Quectel BG96 Supplement

BG96 Mini PCIe
Hardware Design
LTE Module Series
Rev. BG96_Mini_PCIe_Hardware_Design_V1.0
Date: 2018-09-12
Status: Preliminary
www.quectel.com

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About the Document
History
Revision
Date
Author
Description
1.0
2018-09-12
Lyndon LIU/
Rex WANG/
Hyman DING
Initial

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Contents
About the Document...................................................................................................................................2
Contents.......................................................................................................................................................3
Table Index...................................................................................................................................................5
Figure Index.................................................................................................................................................6
1Introduction..........................................................................................................................................7
1.1. Safety Information......................................................................................................................8
2Product Concept..................................................................................................................................9
2.1. General Description...................................................................................................................9
2.2. Key Features ...........................................................................................................................10
2.3. Functional Diagram .................................................................................................................12
3Application Interfaces .......................................................................................................................13
3.1. Pin Assignment........................................................................................................................13
3.2. Pin Description.........................................................................................................................14
3.3. Power Supply...........................................................................................................................17
3.4. (U)SIM Interface ......................................................................................................................18
3.5. USB Interface ..........................................................................................................................20
3.6. UART Interfaces......................................................................................................................21
3.7. PCM and I2C Interfaces*.........................................................................................................21
3.8. Control and Indicator Signals..................................................................................................23
3.8.1. RI Signal.........................................................................................................................23
3.8.2. DTR Signal.....................................................................................................................23
3.8.3. W_DISABLE# Signal......................................................................................................24
3.8.4. PERST# Signal..............................................................................................................24
3.8.5. LED_WWAN# Signal .....................................................................................................25
3.8.6. WAKE# Signal................................................................................................................26
3.9. Antenna Interfaces ..................................................................................................................26
3.9.1. Antenna Requirements ..................................................................................................26
3.9.2. Recommended RF Connector for Antenna Installation.................................................27
4Electrical, Reliability and Radio Characteristics............................................................................29
4.1. General Description.................................................................................................................29
4.2. Power Supply Requirements...................................................................................................29
4.3. I/O Requirements.....................................................................................................................30
4.4. RF Characteristics...................................................................................................................30
4.5. GNSS Receiver .......................................................................................................................32
4.6. ESD Characteristics ................................................................................................................32
4.7. Current Consumption ..............................................................................................................33
5Dimensions and Packaging..............................................................................................................35
5.1. General Description.................................................................................................................35
5.2. Mechanical Dimensions of BG96 Mini PCIe ...........................................................................35

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5.3. Standard Dimensions of Mini PCI Express .............................................................................36
5.4. Packaging Specification...........................................................................................................37
6Appendix A References.....................................................................................................................38

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Table Index
TABLE 1: SUPPORTED BANDS/GNSS FUNCTIONS OF BG96 MINI PCIE..................................................... 9
TABLE 2: KEY FEATURES OF BG96 MINI PCIE............................................................................................. 10
TABLE 3: DEFINITION OF I/O PARAMETERS................................................................................................. 14
TABLE 4: DESCRIPTION OF PINS .................................................................................................................. 14
TABLE 5: DEFINITION OF VCC_3V3 AND GND PINS.................................................................................... 17
TABLE 6: PIN DEFINITION OF (U)SIM INTERFACE....................................................................................... 18
TABLE 7: PIN DEFINITION OF MAIN UART INTERFACE............................................................................... 21
TABLE 8: PIN DEFINITION OF PCM AND I2C INTERFACES......................................................................... 22
TABLE 9: PIN DEFINITION OF CONTROLAND INDICATOR SIGNALS......................................................... 23
TABLE 10: AIRPLANE MODE CONTROLLED BY HARDWARE METHOD..................................................... 24
TABLE 11: AIRPLANE MODE CONTROLLED BY SOFTWARE METHOD...................................................... 24
TABLE 12: INDICATIONS OF NETWORK STATUS (AT+QCFG="LEDMODE",0, DEFAULT SETTING)......... 25
TABLE 13: INDICATIONS OF NETWORK STATUS (AT+QCFG="LEDMODE",1) ........................................... 26
TABLE 14: ANTENNA REQUIREMENTS.......................................................................................................... 27
TABLE 15: POWER SUPPLY REQUIREMENTS.............................................................................................. 29
TABLE 16: 3.3V POWER DOMAIN OF I/O REQUIREMENTS......................................................................... 30
TABLE 17: 1.8V POWER DOMAIN OF I/O REQUIREMENTS......................................................................... 30
TABLE 18: BG96 MINI PCIE CONDUCTED RF OUTPUT POWER................................................................. 31
TABLE 19: BG96 MINI PCIE CONDUCTED RF RECEIVING SENSITIVITY ................................................... 31
TABLE 20: ESD CHARACTERISTICS OF BG96 MINI PCIE............................................................................ 32
TABLE 21: CURRENT CONSUMPTION OF BG96 MINI PCIE ........................................................................ 33
TABLE 22: GNSS CURRENT CONSUMPTION OF BG96 MINI PCIE............................................................. 34
TABLE 23: RELATED DOCUMENTS................................................................................................................ 38
TABLE 24: TERMS AND ABBREVIATIONS...................................................................................................... 38

