Simcom 2011091410099 GSM/GPRS Module User Manual SIM900L Rev 3

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Date Submitted	2011-10-10 00:00:00
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SIM900L Document
SIM900L User Manual
Note: This device complies with part 15 Rules. Operation is subject to the following two conditions: (1) This
device may not cause harmful interference, and (2) this device must accept any interference received, including
interference that may cause undesired operation.
If this equipment is installed in a host, We can find the ID label when opening the host. For label requirement
when transmitter module is installed in a host, the host shall have an additional permanent label referring to the
enclosed module:“Contains Transmitter Module FCC ID: UDV-2011091410099” or “Contains FCC ID:
UDV-2011091410099”.
This equipment has a GSM antenna, and the GSM antenna peak gain is 3 dBi and modulation type is GMSK.
WARNING: Changes or modifications to this unit not expressly approved by the party responsible for
compliance could void the user's authority to operate the equipment. The antenna of the product, under normal
use condition is at least 23.21 cm away from the body of the user,the user must keeping at least 23.21cm
distance to the antenna.
The device has been evaluated to meet general RF exposure requirement. The device can be used in portable
exposure condition without restriction.
1. SIM900L Description
1.1 Summarize
Designed for global market, SIM900L is a quad-band GSM/GPRS module that works on frequencies GSM
850MHz, EGSM 900MHz, DCS 1800MHz and PCS 1900MHz. SIM900L features GPRS multi-slot class 10/
class 8 (optional) and supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4.
With a tiny configuration of 24*24*3mm, SIM900L can meet almost all the space requirements in user
applications, such as M2M, smart phone, PDA and other mobile devices.
SIM900L has 68 SMT pads, and provides all hardware interfaces between the module and customers’ boards.
Serial port and debug port can help user easily develop user’s applications.
Audio channel which includes a microphone input and a receiver output.
Programmable general purpose input and output.
The keypad and SPI display interfaces will give users the flexibility to develop customized applications.
SIM900L is designed with power saving technique so that the current consumption is as low as 1.0mA in sleep
mode.
SIM900L integrates TCP/IP protocol and extended TCP/IP AT commands which are very useful for data transfer
applications.
-1-
SIM900L Document
1.2 SIM900L Key Features
Table 1: SIM900L key features
Feature
Implementation
Power supply
3.4V ~ 4.5V
Power saving
Typical power consumption in sleep mode is 1.0mA ( BS-PA-MFRMS=9 )
SIM900L Quad-band: GSM 850, EGSM 900, DCS 1800, PCS 1900.
SIM900L can search the 4 frequency bands automatically. The frequency
bands also can be set by AT command “AT+CBAND”. For details, please
refer to document [1].
Compliant to GSM Phase 2/2+
Transmitting power
Class 4 (2W) at GSM 850 and EGSM 900
Class 1 (1W) at DCS 1800 and PCS 1900
GPRS connectivity
GPRS multi-slot class 10（default）
GPRS multi-slot class 8 (option)
Temperature range
Normal operation: -20°C ~ +60°C
Restricted operation: -40°C ~ -20°C and +60 °C ~ +85°C*
Storage temperature -45°C ~ +90°C
Data GPRS
GPRS data downlink transfer: max. 85.6 kbps
GPRS data uplink transfer: max. 42.8 kbps
Coding scheme: CS-1, CS-2, CS-3 and CS-4
Integrate the TCP/IP protocol.
Support Packet Broadcast Control Channel (PBCCH)
CSD
Support CSD transmission
USSD
Unstructured Supplementary Services Data (USSD) support
SMS
MT, MO, CB, Text and PDU mode
SMS storage: SIM card
FAX
Group 3 Class 1
SIM interface
Support SIM card: 1.8V, 3V
External antenna
Antenna pad
Audio features
Speech codec modes:
z Half Rate (ETS 06.20)
z Full Rate (ETS 06.10)
z Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80)
z Adaptive multi rate (AMR)
z Echo Cancellation
z Noise Suppression
Frequency bands
Serial port and
debug port
Serial port:
Full modem interface with status and control lines, unbalanced,
asynchronous.
1200bps to 115200bps.
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SIM900L Document
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.
Debug port:
Null modem interface GPS/DBG_TXD and GPS/DBG_RXD.
Can be used for debugging and upgrading firmware.
Phonebook management
Support phonebook types: SM, FD, LD, RC, ON, MC.
SIM application toolkit
GSM 11.14 Release 99
Real time clock
Support RTC
Physical characteristics
Size: 24*24*3mm
Weight: 3.4g
Firmware upgrade
Firmware upgradeable by debug port.
