MX680 Hardware Design V2.00
MX680
Hardware Design V2.00
MX680 Hardware Design 1 / 58
MX680 Hardware Design V2.00
Document Title
MX680 Hardware Design
Version
2.00
Date
2014-05-12
Status
Release
Document Control ID
General Notes
ZhiwuCom offers this information as a service to its customers, to support application and
engineering efforts that use the products designed by ZhiwuCom. The information provided
is based upon requi rement s sp eci fical ly provided to ZhiwuCom by the custo mers. ZhiwuCom
has not undertak en a ny indepen dent searc h f or addit ional relevant inform atio n, incl udi ng any
information that may be in the customer’s posses si on. F ur th er m or e, s ystem validation of th i s
product designed by ZhiwuCom within a larger electronic system remains the responsibility
of the customer or the customer’s system integrator. All specifications supplied herein are
subject to change.
Copyright
This document contains proprietary technical information which is the property of ZhiwuCom
Limited, copying of this document and giving it to others and the using or communication of
the contents thereof, are forbidden without express authority. Offenders are liable to the
payment of da mages . All rights reserved i n th e ev ent o f grant of a pa tent or the r egi strati on of
a utility model or design. All specification supplied herein are subject to change without
notice at any time.
Copyright © Shanghai ZhiWu Communication Technology Co.,Ltd. 2012
MX680 Hardware Design 2 / 58
MX680 Hardware Design V2.00
Contents
Version History ...................................................................................................................... 6
1. Introduction ....................................................................................................................... 7
2. MX680 Overview ............................................................................................................... 7
2.1. MX680 Key Features .............................................................................................. 7
2.2. Operating Mode ...................................................................................................... 9
2.3. Functional Diagram ................................................................................................ 11
3. Package Information ........................................................................................................12
3.1. Pin out Diagram .....................................................................................................12
3.2. Pin Description .......................................................................................................13
3.3. Package Dimensions .............................................................................................17
4. Application Interface .........................................................................................................19
4.1. Power Supply .........................................................................................................19
4.1.1. Power supply pin ..........................................................................................21
4.1.2. Monitoring Power Supply .............................................................................21
4.2. Power on/down Scenarios......................................................................................22
4.2.1. Power on MX680 .........................................................................................22
4.2.2. Power down MX680 .....................................................................................23
4.3. Power Saving Mode ...............................................................................................26
4.3.1. Minimum Functionality Mode .......................................................................26
4.3.2. Sleep Mode (AT+QSCLK=1) ........................................................................26
4.3.3. Wake Up MX680 from Sleep Mode (AT+QSCLK=1) ....................................27
4.4. Serial Port and USB Interface ................................................................................27
4.4.1. Function of Serial Port ..................................................................................28
4.4.2. Serial Interfaces ...........................................................................................28
4.4.3. Debug Interface ...........................................................................................30
4.4.4. Software Upgrade and Debug ......................................................................31
4.4.4. UART Application .........................................................................................32
4.5. SIM Card Interface .................................................................................................34
4.5.1. SIM Card Application....................................................................................34
4.5.2.6 Pin SIM Cassette .......................................................................................35
4.6. RI Behaviors ...........................................................................................................36
4.7. Network Status Indication .......................................................................................38
4.8. Operating Status Indication ....................................................................................39
4.8. Antenna Interface ...................................................................................................40
4.8.1. Antenna Interface .........................................................................................40
4.9. A udi o Interfaces .....................................................................................................42
4.9.1 Microphone Int er fac es Co n fig ur ati on ............................................................43
4.9.2 S peaker Interfaces Con fig ur ati o n ..................................................................43
4.9.3 Earphone Interfaces Configuration ...............................................................44
4.9.4 Audio Electronic C har act eri s ti c .....................................................................44
4.9.5 TDD...............................................................................................................45
