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Configuration switch function
Switch
1
2
Quadrature Hysteresis
3
Quadrature Resolution
4
Quadrature Resolution
5
Quadrature Clock Frequency
6
Quadrature Clock Frequency
7
Quadrature Clock Frequency
8
Quadrature hysteresis
The quadrature hysteresis function can be switched on/off using configuration switch number 2.
Electrical noise or axis vibration can cause multiple edges on the digital quadrature lines when
passing through a transition. These multiple edges are caused by multiple transitions across the
switching threshold within the analogue to digital converters from which the digital quadrature is
directly derived. Edges may be produced even if there is no movement, due to noise being present
within the vicinity of the switching threshold. These edges can occur at any frequency up to the
output update rate.
This effect can be removed by including positional hysteresis on the quadrature outputs. This ensures
that a transition can only occur once within one unit of resolution.
Quadrature hysteresis may be enabled on all of the digital output lines. In each case, a transition on
the A line allows a change on the B line to be transmitted and vice versa. This does mean that, when
selected, this hysteresis function will introduce a one unit of resolution offset when a direction change
is made.
AQuad
BQuad
AQuad
BQuad
Function
No Function
Parity
Figure 32 - Configuration switch function
Hysteresis disabled
Hysteresis enabled
Figure 33 - Hysteresis
Notes
Should be set to OFF
ON = Disabled OFF = Enabled
see information later in this section
see information later in this section
see information later in this section
see information later in this section
see information later in this section
Set to ensure an odd number of 'ON' DIP
switch states
35
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