User's Manual

GL865 Hardware User Guide

1vv0300910 Rev.1 – 2011-07-22

page 29 of 79

6.3.2. Thermal Design Guidelines

The thermal design for the power supply heat sink should be done

with the following specifications:

See para 7.2 Power Consumption

NOTE:

The average consumption during transmissions depends on the

power level at which the device is requested to transmit by the

network. The average current consumption hence varies

significantly.

Considering the very low current during idle, especially if

Power Saving function is enabled, it is possible to consider

from the thermal point of view that the device absorbs current

significantly only during calls.

For the heat generated by the GL865, you can consider it to be

during transmission 1W max during CSD/VOICE calls and 2W max

during class10 GPRS upload.

This generated heat will be mostly conducted to the ground plane

under the GL865; you must ensure that your application can

dissipate it.