not consider poor signal conditions which would result in different CE levels and repetitions.
Further, different networks support different parameters which can affect the current consumption. This tool does not give the opportunity to change every possible network configuration parameter, thus in some cases the modeled values will deviate from what is seen in a real network.