Sierra Wireless WISMO218 - Manual (Page 22)

WA_DEV_W218_PTS_002 Rev 005 Page 22 of 109
Product Technical Specification &
Customer Design Guidelines
Functional Description
The global architecture of the WISMO218 is shown below:
WISMO218
ARM
core
DSP
core
Radio
GSM / GPRS
Digital Interfaces
Analog Interfaces
Memory
UART
ADCs
AUDIO
SIM
Control &
Power
Control Data Address
reset
RTC
power
supplys
PWMs
32768
kHz
GPIOs
BUZZER
SPI / I 2 C
Figure 1. Functional Architecture
RF Functionalities
The Radio Frequency (RF) range complies with the Phase II EGSM 900/DCS 1800 recommendation.
The frequency range for the transmit band and receive band are listed in the table below.
Transmit Band (Tx) Receive Band (Rx)
E-GSM 900 880 to 915 MHz 925 to 960 MHz
DCS 1800 1710 to 1785 MHz 1805 to 1880 MHz
The RF part of the WISMO218 is based on a specific dual band chip which includes:

a Digital low-IF receiver