Siemens TC65 Dokumentacja Pobierz pdf (Strona 74)

TC65 Hardware Interface Description

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TC65_HD_V02.000 Page 74 of 120 08.06.2006

3.18.2 Using the SYNC Pin to Control a Status LED

As an alternative to generating the synchronization signal, the SYNC pin can be configured

to drive a status LED that indicates different operating modes of the TC65 module. To take

advantage 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].

Especially in the development and test phase of an application, system integrators are

advised to use the LED mode of the SYNC pin 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 32. Power consumption in the LED

mode is the same as for the synchronization signal

mode. For details see

Table 26, SYNC pin.

Figure 32: LED Circuit (Example)

1 2 ... 69 70 71 72 73 74 75 76 77 78 79 ... 119 120

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