Telit Wireless Solutions GL865 V3, Руководство пользователя

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HW User Guide
1vv0301018 Rev. 15 Page 52 of 72 2019-01-07
The risk is that the fo could easily fall outside of new bandwidth; consequently the SPL
could be much lower than the expected.
WARNING:
It is very important to respect the sense of the applied voltage: never
apply to the "-" pin a voltage more positive than the "+" pin: if this
happens, the diaphragm vibrates in the opposite direction with a high
probability to be expelled from its physical position. This damages the
device permanently.
11.8.4. Working Current Influence
In the component data sheet you will find the value of MAX CURRENT: this represents
the maximum average current that can flow at nominal voltage without current limitation.
In other words it is not the peak current, which could be twice or three times higher. If
driving circuitry does not support these peak values, the SPL will never reach the declared
level or the oscillations will stop.
STAT LED Indication of network service availability
The STAT_LED pin status shows information on the network service availability and Call
status.
In the GL865 V3/V3.1 modules, the STAT_LED usually needs an external transistor to
drive an external LED.
Therefore, the status indicated in the following table is reversed with respect to the pin
status.
LED status Device Status
Permanently off Device off
Fast blinking
(Period 1s, Ton 0,5s)
Net search / Not registered
/ turning off
Slow blinking
(Period 3s, Ton 0,3s)
Registered full service
Permanently on a call is active
A schematic example could be: