3.5.4 USIM Design Requirements
SIM circuit design shall meet EMC standards and ESD requirements, and at the same time, shall improve
anti-interference ability to ensure that the SIM can work stably. The design needs to strictly observe the
following rules:
SIM card slot is placed as close to the module as possible, away from the RF antenna, DCDC power,
clock signal cables and other strong interference sources;
Adopt the SIM card slot with metal shield shell to improve anti-interference ability;
The length of cable from the module to the SIM card slot shall not exceed 100mm. Longer cable will
reduce signal quality;
USIM_CLK and USIM_DATA signals are ground isolated to avoid mutual interference. If it is difficult
to do so, SIM signal needs to be ground protected as a set;
The filter capacitor and ESD device of SIM signal cable are placed close to the SIM card slot. Less
than 33pF capacitor for ESD device equivalent capacitor.
3.6 UART Interface
3.6.1 UART Interface Definition
L610 module has three serial ports: Main serial port, UART3 and Debug serial ports.
The L610 OPEN version can be configured with four serial ports: master serial port, UART2, UART3, and
debug serial port. UART2 electricity will spit part of the messy code, if you do not mind can be used. The
Bluetooth data of the module goes to the internal UART2.
The following describes the main features of these two serial ports:
The Main serial port and UART3 support 0,2400,4800,9600,14400,19200,28800,
33600,38400,57600,115200, 230400,460800,921600,1000000bps baud rates.
The default baud rate is 115200bps, used for data transmission and AT command transmission.
The Debug serial port supports 115200bps baud rate for FIBOCOM internal debugging.
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