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EM14 Datasheet(PDF) 3 Page - Bourns Electronic Solutions |
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EM14 Datasheet(HTML) 3 Page - Bourns Electronic Solutions |
3 / 8 page EMS22 Output Waveforms Quadrature: This output waveform is the most common among all contacting and non- contacting encoders. Quadrature, also known as 2-bit quadrature or incremental, is often used to determine magnitude (count) and direction (up/ down) by an external interface circuit. EMS22 comes equipped with such capability; an external interface circuit is not required. It also offers an indexed output with an adjustable width of one or three times the absolute position value that can be used for counting the shaft rotation. Direction/Step: This output is very similar to the quadrature waveform but offers up to 512 PPR, as opposed to 256 PPR in quadrature. This output can be used in incremental counting applications where a better resolution is desired. Indexing output is also available with a Direction/Step output waveform. Absolute: Absolute output refers to the absolute angular position. This type of output is especially useful for applications where the absolute position of a device, such as a camera, is necessary to locate an object. Also with 1024 distinct angular positions, the EMS22 offers very high resolution indexing at every 0.35 °. This type of output code is not affected by a power outage to the encoder since each angular position of the encoder has a unique code. PWM: Pulse-Width Modulation is another form of absolute waveform that utilizes the square wave output generated by the sensor to control the duty cycle of the output at different desired shaft positions. The EMS22 encoder can generate pulse widths as low as 1 µs, and as high as 1024 µs in a complete signal period of 1025 µs. Some advantages of using this output waveform over other output types include immunity to noise and faster data acquisition. Figure 2: AS5040 ASSP in Two Different States |
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