Computime Limited CT-EM2503 ユーザーズマニュアル

 

 
 

 ZigBee-Ready RF Transceiver Modules 

 

 

Computime Ltd. All rights reserved 

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Page 13 of 15   

PCB Layout Recommendations

 

 
For recommended layout pads for the module, please reference Mechanical 
Dimensions. 
 
The area underneath the module should be covered with solder resist in order to 
prevent short circuiting the test pads on the back side of the module. A solid ground 
plane is preferred. Unconnected pins should be soldered to the pads, and the pads 
should be left floating. For the module with integrated antenna, the RF pad can be 
soldered, but the pad should not be connected further. The two ground pads (pin10 
and pin12 should be grounded for all variants.) 
 
When using the onboard chip antenna, careful attention is required to the layout of the 
PCB where the module is mounted. In Figure 3 a mother PCB is shown with a 
recommended placement of the module.   
 

 

 

Figure 3 A recommended placement of the module on a mother PCB (Shaded area is ground-plane 

on mother PCB) 

 

FCC Approvals   
 

The CT-EM2503 has been designed to meet all national regulations for World-wide 
use. Using the integrated antenna it conforms to FCC CFR 47 Part 15 (USA).   
 
This device complies with Part 15 of the FCC rules. Operation is subject to the 

interference that may cause undesired operation.   
 
The device CT-EM2503 carries FCC authorization and is marked with the FCC ID 
Number. Whilst any device into which this authorized module is installed will not