YUGE CEM600 EVDO Mini User manual

Product Name
CEM600 EVDO Mini PCIE Module Hardware User Guide
Number of Pages
25
Produce Version
V1.8
Date
2012/8/12
CEM600 EVDO Mini PCIE
Module Hardware User Guide
V1.8
Shang Hai YUGE Information Technology co., LTD
All rights reserved

CEM600 EVDO Mini PCIE Module Hardware User Guide
Shang Hai YUGE Information Technology co., LTD
Page 1of 25
Update records
version
Date
Author
Description
V0.1
20101010
Initial
V0.2
20101108
Official release
V1.0
20110310
Update some interface descriptions
V1.1
20110530
Correct the error in the block diagram
V1.2
20110714
Add company information
V1.3
20110725
Modify the description of the operating temperature
V1.4
20110812
Correction section description error
V1.5
20111121
Modify the indicator status description
V1.6
20111216
Modify the UART port description
V1.7
20120505
Modify some text description errors
V1.8
20120812
Modify operating voltage and leakage current

CEM600 EVDO Mini PCIE Module Hardware User Guide
Shang Hai YUGE Information Technology co., LTD
Page 2of 25
Contents
Chapter 1. Introduction............................................................................................................... 4
1.1 Overview.......................................................................................................................4
1.2 Abbreviations................................................................................................................ 4
Chapter 2. Module review...........................................................................................................5
2.1 Product Introduction..................................................................................................... 5
2.2 Module function block diagram....................................................................................5
2.3 Main function of the module.........................................................................................6
Chapter 3. Technical specifications.............................................................................................7
3.1 Overall technical indicators...........................................................................................7
3.2 RF receiving indicators................................................................................................. 7
3.3 RF emission indicators..................................................................................................8
3.4 Power Supply DC Characteristics.................................................................................9
Chapter 4 Interface definition................................................................................................... 10
Chapter 5. Main function interface description.........................................................................12
5.1 UART interface (optional function)............................................................................ 12
5.2 USB interface.............................................................................................................. 13
5.3 PCM interface (optional feature)................................................................................ 14
5.4 AUDIO interface......................................................................................................... 15
5.5 RUIM card interface................................................................................................... 16
5.6 Control and general purpose I/O interface (optional feature)..................................... 17
5.7 Power interface............................................................................................................18
5.8 Antenna socket interface............................................................................................. 19
Chapter 6. structure................................................................................................................... 21
6.1 Structural size..............................................................................................................21
6.2 Mini PCI Express connector....................................................................................... 22
6.3 RF connector............................................................................................................... 23

CEM600 EVDO Mini PCIE Module Hardware User Guide
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Chart catalog
Figure 2-1 Functional Block Diagram of the CEM600 Module.................................................5
Figure 5-1 UART interface and microprocessor connection reference design......................... 12
Figure 5-2 Serial connection reference design..........................................................................13
Figure 5-3 USB interface signal................................................................................................13
Figure 5-4 USB interface reference design...............................................................................14
Figure 5-5 PCM digital voice application reference design......................................................15
Figure 5-6 Differential Audio Interface Reference Design.......................................................16
Figure 5-8 RUIM card interface reference design.................................................................... 17
Figure 5-9 LED lamp reference design.....................................................................................18
Figure 5-10 Antenna interface ESD protection recommended................................................. 20
Figure 6-1 Outline drawing of the CEM600 module................................................................21
Figure 6-2 CEM600 module structure size............................................................................... 22
Figure 6-3 PCI Express Mini Card Connector..........................................................................23
Figure 6-4 Antenna connector size............................................................................................23
Figure 6-5 Antenna connector mating plug...............................................................................24
Table directory
Table 3-1 Overall technical indicators........................................................................................ 7
Table 3-2 Radio Frequency Receive........................................................................................... 7
Table 3-3 RF emissions...............................................................................................................8
Table 3-4 DC characteristics of the power supply...................................................................... 9
Table 4-1 Interface definition....................................................................................................10
Table 5-1 UART Interface Definition....................................................................................... 12
Table 5-2 USB Interface Definition.......................................................................................... 13
Table 5-3 PCM Interface Definition......................................................................................... 14
Table 5-4 AUDIO Interface Definition..................................................................................... 15
Table 5-5 RUIM card interface definition.................................................................................16
Table 5-7 LED_WWAN_N Status Indicator Table................................................................... 18
Table 5-8 Power Interface Definition........................................................................................18
Table 5-9 Antenna interface characteristics.............................................................................. 19