SIM900L does work at this temperature, but some radio frequency characteristics may deviate from the GSM
specification.
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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SIM900L Document
2. Package Information
GPIO12
GPIO11
STATUS
GND
GND
GND
GND
GND
RF_ANT
GND
GND
VBAT
VBAT
VBAT
GND
GND
NETLIGHT
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
2.1 Pin out Diagram
PWRKEY
51
GPIO10
NC
50
GPIO9/KBC1
DTR
49
GPIO8/KBC2
RI
48
GPIO7/KBC3
DCD
47
GPIO6/KBC4
NC
46
GND
CTS
45
GND
RTS
44
GPIO5/KBR0
43
GPIO4/KBR1
42
GPIO3/KBR2
SIM900L
SIM900
TOP
TOPVIEW
VIEW
30
31
32
33
34
SIM_DATA
SIM_CLK
SIM_RST
SIM_PRESENCE
GND
SIM_VDD
PWM1
29
35
28
17
GND
GND
DBG_RXD
PWM2
27
36
26
16
VRTC
SDA
NRESET
DBG_TXD
37
25
SCL
15
24
DISP_CS
VDD_EXT
ADC
GND
38
LINEIN_L
39
14
23
13
22
DISP_D/C
SPK_N
GPIO1/KBR4
LINEIN_R
DISP_DATA
21
GPIO2/KBR3
40
20
41
12
MIC_N
11
SPK_P
DISP_CLK
19
10
18
RXD
MIC_P
TXD
Figure 1: SIM900L pin out diagram (Top view)
2.2 Pin Description
Table 3: Pin description
Pin name
Pin number
I/O
Description
VBAT
55,56,57
Power supply
VRTC
26
I/O
Power supply for RTC
Comment
Power supply
-4-
It is recommended to
SIM900L Document
connect with a battery or
a capacitor (e.g. 4.7uF).
VDD_EXT
15
2.8V output power supply
GND
17,18,29,39,
45,46,53,54,
58,59,61,62,
63,64,65
Ground
PWRKEY should be pulled low at least
1 second and then released to power
on/down the module.
Differential audio input
Differential audio output
Line-in input
If it is unused, keep open.
Power on/down
PWRKEY
Pulled up internally.
Audio interfaces
MIC_P
19
MIC_N
20
SPK_P
21
SPK_N
22
LINEIN_R
23
LINEIN_L
24
If these pins are unused,
keep open.
Status
STATUS
66
Power on status
NETLIGHT
52
Network status
DISP _CLK
11
DISP_DATA
12
I/O
DISP _D/C
13
DISP _CS
14
37
If these pins are unused,
keep open.
LCD interface
Display interface
If these pins are unused,
keep open.
I C interface
SDA
SCL
38
I2C serial bus data
I/O
I C serial bus clock
I/O
GPIO5/keypad row 0
If these pins are unused,
keep open.
Keypad interface / GPIOs
GPIO5/KBR0
44
GPIO4/KBR1
43
GPIO4/keypad row 1
GPIO3/KBR2
42
GPIO3/keypad row 2
GPIO2/KBR3
41
GPIO2/keypad row 3
GPIO1/KBR4
40
GPIO1/keypad row 4
GPIO9/KBC1
50
GPIO9/keypad column 1
GPIO8/KBC2
49
GPIO8/keypad column 2
GPIO7/KBC3
48
GPIO7/keypad column 3
GPIO6/KBC4
47
GPIO6/keypad column 4
GPIO10
51
GPIO10
-5-
If these pins are unused,
keep open.
SIM900L Document
GPIO11
67
GPIO11
GPIO12
68
GPIO12
Serial port
This pin should be
pulled
up
to
VDD_EXT externally.
RXD
10
Receive data
TXD
Transmit data
RTS
Request to send
CTS
Clear to send
DCD
Data carrier detect
RI
Ring indicator
DTR
Data terminal ready
DBG_TXD
27
DBG_RXD
28
SIM_VDD
30
Voltage supply for SIM card. Support
1.8V or 3V SIM card
SIM_DATA
31
I/O
SIM data input/output
SIM_CLK
32
SIM clock
SIM_RST
33
SIM reset
SIM_PRESEN
CE
34
SIM card detection
If it is unused, keep open.
25
Input voltage range: 0V ~ 2.8V
If it is unused, keep open.
16
Reset input(Active low)
Recommend connecting
a 100nF capacitor.
If these pins are unused,
keep open.
Debug interface
For debugging and upgrading firmware
If these pins are unused,
keep open.
SIM interface
All signals of SIM
interface
should
be
protected against ESD
with a TVS diode array.
