Current consumption

As the system is constantly tuned by the PMU described in Power and clock management, estimating the current consumption of an application can be challenging if the designer cannot 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 that apply to the given scenario. The following table shows a set of common conditions used in all scenarios, unless otherwise is stated in the scenario's description. Similarly, Current consumption scenarios, common conditions for LTE modem describes the conditions used for the modem current consumption specifications. For a list of all scenarios, see 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 HFCLK=HFINT Not running

LFCLK=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
Minimum network response times
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 5
Parent topic: Power and clock management
1 Except for currents reported for a given peripheral. Peripherals' currents are estimated during momentary transmission.
2 Required UICC restart current consumption is included.
3 If the UICC used does not support supply shut down, then UICC will remain in clock stop mode. Depending on the UICC used, a clock stop current in the range of 20 μA to 60 μ[email protected] V must 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.
5 Application RAM leakage not included. Application RAM leakage quoted separately under Sleep