SIM908 Document
SIM908 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.
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-2011091310088” or “Contains FCC ID:
UDV-2011091310088”.
This equipment has a GSM antenna and a GPS antenna, the GPS antenna peak gain is 5 dBi and modulation
type is BPSK; 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 24.22 cm away from the body of the user,the user must keeping at least 24.22cm
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.
For label requirement
1. SIM908 Description
1.1 Summarize
Designed for global market, SIM908 is integrated with a high performance GSM/GPRS engine and a GPS engine.
The GSM/GPRS engine is a quad-band GSM/GPRS module that works on frequencies GSM 850MHz, EGSM
900MHz, DCS 1800MHz and PCS 1900MHz. SIM908 features GPRS multi-slot class 10/ class 8 (optional) and
supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4. The GPS solution offers best- in-class
acquisition and tracing sensitivity, Time-To-First-Fix (TTFF) and accuracy.
With a tiny configuration of 30*30*3.2mm, SIM908 can meet almost all the space requirements in user
applications, such as M2M, smart phone, PDA, tracker and other mobile devices.
SIM908 has 80 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 GPS Serial port.
z Two audio channels include two audio inputs and two audio outputs. These can be easily configured by AT
command.
z Charging interface.
z Programmable general purpose input and output.
z The keypad and SPI display interfaces will give users the flexibility to develop customized applications.
z RF pad and connector interface.
SIM908 is designed with power saving technique so that the current consumption is as low as 1.0mA in sleep
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SIM908 Document
mode (GPS engine is powered down).
SIM908 integrates TCP/IP protocol and extended TCP/IP AT commands which are very useful for data transfer
applications.
1.2 SIM908 Key Features
Table 1: SIM908 GSM/GPRS engine 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, GPS
engine is powered down )
Charging Supports charging control for Li-Ion battery
z SIM908 Quad-band: GSM 850, EGSM 900, DCS 1800, PCS 1900. SIM908
can search the 4 frequency bands automatically. The frequency bands also
Frequency bands
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 +80 °C ~ +60°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)
Audio features
z Full Rate (ETS 06.10)
z Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80)
z Adaptive multi rate (AMR)
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SIM908 Document
z Echo Cancellation
z Noise Suppression
Serial port:
z Full modem interface with status and control lines, unbalanced,
asynchronous.
z 1200bps to 115200bps.
Serial port and
debug port
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: 30*30*3.2mm
Weight: 5.2g
Firmware upgrade Firmware upgradeable by debug port.
*
SIM908 does work at this temperature, but some radio frequency characteristics may deviate from the GSM
specification.
Table 2: GPS engine Performance
Performance
Parameter Description
Min Typ Max Unit
Horizontal Position
Accuracy
(a)
Velocity Accuracy
Autonomous 2.5 m
Speed - 0.01 - m/s
(b)
Heading - 0.01 - °
Hot start - 1 - s
Time To First Fix
(c)
Cold start - 30 - s
Sensitivity
Receiver
Autonomous
acquisition
-143 dBm
Tracking -160 dBm
Channels 42
Update rate 1 Hz
Altitude 18288 m
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SIM908 Document
Velocity 1850 km/h
Tracking L1,
CA Code
Protocol support
NMEA,OSP
Continuous
76 mA
tracking
Power consumption
(d)
acquisition
Power down
77
0.03 uA
current
Table 3: 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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SIM908 Document
Y
A
A
C
C
C
C
A
C
8
3
58
2
5
2. Package Information
2.1 Pin out Diagram
GND GND
GND GSM-ANT
PWRKE
NC GND
GND I2C-SD
DISP-CLK I2C-SCL
DISP-DAT
DIS P-D/C N
DISP-CS STATUS
GND NETLIGHT
NC
NC
NC
GND
GPS/DBG-TXD
GPS/DBG-RXD N
SIM-DAT
SIM-RST GND
SIM-CLK VRT
SIM-VDD GND
GND
GPS-ANT
GND
GND
GPS-VANT-IN
GPS-VANT-OUT
VCHG
TEMP-BAT
DTR
TXD
DCDRIRXD
807978
1 60
4 57
5 56
6 55
7 54
8 53
9 52
10 51
11 50
12 49
13 48
14 47
15 46
16 45
17 44
18
19
20
212223
767574
77
2526272
24
727170
73
SIM908
TOP VIEW
293031
69
32
CTS
686766
333435
RTS
GND
GND
VBAT
VBAT
GND
64
6
636261
37
36
383940
59
43
42
41
GND
N
PWM3
PWM2
PWM1
ADC
N
VDD-EXD
NC
NC
MIC1P
SPK1N
MIC1N
SPK1P
MIC2P
SPK2N
MIC2N
SPK2P
GPIO1/KBR0
GPIO2/KBR1
GPIO3/KBR2
GPIO4/KBC0
GPIO5/KBC1
NC
NC
GND
GPIO6/KBC2
GND
Figure 1: SIM908 pin out diagram (Top view)
2.2 Pin Description
Table 4: Pin description
Pin name Pin number I/O Description Comment
Power supply
VBAT 62, 63 I Power supply 3.2V ~ 4.8V
It is recommended to
VRTC 42 I/O Power supply for RTC
connect with a battery or
a capacitor (e.g. 4.7uF).
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SIM908 Document
VDD-EXT 44 O 2.8V output power supply If it is unused, keep open.
GPS-VANT-OUT 75 O 2.8V output for GPS active antenna If it is unused, keep open.
GPS-VANT-IN 76 I GPS active antenna power supply If it is unused, keep open.
