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April. 2002 (Rev.0)
www.interpionsemi.com
AD6392
4-CH MOTOR DRIVE IC
APPLICATION SUMMARY
- Mute function through power reference or signal reference pins
Muting all channel drivers can be obtained through power reference or signal reference pins. Fig.1 shows
the simplified schematic diagram for power/signal reference mute.
Pin6, Pin23, Pin25
Mute
Above 1.0V
off
Below 1.0V
on
Fig. 1 Power reference, Signal reference & all mute function
As it can be seen in Fig. 1, pin6, pin23 and pin25 are connected
to the positive input terminals of comparators, and the internal
1.0V reference is connected to the negative input terminals.
Thus, if the voltage applied to each pins falls below 1.0V, Q1
and Q2 become on and hence the bias currents for all channel
drivers become to be shut down. Thus all mute function can be
carried out.
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