5. Electrical, Reliability and Radio Characteristics ...............................................................46
5.1 Absolute Maximum Ratings .....................................................................................46
5.2 Operating Temperature ...........................................................................................46
5.3 Digital Interface Characteristics ...............................................................................47
5.4 SIM Card Interface ..................................................................................................47
5.5 SIM_VDD Characteristics........................................................................................48
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MX680 Hardware Design V2.00
5.6 VDD_EXT Characteristics .......................................................................................48
5.7 Current Consumption(VBAT=4.0V) .........................................................................48
5.8 Electro-Static Discha rge ..........................................................................................50
5.9 Radio Characteristics ..............................................................................................51
5.9.1. Module RF Output Power .............................................................................51
5.9.2. Module RF Receive Sensitivity ....................................................................52
5.9.3. Module Operating Frequencies ....................................................................52
6. Manufacturing ..................................................................................................................53
6.1. Top and Bottom View of MX680 .............................................................................53
6.2. Typical Solder Reflow Profile ..................................................................................54
6.3. The Moisture Sensitivity Level(MSL) ......................................................................54
7. Appendix ..........................................................................................................................54
7.1. T erms and Abbreviations ........................................................................................54
7.2. Safety Caution ........................................................................................................57
Table Index
Table 1 : MX680 key features ....................................................................................... 7
Table 2 : Coding schemes and maximum net data rates over air interface .................... 9
Table 3 : Overview of operating modes .......................................................................... 9
Table 4 : MX680 pin assignment ...................................................................................13
Table 5 : Pin description ................................................................................................13
Table 6 : Serial port and USB pin definition ...................................................................27
Table 7 : Serial port characteristics ...............................................................................27
Table 8 : VBUS operation voltage .................................................................................31
Table 9 : SIM pin definition ............................................................................................34
Table 10 : Pin Description of Amphenol SIM Card Holder .............................................36
Table 11 : RI behaviors ..................................................................................................36
Table 12 : Working State of the NETLIGHT ...................................................................38
Table 13 : Pin Definition of the STATUS ........................................................................39
Table 14 : Audio interface definition ...............................................................................42
Table 15 : Microphone input characteristics ..................................................................44
Table 16 : Audio output characteristics ..........................................................................44
Table 17 : Absolute maximum ratings ............................................................................46
Table 18 : Operating Temperature .................................................................................46
Table 19 : Digital interface characteristics .....................................................................47
Table 20 : 3V SIM ..........................................................................................................47
Table 21 : 1.8V SIM .....................................................................................................47
Table 22 : SIM_VDD characteristics ..............................................................................48
Table 23 : VDD_EXT Characteristics ............................................................................48
Table 24 : Current consumption ....................................................................................48
Table 25 : The ESD characteristics (Temperature: 25 ℃, Hum idity: 45 % ) ....................50
Table 26 : GSM850 and EGSM900 conducted RF output power ..................................51
Table 27 : DCS1800 and PCS1900 conducted RF output power ..................................51
Table 28 : Conducted RF receive sensitivity .................................................................52
Table 29 : Operating frequencies ..................................................................................52
Table 30 : Terms and abbreviations ...............................................................................54
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MX680 Hardware Design V2.00
Table 31 : Safety caution ...............................................................................................57
Figure Index
Figure 1 : MX680 functional diagram ............................................................................ 11
Figure 2 : MX680 pin out diagram (Top view) ................................................................12
Figure 3 : Dimensions of MX680 (Unit: mm) .................................................................17
