SIM900 Hardware Design
4.4 Module Operating Frequencies
Table 25: SIM900A operating frequencies
Frequency
EGSM900
DCS1800
Receive
925 ~ 960MHz
1805 ~ 1880MHz
Transmit
880 ~ 915MHz
1710 ~ 1785MHz
5 Electrical, Reliability and Radio Characteristics
5.1 Absolute Maximum Ratings
The absolute maximum ratings stated in Table 28 are stress ratings under non-operating conditions. Stresses
beyond any of these limits will cause permanent damage to SIM900A.
Table 26: 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
II*
-
10
mA
IO*
-
10
mA
*For digital interface pins, such as keypad, GPIO, I2C, UART, LCD and PWMs.
5.2 Operating Temperatures
The operating temperature is listed in following table:
Table 27: SIM900A operating temperature
Parameter
Ambient temperature
Restricted operation*
Storage temperature
Min
Typ
-30
25
-40 to -30
-45
Max
Unit
80
℃
80 to 85
℃
90
℃
* The SIM900A does work, but deviations from the GSM specification may occur.
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26.12.2009