Figure 34: Spi Application Of The Srd Interface - SimCom SIM802 HD Manual

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

Figure 34: SPI application of the SRD interface

APPLICATION
3.3V
R2
R1
APPLICATION
58
SDA
SCL
SPI
12.01.2010