ADC
ADC
External reset
NRESET
Pulse width modulation( PWM )
PWM1
35
PWM
If these pins are unused,
keep open.
PWM2
36
PWM
60
I/O
Radio antenna connection
2,6
RF interface
RF_ANT
Impendence must
controlled to 50Ω.
be
Not connect
NC
These pins should be
kept open.
-6-
SIM900L Document
.3 Package Dimensions
BOTTOM VIEW
TOP VIEW
Figure 2: Dimensions of SIM900L（Unit: mm）
Figure 3: Recommended PCB footprint outline（Unit: mm）
-7-
SIM900L Document
2.4 Pictures
Figure 4: the top view of SIM900L
-8-
SIM900L Document
3. Detail Block Diagram
A[0:21]
32K
FLASH
D[0:16]
Application Interface (68PIN,SMT TYPE)
RF7161
PAM(PA+SWITCH)
UART
DBG
SAW
VBACKUP
Filter
GPIO
SPI
PNX4851
AUDIO
Intergrading
KEYPAD
DBB,ABB
and
VEXT
Transceiver
PWRKEY
26M
Antenna PAD
Figure 5: Block diagram of SIM900L
4. Electrical and Reliability Characteristics
4.1 Absolute Maximum Ratings
The absolute maximum ratings stated in following table are stress ratings under non-operating conditions. Stresses
beyond any of these limits will cause permanent damage to SIM900L.
Table 4: Absolute maximum ratings
Symbol
Parameter
Min
Typ
Max
Unit
VBAT
Power supply voltage
5.5
Input voltage
-0.3
3.1
Input current
10
mA
Output current
10
mA
VI
II
IO*
These parameters are for digital interface pins, such as keypad, GPIO, I C, UART, LCD, PWMs and DEBUG.
-9-
SIM900L Document
4.2 Recommended Operating Conditions
Table 5: Recommended operating conditions
Symbol
Parameter
Min
Typ
Max
Unit
VBAT
Power supply voltage
3.2
4.0
4.8
TOPER
Operating temperature
-40
+25
+85
℃
TSTG
Storage temperature
-45
+90
℃
4.3 Digital Interface Characteristics
Table 6: Digital interface characteristics
Symbol
Parameter
Min
Typ
Max
Unit
IIH
High-level input current
-10
10
uA
IIL
Low-level input current
-10
10
uA
VIH
High-level input voltage
2.4
VIL
Low-level input voltage
0.4
VOH
High-level output voltage
2.7
VOL
Low-level output voltage
0.1
* These parameters are for digital interface pins, such as keypad, GPIO, I C, UART, LCD, PWMs and DEBUG.
4.4 SIM Card Interface Characteristics
Table 7: SIM card interface characteristics
Symbol
Parameter
Min
Typ
Max
Unit
IIH
High-level input current
-10
10
uA
IIL
Low-level input current
-10
10
uA
VIH
High-level input voltage
1.4
2.4
VIL
Low-level input voltage
0.4
2.4
VOH
High-level output voltage
VOL
Low-level output voltage
1.7
2.7
0.1
0.1
4.5 VDD_EXT Characteristics
- 10 -
SIM900L Document
Table 8: VDD_EXT characteristics
Symbol
Parameter
Min
Typ
Max
Unit
VO
Output voltage
2.70
2.80
2.95
IO
Output current
10
mA
Min
Typ
Max
Unit
2.75
2.9
3.00
1.65
1.80
1.95
10
mA
4.6 SIM_VDD Characteristics
Table 9: SIM_VDD characteristics
Symbol
Parameter
VO
Output voltage
IO
Output current
4.7 VRTC Characteristics
Table 10: VRTC characteristics
Symbol
Parameter
Min
Typ
Max
Unit
VRTC-IN
VRTC input voltage
2.00
3.00
3.15
IRTC-IN
VRTC input current
uA
VRTC-OUT
VRTC output voltage
3.00
IRTC-OUT
VRTC output current
10
uA
4.8 Current Consumption (VBAT = 3.8V, GPS engine is powered down)
Table 11: GSM current consumption
Symbol
Parameter
Conditions
Value
Unit
IVRTC
VRTC current
VBAT disconnects. Backup battery is 3 V
uA
IVBAT
VBAT current
Power down mode
30
uA
Sleep mode
BS-PA-MFRMS=9
1.0
BS-PA-MFRMS=5
1.2
BS-PA-MFRMS=2
1.5
mA
GSM 850
Idle mode
EGSM 900
DCS 1800
22
mA
250
mA
PCS 1900
Voice call
GSM 850
- 11 -
PCL=5
SIM900L Document
EGSM 900
DCS 1800
PCS 1900
Data mode
GPRS(1Rx,1Tx)
Data mode
GPRS(4Rx,1Tx)
Data mode
GPRS(3Rx,2Tx)
IVBAT-peak
Peak current
GSM 850
EGSM 900
DCS 1800
PCS 1900
GSM 850
EGSM 900
DCS 1800
PCS 1900
GSM 850
EGSM 900
DCS 1800
PCS 1900
During Tx burst
PCL=12
110
PCL=19
76
PCL=0
168
PCL=7
89
PCL=15
76
PCL=5
240
PCL=12
110
PCL=19
83
PCL=0
170
PCL=7
95
PCL=15
80
PCL=5
270
PCL=12
150
PCL=19
120
PCL=0
205
PCL=7
130
PCL=15
115
PCL=5
440
PCL=12
185
PCL=19
130
PCL=0
300
PCL=7
155
PCL=15
122
mA
mA
mA
mA
mA
mA
4.9 Electro-Static Discharge
SIM900L is an ESD sensitive component, so more attention should be paid to the procedure of handling and
packaging. The ESD test results are shown in the following table.
