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PCB Specifications for the Application Board
In order to save costs for simple applications, a cheap PCB structure can be used for the application
board of the WISMO228. A 4‐layer through‐hole type PCB structure can be used.
Note:
Due to the limited layers of 4-layer PCBs, sensitive signals like audio, SIM and clocks cannot be
protected by 2 adjacent ground layers. As a result, care must be taken during PCB layout for these
sensitive signals by avoiding coupling to noisy baseband through adjacent layers.
Environmental Specifications
The WISMO228 is compliant with the following operating classes. The table below lists the ideal
temperature range of the environment.
Conditions
Operating / Class A
Operating / Class B
Storage
Function Status Classification
Class A
The WISMO228 remains fully functional, meeting GSM performance criteria in accordance with
ETSI requirements, across the specified temperature range.
WA_DEV_W228_PTS_002
Figure 51. PCB Structure Example for the Application Board
Table 48. Operating Class Temperature Range
-20 °C to +55°C
-40 °C to +85°C
-40 °C to +85°C
Rev 001
Product Technical Specification &
Customer Design Guidelines
Temperature Range
Page 104 of 108
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