AS5020 データシートの表示（PDF） - austriamicrosystems AG
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AS5020 Datasheet PDF : 11 Pages
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6-Bit Magnetic Position Encoder –Data Sheet Rev.1.0
AS5020
PD/CS
1
2
CLK
7
8
9
DATA
Latch
actual value
D5 D4 D0 NVR Parity
D5 D4 D0 NVR Parity
angle 1
angle 2
angle n
Figure 3 Daisy Chain read out
D5
Next
value
Zero Position Programming
A simple single pin programming allows changing the initial zero position. It is easy to program
permanently a new zero-reference into the internal OTP (one time programmable) ROM. This
allows a fast and economic magnet placement since the intrinsic orientation is not important.
Single Pin Programming is provided via the PROG pin. Fig.4 shows the typical programming
sequence needed for fixing the new zero position.
Zero Position Programming Sequence
Before calibration, the new zero position must be adjusted in measurement mode (PD/CS=0).
The rising edge of PD/CS gets the actual position and stores it internally for the permanent
programming. A high level at the PROG Pin during power-down (PD/CS=1) with a minimum
duration of 300 V#HQDEOHV#SURJUDPPLQJ1#$IWHU#RQH#LQLWLDO#GXPP\#ELW#SXOVH/#VL[#SXOVHV#RI#;928µs
select the latched position information and zap the reference value into the OTP ROM.
Continuous Read Out Mode Selection
An optional 9th pulse after the initialisation pulse, the dummy pulse, and the 6 data pulses can
be used to set Continuous Read Out Mode (see Fig.4).
PROG [V]
8
tProgEN
Initialisation
Zero Position Programming
Enable
Programming
0
Calibration Position
Latched
1
2
3
4
5
6
Dummy
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
CS
Figure 4 Programming sequence
Note: Daisy Chain configuration is not possible in Continuous Read Out Mode.
Optional
7
8
Bit 5 Cont.
t
Mode
Measurement
Enable
Rev. n/c
Page 5/11
Feb 2001
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