What is the minimum operating temperature of nRF51802?

[Tom.Fu]

Hi Support team

1) What is the actual minimum operating temperature of nRF51802? 

2)  Could you help clarify more details about the temperature sensor(TEMP) of nRF51802 mentioned  in its data sheet? Many thanks.

[Edvin]

Hello,

Looking at the Product specification for the nRF51802:

https://docs.nordicsemi.com/bundle/nRF51-Series/resource/nRF51802_PS_v1.2.pdf

Page 34, it says that the minimum operating temperature is -40°C. If you are running in Low Voltage Mode, meaning running it at 1.8V, the minimum operating temperature is -25°C.

Regarding the temperature sensor, this is used for measuring the temperature in the chip. Typically, this is not used by the application, but by the SoftDevice (Bluetooth Low Energy stack) to decide when it needs to calibrate it's LFCLK. While the softdevice is being used (e.g. when running a Bluetooth Low Energy application) this sensor's access is very restricted, because it is reserved for the SoftDevice. 

Please note that we have a public holiday here in Norway from Tomorrow (Thursday) until Tuesday next week. Please expect some increased response time. I am sorry for the inconvenience.

Best regards,

Edvin