Technical question on nrf9160 (Thingy:91 Demo)

[Martin]

The questions are related to nrf9160:

• How much memory space is currently used and free on the Thingy:91, nrf9160?
• How much memory would take a complex timing routine written by the customer, for the nrf9160.
• How much current is the nrf9160 using.              The main questions is: how long does a battery or accu last.       And which battery size is recommended for lets say  2 years of use?
• In case of a fall out of the LTE-M, NB-IoT. Will there be a fallback possible like for example to 2G?               What means the Sensor Data collection continues, nrf9160 switches to 2G, for example?

Our endcustomer is currently starting to evaluate the Thingy:91, nrf9160. Is planing to use the IC in one of their applciations.

Thank you for your Support

Martin Löwe Rutronik Germany

[Håkon Alseth]

Hi,

 

How much memory space is currently used and free on the Thingy:91, nrf9160?

 That depends on what you put into it. Its 1M flash, and 256 kB RAM, but: the secure region is 48 kB. Adding MCUboot uses an additional section of 48 kB of flash if enabled.

Since the application image is banked (if using MCUBoot), the region for your application is (1024-2*48)/2 = 464.

 

 

How much memory would take a complex timing routine written by the customer, for the nrf9160.

 I cannot answer this, unfortunately. It all depends on how much code is compiled down and how much RAM it uses. Only the customer will know this.

 

How much current is the nrf9160 using.              The main questions is: how long does a battery or accu last.       And which battery size is recommended for lets say  2 years of use?

 This depends on usage, and how often you send, and which protocol is in use, etc. CPU handling of external factors, such as sensors and buttons etc must also be factored in.

 

In case of a fall out of the LTE-M, NB-IoT. Will there be a fallback possible like for example to 2G?               What means the Sensor Data collection continues, nrf9160 switches to 2G, for example?

 2G is not supported in the nRF9160. LTE M1 or NB1 is the supported PHY.

 

Kind regards,

Håkon

[Martin]

Hello Hakon, thank you for your feedback. That means more customer details are required to give a detailed answer. A assume an example application report is not yet available to make a first jugment.

[Håkon Alseth]

Sorry for missing this. You are correct, an application report isn't available.

 

Kind regards,

Håkon