insys icom i-modul 144/56k, Designer'S Manual, Page: 10 / 63

Connections i-modul Modem 144/56k
2.4 PIN specifications
All following specifications are based on a supply voltage of V
CC
= 5 V ± 5%. High =
V
IH
; Low = V
IL
(refer to Technical Data).
2.4.1 Reset Input
Pin Signal Type Description
11 Reset~ Input Normal state: 1 (internal pull-up resistor)
Reset: 0 (against GND)
A minimum time of
0 . 1
s for activation is recommended to trigger the
reset safely.
Table 6: PIN specifications - reset input
2.4.2 Indication Signals
Pin Signal Type Description
13 OH~ Output This output indicates Off-Hook of the modem.
Signaling:
Normal state:
High (hung up)
Off-Hook: Low (off-hook)
15 RI~ Output The ring indicator indicates an incoming connection attempt.
Signaling:
Normal state:
High
Ring: Low
Table 7: PIN specifications - indication signals
Figure 2: Connection example of the OH signal
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