1, 2, 5, 10, 14, 37,
GND
40, 41, 43, 57, 58,
60, 61, 64, 65, 77,
Ground
78, 80
Charge interface
VCHG 74 I Charger input
TEMP_BAT 73 I Battery temperature sensor
Power on/down
PWRKEY should be pulled low at
PWRKEY 3 I
least 1 second and then released to
Pulled up internally.
power on/down the module.
Audio interfaces
MIC1P 23
I Differential audio input
MIC1N 24
SPK1P 22
O Differential audio output
SPK1N 21
MIC2P 27
I Differential audio input
MIC2N 28
SPK2N 25
O Differential audio output
SPK2P 26
Status
STATUS 52 O Power on status
NETLIGHT 51 O Network status
LCD interface
DISP -CLK 6 O
DISP-DATA 7 I/O
Display interface
DISP -D/C 8 O
DISP -CS 9 O
If these pins are unused,
keep open.
If these pins are unused,
keep open.
If these pins are unused,
keep open.
I2C interface
I2C-SDA 56 O
I2C-SCL 55 I/O
I2C serial bus data
I2C serial bus clock
Keypad interface / GPIOs
GPIO1/KBR0 31 GPIO1/keypad row 0
I/O
GPIO2/KBR1 32 GPIO2/keypad row 1
GPIO3/KBR2 33
GPIO3/keypad row 2
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If these pins are unused,
keep open.
If these pins are unused,
keep open.
SIM908 Document
GPIO4/KBC0 34 GPIO4/keypad column 0
GPIO5/KBC1 35 GPIO5/keypad column 1
GPIO6/KBC2 36 GPIO6/keypad column 3
Serial port
RXD 68 I Receive data
TXD 71 O Transmit data
RTS 66 O Request to send
CTS 67 I Clear to send
DCD 70 O Data carrier detect
RI 69 O Ring indicator
If only TXD and RXD
are used, it is suggested
to pull down DTR, and
others pins can be kept
open.
DTR 72 I Data terminal ready
GPS/Debug interface
GPS/DBG-TXD 15 O
GPS/DBG-RXD 16 I
For GPS NMEA information output ,
debugging and upgrading firmware
If these pins are unused,
keep open.
SIM interface
SIM-VDD 20 O
SIM-DATA 17 I/O SIM data input/output
SIM-CLK 19 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 18 O SIM reset
ADC
ADC 47 I Input voltage range: 0V ~ 2.8V If it is unused, keep open.
Pulse width modulation( PWM )
PWM1 48 O PWM
PWM2 49 O PWM
PWM3 50 O PWM
GSM/GPS RF interface
GSM-ANT 59 I/O GSM radio antenna connection
GPS-ANT 79 I GPS radio antenna connection
Not connect
NC
4,11,12,13,29,30,
38,39,45,46,53,54
-
If these pins are unused,
keep open.
Impendence must be
controlled to 50Ω.
Impendence must be
controlled to 50Ω.
These pins should be
kept open.
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SIM908 Document
2.3 Package Dimensions
Figure 2: Dimensions of SIM908（Unit: mm）
Figure 3: Recommended PCB footprint outline（Unit: mm）
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SIM908 Document
2.4 Pictures
GPS
Antenna connector
GPS PAD
Figure 4: The RF interface of module
GSM
Antenna connector
GSM PAD
3. Detail Block Diagram
Figure 5: Block diagram of SIM908
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SIM908 Document
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 SIM908.
Table 5: 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.
4.2 Recommended Operating Conditions
Table 6: 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 7: 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.
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SIM908 Document
4.4 SIM Card Interface Characteristics
Table 8: 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 - - V
2.4 - - V
VIL Low-level input voltage
- - 0.4 V
2.4 V
VOH High-level output voltage
1.7 - - V
2.7 - - V
VOL Low-level output voltage
- - 0.1 V
- - 0.1 V
4.5 VDD_EXT Characteristics
Table 9: 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 10: 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 11: VRTC characteristics
Symbol Parameter Min Typ Max Unit
V
VRTC input voltage 2.00 3.00 3.15 V
RTC-IN
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SIM908 Document
I
VRTC input current - 2 - uA
RTC-IN
V
RTC-OUT
I
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 12: 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 50 uA
BS-PA-MFRMS=9 1.2
Sleep mode
BS-PA-MFRMS=5 1.5
mA
BS-PA-MFRMS=2 1.7
GSM 850
Idle mode
Voice call
Data mode
GPRS(1Rx,1Tx)
Data mode
GPRS(4Rx,1Tx)
EGSM 900
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
21 mA
PCL=5 240
PCL=12 110
PCL=19 76
PCL=0 180
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=0 210
PCL=7 130
PCL=15 115
mA
mA
mA
mA
mA
Data mode
GPRS(3Rx,2Tx)
GSM 850
EGSM 900
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PCL=5 435
PCL=12 185
PCL=19 130
mA
SIM908 Document
DCS 1800
PCS 1900
PCL=7 155
mA
PCL=15 122
PCL=0 320
I
VBAT-peak
Peak current During Tx burst 2 A
4.9 Electro-Static Discharge
SIM908 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
13: 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
±3KV ±8KV
PWRKEY ±3KV ±8KV
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 14: SIM908 GSM 900 and GSM 850 conducted RF output power
GSM 900 and EGSM 850
PCL Nominal output power (dBm)
0-2 39 ±2 ±2.5
3 37 ±3 ±4
Tolerance (dB) for conditions
Normal Extreme
4 35 ±3 ±4
5 33 ±3 ±4
6 31 ±3 ±4
7 29 ±3 ±4
8 27 ±3 ±4
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SIM908 Document
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 15: SIM908 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
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.
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SIM908 Document
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
16: SIM908 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
17: SIM908 operating frequencies
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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