January 2001/ version 1.4
WMOi3 Integrated Modem
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4.1.6 Reset signal (~RST)
This signal is used to force a reset of the WMOi3. It has to be used by providing
low level during approximately 2ms. 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.
This signal can also be used to provide a reset to an external device. 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. See below an example of
application diagram.
Reset : pin 19
Switch reset
figure 9 : reset procedure
If switch Reset = 1, Reset pin 19 = 0
If switch Reset = 0, Reset pin 19 = 1
Table 10 : reset signal pin description
Signal Pin number I/O I/O type* Description
∼RST
19 I/O Module Reset
*See Table 3 “operating conditions” in subdivision 4.1.1The 50-pin
connector description
Table 11 : reset signal electrical characteristics
Parameter Min Max Unit
Input Impedance ( R ) 4.7
kΩ
Input Impedance ( C ) 10 NF
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