User's Manual

3. Placement
Please pay attention to the placement and the PCB layout in your application design.
3.1. Pin Assignment
The pin assignment of the M10 module is shown in Figure 1. Placement of module should be
carefully considered to make the RF_IN pad as close as possible to antenna so as to reduce overall
RF trace length. The longer the RF trace to antenna, the larger the RF insertion loss. In addition,
please keep RF part and antenna from the system crystal and the audio part in host board as far as
possible to reduce possible RF interference due to GSM transmission bursts from antenna and RF
trace.
M10 module include the following major functional parts:
� The GSM baseband part
� Flash and SRAM
� The GSM radio frequency part
� The SMT pads interface
—LCD interface
—SIM card interface
—Audio interface
—Key-board interface
—UART interface
—Power supply
—RF interface