Specifications

WM_PRJ_Q2400_PTS_001 - 003
6th November 2002
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Pin description
Signal Pin
number
I/O I/O type Description
CT103 / TX 39 I CMOS Transmit serial data
CT104 / RX 32 O 1X Receive serial data
CT105 / RTS 30 I CMOS Ready To Send
CT106 / CTS 37 O 1X Clear To Send
CT107 / DSR 36 O 1X Data Set Ready
CT108-2 / DTR 34 I CMOS Data Terminal
Ready
CT109 / DCD 51 O CMOS / 2X Data Carrier Detect
CT125 / RI 54 O CMOS / 2X Ring Indicator
CT102/GND Shielding
legs
Ground
The rising time and the falling times of the serial signals in reception (in
particular CT103) have to be less than 200ns.
The minimum width of the reception signals (mainly CT03) have to be more
than 2ms
Note
:
The WISMO Quik Q2403 Series has been designed to be operated using all the
serial signals. In particular, it is necessary to use the RTS/CTS hardware flow
control signals in order not to lose data.
2.8 SIM interface
2.8.1 General Description
5 signals exist:
•
SIMVCC: SIM power supply.
•
SIMRST: reset.
•
SIMCLK: clock.
•
SIMDATA: I/O port.
•
SIMPRES: SIM card detect.
The SIM interface controls a 3V SIM (and a 5V SIM through an external SIM
driver). This interface is fully compliant with GSM 11.11 recommendations
concerning SIM functions.
It is recommended to add Transient Voltage Suppressor diodes on the signal
connected to the SIM socket in order to prevent any ElectroStatic Discharge.
TVS diodes with low capacitance (less than 10pF) have to be connected on