I2C Interface - SimCom SIM7200 Hardware Manual

capacitance of these signals when layout, high capacitance will increase signal rise time. To optimize
the signal rise time, the USIM_DATA has been pulled up to USIM_VDD with 10K resistor inside the
SIM7200, customer do not need to add pull up;.

Keep good connectivity between USIM holder GND and module GND;
Recommended to place a 1μF capacitor on USIM_VDD line for decoupling and keep close to the

holder;

Add TVS to protect the USIM card and SIM7200 IC, but the parasitic capacitance should not exceed
50pF. Customer should decide whether the TVS diode is necessary depending on the application,
mechanical enclosure, and USIM connector design.
Table 10: USIM card interface signals
Pin Name Pin No
USIM_VDD 8
USIM_DATA 10
USIM_CLK 12
USIM_RST 14
USIM_DET 16

4.5 I2C Interface

The SIM7200 provides an industry standard I2C serial bus, It is I2C-compliant, high-speed mode
(HS-mode)-compliant, and a master-only device. The interface has been pulled up to 1.8V with 2.2K.
Table 11: Pin definition of the I2C
Pin name Pin number
SCL 30
SDA 32
I2C has the multiplexing function like the PCM interface, and the relation ship can be found in the
following table.
Table 12: I2C multiplexing function
Pin number Pin name
30 SCL
32 SDA
SIM7200-PCIe_ Hardware_Design _V1.01
I/O Description
O External USIM card power
I/O External USIM card data
O External USIM card clock
External USIM
O
signal
I External USIM card detect
Description
I2C serial bus clock
I2C serial bus data
Mode 0(default)
SCL
SDA
Smart Machine Smart Decision
DC Characteristics (V)
Min
-
-
-
card reset
-
-
Mode 1
GPIO19
GPIO18
26
Typ Max
1.8/2.85 -
1.8/2.85 -
1.8/2.85 -
1.8/2.85 -
1.8 -
2016-05-19