CEM600 EVDO Mini PCIE Module Hardware User Guide
Shang Hai YUGE Information Technology co., LTD
Page 4of 25
Chapter 1. Introduction
1.1 Overview
This document describes the functions, interfaces, technical specifications, appearance,
and structure of the CEM600 module. It can help the R&D engineers using this module to
provide design references.
1.2 Abbreviations
ADC
Analog-Digital Converter
模数转换
AFC
Automatic Frequency Control
自动频率控制
AGC
Automatic Gain Control
自动增益控制
ARFCN
Absolute Radio Frequency Channel Number
绝对射频信道号
B2B
Board to Board Connector
板对板连接器
BER
Bit Error Rate
比特误码率
CDMA
Code Division Multiple Access
码分多址
DAI
Digital Audio interface
数字音频接口
DAC
Digital-to-Analog Converter
数模转换
DSP
Digital Signal Processor
数字信号处理
DTR
Data Terminal Ready
数据终端准备好
EFR
Enhanced Full Rate
增强型全速率
EMC
Electromagnetic Compatibility
电磁兼容
EMI
Electro Magnetic Interference
电磁干扰
ESD
Electronic Static Discharge
静电放电
EVDO
Evolution Data Only
演进数据优化或者进化的数
据
FR
Full Rate
全速率
GPRS
General Packet Radio Service
通用分组无线业务
HR
Half Rate
半速率
IMEI
International Mobile Equipment Identity
国际移动设备标识
ISO
International Standards Organization
国际标准化组织
PLL
Phase Locked Loop
锁相环
PPP
Point-to-point protocol
点到点协议
RAM
Random Access Memory
随机访问存储器
ROM
Read-only Memory
只读存储器
RTC
Real Time Clock
实时时钟
SMS
Short Message Service
短消息服务
UART
Universal asynchronous receiver-transmitter
通用异步接收/发送器
UIM
User Identifier Management
用户身份管理
USB
Universal Serial Bus
通用串行总线
VSWR
Voltage Standing Wave Ratio
电压驻波比

CEM600 EVDO Mini PCIE Module Hardware User Guide
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Page 5of 25
Chapter 2. Module review
2.1 Product Introduction
CEM600 is a PCI Express Mini Card 1.2 standard interface CDMA2000 1X EVDO
Rev.A module, using Qualcomm's latest EVDO single-chip platform QSC6085, supporting
embedded operating systems such as WinCE/Linux, with voice, SMS and high-speed data
services. The CEM600 can be used in the following situations:
Netbook, notebook
PDA、MID
Wireless POS machine
Wireless advertising, media
Wireless routing, switch
Remote monitoring
Smart meter reading
lottery machine
Other wireless terminals, etc.
2.2 Module function block diagram
The functional block diagram of the CEM600 module is shown in Figure 2-1 below:
Figure 2-1 Functional Block Diagram of the CEM600 Module

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Page 6of 25
2.3 Main function of the module
The main functions of the CEM600 module are as follows:
Support CDMA800/1900 frequency band
Support GPS function
Support for primary/diversity antenna reception
Support 1 USB 2.0 Fullspeed interface
Support 1 channel RUIM card interface (3.0V/1.8V)
Support 1 channel 3-wire UART interface
Support 1 PCM/I2S interface (transmits digital voice)
Support 4 channels of GPIO
Support 3 LED lights control
Extended AT instruction set supporting standard AT instruction set and domain

CEM600 EVDO Mini PCIE Module Hardware User Guide
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Chapter 3. Technical specifications
3.1 Overall technical indicators
The overall technical specifications of the CEM600 module are shown in the following table:
Table 3-1 Overall technical indicators
Characteristic
Description
CDMA standard
IS95A/B
CDMA2000 1x Rev.0
CDMA2000 1xEV-DO Rev. 0
CDMA2000 1xEV-DO Rev. A
Data rate
Upstream:1.8 Mbit/s Max
Downstream:3.1 Mbit/s Max
Working
frequency
CDMA 800MHz
Send:824–849 MHz
Receive:869–894 MHz
CDMA 1900MHz
Send:1850–1910 MHz
Receive:1930–1990 MHz
Operating Voltage
3.3~4.2V
Working current
Off：<10uA
Standby：<2mA
Peak：700mA
Size
51mm×30mm×2.6mm
Weight
16g
Temperature
Operating temperature
-30℃~ +70℃（Full parameter）
-40℃~ +85℃（Feature）
Storage temperature
-55℃~ +125℃
Humidity
5% ~ 95%
3.2 RF receiving indicators
The RF receiving indicators of the CEM600 module are shown in the following table:
Table 3-2 Radio Frequency Receive
Technical indicators
Description
Frequency Range
869–894 MHz
Receiving sensitivity
<-108 dBm
Receive signal range
-25 dBm~ -104dBm
Monophonic immunity
-101dBm(FER≤1%,-30dBm@±900KHz)
Intermodulation spurious response
attenuation
-101dBm(FER≤1%,-43dBm@±900 KHz /±1700KHz)
-90dBm(FER≤1%,-32dBm @±900 KHz /±1700KHz)
-79dBm(FER≤1%,-21dBm @±900 KHz /±1700KHz)
Conductive spurious
emissionemission
<-76dBm/1MHz（Receiving band）
<-61dBm/1MHz（Transmission band）