Figure 4 : Recommended PCB footprint outline (U nit : mm) ..........................................18
Figure 5 : Reference circuit of the LDO power supply ...................................................19
Figure 6 : Reference circuit of the DC-DC power supply ...............................................20
Figure 7 : VBAT voltage drop during transmit burst .......................................................20
Figure 8 : The minimal VBAT voltage requirement at VBAT drop ..................................21
Figure 9 : Powered on/down module using transistor ...................................................22
Figure 10 : Powered on/down module using button ......................................................22
Figure 11 : Timing of power on module .........................................................................23
Figure 12 : Timing of power down MX680 by PWRKEY ................................................24
Figure 13 : Connection of the serial interfaces ..............................................................29
Figure 14 : Reference Design for UART Port ................................................................29
Figure 15 : Reference Design for UART Port with Hardware Flow Control ...................30
Figure 16 : USB reference circuit ..................................................................................30
Figure 17 : Connection for software upgrading and debugging .....................................31
Figure 18 : Level Matc h Desi g n for 3. 3V System ..........................................................32
Figure 19 : Level Match Design for 5V System .............................................................33
Figure 20 : Level Match Design for RS-232 ..................................................................33
Figure 21 : Referenc e C ir c ui t for 6-pin SIM Card Holder ...............................................34
Figure 22 : Amphen ol C707 10M006 512 2 SIM Card Holder .......................................36
Figure 23 : RI Behavior of Voice Calling as a Receiver .................................................37
Figure 24 : RI Behavior of Data Calling as a Receiver ..................................................37
Figure 25 : RI Behavior as a Caller ...............................................................................37
Figure 26 : RI Behavior of URC or SMS Received ........................................................38
Figure 27 : Reference Design for NETLIGHT ...............................................................39
Figure 28 : Reference Design for STATUS ....................................................................40
Figure 29 : GSM antenna matching circuit ....................................................................41
Figure 30 : GSM simple antenna matching circuit .........................................................41
Figure 31 : Speaker with amplifier reference circuit.......................................................43
Figure 32 : Speaker reference circuit ............................................................................43
Figure 33 : Earphone reference circuit ..........................................................................44
Figure 34 : Top and bottom view of MX680 ...................................................................53
Figure 35 : Ramp-Soak-Spike Reflow Profile ................................................................54
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MX680 Hardware Design V2.00
Date
Version
Description of change
Author
2013-11-13
1.00
Origin
lihui
2014-05-12
1.10
HD update
lihui
2015-10-10
2.00
HD update
Zhaohaijun
Version History
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MX680 Hardware Design V2.00
Feature
Implementation
Power supply
Single supply voltage: 3.4V~4.4V
Typical supply voltage: 4V
Power saving
Typical power consumption in SLEEP mode: 1.1 mA@ DRX=5
0.9 mA@ DRX=9
Frequency bands
Quad-band: GSM850, GSM900, DCS1800, PCS1900
The frequency bands can be set by AT command
1. Introduction
This document describ es MX680 hardware interface in great detail.
This document ca n help user to q ui ck l y understand MX680 interface s peci ficatio ns, elec tric al
and mechanical details. With the help of this document and other MX680 application notes,
user guide, users can use MX680 to design various applications quickly.
2. MX680 Overview
MX680 is a Quad-band GSM/GPRS engine that works at frequencies of GSM850MHz,
GSM900MHz,DCS180 0MH z and PCS1900M Hz . The MX680 features GPRS multi-slot class
12 and supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4. For more details
about GPRS multi-slot classes and coding schemes, please refer to the Appendix B & C.
With a tiny profile of 19.9mm×23.6mm×2.65mm, the module can meet almost all the
requirements for M2M applications, including Vehicles and Personal Tracking, Security
System, Wireless POS, Industri al PDA, Smart Met eri ng , and R e mot e Maintenance & Control,
etc.
MX680 is an SMD type module with LCC package, which can be easily embedded into
applications. It provides abundant hardware interfaces like Audio and UART
Interface.Designed with power saving technique, the current consumption of MX680 is a s
low as 1.1 mA in SLEEP mode when DRX is 5.
MX680 is integrated with Internet service protocols, such as TCP/UDP, FTP and PPP.
Extended AT commands have been developed for you to use these Internet service
protocols easily.
The module fully complies with the RoHS directive of the European Union.
2.1. MX680 Key Features
Table 1: MX680 key features
●
● The module can search these frequency bands automatically
●
MX680 Hardware Design 7 / 58
Compliant to GSM Phase 2/2+
Transmitting
power
Class 4 (2W)：GSM850、EGSM900
Class 1 (1W)：DCS1800、PCS1900
GPRS
GPRS multi-slot class 12（default）
GPRS mobile station class B
Temperature
Normal operation：-35
+80℃
Storage temperature：-45
+90℃
Data GPRS
GPRS data downlink transfer: max. 85.6 kbps
Support Packet Broadcast Control Channel (PBCCH)
USSD ● Unstructured Supplementary Services Data (USSD) support
SMS ● MT, MO, CB, Text and PDU mode
SMS storage: SIM card
SIM interface
Support SIM card: 1.8V, 3V
External antenna
Antenna pad, Bluetooth antenna pad, FM antenna pad
Audio features
Speech codec modes:
Noise Suppression）
Serial port and
Full modem interface with status and control lines, unbalanced,
upgrading firmwar e
USB ● USB_DM and USB_DP
Can be used for debugging and upgrading firmware.
