Requirements in NRF52840

RE: Requirements in NRF52840

Andreas — Wed, 21 Aug 2019 08:06:20 GMT

Hi,

nRF52840 (all variants): 1MB flash and 256 kB RAM
nRF52832 QFAA: 512 kB flash and 64 kB RAM
nRF52832 QFAB: 256 kB flash and 32 kB RAM

If you plan on having support for BT5 and Mesh (Bluetooth mesh is based on Bluetooth 4) you need to merge two applications, and thus more flash. nRF52832 can probably be ruled out, whether or not you will need 1MB or if 512 kB is enough you will have to see. You should get a nRF52840 DK, start developing until you get a feel of how much is needed for your application, if 512 kB is sufficient then porting the application down to nRF52832 should not be a big task.

Note that only nRF52840 supports coded-PHY, and has 8 dBm output power (nRF52832 has 4 dBm). For additional comparison see this link.

Best regards,

Andreas

RE: Requirements in NRF52840

Pavankumar K — Tue, 20 Aug 2019 18:59:12 GMT

Hi Andreas,

Thanks for the details shared.

Also please let us know the BLE SIG MESH – SDK Size of nRF52840 and nRF52832-QFAA / nRF52832-QFAB?

Thanks & Regards,

Pavankumar K

Avnet India Pvt Ltd

RE: Requirements in NRF52840

Andreas — Mon, 19 Aug 2019 07:36:44 GMT

Hi,

Criteria	Level	Comments	Yes/No

BT 5.0	Must-have		Yes
Support SIG Mesh	Must-have	Shouldnt be a custom mesh implementation	Yes
Support LE Coded Phy	Good to Have	Will help in getting long range	Yes
Long Range(Range in Meters)	Must-have		Yes, range dependent on design and environment. Typically several 100m is possible
Configurable Power (dB)	Must-have		Yes
Support for Amazon Freertos	Good to Have	If does not support get support from Amazon	Yes
Low power	Must-have		Yes
Usable ROM (128KB to 1MB)	Must-have	Should be able to handle Wifi stack	1MB flash, 256kB RAM
OTA Support(via other Interfaces)/Dual bank	Must-have	Shouls able to do DFU via UART/SPI/I2C	Yes
Certified Module (CE/FCC)	Must-have		3rd party pre-certified modules are available
Support of other Protocols	Good to Have	Gives more flexibility to use as Zigbee,NFC etc	802.15.4, NFC, ESB, Gazell and related proprietary protocols
HCI Commands	Good to Have	When used as only radio	No
Internal RTC	Must-have		Yes
Patch support	Good to Have	To get future BT spec features	If supported by the HW: yes
Debugger Support	Must-have		Yes
Voltage Level(1.8 to 3.3V)	Good to Have		Two options: 1.7V-3.6V and 2.5 V- 5.5 V
Diffferent Varients (Cortex M0/M4)	Good to Have		Cortex M4F
Work as Just Radio	Good to Have		No, but SW to have it operate as 'Just radio' is available

Best regards,

Andreas