41110590
Rev 6.1
January 28, 2019
20
Product Technical Specification and
User Guide
Interfaces/Peripherals
Table 8.
Micro-Fit Connector Pin Description
Pin #
Signal
I/O
I/O Type
Voltage
Description
1
DCIN
I
Power Supply
4.75V to 32V
4.75V to 32V DC input
2
RS232-DTR
I
RS-232
-5.5V to 5.5V
Data Terminal Ready
3
RS232-RXD
O
RS-232
-5.5V to 5.5V
Receive Serial Data
4
RS232-CTS
O
RS-232
-5.5V to 5.5V
Clear To Send
5
-
-
-
-
Reserved
6
GND
-
GND
GND
Ground
7
RS232-TXD
I
RS-232
-5.5V to 5.5V
Transmit Serial Data
8
RS232- RTS
I
RS-232
-5.5V to 5.5V
Request To Send
Note:
Pins 2-4 and Pins 7-8 are used by the serial link interface. It is strictly prohibited to connect them to
any power supply at the risk of damaging the GL7x00.
2.2.1.1.
Power Supply
The GL7x00 can only be supplied by an external DC voltage (DCIN) that ranges from 4.75V to 32V at
2.2A. This input is available via the 8-pin Micro-Fit connector.
Table 9.
Input Power Supply Voltage
Pin Number
Signal
Description
1
DCIN
4.75V to 32V DC input
6
GND
Ground Connection
Note that the correct operation of the GL7x00 in communication mode is not guaranteed if input
voltage (DCIN) falls below 4.75V.
The following table describes the consequences of having the GL7x00 go either over or under the
specified voltage range.
Table 10.
Effects of Power Supply Overload/Underload
If the voltage
Then
Falls below 4.75V
Wireless communication is not guaranteed.
Is over 32V (transient peaks)
External protection should be implemented on the GL7x00.
Is over 32V (continuous over voltage)
External protection should be implemented on the GL7x00.
Additionally, when a GL7600 has not been used for a long time, the power supply should provide
sufficient inrush current for the modem.
Table 11.
Typical Inrush Current
Power Supply (V)
Measurement Time from Power-Up (s)
Typical Inrush Current Value (mA)
4.75
0.1
120
9
0.1
80
16
0.1
60