Table 12: The ESD characteristics (Temperature: 25℃, Humidity: 45 %)
Pin
Contact discharge
Air discharge
VBAT
±5KV
±10KV
GND
±4KV
±10KV
RXD, TXD
±3KV
±6KV
Antenna port
±5KV
±10KV
SPKP/ SPKN
MICP/ MICN
±2KV
±8KV
PWRKEY
±1KV
±8KV
- 12 -
SIM900L Document
4.10 Radio Characteristics
4.10.1 Module RF Output Power
The following table shows the module conducted output power, it is followed by the 3GPP TS 05.05 technical
specification requirement.
Table 13: SIM900L GSM 900 and GSM 850 conducted RF output power
GSM 900 and EGSM 850
PCL
Tolerance (dB) for conditions
Nominal output power (dBm)
Normal
Extreme
0-2
39
±2
±2.5
37
±3
±4
35
±3
±4
33
±3
±4
31
±3
±4
29
±3
±4
27
±3
±4
25
±3
±4
10
23
±3
±4
11
21
±3
±4
12
19
±3
±4
13
17
±3
±4
14
15
±3
±4
15
13
±3
±4
16
11
±5
±6
17
±5
±6
18
±5
±6
19-31
±5
±6
Table 14: SIM900L DCS 1800 and PCS 1900 conducted RF output power
DCS 1800 and PCS 1900
PCL
Tolerance (dB) for conditions
Nominal output power (dBm)
Normal
Extreme
29
36
±2
±2.5
30
34
±3
±4
31
32
±3
±4
30
±3
±4
28
±3
±4
- 13 -
SIM900L Document
26
±3
±4
24
±3
±4
22
±3
±4
20
±3
±4
18
±3
±4
16
±3
±4
14
±3
±4
12
±4
±5
10
10
±4
±5
11
±4
±5
12
±4
±5
13
±4
±5
14
±5
±6
15-28
±5
±6
For the module’s output power, the following is should be noted:
At GSM900 and GSM850 band, the module is a class 4 device, so the module’s output power should not exceed
33dBm, and at the maximum power level, the output power tolerance should not exceed +/-2dB under normal
condition and +/-2.5dB under extreme condition.
At DCS1800 and PCS1900 band, the module is a class 1 device, so the module’s output power should not exceed
30dBm, and at the maximum power level, the output power tolerance should not exceed +/-2dB under normal
condition and +/-2.5dB under extreme condition.
4.10.2 Module RF Receive Sensitivity
The following table shows the module’s conducted receive sensitivity, it is tested under static condition.
Table 15: SIM900L conducted RF receive sensitivity
Frequency
Receive sensitivity（Typical）
Receive sensitivity(Max)
GSM850
-109dBm
-107dBm
EGSM900
-109dBm
-107dBm
DCS1800
-109dBm
-107dBm
PCS1900
-109dBm
-107dBm
4.10.3 Module Operating Frequencies
The following table shows the module’s operating frequency range; it is followed by the 3GPP TS 05.05 technical
specification requirement.
Table 16: SIM900L operating frequencies
- 14 -
SIM900L Document
Frequency
Receive
Transmit
GSM850
869 ~ 894MHz
824 ~ 849 MHz
EGSM900
925 ~ 960MHz
880 ~ 915MHz
DCS1800
1805 ~ 1880MHz
1710 ~ 1785MHz
PCS1900
1930 ~ 1990MHz
1850 ~ 1910MHz
- 15 -

---

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Format                          : application/pdf
Title                           : Microsoft Word - SIM900L_User Manual_Rev 3.doc
Creator                         : spring
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