SIM5300E_Hardware_Design_V1.02
MODULE
R
4.7K
47K
VBAT
NETLIGHT
Figure 37: Reference circuit of NETLIGHT
4.14 PWM
SIM5300E provides two PWMs which can’t be used at the same time. Each PWM output frequency varies
from 400Hz to 100KHz. The AT command “AT + SPWM” is used to set the output period and duty cycle of the
PWM. For details, please refer to document [1].
4.15 I2C BUS
The SIM5300E provides an I2C interface. The pull up resistors on SDA and SCL line are already added in the
module internally.
Note: This function is not supported in the standard software. If user wants this function, please
contact SIMCom for more details.
4.16 ANTENNA INTERFACE
SIM5300E provides a RF antenna interface. The customer’s antenna should be located in the customer’s
main board and connected to module’s antenna pad through micro strip line or other type of RF trace whose
impendence must be controlled in 50Ω . To facilitate the antenna tuning and certification test, a RF
connector and an antenna matching circuit should be added. The following figure is the recommended
circuit.
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