ML8011 GSM GPRS Modem User’s Manual
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ML8011 GSM GPRS Modem User’s Manual
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ML8011 GSM GPRS Modem User’s Manual
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Content
ML8011 GPRS Modem User’s Manual .............................................................................................. 1
1. Introduction ....................................................................................................................................... 3
2. Product concept ................................................................................................................................. 3
3. Application interface ......................................................................................................................... 5
3.1Pin Description ............................................................................................................................. 5
3.2 Operating modes ......................................................................................................................... 6
3.3 Power supply (VBAT) ................................................................................................................ 7
3.4 Power up and power down scenarios ......................................................................................... 8
3.4.1 Power On .............................................................................................................................. 8
3.4.2 Power down module using the PWRKEY pin ................................................................... 9
3.4.3 Power down module using AT command .......................................................................... 9
3.4.4 Over-voltage or under-voltage automatic shutdown .......................................... 10
3.4.5 Restart module using the PWRKEY pin .......................................................................... 10
3.5 Power saving ............................................................................................................................. 11
3.5.1 Minimum functionality mode ........................................................................................... 11
3.5.2 SLEEP mode (slow clock mode) ...................................................................................... 12
3.5.3 Wake up module from SLEEP mode ............................................................................... 12
3.6 Summary of state transitions .................................................................................................... 12
3.7 Serial interfaces ......................................................................................................................... 13
3.8LED indication ........................................................................................................................... 13
3.8.1 Green Led is the power indication. ................................................................................... 13
3.8.2 Red Led is the Working state indication. ......................................................................... 13
4. Mechanical dimension .................................................................................................................... 14
5. Product List...................................................................................................................................... 15
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1. Introduction
This document defines the ML8011 module series and describes the hardware interface of the
ML8011 module that connects to the customer application.
This document can help customer quickly understand module interface specifications, electrical
and mechanical details. With the help of this document, associated application notes and user
guide, customer can use ML8011 module to design and set up mobile applications quickly.
2. Product concept
The ML8011 is a Quad-band GSM/GPRS engine that works at frequencies GSM850MHz,
GSM900MHz, DCS1800MHz andPCS1900MHz. The ML8011 features GPRS multi-slot class
12 and supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4.
The ML8011 is integrated with Internet service protocols, which are TCP/UDP, FTP and HTTP.
Extended AT commands have been developed for customer to use these Internet service protocols
easily.
Table 1 Module key features
Feature
Implementation
Power supply
Single supply voltage
3.6V – 4.6V,Normal 4.0V
Frequency bands
● Quad
-
band: GSM850, GSM900, DCS1800, PCS1900.
● The module can search these frequency bands automatically
● The frequency bands can be set by AT command.
● Compliant to GSM Phase 2/2+
Transmitting power
●Class 4 (2W) at GSM850 and GSM900
●Class 1 (1W) at DCS1800 and PCS1900
GPRS connectivity
● GPRS multi
-
slot class 12 (default)
● GPRS multi-slot class 1~12 (configurable)
● GPRS mobile station class B
Temperature range
● Normal operation:
-
35°C ~ +80°C
● Restricted operation: -45°C ~ -35°C and +80°C ~ +85°C
1)
● Storage temperature: -45°C ~ +90°C
DATA GPRS:
● GPRS data downlink transfer: max. 85.6 kbps
● GPRS data uplink transfer: max. 85.6 kbps
● Coding scheme: CS-1, CS-2, CS-3 and CS-4
● Support the protocols PAP (Password Authentication Protocol)
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CSD:
usually used for PPP connections
● Internet service protocols TCP/UDP/FTP/HTTP
● Support Packet Switched Broadcast Control Channel (PBCCH)
● CSD transmission rates: 2.4, 4.8, 9.6, 14.4 kbps non-transparent
● Unstructured Supplementary Services Data (USSD) support
SMS
● MT, MO, CB, Text and PDU mode
● SMS storage: SIM card
FAX
Group 3 Class 1 and Class 2
SIM interface
Port SIM card: 1.8V, 3V,Protected against ESD with a TVS diode
array.
