Altec ISDN Socket Modem AL5068S-3V - Manual (Page 17)

AL5068S Designer’s Guide
No. AL5068S-E00-105 Altec Electronic AG Seite 17 / 25
3.4 External Reset Interface
The AL5068S Socket Modem provides an external RESET input pin. This
signal is used to force a reset procedure by providing low level during at least
100uS. This signal has to be considered as an emergency reset only. A
reset procedure is already driven by an internal hardware during the power-
up sequence. If no external reset is necessary this input can be left open. If
used (emergency reset), it has to be driven by an open collector or an open
drain.
3.4.1 Recommended Reset Circuit
Switch Reset Reset (Pin 24) Reset Status
1 0 Active
0 1 Inactive
Additional comments on RESET:
The reset process is activated either by the external Reset signal OR by an
internal signal (coming from the internal RESET generator). This automatic
reset is activated at power-up.
The module remains in reset mode as long as the reset signal is held low. As
soon as the reset is complete, the AT interface answers “OK” to the
application.
SWITCH
RESET
RESET:
PIN 24
NPN