SIM application
toolkit
GSM 11.14 Release 99
Real time clock
Support RTC
Timing functions
Use AT command set
Size
19.9*23.6*2.65mm
Weight
2.8g
Firmware
upgrade
Main serial port or USB port.
connectivity
range
MX680 Hardware Design V2.00
●
●
●
●
● GPRS multi-slot class 1~12 (option)
●
●
● Restricted operation: -40°C ~ -35°C and +80°C ~ +85°C 1)
●
●
● GPRS data uplink transfer: max. 85.6 kbps
● Coding scheme: CS-1, CS-2, CS-3 and CS-4
● PAP protocol for PPP conn ect
● Integrate the TCP/IP protocol.
●
●
℃ ～
℃ ～
debug port
● Half Rate (ETS 06.20)
● Full Rate (ETS 06.10)
● Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80)
● Adaptive multi rate (AMR)
● Echo Cancellation
●
●
asynchronous.
● 1200bps to 115200bps .
● Can be used for AT commands or data stream.
● Support RTS/CTS hardware handshake and software ON/OFF
flow control.
● Multiplex ability according to GSM 07.10 Multiplexer Protocol.
● Autobauding supports baud rate from 1200 bps to 57600bps.
●
●
Note:When the module works within this temperature range, the deviations from the GSM
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MX680 Hardware Design V2.00
Coding scheme
1 Timeslot
2 Timeslot
4 Timeslot
CS-1:
9.05kbps
18.1kbps
36.2kbps
CS-2:
13.4kbps
26.8kbps
53.6kbps
CS-3:
15.6kbps
31.2kbps
62.4kbps
CS-4:
21.4kbps
42.8kbps
85.6kbps
Mode
Function
Normal
GSM/GPRS
Module will automatically go into sleep mode if the
In this case, the current consumption of module will
In sleep mode, the module can still receive paging
message and SMS.
GSM IDLE
Software is active. Module is registered to the GSM
network, and the module is ready to communicate.
GSM T ALK
Connection between two subscribers is in progress.
consumption depends on
FR/EFR/HR, hopping sequences, antenna.
GPRS IDLE
The module is not registered to GPRS network. The
module is not reachable through GPRS channel.
GPRS
Module is ready for GPRS data transfer, but no data
received. In this case, power
configuration.
GPRS
The PDP context is active, but no data transfer is
e is ready to receive or send GPRS data.
SGSN knows the cell where the module is located at.
GPRS DATA
There is GPRS data transfer (PPP or TCP or UDP) in
power consumption is related
uplink/downlink data rates and GPRS configuration
(e.g. Used multi-slot settings).
specification may occur. For example, the frequency error or the phase error will be
increased
Table 2: Coding schemes and maximum net data rates over air interface
2.2. Operating Mode
The table below summarizes the various operating modes of MX680.
Table 3: Overview of operating modes
operation
SLEEP
STANDBY
READY
conditions of sleep mode are enabling and there is no
on air and no hardware interrupt (such as GPIO
interrupt or data on serial port).
reduce to the minimal level.
In this case, the power
network settings such as DTX off/on,
is currently sent or
consumption depen ds on n et work settings an d GPRS
ongoing.
The modul
The
MX680 Hardware Design 9 / 58
progress. In this case,
with network settings (e.g. power control level);
MX680 Hardware Design V2.00
Power down
Normal power down by sending AT command “AT+QPOWD=1” or
The power management unit shuts down the
is not accessible. Power supply (connected to VBAT) remains applied.