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Figure Index
FIGURE 1: FUNCTIONAL DIAGRAM ............................................................................................................... 12
FIGURE 2: PIN ASSIGNMENT ......................................................................................................................... 13
FIGURE 3: REFERENCE DESIGN OF POWER SUPPLY ............................................................................... 17
FIGURE 4: REFERENCE CIRCUIT OF AN 8-PIN (U)SIM CARD CONNECTOR............................................ 18
FIGURE 5: REFERENCE CIRCUIT OF A 6-PIN (U)SIM CARD CONNECTOR............................................... 19
FIGURE 6: REFERENCE CIRCUIT OF USB INTERFACE .............................................................................. 20
FIGURE 7: REFERENCE CIRCUIT OF PCM APPLICATION WITH AUDIO CODEC...................................... 22
FIGURE 8: RI BEHAVIOR................................................................................................................................. 23
FIGURE 9: TIMING OF RESETTING MODULE ............................................................................................... 25
FIGURE 10: LED_WWAN# SIGNAL REFERENCE CIRCUIT DIAGRAM ........................................................ 25
FIGURE 11: WAKE# BEHAVIOR ...................................................................................................................... 26
FIGURE 12: DIMENSIONS OF THE U.FL-R-SMT CONNECTOR (UNIT: MM)................................................ 27
FIGURE 13: MECHANICALS OF U.FL-LP CONNECTORS............................................................................. 28
FIGURE 14: SPACE FACTOR OF MATED CONNECTOR (UNIT: MM) ........................................................... 28
FIGURE 15: MECHANICAL DIMENSIONS OF BG96 MINI PCIE.................................................................... 35
FIGURE 16: STANDARD DIMENSIONS OF MINI PCI EXPRESS................................................................... 36
FIGURE 17: DIMENSIONS OF THE MINI PCI EXPRESS CONNECTOR (MOLEX 679100002).................... 37

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1Introduction
This document defines BG96 Mini PCIe module, and describes its air interfaces and hardware interfaces
which are connected with customers’ applications.
This document can help customers to quickly understand module interface specifications, electrical and
mechanical details as well as other related information of BG96 Mini PCIe module. To facilitate its
application in different fields, relevant reference design is also provided for customers’ reference.
Associated with application notes and user guides, customers can use the module to design and set up
mobile applications easily.

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1.1. Safety Information
The following safety precautions must be observed during all phases of operation, such as usage, service
or repair of any cellular terminal or mobile incorporating BG96 Mini PCIe module. Manufacturers of the
cellular terminal should send the following safety information to users and operating personnel, and
incorporate these guidelines into all manuals supplied with the product. If not so, Quectel assumes no
liability for customers’ failure to comply with these precautions.
Full attention must be given to driving at all times in order to reduce the risk of an
accident. Using a mobile while driving (even with a handsfree kit) causes
distraction and can lead to an accident. Please comply with laws and regulations
restricting the use of wireless devices while driving.
Switch off the cellular terminal or mobile before boarding an aircraft. The operation
of wireless appliances in an aircraft is forbidden to prevent interference with
communication systems. If the device offers an Airplane Mode, then it should be
enabled prior to boarding an aircraft. Please consult the airline staff for more
restrictions on the use of wireless devices on boarding the aircraft.
Wireless devices may cause interference on sensitive medical equipment, so
please be aware of the restrictions on the use of wireless devices when in
hospitals, clinics or other healthcare facilities.
Cellular terminals or mobiles operating over radio signals and cellular network
cannot be guaranteed to connect in all possible conditions (for example, with
unpaid bills or with an invalid (U)SIM card). When emergent help is needed in such
conditions, please remember using emergency call. In order to make or receive a
call, the cellular terminal or mobile must be switched on in a service area with
adequate cellular signal strength.
The cellular terminal or mobile contains a transmitter and receiver.When it is ON, it
receives and transmits radio frequency signals. RF interference can occur if it is
used close to TV set, radio, computer or other electric equipment.
In locations with potentially explosive atmospheres, obey all posted signs to turn
off wireless devices such as your phone or other cellular terminals. Areas with
potentially explosive atmospheres include fuelling areas, below decks on boats,
fuel or chemical transfer or storage facilities, areas where the air contains
chemicals or particles such as grain, dust or metal powders, etc.

