Quectel EC21 Mini PCIe Series Hardware Design page 62

EC21 Mini PCIe
EC21 Module
PCI Express Mini Card Connector
Application Board
NOTES
1. The module offers the best performance when the internal BB chip stays below 105° C. When the
maximum temperature of the BB chip reaches or exceeds 105° C, the module works normal but
provides reduced performance (such as RF output power, data rate, etc.). When the maximum BB
chip temperature reaches or exceeds 115° C, the module will disconnect from the network, and it will
recover to network connected state after the maximum temperature falls below 115° C. Therefore, the
thermal design should be maximally optimized to make sure the maximum BB chip temperature
always maintains below 105° C. Customers can execute AT+QTEMP command and get the
maximum BB chip temperature from the first returned value.
2. For more detailed guidelines on thermal design, please refer to document [4].
EC21_Mini_PCIe_Hardware_Design
Thermal Pad
Heatsink
Shielding Cover
Figure 18: Referenced Heatsink Design
LTE Standard Module Series
EC21 Mini PCIe Hardware Design
Thermal Pad
Heatsink
Application Board
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