A circuit for selectively disabling and enabling n-coils includes n-drivers in
a totem-pole configuration. Each of the n-drivers includes two transistors whose
control terminals connect at a common node. Each n-driver is used to operate one
of the n-coils by being responsive at its common node to (i) a coil disable signal
by activating one transistor thereof and deactivating the other transistor thereof
thereby drawing current away from and thus disabling its corresponding coil and
allowing current to flow through the one transistor and thus be available as a
source of current to a successive one of the n-drivers and (ii) a coil enable signal
by deactivating the one transistor thereof and activating the other transistor
thereof thereby allowing current to flow serially through its corresponding coil
and the other transistor thus enabling its corresponding coil and to be available
as a source of current to the successive n-driver.
