AS5040-ASST View Datasheet(PDF) - austriamicrosystems AG
Part Name
Description
MFG CO.
'AS5040-ASST' PDF : 61 Pages View PDF
AS5040 − Incremental Outputs
Incremental Outputs
Figure 26:
Incremental Output Modes
Three different incremental output modes are possible with
quadrature A/B being the default mode.
Figure 26 shows the two-channel quadrature as well as the
step/direction incremental signal (LSB) and the direction bit in
clockwise (CW) and counter-clockwise (CCW) direction.
Quadrature A/B Output (Quad A/B Mode)
The phase shift between channel A and B indicates the direction
of the magnet movement. Channel A leads channel B at a
clockwise rotation of the magnet (top view) by 90 electrical
degrees. Channel B leads channel A at a counter-clockwise
rotation.
LSB Output (Step/Direction Mode)
Output LSB reflects the LSB (least significant bit) of the
programmed incremental resolution (OTP Register Bit Div0,
Div1). Output Dir provides information about the rotational
direction of the magnet, which may be placed above or below
the device (1=clockwise; 0=counter clockwise; top view). Dir is
updated with every LSB change.
In both modes (quad A/B, step/direction) the resolution and the
index output are user programmable. The index pulse indicates
the zero position and is by default one angular step (1LSB) wide.
However, it can be set to three LSBs by programming the
Index-bit of the OTP register accordingly (see Figure 36).
Quad A/B-Mode
A
B
Index
Step / Dir-Mode
LSB
D ir
CSn
t Incremental outputs valid
M e ch anical
Zero Position
Rotation Direction
Change
M e c h an ic al
Zero Position
Index=0
1LSB
Index=1
3 LSB
Clockwise cw
Hyst =
2 LSB
Counterclockwise ccw
t Dir valid
ams Datasheet
[v2-12] 2017-Jun-20
Page 23
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