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2Product Concept
2.1. General Description
BG96 Mini PCIe is an embedded IoT (LTE Cat M1, LTE Cat NB1 and EGPRS) wireless communication
module. It provides data connectivity on LTE-FDD/LTE-TDD/GPRS/EGPRS networks and supports
half-duplex operation with PCI Express Mini Card 1.2 standard interface. It also provides GNSS 1) and
voice 2) functionality to meet customers’ specific application demands.
BG96 Mini PCIe module can be applied in the following fields:
Wireless POS System
Tracking System
Intelligent Meter Reading System
Security System
The following table shows the supported bands and GNSS functions of BG96 Mini PCIe module.
Table 1: Supported Bands/GNSS Functions of BG96 Mini PCIe

1. 1) GNSS function is optional.
2. 2) BG96 Mini PCIe supports VoLTE (Voice over LTE) under LTE Cat M1 network.
3. 3) BG96 GSM only supports Packet Switch.
Type
Description
LTE Cat NB1
LTE-FDD: B1/B2/B3/B4/B5/B8/B12(B17)/B13/B18/B19/B20/B26/B28
LTE Cat M1
LTE-FDD: B1/B2/B3/B4/B5/B8/B12(B17)/B13/B18/B19/B20/B26/B28
LTE-TDD: B39
GSM 3)
GSM850/GSM900/DCS1800/PCS1900
GNSS 1)
GPS, GLONASS, BeiDou/Compass, Galileo, QZSS
NOTES

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2.2. Key Features
The following table describes the detailed features of BG96 Mini PCIe module.
Table 2: Key Features of BG96 Mini PCIe
Feature
Details
Function Interface
PCI Express Mini Card 1.2 Standard Interface
Power Supply
Supply voltage: 3.0V~3.6V
Typical supply voltage: 3.3V
Transmitting Power
Class 3 (23dBm±2dB) for LTE-FDD bands
Class 3 (23dBm±2dB) for LTE-TDD bands
Class 4 (33dBm±2dB) for GSM850
Class 4 (33dBm±2dB) for GSM900
Class 1 (30dBm±2dB) for DCS1800
Class 1 (30dBm±2dB) for PCS1900
Class E2 (27dBm±3dB) for GSM850 8-PSK
Class E2 (27dBm±3dB) for GSM900 8-PSK
Class E2 (26dBm±3dB) for DCS1800 8-PSK
Class E2 (26dBm±3dB) for PCS1900 8-PSK
LTE Features
Support LTE Cat M1 and LTE Cat NB1
Support 1.4MHz RF bandwidth for LTE Cat M1
Support 200KHz RF bandwidth for LTE Cat NB1
Support SISO in DL direction
Cat M1: Max. 375Kbps (DL)/375Kbps (UL)
Cat NB1: Max. 32Kbps (DL)/70Kbps (UL)
GSM Features
GPRS:
Support GPRS multi-slot class 33 (33 by default)
Coding scheme: CS-1, CS-2, CS-3 and CS-4
Max. 107Kbps (DL), Max. 85.6Kbps (UL)
EDGE:
Support EDGE multi-slot class 33 (33 by default)
Support GMSK and 8-PSK for different MCS (Modulation and Coding
Scheme)
Downlink coding schemes: CS 1-4 and MCS 1-9
Uplink coding schemes: CS 1-4 and MCS 1-9
Max. 296Kbps (DL), Max. 236.8Kbps (UL)
Internet Protocol Features
Support PPP/TCP/UDP/SSL/TLS/FTP(S)/HTTP(S) protocols
Support PAP (Password Authentication Protocol) and CHAP (Challenge
Handshake Authentication Protocol) protocols which are usually used for
PPP connections

