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20 U2121A-101 Operating Guide
Pulse drive
Pulse drive method controls the switches using a ~30 ms pulse. As
shown in the figure below, the control signal is applied to one of the
control bit and held for the preset time.
General IO
There are three digital outputs and three digital inputs available in
the U2121A-101 as an auxiliary port. These three output pins are
capable to drive up to 300 mA of load. The digital input pin has a
direct connection to the U2121A.
Output
enable
Drive ChA
Drive ChB
Drive active
Drive active
Controlled supply
Output
From U2121A DO
Input
To U2121A DI
Output circuit Input circuit
U2931A Operating Guide.book Page 20 Tuesday, June 10, 2008 10:17 AM