SIM508 Serial port interface signal levels

[alzomor]

Hi

In SIM508 module Hardware design Manual
the max input level for input signals on serial port is 3.2V
While the whole system on the Eval board is supplied from a 4.2 adjustable Voltage regulator.
My Question is
IS the serial port interface capable of reciveing signals higher than 3.2V, and if not How dose the eval board work with a single 4.2V Supply?

Salam
Hossam Alzomor

 

[manhdoasic]

Hi

In SIM508 module Hardware design Manual
the max input level for input signals on serial port is 3.2V
While the whole system on the Eval board is supplied from a 4.2 adjustable Voltage regulator.
My Question is
IS the serial port interface capable of reciveing signals higher than 3.2V, and if not How dose the eval board work with a single 4.2V Supply?

Salam
Hossam Alzomor

Use levelsheft cirrcuit for it.

 

[zourheb]

hi all
i have sim508 and i connect it to micro mega32 without MAX232 because the external pin is 5v and i recieve data but not correct data please help me
i work in baud rate=4800

 

[akvii]

pull up TX and RX pn with 100K resistors