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	323	0	32	669	78	0	178
CLI	ftd	304	0	32	688	77	0	179
CLI	mtd	270	0	32	722	69	0	187

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	323	65	32	604	78	11	167
CLI	ftd	304	66	32	622	77	11	168
CLI	mtd	270	65	32	657	69	11	176

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	287	0	24	201	73	0	55
CLI	ftd	269	0	24	219	72	0	56
CLI	mtd	234	0	24	254	64	0	64

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	287	65	24	136	73	12	43
CLI	ftd	269	65	24	154	72	12	44
CLI	mtd	234	65	24	189	64	12	52

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	292	0	24	708	86	0	426
CLI	ftd	273	0	24	727	85	0	427
CLI	mtd	239	0	24	761	77	0	435

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	292	22	24	686	86	6	420
CLI	ftd	273	22	24	705	85	6	421
CLI	mtd	239	22	24	739	77	6	429