Smart Machine Smart Decision
SIM5320JE-TE_Hardware Design_V1.01
2012-07-10
36
receiver, depending on the device function. Use AT Commands “AT+CRIIC and AT+CWIIC” to read/write
register values of related peripheral equipments connected with I2C interface.
3.6.1
Pin Description
Table 18: Pin description
3.6.2
Signal Description
Both SDA and SCL are bidirectional lines, connected to a positive supply via a pull-up resistor
respectively. When the bus is free, both lines are high.
3.6.3
Design Guide
For SIM5320JE-TE, the data on the I2C bus can be transferred at rates up to 400kbps. The number of
peripheral devices connected to the bus is solely dependent on the bus capacitance limit of 400pF. Note
that PCB traces length and bending are in users’ control to minimize load capacitance.
Note
：
I2C_SDA and I2C _SCL have been pulled up with two 2.2kR resistors to 2.6V level in module. So there is no need
to pull them up in users’ application circuit.
3.7
Keypad Interface
SIM5320JE-TE module provides a keypad interface that supports five sense lines, or columns, and five
keypad rows. The interface generates an interrupt when any key is pressed.
Its operation voltage is 1.8V.
3.7.1
Pin Description
Pin name
Pin No.
Function
I2C_SDA
64
Serial interface data input and output
I2C_SCL
65
Serial interface clock input