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1. 1) Digital audio (PCM) function is only supported in Telematics version. This function is under
development.
2. 2) USB suspend function has supported.
3. 3) Within operating temperature range, the module is 3GPP compliant.
4. 4) Within extended temperature range, the module remains the ability to establish and maintain a
voice, SMS, data transmission, emergency call, etc. There is no unrecoverable malfunction. There
are also no effects on radio spectrum and no harm to radio network. Only one or more parameters
like Pout might reduce in their value and exceed the specified tolerances. When the temperature
returns to normal operating temperature levels, the module will meet 3GPP specifications again.
5. “*” means under development.
SMS
Text and PDU mode
Point to point MO and MT
SMS cell broadcast
SMS storage: ME by default
(U)SIM Interface
Support USIM/SIM card: 1.8V, 3.0V
UART Interfaces
Baud rate can reach up to 230400bps, 115200bps by default
Used for AT command communication and data transmission
Audio Feature*
Support one digital audio interface: PCM interface 1)
USB Interface 2)
Compliant with USB 2.0 specification (slave only); the data transfer rate
can reach up to 480Mbps
Used for AT command communication, data transmission, firmware
upgrade, software debugging, GNSS NMEAoutput
USB Serial Driver: Windows 7/8/8.1/10, Windows CE 5.0/6.0/7.0*, Linux
2.6/3.x/4.1~4.14, Android 4.x/5.x/6.x/7.xLinux 2.6/3.x/4.1, Android
4.x/5.x/6.x/7.x
Antenna Interface
Include main antenna and GNSS antenna
GNSS Features
Gen8C Lite of Qualcomm
Protocol: NMEA 0183
AT Commands
Compliant with 3GPP TS 27.007, 27.005 and Quectel enhanced AT
commands
Physical Characteristics
Size: (51.0±0.15)mm ×(30.0±0.15)mm ×(4.9±0.2)mm
Weight: approx. 8.0g
Temperature Range
Operation temperature range: -35°C ~ +75°C 3)
Extended temperature range: -40°C ~ +80°C 4)
Storage temperature range: -40°C ~ +90°C
Firmware Upgrade
USB interface and DFOTA
RoHS
All hardware components are fully compliant with EU RoHS directive
NOTES

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2.3. Functional Diagram
The following figure shows the block diagram of BG96 Mini PCIe.
BG96
Module
PCM&I2C
Mini PCI Express
Interface
USB
W_DISABLE#
PERST#
LED_WWAN#
Main
Antenna
Interface
VCC
Main
Antenna
VBAT
GNSS
Antenna
Interface
GNSS
Antenna
Boost
Circuit
WAKE#
UART
DTR
RI
(U)SIM
Figure 1: Functional Diagram

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3Application Interfaces
The physical connections and signal levels of BG96 Mini PCIe comply with PCI Express Mini CEM
specifications. This chapter mainly describes the definition and application of the following interfaces of
BG96 Mini PCIe:
Power supply
(U)SIM interface
USB interface
UART interfaces
PCM and I2C interfaces
Control and indicator signals
Antenna interfaces
3.1. Pin Assignment
The following figure shows the pin assignment of BG96 Mini PCIe module. The top side contains BG96
module and antenna connectors.
PIN2
PIN52
BOT
PIN1
PIN51
TOP
PinName
PinNo.
WAKE#
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
RESERVED
RESERVED
RESERVED
GND
UART_RX
UART_TX
GND
RI
RESERVED
GND
UART_CTS
UART_RTS
GND
GND
DTR
RESERVED
GND
GND
VCC_3V3
VCC_3V3
GND
PCM_CLK
PCM_DOUT
PCM_DIN
PCM_SYNC
PinName
PinNo.
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
VCC_3V3
GND
RESERVED
USIM_VDD
USIM_DATA
USIM_CLK
USIM_RST
RESERVED
GND
W_DISABLE#
PERST#
RESERVED
GND
RESERVED
I2C_SCL
I2C_SDA
GND
USB_DM
USB_DP
GND
LED_WWAN#
USIM_PRESENCE
RESERVED
RESERVED
GND
VCC_3V3
Figure 2: Pin Assignment

