> 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].
> Figure 37: 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 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 37. Power consumption in the LED mode is the same as for the synchronization signal mode. For details see Table 30, SYNC pin.