AS5040ASST(2006) Просмотр технического описания (PDF) - austriamicrosystems AG
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AS5040ASST Datasheet PDF : 28 Pages
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AS5040 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
CSn
tCLK FE TCLK/2
1
8
CLK
16 D 1 2 3
DO
tDO active
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Mag Mag Even
OCF COF LIN INC DEC PAR
D9 D8 D7
tDO valid
Angular Position Data
1st Device
Status Bits
Figure 6: Daisy Chain mode data transfer
Angular Position Data
2nd Device
5 Incremental Outputs
Three different incremental output modes are possible
with quadrature A/B being the default mode.
Figure 7 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.
5.1 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.
5.2 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 Table 6).
Quad A/B-Mode
A
B
Index
Step / Dir-Mode
LSB
D ir
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
CSn
t Incremental outputs valid
Revision 1.6, 03-Oct-06
t Dir valid
Figure 7: Incremental output modes
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