Serial interface
● Support from 4800 bps to 115200 bps, default auto baud rate
● Support TTL(3.3V)
● Embed standard AT command（GSM07.05 and 07.07）
Phonebookmanagement
Support phonebook types: SM, FD, LD, RC, ON, MC
SIM Application Toolkit
Support SAT cla
ss 3, GSM 11.14 Release 99
Physical characteristics
45*32.5*12mm
1) When the module works in this temperature range, the deviations from the GSM specification
might occur. For example, the frequency error or the phase error could increase.
Table 2 Coding schemes and maximum net data rates over air interface
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
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3. Application interface
3.1Pin Description
Figure 1 Pin distribution
Table 3 Pin description
PIN NAME
PIN
I/O DESCRIPTION
DC
CHARATERISTICS
COMMENT
VBAT
1,2 I Module main power
supply. The power
supply of module has to
be a single voltage source
of VBAT = 3.6V~4.6V,it
must be able to provide
sufficient current in a
transmitting burst which
typically rises to 2A
Vmax = 4.6V
Vmin = 3.6V
Vnormal = 4.0V
Recommend to used
MIC29302/SP2930
2 High-Current
Low-Dropout
Regulators
VOUT
10 O
Supply 3.3V voltage
for
external circuit
Vmax = 3.4V
Vmin = 3.2V
Vnormal = 3.3V
Imax = 100mA
1. If unused, keep
this pin open.
2. Recommend to
added a 2.2~10uF
bypass capacitor
when using this pin
to power supply.
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GND
3,4,15
I
Power and digital ground
PWRKEY
5 I
Power
on/off control
input, PWRKEY should
be pulled up for a
moment to turn on or turn
off the module.
TTL (3.3V) level, it
can be connected to the
MCU/ARM I/O port
indirectly.
STATUS
7 O
Used to indicate the
module operating status.
High level indicates
module power on and low
level indicates power off.
TTL (3.3V) level, it
can be connected to the
MCU/ARM I/O port
indirectly.
If unused, keep this
pin open.
RXD
8 I
TTL:
UART Receiving data.
TTL:
LogicL:0V±0.3V;
LogicH: 3.3V±0.3V.
TXD
9 O
TTL:
UART Transmitting data.
RI 6 O
Ring indicator
TTL (3.3V) level, it
can be connected to the
MCU/ARM I/O port
indirectly.
If unused, keep
these pin open.
CTS 11 O Clear to sent
RTS 12 I Request to sent
DTR
13 I
Data terminal ready
DCD
14 O
Data
carrier detection
3.2 Operating modes
The table below briefly summarizes the various operating modes referred to in the following
chapters.
Table 4 Overview of operating modes
Mode
Function
Normal
operation
GSM/GPRS
SLEEP
The module will automatically go into SLEEP mode if
DTR is set to high level and there is no interrupt (such
as GPIO interrupt or data on serial port).
In this case, the current consumption of module will
reduce to the minimal level.
During SLEEP mode, the module can still receive
paging message and SMS from the system normally.
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GSM IDLE
Software is active. The mo
dule has registered to the
GSM network, and the module is ready to send and
receive.
GSM TALK
GSM connection is going. In this mode, the
power
consumption is decided by the configuration of Power
Control Level (PCL), dynamic DTX control and the
working RF band.
GPRS IDLE
The module is not registered to GPRS network. The
module is not reachable through GPRS channel.
GPRS
STANDBY
The
module is registered to GPRS network, but no
GPRS PDP context is active. The SGSN knows the
Routing Area where the module is located at.
GPRS
READY
The PDP context is active, but no data transfer is going
on. The module is ready to receive or send GPRS data.
The SGSN knows the cell where the module is located
at.
GPRS DATA
There is GPRS data in transfer. In this mode, power
consumption is decided by the PCL, working RF band
and GPRS multi-slot configuration.
POWER
DOWN
Normal shutdown by sending the
“AT+QPOWD=1” command, using the
PWRKEY pin. The power management ASIC disconnects the power
supply from the base band part of the module, and only the power supply
for the RTC is remained. Software is not active. The serial interfaces are
not accessible. Operating voltage (connected to VBAT) remains applied.