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3.2. Pin Description
The following tables show the pin definition and description of BG96 Mini PCIe on the 52-pin application.
Table 3: Definition of I/O Parameters
Table 4: Description of Pins
Type
Description
IO
Bidirectional
DI
Digital Input
DO
Digital Output
OC
Open Collector
PI
Power Input
PO
Power Output
Pin No.
Mini PCI Express
Standard Name
BG96 Mini PCIe
Pin Name
I/O
Description
Comment
1
WAKE#
WAKE#
OC
Output signal to wake up
the host
Active low
2
3.3Vaux
VCC_3V3
PI
3.3V DC supply
3
COEX1
RESERVED
Reserved
4
GND
GND
Mini card ground
5
COEX2
RESERVED
Reserved
6
1.5V
RESERVED
Reserved
7
CLKREQ#
RESERVED
Reserved
8
UIM_PWR
USIM_VDD
PO
Power source for the
(U)SIM card
9
GND
GND
Mini card ground
10
UIM_DATA
USIM_DATA
IO
Data signal of (U)SIM
card
11
REFCLK-
UART_RX
DI
UART receive data
Connect to
DTE’s TX.

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12
UIM_CLK
USIM_CLK
DO
Clock signal of (U)SIM
card
13
REFCLK+
UART_TX
DO
UART transmit data
Connect to
DTE’s RX.
14
UIM_RESET
USIM_RST
DO
Reset signal of (U)SIM
card
15
GND
GND
Mini card ground
16
UIM_VPP
RESERVED
Reserved
17
RESERVED
RI
DO
Output signal to wake up
the host
Active low
18
GND
GND
Mini card ground
19
RESERVED
RESERVED
Reserved
20
W_DISABLE#
W_DISABLE#
DI
Airplane mode control
Pulled up by
default.
Active low.
21
GND
GND
Mini card ground
22
PERST#
PERST#
DI
Fundamental reset
signal
Pulled up by
default.
Active low
23
PERn0
UART_CTS
DI
UART clear to send
Connect to
DTE’s RTS.
24
3.3Vaux
RESERVED
Reserved
25
PERp0
UART_RTS
DO
UART request to send
Connect to
DTE’s CTS
26
GND
GND
Mini card ground
27
GND
GND
Mini card ground
28
1.5V
RESERVED
Reserved
29
GND
GND
Mini card ground
30
SMB_CLK
I2C_SCL
DO
I2C serial clock
Require external
pull-up to 1.8V.
31
PETn0
DTR
DI
Sleep mode control
Host must be
supported USB
Suspend
function.
32
SMB_DATA
I2C_SDA
IO
I2C serial data
Require external
pull-up to 1.8V.
33
PETp0
RESERVED
Reserved

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1. Keep all NC, reserved and unused pins unconnected.
2. 1) The digital audio (PCM) function is only supported on Telematics version. This function is under
development.
34
GND
GND
Mini card ground
35
GND
GND
Mini card ground
36
USB_D-
USB_DM
IO
USB differential data (-)
37
GND
GND
Mini card ground
38
USB_D+
USB_DP
IO
USB differential data (+)
39
3.3Vaux
VCC_3V3
PI
3.3V DC supply
40
GND
GND
Mini card ground
41
3.3Vaux
VCC_3V3
PI
3.3V DC supply
42
LED_WWAN#
LED_WWAN#
OC
LED signal for indicating
the network status of the
module
Active low
43
GND
GND
Mini card ground
44
LED_WLAN#
USIM_PRESEN
CE
DI
(U)SIM card insertion
detection
45
RESERVED
PCM_CLK1)
IO
PCM clock signal
46
LED_WPAN#
RESERVED
Reserved
47
RESERVED
PCM_DOUT1)
DO
PCM data output
48
1.5V
RESERVED
Reserved
49
RESERVED
PCM_DIN1)
DI
PCM data input
50
GND
GND
Mini card ground
51
RESERVED
PCM_SYNC1)
IO
PCM frame
synchronization
52
3.3Vaux
VCC_3V3
PI
3.3V DC supply
NOTES

