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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
ControlDataAddress
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