SIM900D Hardware Design
4.3 Module Operating Frequencies
Table26: SIM900D 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
5 Electrical, Reliability and Radio Characteristics
5.1 Absolute Maximum Ratings
The absolute maximum ratings stated in Table 27 are stress ratings under non-operating conditions. Stresses
beyond any of these limits will cause permanent damage to SIM900D.
Table27: Absolute maximum ratings
Parameter
Min
Max
Unit
VBAT
-
5.5
V
Peak current of power supply
0
3.0
A
Voltage at digit pins*
-0.3
3.1
V
I
I
*
-
10
mA
I
O
*
-
10
mA
*For digital interface pins, such as GPIO, UART, LCD and PWM.
5.2 Operating Temperatures
The operating temperature is listed in following table:
Table28: SIM900D operating temperature
Parameter
Min
Typ
Max
Unit
Ambient temperature
-30
+25
+80
℃
Restricted operation*
-40 to -30
+80 to+ 85
℃
Storage temperature
-45
+90
℃
* The SIM900D does work, but deviations from the GSM specification may occur.
SIM900D_HD_V1.02
09.04.2010
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