SIM5218E Hardware Design
SIM5218E_ Hardware Design_V1.06
2012.09.21
17
USIM_CLK
O
SIM Clock
USIM_RESET
O
SIM Reset
IIC interface
PIN NAME
I/O
DESCRIPTION
DC CHARACTERISTICS
IIC_SDA
I/O
I2C data, if not in use, left open. It
has been pulled up with a 2.2kR
resistor to 2.6V in module. So there is
no need to pull up it in user’s
application circuit.
IIC_SCL
O
I2C clock output, if not in use, left
open. It has been pulled up with a
2.2kR resistor to 2.6V in module. So
there is no need to pull up it in user’s
application circuit.
Other interface
Reset
I
System reset in, active low.
GPIO0/PCM_DIN
I
General Input PIN with interrupt. If
not in use, left open. It also can be
multiplexed as the PCM_DIN pin.
GPIO1
O
Status Indicating LED Control.
GPIO2/PCM_SYNC
I
General Input PIN. If not in use, left
open. It also can be multiplexed as
the PCM_SYNC pin.
GPIO3/PCM_CLK
O
General Output PIN. If not in use, left
open. It also can be multiplexed as
the PCM_CLK pin.
GPIO4
I
RF Control: Flight Modem switch
GPIO5/PCM_DOUT
O
General Output PIN. If not in use, left
open. It also can be multiplexed as
the PCM_DOUT pin.
VIHmin=0.7*VDD_EXT
*
VIHmax= 0.3
VOLmin=GND
VOLmax=0.2V
VOHmin= VDD_EXT-0.2
VOHmax= VDD_EXT
*Note: module internal reference supply power: VDD_Ext=2.6V
3.2 Operating modes
The following table summarizes the various operating modes, each operating modes will be
referred to in the following chapters.
Table 6
：
Overview of operating modes
Mode
Function