Minimum
A T comma nd “AT+CFUN” can be used t o set t he module to a minimum
without removing the power supply. In this mode,
or the SIM card will not be
umption in this mode is lower
than normal mode.
using the PWRKEY.
power supply for the baseband part of the module, and only the po wer
supply for the RT C is remained. Software is not active. The serial port
functionality
mode
functionality mode
the RF part of the module will not work
accessible, or both RF part and SIM card will be closed, and the serial
port is still accessible. The power cons
MX680 Hardware Design 10 / 58
MX680 Hardware Design V2.00
Transceiv
Power Supply
RTC
Turn On
UART
FM
BT
2.3. Functional Diagr a m
The following figure shows a functional diagram of MX680:
● GSM baseband
● GSM RF
● Power management
● Antenna interface
● Other interface
● FM，BT
/Turn off
Audio
Figure 1: MX680 functional diagram
PMU
BaseBand Engine
PA
SIM
GPIO
USB
MX680 Hardware Design 11 / 58
MX680 Hardware Design V2.00
3. Package Information
3.1. Pin out Diagram
Figure 2: MX680 pin out diagram (Top view)
MX680 Hardware Design 12 / 58
MX680 Hardware Design V2.00
Pin
number
Pin name
I/O Pin
number
Pin name
I/O
1
AGND
2
MIC2P
I 3 MIC2N
I 4
MIC1P
I 5 MIC1N
I 6
SPK1N
O 7 SPK1P
O 8
SPK2N
O 9 SPK1N
O 10
PWRKEY
I
11
RESETB
I 12
STATUS
O
13
NETLIGHT
O 14
USB_DM
I
15
USB_DP
O 16
SIM2_DATA
A
17
SIM2_CLK
A 18
SIM2_VDD
A
19
VDD28
O 20
DTR
I
21
TXD
O 22
RXD
I
23
CTS
O 24
RTS
I
25
DCD/SIM2_RST
O 26
RT O 27
SIM_VDD
O 28
SIM_RST
O
29
SIM_DATA
I/O 30
SIM_CLK
O
31
SIM_GND
32
VRTC
AI
33
VBAT
AI 34
VBAT
AI
35
GND
36
GND
37
GND
38
GND
39
RF_ANT
A 40
GND
41
VBUS
I 42
NC
A
43
D_TXD
O 44
D_RXD
I
45
NC
A 46
ADC
Power supply
Pin name
Pin
I/O
Description
DC
Comment
VBAT
33
AI
Power supply
Vmax=4.4V
Make sure that
rises to 1.6A.
VRTC
32
AI
Power supply for
RTC
VImax=VBAT
VImin=2.6V
If these pins are
unused,
Table 4: MX680 pin assignment
3.2. Pin Description
Table 5: Pin description
number
34
VBAT=3.4V～4.4V
characteristics
Vmin=3.4V
Vnorm=4.0V
supply sufficient
current in a
transmitting
burst typically
MX680 Hardware Design 13 / 58
MX680 Hardware Design V2.00
VInorm=2.8V
Iin=2.6～5uA
keep open.
VDD28
19 O 2.8V power output
Vmax=2.9V
1.If these pins
add a
when using this
for power
supply.
GND
35，36
40
Ground
Power on/off
Pin name
Pin
number
I/O
Description
DC
characteristics
Comment
PWRKEY
10 I PWRKEY should
module.
VILmax=
Internally pulled
Reset
Pin name
Pin
number
I/O
Description
DC
characteristics
Comment
RESETB
11
I/O
Reset inpu
VILmax=0.4V
V
If these pins are
Module Indicator
Pin name
Pin
number
I/O
Description
DC
characteristics
Comment
STATUS
12 O Indicate module’s
Output high level
module turns
low level when
module turns off.
VOHmin=
If these pins are
Audio interfaces
Pin name
Pin
I/O
Description
DC
Comment
VOmax=2.85V
VOmin=2.6V
VOnorm=2.8V
Iout(max)=730u
A
，
37， 38 ，
be pulled low at
least 1 second and
then released to
power on/down the
Vmin=2.7V
Vnorm=2.8V
Imax=20mA
0.1*VBAT
VIHmin=
0.6*VBAT
VImax=VBAT
are unused,
keep open.