Minimum
functionality
mode (without
removing power
supply)
Use the “AT+CFUN” command can set the module to a minimum
functionality mode without removing the power supply. In this case, the
RF part of the module will not work or the SIM card will not be
accessible, or both RF part and SIM card will be closed all, but the serial
port is still accessible. The power consumption in this case is very low.
3.3 Power supply (VBAT)
The power supply of the module is from a single voltage source of VBAT= 3.6V...4.6V. The
GSM transmitting burst can cause obvious voltage drop at the supply voltage thus the power
supply must be carefully designed and is capable of providing sufficient current up to 2.0A.
The circuit design of the power supply for the module largely depends on the power source.
Figure 2 shows a reference design of +5V input power source. The designed output for the power
supply is 4.0V, thus a linear regulator can be used. If there’s a big voltage difference between the
input source and the desired output (VBAT), a switching converter power supply would be
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preferable for its better efficiency especially with the 2.0A peak current in burst mode of the
module.
Figure 2 recommend Power supply
3.4 Power up and power down scenarios
3.4.1 Power On
Customer’s application can turn on the module by driving the pin PWRKEY to a high level
voltage and after STATUS pin outputs a high level, PWRKEY pin can be released. Customer
may monitor the level of the STATUS pin to judge whether the module is power-on or not. If the
STATUS pin is ignored, pull the PWRKEY pin to high level for more than 2 seconds to turn on
the module. The power on timing is illustrated as following figure 3.
Figure 3 Timing of turn on the module
①Ensure the VBAT voltage stability before driving the pin PWRKEY to a high level voltage.
Recommend at least time intervals of 30 ms.
Note: The module is set to auto baud rate mode (AT+IPR=0) in default configuration. In the auto
baud rate mode, the URC “RDY” after powering on is not sent to host controller. AT command
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can be sent to the module 2-3 seconds after the module is powered on. Host controller should
firstly send an “AT” or “at” string in order that the module can detect baud rate of host controller,
and it should send the second or the third “AT” or “at” string until receiving “OK” string from
module. If you need to using fixed baud rate, Then an “AT+IPR=x;&W” should be sent to
module and save the configuration to flash memory of module. After these configurations, the
URC “RDY” would be received from the Serial Port of module every time when the module is
powered on. Refer to Chapter “AT+IPR” in AR command manual.
3.4.2 Power down module using the PWRKEY pin
Customer’s application can turn off the module by driving the PWRKEY to a high level voltage
for certain time. The power-down scenario is illustrated as in Figure 4.
Figure 4 Timing of turn off the module
The power-down procedure causes the module to log off from the network and allows the
software to save important data before completely disconnecting the power supply, thus it is a
safe way. Before the completion of the power-down procedure the module sends out the result
code shown below:
NORMAL POWER DOWN
After this moment, no further AT command can be executed, and then the module enters the
POWER DOWN mode, The POWER DOWN mode can also be indicated by STATUS pin,
which is a low level voltage in this mode.
3.4.3 Power down module using AT command
Customer’s application can use an AT command “AT+QPOWD=1” to turn off the module. This
command will let the module to log off from the network and allow the software to save
important data before completely disconnecting the power supply, thus it is a safe way.
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Before the completion of the power-down procedure the module sends out the result code shown
below:
NORMAL POWER DOWN
After this moment, no further AT command can be executed, and then the module enters the
POWER DOWN mode, The POWER DOWN mode can also be indicated by STATUS pin,
which is a low level voltage in this mode.
3.4.4 Over-voltage or under-voltage automatic shutdown
The module will constantly monitor the voltage applied on the VBAT, if the voltage ≤ 3.5V, the
following URC will be presented:
UNDER_VOLTAGE WARNNING
If the voltage ≥ 4.5V, the following URC will be presented:
OVER_VOLTAGE WARNNING
The uncritical voltage range is 3.6V to 4.6V. If the voltage > 4.6V or <3.3V, the module would
automatically shut down itself.
