Rainbow-electronics GM862-QUAD-PY Manual do Utilizador descarregar pdf (Página 14)

GM862-QUAD / PY Hardware User Guide

1vv0300748 Rev. 5 - 20/09/07

4.2 GSM Antenna - Installation Guidelines

• Install the antenna in a place covered by the GSM signal.

• The Antenna must be installed to provide a separation distance of at least 20 cm from all persons

and must not be co-located or operating in conjunction with any other antenna or transmitter;

• Antenna shall not be installed inside metal cases

• Antenna shall be installed also according Antenna manufacturer instructions.

4.3 Logic level specifications

Where not specifically stated, all the interface circuits work at 2.8V CMOS logic levels. The following

table shows the logic level specifications used in the Telit GM862-QUAD/PY interface circuits:

Absolute Maximum Ratings -Not Functional

Parameter Min Max

Input level on any

digital pin when on

-0.3V +3.6V

Input voltage on

analog pins when on

-0.3V +3.0 V

Voltage on Buffered

pins

-0.3V 25V

Operating Range - Interface levels (2.8V CMOS)

Level Min Max

Input high level 2.1V 3.3V

Input low level 0V 0.5V

Output high level 2.2V 3.0V

Output low level 0V 0.35V

For 2,0V signals:

Operating Range - Interface levels (2.0V CMOS)

Level Min Max

Input high level 1.6V 3.3V

Input low level 0V 0.4V

Output high level 1,65V 2.2V

Output low level 0V 0.35V

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 67 68

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