Cinterion BGS3, Hardware Interface Description

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BGS3 Hardware Interface Description
3.12 Control Signals
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BGS3_HD_v01.000d Page 62 of 109 2010-03-26
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3.12.2 Using the SYNC Line to Control a Status LED
As an alternative to generating the synchronization signal, the SYNC line can be configured to
drive a status LED that indicates different operating modes of the BGS3 module. To take ad-
vantage of this function the LED mode must be activated with the AT^SSYNC command and
the LED must be connected to the host application. The connected LED can be operated in two
different display modes (AT^SSYNC=1 or AT^SSYNC=2). For details please refer to
[1] .
Figure 27:
LED Circuit (Example)
Especially in the development and test phase of an application, system integrators are advised
to use the LED mode of the SYNC line in order to evaluate their product design and identify the
source of errors.
To operate the LED a buffer, e.g. a transistor or gate, must be included in your application. A
sample circuit is shown in
Figure 27 . Power consumption in the LED mode is the same as for
the synchronization signal mode. For details see Table 27 , SYNC signal.