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3.3. Power Supply
The following table shows pin definition of VCC_3V3 pins and ground pins.
Table 5: Definition of VCC_3V3 and GND Pins
The typical supply voltage of BG96 Mini PCIe is 3.3V. In the 2G network, the input peak current may reach
2.7A during the transmitting time. Therefore, the power supply must be able to provide enough current,
and a bypass capacitor of no less than 470µF with low ESR should be used to prevent the voltage from
dropping.
The following figure shows a reference design of power supply. The precision of resistor R2 and R3 is 1%,
and the capacitor C3 needs a low ESR.
LDO_IN
C1 C2
MIC29302WU U1
IN OUT
EN
GND
ADJ
2 4
1 3 5
VCC_3V3
100nF C3
470uF
C4
100nF
R2
82K 1%
47K 1%
R3
470uF
470R
51K R4
R1
MCU_POWER
_ON/OFF 47K
4.7K
R5
R6
C5 C6
33pF 10pF
TVS
D1
Figure 3: Reference Design of Power Supply
Pin No.
Pin Name
I/O
Power Domain
Description
2, 39, 41, 52
VCC_3V3
PI
3.0V~3.6V
3.3V DC supply
4, 9, 15, 18, 21,
26, 27, 29, 34, 35,
37, 40, 43, 50
GND
Mini card ground

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3.4. (U)SIM Interface
The (U)SIM interface circuitry meets ETSI and IMT-2000 requirements. Both 1.8V and 3.0V (U)SIM cards
are supported. The following table shows the pin definition of (U)SIM interface.
Table 6: Pin Definition of (U)SIM Interface
BG96 Mini PCIe supports (U)SIM card hot-plug via the USIM_PRESENCE pin. The function supports low
level and high level detections, and it is disabled by default. Please refer to document [2] about
AT+QSIMDET command for details.
The following figure shows a reference design for (U)SIM interface with an 8-pin (U)SIM card connector.
USIM_VDD
GND
USIM_RST
USIM_CLK
USIM_DATA
USIM_PRESENCE
100nF
GND
GND
33pF 33pF 33pF
VCC
RST
CLK IO
VPP
GND
GND
USIM_VDD
15K
(U)SIM Card Connector
Module
1.8V
51K
0R
0R
0R
Figure 4: Reference Circuit of an 8-Pin (U)SIM Card Connector
Pin No.
Pin Name
I/O
Power Domain
Description
8
USIM_VDD
PO
1.8V/3.0V
Power source for (U)SIM card
10
USIM_DATA
IO
1.8V/3.0V
Data signal of (U)SIM card
12
USIM_CLK
DO
1.8V/3.0V
Clock signal of (U)SIM card
14
USIM_RST
DO
1.8V/3.0V
Reset signal of (U)SIM card
44
USIM_PRESENCE
DI
1.8V/3.0V
(U)SIM card insertion detection

LTE Module Series
BG96 Mini PCIe Hardware Design
BG96_Mini_PCIe_Hardware_Design 19 / 40
If (U)SIM card detection function is not needed, please keep USIM_PRESENCE pin unconnected. A
reference circuit for (U)SIM interface with a 6-pin (U)SIM card connector is illustrated in the following
figure.
USIM_VDD
GND
USIM_RST
USIM_CLK
USIM_DATA 0R
0R
0R
100nF
GND
33pF 33pF 33pF
VCC
RST
CLK IO
VPP
GND
GND
15K
USIM_VDD
(U)SIM Card Connector
Module
Figure 5: Reference Circuit of a 6-Pin (U)SIM Card Connector
In order to enhance the reliability and availability of the (U)SIM card in customers’ applications, please
follow the criteria below in (U)SIM circuit design:
Keep placement of (U)SIM card connector to the module as close as possible. Keep the trace length
as less than 200mm as possible.
Keep (U)SIM card signals away from RF and power supply traces.
Assure the ground between the module and the (U)SIM card connector short and wide. Keep the
trace width of ground no less than 0.5mm to maintain the same electric potential. The decouple
capacitor between USIM_VDD and GND should be not more than 1μF and be placed close to the
(U)SIM card connector.
To avoid cross-talk between USIM_DATA and USIM_CLK, keep them away from each other and
shield them with surrounded ground.
In order to offer good ESD protection, it is recommended to add a TVS whose parasitic capacitance
should not be more than 15pF. The 0Ωresistors should be added in series between the module and
the (U)SIM card so as to facilitate debugging. The 33pF capacitors are used for filtering interference
of EGSM900. Please note that the (U)SIM peripheral circuit should be close to the (U)SIM card
connector.
The pull-up resistor on USIM_DATA line can improve anti-jamming capability when long layout trace
and sensitive occasion are applied, and should be placed close to the (U)SIM card connector.