Telit Wireless Solutions HE910 User Manual

HE910 Hardware User Guide
1VV0300925 Rev. 32 Page 77 of 111 2019-11-25
12. SERIAL PORTS
The HE910 module is provided with by 2 Asynchronous serial ports:
• MODEM SERIAL PORT 1 (Main)
• MODEM SERIAL PORT 2 (Auxiliary)
Several configurations can be designed for the serial port on the OEM hardware, but the
most common are:
• RS232 PC com port
• microcontroller UART @ 1.8V (Universal Asynchronous Receive Transmit)
• microcontroller UART @ 5V or other voltages different from 1.8V
Depending from the type of serial port on the OEM hardware a level translator circuit may
be needed to make the system work.
The electrical characteristics of the Serial ports are explained in the following tables:
Absolute Maximum Ratings -Not Functional
Parameter
Min
Max
Input level on any digital
pin (CMOS 1.8) with
respect to ground
-0.3V
2.1V
Operating Range - Interface levels (1.8V CMOS)
Level
Min
Max
Input high level
1.5V
1.9V
Input low level
0V
0.35V
Output high level
1.6V
1.9
Output low level
0V
0.2V

Telit Wireless Solutions HE910 Specifications

General

Brand	Telit Wireless Solutions
Model	HE910
Category	Control Unit
Language	English