SCES592I July 2004 – September 2017 SN74AUP1G79
PRODUCTION DATA.
NOTE
Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.
A rotary quadrature encoder is a simple, infinitely-turning knob that outputs two out-of-phase square waves as it is turned and is often used in electronics as a method of human interface. One signal will lead the other in phase depending on which direction the knob is turned. The SN74AUP1G79 can be used to determine which direction the knob is being turned without the need for a microcontroller or other complex monitoring system by connecting the outputs of the knob to the D and CLK inputs of the SN74AUP1G79 as shown in Figure 7. It is important to note that the CLK input will control when the direction signal changes, as shown in Figure 8.
The SN74AUP1G79 device uses CMOS technology and has balanced output drive. Take care to avoid bus contention because it can drive currents that would exceed maximum limits.