SIM802 Hardware Design
SPI
MOSI
I/O
GPIO
Master out slave in of
SPI
NSS
I/O
GPIO
Slave select input of SPI
SCK
I/O
GPIO
I
2
C clock
SDA
I/O
GPIO
I
2
C data
C2D
Reserve
NRST
Reserve
The reference circuit for I
2
C shown as following figure:
GSM
SRD
SIM802
MODULE
APPLICATION
SDA
SCL
SDA
SCL
R1
R2
3.3V
Figure 33: I
2
C application of the SRD interface
In the application I
2
C SDA and I
2
C SCL lines need to be connected to a positive supply voltage
via a pull-up resistor.
The reference circuit for SPI shown as following figure:
GSM
SIM802
MODULE
APPLICATION
SPI
MISO
SCLK
SRD
MOSI
NSS
Figure 34: SPI application of the SRD interface
Note: This function is not supported in the default firmware. For more information, please
contact SIMCom.
SIM802_HD_V2.01
12.01.2010
58