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<-47dBm/30KHz（Other frequencies）
Demodulation of forward traffic
channel under additive Gaussian
white noise conditions
FER≤3.0％（Test 1: Rate Set 1（9600bps）
FER≤1.0％（Test 2: Rate Set 1（9600bps）
FER≤0.5％（Test 3: Rate Set 1（9600bps）
FER≤1.0％（Test 4: Rate Set 1（4800bps）
FER≤1.0％（Test 5: Rate Set 1（2400bps）
FER≤1.0％（Test 6: Rate Set 1（1200bps）
FER≤3.0％（Test 7: Rate Set 2（14400bps）
FER≤1.0％（Test 8: Rate Set 2（14400bps）
FER≤0.5％（Test 9: Rate Set 2（14400bps）
FER≤1.0％（Test 10: Rate Set 2（7200bps）
FER≤1.0％（Test 11: Rate Set 2（3600bps）
FER≤1.0％（Test 12: Rate Set 2（1800bps）
3.3 RF emission indicators
The RF emission indicators of the CEM600 module are shown in the following table:
Table 3-3 RF emissions
Technical indicators
Description
Frequency Range
824 ~ 849 MHz
Maximum frequency
deviation
±300Hz
Maximum output power
> 23dBm
Minimum output power
< -50dBm
Open loop power control
（Test 1:－25dBm/1.23MHz）－48±9.5dBm
（Test 2:－60dBm/1.23MHz）－8±9.5dBm
（Test 3:－93.3dBm/1.23MHz）20±9.5dBm
Closed loop power
control
±24dB(9600bps Data rate)
±24dB(4800bps Data rate)
±24dB(2400bps Data rate)
±24dB(1200bps Data rate)
Conductive spurious
emission
-42dBc/30KHz or -54dBm/1.23MHz（|Δf|: 885KHz~1.98MHz）
-54dBc/30KHz or -54dBm/1.23MHz（|Δf|: 1.98MHz~4.00MHz）
<-36dBm/1kHz（|Δf| > 4MHz, 9KHz < f < 150KHz,）
<-36dBm/10kHz（|Δf| > 4MHz, 150kHz<f<30MHz,）
<-36dBm/100kHz（|Δf| > 4MHz, 30MHz<f<1GHz）
<-30dBm/1MHz（|Δf| > 4MHz, 1GHz<f<12.75GHz）

CEM600 EVDO Mini PCIE Module Hardware User Guide
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3.4 Power Supply DC Characteristics
The DC characteristics of the CEM600 module power supply are shown in the following
table:
Table 3-4 DC characteristics of the power supply
Parameter
Description
Min
Typical
Max
Unit
VCC
Module input power
3.3
3.3
4.2
V
VIH
Input high level
0.65*VDDIO
VDDIO+0.3
V
VIL
Input low level
-0.3
0.35*VDDIO
V
VOH
Output high level
VDDIO-0.45
VDDIO
V
VOL
Output low level
0
0.45
V
CIN
Input capacitance
-
7
pF
Here VDDIO = 2.6V.

