
PN6280_Hardware Design
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3.2.2 USIM application
USIM card signal group (PIN number: 8, 9, 10, 11), near the USIM card seat on the line. Please note
to increase the ESD protection device.
In order to meet the requirements of 3GPP TS 51.010-1 protocol and EMC certification, the proposed
USIM card is arranged near the position module USIM card interface, and avoid to layout too long
resulting in serious waveform distortion, affecting the signal integrity. USIM_CLK and USIM_DATA
signals are recommended to be protected. Between GND and USIM_VDD in parallel with a 1uF and
33pF capacitors, that can filter out the interference of radio frequency signals.
Figure 3-4 (U)SIM Circuit
3.3 USB Interface
USB application
The USB interface of the module conforms to the USB2.0 specification and electrical characteristics.
Support the low-speed, full-speed and high-speed three operating modes. The data exchange
between the main processor (AP) and the module is mainly completed through the USB interface.