Current consumption

As the system is being constantly tuned by the PMU described in Functional description, estimating the current consumption of an application can be challenging if the designer is not able to perform measurements directly on the hardware. To facilitate the estimation process, a set of current consumption scenarios are provided to show the typical current drawn from the VDD supply.

Each scenario specifies a set of operations and conditions applying to the given scenario. Current consumption scenarios, common conditions shows a set of common conditions used in all scenarios, unless otherwise is stated in the description of a given scenario. Similarly, Current consumption scenarios, common conditions for LTE modem describes the conditions used for the modem current consumption specifications. All scenarios are listed in Electrical specification

Peripherals typically share one or more power sources. This results in a current consumption that does not scale linearly with the number of peripherals enabled. For example, the current consumption for an application with two peripherals enabled, is not the sum of the currents reported by their individual peripherals.

Table 1. Current consumption scenarios, common conditions
Condition Value
Supply 3.7 V
Temperature 25 °C
CPU WFI (wait for interrupt)/WFE (wait for event) sleep
Peripherals All idle1
Clock Not running
RAM No retention
Cache enabled Yes
Table 2. Current consumption scenarios, common conditions for LTE modem
Condition
Cat-M1 and Cat-NB1 HD FDD mode
Good channel, RF cable, no errors in DL/UL communication
Network response times at minimum
Output power at antenna port, single-ended 50 Ω
Modem eDRX current consumption quoted with UICC that allows UICC supply shut down at eDRX intervals. 2 3 4
Modem PSM TAU event energy is measured from the modem PSM wake-up until end of RX inactivity time
All LTE modem current consumption numbers include application core idle mode consumption
1 Except for currents reported for a given peripheral. Peripheral's currents are estimated during momentary transmission.
2 Required UICC restart current consumption is included.
3 If the used UICC does not support supply shut down, then UICC will remain in clock stop mode. Depending on the used UICC a clock stop current of typ. 20-60uA@3.7V needs to be added to get the total average consumption.
4 Minimum UICC supply shut down interval and clock stop mode current consumption must be obtained from the UICC supplier.