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Chapter 4 Interface definition
The CEM600 module interface definition is shown in the following table:
Table 4-1 Interface definition
Pin
Standard
Pin definition
Pin definition
I/O
properties
Description
1
WAKE#
MIC_P
Analog input
Analog audio input positive
terminal (optional feature)
2
3.3Vaux
VCC_3V3
Power input
3.3V main power supply
3
COEX1
MIC_N
Analog input
Analog audio input negative
terminal (optional function)
4
GND
GND
Ground
5
COEX2
EAR_P
Analog
output
Analog audio output positive
terminal (optional feature)
6
1.5V
NC
Unused
7
CLKREQ#
EAR_N
Analog
output
Analog audio output negative
terminal (optional function)
8
UIM_PWR
VREG_RUIM
Power Output
RUIM card power supply
9
GND
GND
Ground
10
UIM_DATA
RUIM_DATA
Two way
RUIM card data
11
REFCLK-
UART1_RXD
Input
UART1 data reception (optional
function)
12
UIM_CLK
RUIM_CLK
Output
RUIM card clock
13
REFCLK+
UART1_TXD
Output
UART1 data transmission (optional
function)
14
UIM_RESET
RUIM_RESET
Output
RUIM card reset
15
GND
GND
Ground
16
UIM_Vpp
NC
Unused
17
Reserved
UART1_RI_N
Output
Ringing indication signal
18
GND
GND
Ground
19
Reserved
INT1_IN
Input
Interrupt input, "low" is valid
(optional function)
20
W_DISABLE#
W_DISABLE_N
Input
RF inhibit control, "low" effective
21
GND
GND
Ground
22
PERST#
RESIN_N
Input
Reset control, "low" is valid
23
PERn0
UART1_CTS_N
Input
UART1 is ready to send
24
3.3Vaux
VCC_3V3
Power input
3.3V auxiliary power supply
(optional function)
25
PERp0
UART1_RFR_N
Output
UART1 request to send
26
GND
GND
Ground
27
GND
GND
Ground

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28
1.5V
NC
Unused
29
GND
GND
Ground
30
SMB_CLK
GPIO1
Two way
General purpose input and output
signal 1 (optional function)
31
PETn0
UART1_DTR_N
Input
DTE is ready
32
SMB_DATA
GPIO3
Two way
General purpose input and output
signal 3 (optional function)
33
PETp0
UART1_DCD_N
Output
Carrier detect signal indication
34
GND
GND
Ground
35
GND
GND
Ground
36
USB_D-
USB_D-
Two way
USB data cable -
37
GND
GND
Ground
38
USB_D+
USB_D+
Two way
USB data cable +
39
3.3Vaux
VCC_3V3
Power input
3.3V main power supply
40
GND
GND
Ground
41
3.3Vaux
VCC_3V3
Power input
3.3V main power supply
42
LED_WWAN#
LED_WWAN_N
Power input
Work status light control, "low"
effective
43
GND
GND
Ground
44
LED_WLAN#
LED_RES1_N
Power input
Alternate LED Control 1 (optional
feature)
45
Reserved
PCM_CLK
Two way
PCM clock (optional feature)
46
LED_WPAN#
LED_RES2_N
Power input
Alternate LED Control 2 (optional
feature)
47
Reserved
PCM_DOUT
Two way
PCM data output (optional
function)
48
1.5V
NC
Unused
49
Reserved
PCM_DIN
Two way
PCM data input (optional function)
50
GND
GND
Ground
51
Reserved
PCM_SYNC
Two way
PCM sync (optional feature)
52
3.3Vaux
VCC_3V3
Power input
3.3V main power supply
Note: (optional feature) indicates that support or no support can be selected by resistor
soldering inside the CEM600 module.

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Chapter 5. Main function interface description
5.1 UART interface (optional function)
Table 5-1 UART Interface Definition
Pin
Signal name
I/O properties
High value
Description
11
UART1_RXD
Input
2.6V
UART1 data reception
13
UART1_TXD
Output
2.6V
UART1 data transmission
17
UART1_RI_N
Output
2.6V
UART1 ringing indication
23
UART1_CTS_N
Input
2.6V
UART1 is ready to send
25
UART1_RFR_N
Output
2.6V
UART1 request to send
31
UART1_DTR_
N
Input
2.6V
UART1 DTE is ready
33
UART1_DCD_
N
Output
2.6V
UART1 carrier detection
GND
Ground
The UART interface supports 3-wire or 8-wire serial protocols.
The UART interface supports the following features:
Software download upgrade
Data communication
AT Command
Bluetooth
When the UART interface is directly connected to the microprocessor, the reference
design is as follows. If the 3-wire connection is used, the RFR and CTS should be shorted.
Note that if the levels on both sides do not match, you can connect a 1k resistor in series with
the signal line or add a bidirectional Schottky diode.
Figure 5-1 UART interface and microprocessor connection reference design
The UART interface can also be connected to the standard RS232-C interface via an
RS232 level shifting chip. The MAX3232 chip is recommended. The reference design is as
follows:

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Figure 5-2 Serial connection reference design
5.2 USB interface
Table 5-2 USB Interface Definition
Pin
Signal name
I/O properties
High value
Description
36
USB_D-
Two way
3.3V
USB data cable -
38
USB_D+
Two way
3.3V
USB data cable +
GND
Ground
The USB interface supports USB 2.0 Fullspeed and Lowspeed. Note that CEM600 can only
be a slave device.
The USB interface supports the following features:
Software download upgrade
Data communication
AT Command
VBUS
DP
DN
59
12
10
Module
USB
DEVICE
VBUS
D+
D-
USB
HOST
Figure 5-3 USB interface signal
The USB interface reference design is shown below. Note that the ESD protection device
should be added to the data line.