2.Recommend
to
2.2~4.7uF
Bypass
capacitor,
pin
up to VBAT.
MX680 Hardware Design 14 / 58
t(Active low)
operating status.
when
on, while output
VIHmin=2.2V
Vopenmax=2.8
0.85*VDD_EXT
VOLmax=
0.15*VDD_EXT
unused,
keep open.
unused,keep
open.
number
characteristics
MIC1P
MIC1N
4 5 I
Channel 1 positive
and negative voice
input
MIC2P
2 3 I
Channel 2 positive
and negative voice
input
SPK1P
7 6 O
Channel 1 positive
and negative voice
output
SPK2_P
9 8 O
Channel 2 positive
and negative voice
1. Integrate a
ringtone output.
AGND
1
Separate ground
connection for
external audio
circuits
If these pins are
Network Status Indicator
Pin name
Pin
number
I/O
Description
DC
characteristics
Comment
NETLIGHT
13 O Network status
VOHmin=
0.15*VDD_EXT
If these pins are
UART Port
Pin name
Pin
number
I/O
Description
DC
characteristics
Comment
DTR
20 I Data terminal
ready
VILmin=-0.3V
0.15*VDD_EXT
If only use TXD,
RXD and GND
TXD
21 O Transmit data
RXD
22 I Receive data
CTS
23 O Clear to send
RTS
24 I Request to send
DCD
25 O Data carrier detect
RI
26 O Ring indicator
D_TXD
43 O Debug
Transmit data
D_RXD
44 I Debug
Receive data
USB Port
Pin name
Pin
I/O
Description
DC
Comment
MIC2N
SPK1N
MX680 Hardware Design V2.00
可单路输出
SPK2_N
output
Analog ground ，
indication
0.85*VDD_EXT
VOLmax=
Class-AB
amplifier
internally.
2. Support both
Voice and
unused,keep
open.
unused,keep
open.
MX680 Hardware Design 15 / 58
VILmax=
0.25*VDD_EXT
VIHmin=
0.75*VDD_EXT
VIHmax=
VDD_EXT+0.3
VOHmin=
0.85*VDD_EXT
VOLmax=
to
communicate,
Recommended
other pin open
MX680 Hardware Design V2.00
number
characteristics
USB_DM
14
used for debugging
and upgrading
VBUS_max=5.
V
If these pins are
USB_DP
15
VBUS
41
I
SIM card interface
Pin name
Pin
number
I/O
Description
DC
characteristics
Comment
SIM1_VDD
27 O Voltage supply for
SIM card
3V_SIM:
0.9*SIM_VDD
All signals of
should be
against ESD
TVS diode
SIM1_RST
28 O SIM1 reset
SIM1_DATA
29
I/O
SIM1 data
input/output
SIM1_CLK
30 O SIM1 clock
SIM1_GND
31 SIM1 ground
SIM2_DATA
16
I/O
SIM2 data
If these pins are
SIM2_CLK
17 O SIM2 clock
SIM2_VDD
18 O Voltage supply for
SIM2 card
SIM2_RST
25 O SIM2 reset
Antenna interface
Pin name
Pin
number
I/O
Description
DC
characteristics
Comment
RF_ANT
39 Connect GSM
antenna
firmware.
SIM1 card.
Support 1.8V or 3V
6V
VBUS_min=4.4
V
VBUS_norm=5
VOLmax=0.36
VOHmin=
0.9*SIM_VDD
1.8V_SIM:
VOLmax=
0.2*SIM_VDD
VOHmin=
unused,keep
open.
SIM interface
protected
with a
array.
unused,keep
open.
MX680 Hardware Design 16 / 58
MX680 Hardware Design V2.00
3.3. Package Dimensions
Figure 3: Dimensions of MX680 (Unit: mm)
MX680 Hardware Design 17 / 58
MX680 Hardware Design V2.00
Figure 4: Recommended PCB footprint outline (Unit: mm)
MX680 Hardware Design 18 / 58
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