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 from sources.

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 plus the corresponding OPENTHREAD_NORDIC_LIBRARY and OPENTHREAD_THREAD_VERSION choices.

• 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 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 Thread 1.1 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	421	0	32	571	88	0	168
CLI	ftd	395	0	32	597	84	0	172
CLI	mtd	347	0	32	645	76	0	180

nRF52840 multiprotocol Thread 1.1 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	421	67	32	504	88	11	157
CLI	ftd	395	67	32	530	84	12	160
CLI	mtd	347	67	32	578	76	12	168

nRF52840 single protocol Thread 1.2 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	455	0	32	537	99	0	157

nRF52840 multiprotocol Thread 1.2 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	455	66	32	471	99	12	145

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 Thread 1.1 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	409	0	24	79	83	0	45
CLI	ftd	383	0	24	105	79	0	49
CLI	mtd	335	0	24	153	72	0	56

nRF52833 multiprotocol Thread 1.1 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	409	67	24	12	83	12	33
CLI	ftd	383	67	24	38	79	12	37
CLI	mtd	335	67	24	86	72	12	44

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 Thread 1.1 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	381	0	24	619	94	0	418
CLI	ftd	355	0	24	645	91	0	421
CLI	mtd	307	0	24	693	83	0	429

nRF5340 multiprotocol Thread 1.1 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	381	22	24	597	94	7	411
CLI	ftd	355	21	24	624	91	6	415
CLI	mtd	307	22	24	671	83	7	422