SIM900 View Datasheet(PDF) - Unspecified
Part Name
Description
Manufacturer
SIM900 Datasheet PDF : 58 Pages
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SIM900 Hardware Design
z Automatically generates Start repeated pattern when performing read operations
z Automatically observes and generates the acknowledge bit
z Implements a hardware assisted I2C-bus protocol
Table 22: Pin define of the I2C Bus
Pin Name
Pin Number
Function
SCL
38
I2C Bus Clock
SDA
37
I2C Bus Data
Note: This function is not supported in the default firmware. There must be customized firmware if you want.
Please contact SIMCom for more details.
4 Antenna Interface
SIM900A provides RF antenna interface. And customer’s antenna should be located in the customer’s main board
and connect to module’s antenna pad through microstrip line or other type RF trace which impendence must be
controlled in 50Ω. To help you to ground the antenna, SIM900A comes with a grounding plane located close to
the antenna pad. The Pin 60 is the RF antenna pad.
SIM900A material properties:
SIM900A PCB Material: FR4
Antenna pad: Gold plated pad
4.2 Module RF Output Power
Table 23: SIM900A conducted RF output power
Frequency
EGSM900
DCS1800
Max
33dBm ±2db
30dBm ±2db
Min
5dBm±5db
0dBm±5db
4.3 Module RF Receive Sensitivity
Table 24: SIM900A conducted RF receive sensitivity
Frequency
EGSM900
DCS1800
Receive sensitivity
< -106dBm
< -106dBm
SIM900_HD_V1.01
48
26.12.2009
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