OpenThread memory requirements

This page provides information about the layout and the amount of flash memory and RAM that is required by samples that use 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	432	0	32	560	88	0	168
CLI	ftd	414	0	32	578	87	0	169
CLI	mtd	362	0	32	630	79	0	177

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	432	65	32	495	88	11	157
CLI	ftd	414	64	32	514	87	12	157
CLI	mtd	362	65	32	565	79	12	165

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	397	0	24	91	84	0	44
CLI	ftd	378	0	24	110	83	0	45
CLI	mtd	327	0	24	161	75	0	53

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	397	65	24	26	84	11	33
CLI	ftd	378	65	24	45	83	11	34
CLI	mtd	327	64	24	97	75	11	42

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	298	0	24	702	84	0	428
CLI	ftd	279	0	24	721	83	0	429
CLI	mtd	243	0	24	757	75	0	437

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	298	22	24	680	84	7	421
CLI	ftd	279	22	24	699	83	7	422
CLI	mtd	243	22	24	735	75	7	430