ZTE Corporation ZM8300G Manual Do Utilizador
ZTE ZM8300G Module Hardware User Manual
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31
3.8 USIM Interface
3.8.1
Pin Description
The baseband processor of the ZM8300G module integrates 2.85 V and 1.8 V USIM
interfaces that support automatic detection and meet requirements specified by the ETSI
and requirements specified for IMT-200 SIM cards. Figure 3-8 describes the USIM interface
signals.
Table 3-8 Description of USIM Signals
Pin
Signal
I/O
Description
Remarks
58
USIM_CLK
O
USIM clock signal
57
USIM_DATA
B
USIM data signal
The 10K resistor inside
the module is pulled up
to the USIM_PWR.
56
USIM_RESET
O
USIM reset signal
46
USIM_PWR
PO
USIM power
The module adapts to
1.8
V/2.85
V
USIM
cards.
55
USIM_DET
I
Detection of the USIM
card
hot
plugging
function
If
the
hot
plugging
function is unavailable,
leave
this
pin
not
connected.
3.8.2
Electrical Characteristics and Design Points
Instead of reserving a slot for a USIM card, the ZM8300G module connect USIM
signals using an LGA pad. During design, note that ESD circuit protection is added for all
USIM signals (do not add ESD protection circuit if eSIM is designed), and ensure that the
protection device is close to the card slot. To meet requirements of the 3GPP TS 51.010-1
protocol and EMC certification, locate the USIM card slot near the USIM signal interface of
the ZM8300G module, to prevent signal integrity from being affected due to severely
distorted waveforms that result from a long distance between the USIM card slot and the
USIM signal interface. In addition, ground the USIM_CLK and USIM_DATA signal lines.
Connect a 0.1 uF capacitor and a 33 pF capacitor in parallel between USIM_PWR and
GND, and connect capacitors in parallel between USIM_CLK/USIM_RESET/USIM_DATA