SIM5218E Hardware Design
the following table:
Pin
SIM5218E_ Hardware Design_V1.06
2012.09.21
41
Table 20: GPIO Pins of SIM5218E
GPIO0 is used for interrupt pin, default triggering mechanism is level trigger, and low level
will trigger interrupt. After interrupt, SIM5218E would send out Alarm information to host
CPU. Please Refer to “AT Command Manual”.
GPIO1 is used to control Status LED, the LED driving circuit of GPIO1 is shown below., and
status table is Table 23.
Figure 23: status LED circuit
Notes: 300R Resistor’s value depends on LED.
And status indicating table is as follow.
Name
Direction
Function
65
GPIO0
Input,
Input Port with interrupt/PCM_DIN
interrupt
Use AT Command to set interrupt triggering mechanism & polarity .
10
GPIO1
Output
used as status LED driver
30
GPIO2
Input
General Purpose Input Port without interrupt/PCM_SYNC
31
GPIO3
Output
General Purpose Output Port (default value: Low Level)/PCM_CLK
32
GPIO4
Input
RF Control Interrupt
：
Flight Mode Switch
33
GPIO5
Output
General Purpose Output Port (default value: Low Level)/PCM_DOUT