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Figure 5-4 USB interface reference design
Note:
1. As shown in the USB interface reference design drawing, it should be noted that the
ESD protection device should be added to the data line. The USB trace design of the DTE
interface board needs to strictly follow the USB2.0 protocol requirements, and the differential
trace has a control impedance of 90Ω.
2. The USB bus supply voltage is provided internally by the module and does not need to
be provided externally. At the same time, since the USB interface of the module does not
provide USB bus power, the module can only be used as a slave device of the USB bus.
5.3 PCM interface (optional feature)
Table 5-3 PCM Interface Definition
Pin
Signal name
I/O properties
High value
Description
45
PCM_CLK
Two way
2.6V
PCM clock
47
PCM_DOUT
Two way
2.6V
PCM data output
49
PCM_DIN
Two way
2.6V
PCM data input
51
PCM_SYNC
Two way
2.6V
PCM synchronization
GND
Ground
This interface is a PCM/I2S interface and can support the following functions:
Bluetooth
Codec interface
DAC/ADC interface
The following figure shows an application of the PCM interface for digital voice
transmission. It is converted to analog voice by an external Codec chip, and then connected to
the MIC and RECEIVER.

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Figure 5-5 PCM digital voice application reference design
5.4 AUDIO interface
Table 5-4 AUDIO Interface Definition
Pin
Signal name
I/O properties
High value
Description
1
MIC_P
Analog input
1.8V
Audio input positive end
3
MIC_N
Analog input
1.8V
Audio input negative
5
EAR_P
Analog output
1.8V
Positive audio output
7
EAR_N
Analog output
1.8V
Audio output negative
GND
Ground
The AUDIO interface provides an audio input and output interface in differential mode.
The MIC bias voltage and DC blocking capacitors are already provided inside the module, so
the external design is no longer needed. The road audio output can drive a 32 ohm receiver.
The differential line of the differential audio interface should pay attention to the parallel
equidistance in the PCB design. The length of the trace should be as short as possible. The
filter circuits on both sides should be as symmetrical as possible. The positive and negative
differential signals should be as close as possible. The audio input and audio output need to be
separated to prevent crosstalk, while away from power, RF, antenna and other circuits. In
addition, ESD protection devices are recommended at the MIC, RECEIVER/SPEAKER
interfaces.The reference design of the differential audio input and output interface is as
follows:

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Figure 5-6 Differential Audio Interface Reference Design
The differential audio channel can also work in single-ended mode, such as an external
headphone jack. The single-ended audio interface is preferably packaged on the outside of the
PCB design. The audio input and the audio output need to be separated to prevent crosstalk.
At the same time, keep away from power, RF, antenna and other circuits. In addition, it is
recommended to add ESD protection devices at the interface.
The reference design diagram for the single-ended audio interface is as follows:
Figure 5-7 Single-ended audio interface reference design
5.5 RUIM card interface
Table 5-5 RUIM card interface definition
Pin
Signal name
I/O properties
High value
Description
8
VREG_RUIM
Output
1.8V/2.85V
RUIM card power supply
10
RUIM_DATA
Two way
1.8V/2.85V
RUIM card data
12
RUIM_CLK
Output
1.8V/2.85V
RUIM card clock
14
RUIM_RESET
Output
1.8V/2.85V
RUIM card reset
GND
Ground
The CEM600 module can be connected to a 3.0V/1.8V RUIM card and can be
automatically detected.

