nRF 52840 Temp Sensor Power Consumption

[johnnyR]

Hi, 

I want to know what is the additional current or power consumption when the temp sensor is acquiring data and operating as intended.

kind regards,

Erick

[Kenneth]

Sampling the temperature takes typical 35us, the current consumption of the temperature sensor during this sampling is close to neglectable compared to the system on chip current caused by regulators and clock are kept on during sampling (e.g. ~1-2mA). I notice we haven't characterized the current consumption of the temperature sensor in the product specification, but I assume that is part of the reason. I am not sure how frequently you intend to measure the temperature, but assuming sampling temperature 1 times a second it will increase the average current consumption of 30-40nA. If you can trigger the temperature sensor while doing other CPU activity (e.g. spi, uart, or twi), then I don't expect you will be able to measure any increase since regulators and clocks are already running due to this. I guess we ideally should characterize also the current consumption of the temperature sensor, but hopefully it should give some clarity.