temperature rise of a circuit board using nrf51822?

[sosse]

Do I have to temperature dissipation? I attached temperature sensor on my board with nrf51822. I removed copper layer of around the temperature sensor. But it seems the temperature getting higher than normal. But I didn't do anything special in the nrf51822 except 100ms advertising temperature value. and every 1s measuring the temperature. Thank you.

[RK]

well the nrf51822 has a temperature sensor on it so you can work out from that if the chip itself is heating up. However I can't think of a case in which the chip takes anywhere near enough power to actually get warm at all, it's a low power chip. If you have a temperature rise it's far more likely to be from another component on your board (like an LDO regulator).