BandRich BandLuxe M250, User Manual

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Figure 1-3 Pin-out information of M250 series (Top View)
1.4 Network LED indicate device
The Network LED indicated device is ground-referenced current sink. The host drives the device to
provide a current path and an appropriate voltage for LED at PIN 42 of M250 module. Figure 2-2
shows the block diagram of the current drivers. Table 2-3 describes the LED output characteristics in
different states.
Figure 1-4 LED Current Driver Example
Current Control
M250 Module
VDD
PIN42
Table 1-2 LED Output
LED State Module Status Description LED Characteristics
OFF Module is not powered. LED is OFF.
ON Module is powered and camped on
network, but not transmitting or receiving.
LED is continuously ON.
Slow blink
Module is powered and searching for
network (not yet registered on network).
LED is flashing at a steady slow
speed.
250ms
±
5% ON period and
750ms
±
5% OFF period