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.
z Serial port and debug port can help user easily develop user’s applications.
z Audio channel which includes a microphone input and a receiver output.
z Programmable general purpose input and output.
z 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.
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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 )
z SIM900L Quad-band: GSM 850, EGSM 900, DCS 1800, PCS 1900.
SIM900L can search the 4 frequency bands automatically. The frequency
Frequency bands
bands also can be set by AT command “AT+CBAND”. For details, please
refer to document [1].
z Compliant to GSM Phase 2/2+
Transmitting power
GPRS connectivity
z Class 4 (2W) at GSM 850 and EGSM 900
z Class 1 (1W) at DCS 1800 and PCS 1900
z GPRS multi-slot class 10（default）
z GPRS multi-slot class 8 (option)
z Normal operation: -20°C ~ +60°C
Temperature range
z Restricted operation: -40°C ~ -20°C and +60 °C ~ +85°C*
z Storage temperature -45°C ~ +90°C
z GPRS data downlink transfer: max. 85.6 kbps
z GPRS data uplink transfer: max. 42.8 kbps
Data GPRS
z Coding scheme: CS-1, CS-2, CS-3 and CS-4
z Integrate the TCP/IP protocol.
z Support Packet Broadcast Control Channel (PBCCH)
CSD
USSD
SMS
z Support CSD transmission
z Unstructured Supplementary Services Data (USSD) support
z MT, MO, CB, Text and PDU mode
z SMS storage: SIM card
FAX Group 3 Class 1
SIM interface Support SIM card: 1.8V, 3V
External antenna Antenna pad
Speech codec modes:
z Half Rate (ETS 06.20)
z Full Rate (ETS 06.10)
Audio features
z Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80)
z Adaptive multi rate (AMR)
z Echo Cancellation
z Noise Suppression
Serial port:
Serial port and
debug port
z Full modem interface with status and control lines, unbalanced,
asynchronous.
z 1200bps to 115200bps.
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SIM900L Document
z Can be used for AT commands or data stream.
z Support RTS/CTS hardware handshake and software ON/OFF flow control.
z Multiplex ability according to GSM 07.10 Multiplexer Protocol.
z Autobauding supports baud rate from 1200 bps to 57600bps.
Debug port:
z Null modem interface GPS/DBG_TXD and GPS/DBG_RXD.
z 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
2.1 Pin out Diagram
PWRKEY GPIO10
NC GPIO9/KBC1
DTR GPIO8/KBC2
RI GPIO7/KBC3
DCD GPIO6/KBC4
NC GND
CTS GND
RTS GPIO5/KBR0
TXD GPIO4/KBR1
RXD GPIO3/KBR2
DISP_CLK
DISP_DATA
DISP_D/C
DISP_CS
VDD_EX T
NRESET PWM2
GND PW M1
GPIO12
GPIO11
STATUS
GND
GND
GND
GND
GND
RF _A NT
GND
GND
VBAT
VBAT
VBAT
GND
GND
NETLIGHT
68
676665
1 51
2 50
3 49
4 48
5 47
6 46
7 45
8
9 43
10 42
11 41
12 40
13 39
14 38
15 37
16 36
17 35
64
636261
SIM900L
SIM900
TOP VIEW
TOP VIEW
58
57
60
59
565554
52
53
44
GPIO2/KBR3
GPIO1/KBR4
GND
SCL
SDA
18
1920212223242526
GND
MIC_P
MIC_N
SPK_P
SPK_N
LINEIN_L
LINEIN_R
27282934303132
ADC
VRTC
DBG_TXD
DBG_RXD
33
GND
SIM_CLK
SIM_VDD
SIM_RST
SIM_DAT A
SIM_PRESENCE
Figure 1: SIM900L pin out diagram (Top view)
2.2 Pin Description
Table 3: Pin description
Pin name Pin number I/O Description Comment
Power supply
VBAT 55,56,57 I Power supply
VRTC 26 I/O Power supply for RTC It is recommended to
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SIM900L Document
connect with a battery or
a capacitor (e.g. 4.7uF).
VDD_EXT 15 O 2.8V output power supply If it is unused, keep open.
17,18,29,39,
GND
45,46,53,54,
58,59,61,62,
Ground
63,64,65
Power on/down
PWRKEY should be pulled low at least
PWRKEY 1 I
1 second and then released to power
Pulled up internally.
on/down the module.
Audio interfaces
MIC_P 19
I Differential audio input
MIC_N 20
SPK_P 21
O Differential audio output
SPK_N 22
LINEIN_R 23
I Line-in input
LINEIN_L 24
Status
STATUS 66 O Power on status
NETLIGHT 52 O Network status
LCD interface
DISP _CLK 11 O
DISP_DATA 12 I/O
Display interface
DISP _D/C 13 O
DISP _CS 14 O
I2C interface
SDA 37 O
SCL 38 I/O
I2C serial bus data
I2C serial bus clock
If these pins are unused,
keep open.
If these pins are unused,
keep open.
If these pins are unused,
keep open.
If these pins are unused,
keep open.
Keypad interface / GPIOs
GPIO5/KBR0 44 GPIO5/keypad row 0
I/O
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
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If these pins are unused,
keep open.
SIM900L Document
GPIO11 67 GPIO11
GPIO12 68 GPIO12
Serial port
This pin should be
RXD 10 I Receive data
pulled up to
VDD_EXT externally.
TXD 9 O Transmit data
RTS 8 I Request to send
CTS 7 O Clear to send
DCD 5 O Data carrier detect
If these pins are unused,
keep open.
RI 4 O Ring indicator
DTR 3 I Data terminal ready
Debug interface
DBG_TXD 27 O
DBG_RXD 28 I
For debugging and upgrading firmware
If these pins are unused,
keep open.
SIM interface
SIM_VDD 30 O
SIM_DATA 31 I/O SIM data input/output
SIM_CLK 32 O SIM clock
Voltage supply for SIM card. Support
1.8V or 3V SIM card
All signals of SIM
interface should be
protected against ESD
with a TVS diode array.
SIM_RST 33 O SIM reset
SIM_PRESEN
CE
34 I SIM card detection If it is unused, keep open.
ADC
ADC 25 I Input voltage range: 0V ~ 2.8V If it is unused, keep open.
External reset
NRESET 16 I Reset input(Active low)
Pulse width modulation( PWM )
PWM1 35 O PWM
PWM2 36 O PWM
RF interface
RF_ANT 60 I/O Radio antenna connection
Not connect
NC 2,6 -
- 6 -
Recommend connecting
a 100nF capacitor.
If these pins are unused,
keep open.
Impendence must be
controlled to 50Ω.
These pins should be
kept open.
SIM900L Document
.3 Package Dimensions
TOP VIE W
Figure 2: Dimensions of SIM900L（Unit: mm）
BOTTOM VIEW
Figure 3: Recommended PCB footprint outline（Unit: mm）
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SIM900L Document
2.4 Pictures
Figure 4: the top view of SIM900L
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SIM900L Document
K
]
]
3. Detail Block Diagram
PAM(PA+SWITCH)
RF7161
SAW
Filter
32
26M
PNX4851
Intergrading
DBB,ABB
and
Transceiver
A[0:21
D[0:16
DBG
VBACKUP
GPIO
SPI
AUDIO
KEYPAD
VEXT
PWRKEY
FLASH
UART
Application Interface (68PIN,SMT TYPE)
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 V
*
V
Input voltage -0.3 - 3.1 V
I
*
I
Input current - - 10 mA
I
*
I
Output current - - 10 mA
O
*
These parameters are for digital interface pins, such as keypad, GPIO, I2C, UART, LCD, PWMs and DEBUG.
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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 V
T
Operating temperature -40 +25 +85 ℃
OPER
T
Storage temperature -45 +90 ℃
STG
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 - - V
VIL Low-level input voltage - - 0.4 V
VOH High-level output voltage 2.7 - - V
VOL Low-level output voltage - - 0.1 V
* These parameters are for digital interface pins, such as keypad, GPIO, I2C, 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
VIL Low-level input voltage
1.4 - - V
2.4 - - V
- - 0.4 V
2.4 V
VOH High-level output voltage
VOL Low-level output voltage
4.5 VDD_EXT Characteristics
1.7 - - V
2.7 - - V
- - 0.1 V
- - 0.1 V
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SIM900L Document
Table 8: VDD_EXT characteristics
Symbol Parameter Min Typ Max Unit
VO Output voltage 2.70 2.80 2.95 V
IO Output current - - 10 mA
4.6 SIM_VDD Characteristics
Table 9: SIM_VDD characteristics
Symbol Parameter Min Typ Max Unit
VO Output voltage
2.75 2.9 3.00
V
1.65 1.80 1.95
IO Output current - - 10 mA
4.7 VRTC Characteristics
Table 10: VRTC characteristics
Symbol Parameter Min Typ Max Unit
V
I
V
I
VRTC input voltage 2.00 3.00 3.15 V
RTC-IN
VRTC input current - 2 - uA
RTC-IN
RTC-OUT
RTC-OUT
VRTC output voltage - 3.00 - V
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
I
VRTC current VBAT disconnects. Backup battery is 3 V 2 uA
VRTC
I
VBAT current
VBAT
Power down mode 30 uA
BS-PA-MFRMS=9 1.0
Sleep mode
BS-PA-MFRMS=5 1.2
mA
BS-PA-MFRMS=2 1.5
GSM 850
Idle mode
EGSM 900
22 mA
DCS 1800
PCS 1900
Voice call GSM 850 PCL=5 250 mA
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SIM900L Document
PCL=12 110 EGSM 900
PCL=19 76
Data mode
GPRS(1Rx,1Tx)
Data mode
GPRS(4Rx,1Tx)
Data mode
GPRS(3Rx,2Tx)
DCS 1800
PCS 1900
GSM 850
EGSM 900
DCS 1800
PCS 1900
GSM 850
EGSM 900
DCS 1800
PCS 1900
GSM 850
EGSM 900
DCS 1800
PCS 1900
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
I
VBAT-peak
Peak current During Tx burst 2 A
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
PWRKEY ±1KV ±8KV
±2KV ±8KV
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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 Nominal output power (dBm)
Tolerance (dB) for conditions
Normal Extreme
0-2 39 ±2 ±2.5
3 37 ±3 ±4
4 35 ±3 ±4
5 33 ±3 ±4
6 31 ±3 ±4
7 29 ±3 ±4
8 27 ±3 ±4
9 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 9 ±5 ±6
18 7 ±5 ±6
19-31 5 ±5 ±6
Table 14: SIM900L DCS 1800 and PCS 1900 conducted RF output power
DCS 1800 and PCS 1900
PCL Nominal output power (dBm)
Tolerance (dB) for conditions
Normal Extreme
29 36 ±2 ±2.5
30 34 ±3 ±4
31 32 ±3 ±4
0 30 ±3 ±4
1 28 ±3 ±4
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SIM900L Document
2 26 ±3 ±4
3 24 ±3 ±4
4 22 ±3 ±4
5 20 ±3 ±4
6 18 ±3 ±4
7 16 ±3 ±4
8 14 ±3 ±4
9 12 ±4 ±5
10 10 ±4 ±5
11 8 ±4 ±5
12 6 ±4 ±5
13 4 ±4 ±5
14 2 ±5 ±6
15-28 0 ±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
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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
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