If the voltage <3.3V, the following URC will be presented:
UNDER_VOLTAGE POWER DOWN
If the voltage >4.6V, the following URC will be presented:
OVER_VOLTAGE POWER DOWN
After this moment, no further AT command can be executed, the module logoff from network
and enters POWER DOWN mode, The POWER DOWN mode can also be indicated by the pin
STATUS, which is a low level voltage in this mode.
3.4.5 Restart module using the PWRKEY pin
Customer’s application can restart the module by driving the PWRKEY to a high level voltage
for certain time, which is similar to the way to turn on module. Before restarting the module, at
least
500msshould be delayed after detecting the low level of STATUS. The restart scenario is
illustrated as the following figure 5
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Figure 5 Timing of restart system
3.5 Power saving
Upon system requirement, there are several actions to drive the module to enter low current
consumption status. For example, “AT+CFUN” can be used to set module into minimum
functionality mode and DTR hardware interface signal can be used to lead system to SLEEP
mode.
3.5.1 Minimum functionality mode
Minimum functionality mode reduces the functionality of the module to minimum level, thus
minimizes the current consumption when the slow clocking mode is activated at the same time.
This mode is set with the “AT+CFUN” command which provides the choice of the functionality
levels <fun>=0,1,4.
●0: Minimum functionality;
●1: Full functionality (default);
●4: Disable both transmitting and receiving of RF part;
If the module is set to minimum functionality by “AT+CFUN=0”, the RF function and SIM card
function would be closed. In this case, the serial port is still accessible, but all AT commands
correlative with RF function or SIM card function will not be accessible.
If the module has been set by “AT+CFUN=4”, the RF function will be closed, the serial port is
still active. In this case, all AT commands correlative with RF function will not be accessible.
After the module is set by “ AT+CFUN=0” or “AT+CFUN=4”, it can return to full functionality
by “AT+CFUN=1”.
For detailed information about “AT+CFUN”, please refer to AT command manual.
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3.5.2 SLEEP mode (slow clock mode)
The SLEEP mode is disabled in default software configuration. Customer’s application can
enable this mode by “AT+QSCLK=1”. On the other hand, the default setting is “AT+QSCLK=0”
and in this mode, the module can’t enter SLEEP mode.
When “AT+QSCLK=1” is set to the module, customer’s application can control the module to
enter or exit from the SLEEP mode through pin DTR. When DTR is set to high level, and there is
no on-air or hardware interrupt such as GPIO interrupt or data on serial port, the module will
enter
SLEEP mode automatically. In this mode, the module can still receive voice, SMS or GPRS
paging from network but the serial port is not accessible.
3.5.3 Wake up module from SLEEP mode
When the module is in the SLEEP mode, the following methods can wake up the module.
●If the DTR Pin is pulled down to a low level, it would wake up the module from the SLEEP
mode. The serial port will be active about 20ms after DTR changed to low level.
●Receiving a voice or data call from network to wake up module.
●Receiving an SMS from network to wake up module.
Note: DTR pin should be held low level during communicating between the module and
Customer’s application.
3.6 Summary of state transitions
Table 5 Summary of state transition
Current mode
Next mode
Power Down
Normal Mode
Sleep Mode
Power Down
Use PWRKEY
pin
Normal mode
AT+QPOWD or
use PWRKEY pin,
Set AT+QSCLK=1
and pull up the DTR
pin to high level
Sleep Mode
Use PWRKEY pin
Pull down DTR
pin to low level,
Receiving a voice
or data call from
network,
Receiving an
SMS from
network
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3.7 Serial interfaces
The connection schematic between ML8011 and MCU/ARM shown in figure 6, Dotted line:
optional connection.
Figure 6 connect to MCU/ARM
3.8LED indication
3.8.1 Green Led is the power indication.
3.8.2 Red Led is the Working state indication.
The Working state of this LED is list in the table 6.
Table 6 Working state of the RED Led
state
Module Function
Off The module is not running(Power Off)
64ms On/800ms Off
The module is not synchronized with
network
64ms On/2000ms Off
The module is synchronized with network
64ms On/600ms Off
GPRS data transfer is ongoing.
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4. Mechanical dimension
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5. Product List
Name
Unit Quantity
Describe
Picture
ML8011
Item 1 Module
Antenna
Item 1 Standard Supply
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