AS5040(2004) 데이터 시트보기 (PDF) - austriamicrosystems AG
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AS5040 Datasheet PDF : 20 Pages
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AS5040 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
Incremental output hysteresis
To avoid flickering incremental outputs at a stationary magnet position, a hysteresis is introduced.
Incremental
output
indication
X +4
X +3
Hysteresis:
2 LSB
X +2
X +1
X
X X +1 X +2 X +3 X +4 X +5
Magnet position
Clockwise direction
Counter clockwise direction
Figure 7: Hysteresis window for incremental outputs
In case of any change of the rotational direction, the
incremental outputs have a hysteresis of 2 LSB (1LSB
upon request).
Regardless of the programmed incremental resolution,
the hysteresis of 2 LSB always corresponds to the
highest resolution of 10 bit. In absolute terms, the
hysteresis is set to 0.704 degrees.
For constant rotational directions, every magnet position
change is indicated at the incremental outputs (Figure 7).
If for example the magnet turns clockwise from position
„x+3“ to „x+4“, the incremental output would also indicate
this position accordingly.
A change of the magnet’s rotational direction back to
position „x+3“ means, that the incremental output still
remains unchanged for the duration of 2 LSB, until
position „x+2“ is reached. After this transition, the
incremental outputs directly indicate every new position,
while the rotational direction is constant.
Daisy Chain Mode
It is possible to connect several AS5040’s in series,
while reading them by just one serial data line. This so-
called “daisy-chain” mode is accomplished by connecting
the data output (DO; pin 9) to the data input (PROG; pin
8) of the subsequent device. The serial data of all
connected devices is read from the DO pin of the last
device in the chain. The length of the serial bit stream
increases with every connected device, it is
n x (16+1) bits:
e.g 34bit for two devices, 51bit for three devices,etc…
The last data bit of the first device (Parity) is followed by
a logic "0" and the first data bit of the second device
(D9), etc..
µC
Data IN
AS5040
DO PROG
AS5040
DO PROG
AS5040
DO PROG
CLK
CSn
Revision 1.1
CSn CLK
CSn CLK
CSn CLK
www.austriamicrosystems.com
Figure 8: Daisy Chain Mode configuration
Page 7 of 20
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