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It is recommended to connect 33 μcapacitors in parallel between RUIM_CLK,
RUIM_DATA, RUIM_RESET and GND to filter out the interference of RF signals, and
connect 33 ohm resistors in series on RUIM_CLK, RUIM_DATA, RUIM_RESET. Also, be
careful to place the ESD protection device next to the RUIM deck.
The RUIM card interface reference design diagram is as follows:
Figure 5-8 RUIM card interface reference design
5.6 Control and general purpose I/O interface (optional feature)
Table 5-6 Control and General I/O Interface Definitions
Pin
Signal name
I/O properties
High value
Description
17
INT0_OUT(GPIO)
Output
2.6V
Interrupt output, "low" is
valid, default is "high"
19
INT1_IN(GPIO)
Input
2.6V
Interrupt input, "low"
active, internal pullup
20
W_DISABLE_N(GPIO
)
Input
2.6V
RF is prohibited, "low" is
valid, internal pull-up
22
RESIN_N
Input
2.6V
Reset control, "low" active,
internal pullup
30
GPIO1
Two way
2.6V
General purpose input and
output signal 1(default is
input, internal pull-up)
31
GPIO2
Two way
2.6V
General purpose input and
output signal 1(default is
input, internal pull-up)
32
GPIO3
Two way
2.6V
General purpose input and
output signal 1(default is
input, internal pull-up)
33
GPIO4
Two way
2.6V
General purpose input and

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output signal 1(default is
input, internal pull-up)
42
LED_WWAN_N
Current input
3.3V
Work status light, "low" is
valid, default is "high"
44
LED_RES1_N
Current input
3.3V
Alternate LED light control
46
LED_RES2_N
Current input
3.3V
Alternate LED light control
GND
Ground
INT0_OUT, INT1_IN, W_DISABLE_N: When the default functions of these 3 pins are not
used, they can be multiplexed into GPIO.RESIN_N: The module can be reset by pulling this
pin low for 50ms. This pin is sensitive to interference and should be protected when wiring.
LED_WWAN_N, LED_RES1_N (standby), LED_RES2_N (standby): These three pins are
controlled by SINK type current source mode, and the maximum current that can flow in is
40mA. When external LED lamp is connected, the current limiting resistor must be connected
in series, and the resistance value can be The rated voltage/rated current of the selected LED
lamp is calculated.
The reference design of the LED light interface is as follows:
Figure 5-9 LED lamp reference design
LED_WWAN_N is the working status indicator of the CEM600G module, which is controlled
by the module software. The status table is as follows:
Table 5-7 LED_WWAN_N Status Indicator Table
CEM600G working mode
LED display status
Search network
Single flash (cycle is 3s)
Successfully registered network, but in idle
state (ie, not in call or data transfer state)
Double flash (cycle is 3s)
Call or data transfer status
Fast flashing (cycle is 0.2s)
5.7 Power interface
Table 5-8 Power Interface Definition
Pin
Signal name
I/O properties
High value
Description
2
VCC_3V3
power input
3.3V
3.3V main power supply
24
VCC_3V3
power input
3.3V
3.3V auxiliary power supply (optional
function)
39
VCC_3V3
power input
3.3V
3.3V main power supply

CEM600 EVDO Mini PCIE Module Hardware User Guide
Shang Hai YUGE Information Technology co., LTD
Page 19 of 25
41
VCC_3V3
power input
3.3V
3.3V main power supply
52
VCC_3V3
power input
3.3V
3.3V main power supply
GND
Ground
The CEM600 module receives a 3.3V power supply from external sources (±9% accuracy).
The maximum average power consumption of the module is about 700mA. It is recommended
to use an LDO or switching power supply of 1.5A or higher. In order to maintain the
instantaneous voltage stability during operation, it is recommended to add a large storage
capacitor, such as 220uF tantalum capacitor, to the power port of the motherboard.
5.8 Antenna socket interface
The module contains three RF antenna interfaces: main set, diversity and GPS. The main
antenna interface (M), the diversity antenna interface (A) and the GPS antenna interface (G)
provide two external antenna interfaces, namely an RF connector and an antenna pad. Both
interfaces can be arbitrarily selected, but only one of them can be selected. Cables and
antennas with a 50 ohm characteristic impedance must be selected.
Table 5-9 Antenna interface characteristics
Parameter
Conditions
Specifications
Sensitivity
1900 MHz
<-107 dBm（Typical）
800 MHz
<-107 dBm (Typical)
GPS
-155 dBm
RF output
power
1900 MHz
24.5 dBm (Typical)
800 MHz
24.5 dBm (Typical)
Gain
0 dBi (unity) gain or greater
Impedance
50Ω
VSWR
Less than 3.0:1
It is recommended to use an antenna with a gain value greater than 1 dBi.
According to the user's circuit board routing to debug the parameters of each device, you
can connect 68~100nH inductor to the ground to prevent static electricity. Pay attention to the
impedance matching and antistatic or lightning strike of the antenna.