OpenThread memory requirements

This page provides information about the layout and the amount of flash memory and RAM that is required by sample that are using the OpenThread stack. Use these values to see whether your application has enough space for running on particular platforms for different application configurations.

How to read the tables

The memory requirement tables list flash memory and RAM requirements for samples that were built using the available OpenThread pre-built libraries.

The values change depending on the sample, device type, and hardware platform. Moreover, take into account the following considerations:

• All samples were compiled using the default prj.conf, the overlay overlay-ot-defaults, and images from OpenThread pre-built libraries.

• The single protocol samples were optimized with the overlay overlay-minimal_singleprotocol.conf.

• The multiprotocol samples were optimized with the overlay overlay-minimal_multiprotocol.conf.

• To enable the multiprotocol support, the following options were used:

  • CONFIG_MPSL set to y (default setting for all samples)

  • CONFIG_BT_LL_SOFTDEVICE_DEFAULT set to y

  • CONFIG_BT set to y

  • CONFIG_BT_PERIPHERAL set to y

  • CONFIG_BT_DEVICE_NAME set to "NCS DUT"

  • CONFIG_BT_DEVICE_APPEARANCE set to 833

  • CONFIG_BT_MAX_CONN set to 1

• Values for the Thread CLI sample, which works with all OpenThread calls, are the highest possible for the OpenThread stack using the master image library configuration.

nRF52840 DK RAM and flash memory requirements

The following tables present memory requirements for samples running on the nRF52840 DK (nrf52840dk_nrf52840) with the hardware cryptography support provided by the CC310.

nRF52840 single protocol memory requirements

Sample	Variant	ROM OT stack + App [kB]	ROM Bluetooth LE stack [kB]	Persistent storage [kB]	Free ROM [kB]	RAM OT stack + App [kB]	RAM Bluetooth LE stack [kB]	Free RAM [kB]
CLI	master	314	0	32	678	73	0	183
CLI	ftd	295	0	32	697	72	0	184
CLI	mtd	261	0	32	731	64	0	192

nRF52840 multiprotocol memory requirements

Sample	Variant	ROM OT stack + App [kB]	ROM Bluetooth LE stack [kB]	Persistent storage [kB]	Free ROM [kB]	RAM OT stack + App [kB]	RAM Bluetooth LE stack [kB]	Free RAM [kB]
CLI	master	314	63	32	615	73	9	174
CLI	ftd	295	63	32	634	72	9	175
CLI	mtd	261	63	32	668	64	9	183

nRF52833 DK RAM and flash memory requirements

The following tables present memory requirements for samples running on the nRF52833 DK (nrf52833dk_nrf52833) with the software cryptography support provided by the nrf_oberon crypto library module.

nRF52833 single protocol memory requirements

Sample	Variant	ROM OT stack + App [kB]	ROM Bluetooth LE stack [kB]	Persistent storage [kB]	Free ROM [kB]	RAM OT stack + App [kB]	RAM Bluetooth LE stack [kB]	Free RAM [kB]
CLI	master	289	0	24	199	80	0	48
CLI	ftd	271	0	24	217	79	0	49
CLI	mtd	237	0	24	251	71	0	57

nRF52833 multiprotocol memory requirements

Sample	Variant	ROM OT stack + App [kB]	ROM Bluetooth LE stack [kB]	Persistent storage [kB]	Free ROM [kB]	RAM OT stack + App [kB]	RAM Bluetooth LE stack [kB]	Free RAM [kB]
CLI	master	289	64	24	135	80	9	39
CLI	ftd	271	64	24	153	79	9	40
CLI	mtd	237	63	24	188	71	9	48

nRF5340 DK RAM and flash memory requirements

The following tables present memory requirements for samples running on the nRF5340 DK (nrf5340dk_nrf5340) with the hardware cryptography support provided by the CC312.

nRF5340 single protocol memory requirements

Sample	Variant	ROM OT stack + App [kB]	ROM Bluetooth LE stack [kB]	Persistent storage [kB]	Free ROM [kB]	RAM OT stack + App [kB]	RAM Bluetooth LE stack [kB]	Free RAM [kB]
CLI	master	283	0	24	717	82	0	430
CLI	ftd	265	0	24	735	81	0	431
CLI	mtd	230	0	24	770	73	0	439

nRF5340 multiprotocol memory requirements

Sample	Variant	ROM OT stack + App [kB]	ROM Bluetooth LE stack [kB]	Persistent storage [kB]	Free ROM [kB]	RAM OT stack + App [kB]	RAM Bluetooth LE stack [kB]	Free RAM [kB]
CLI	master	283	22	24	695	82	6	424
CLI	ftd	265	21	24	714	81	6	425
CLI	mtd	230	22	24	748	73	6	433