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
Measurement Modes
Two measurement modes can be selected by programming:
1) Single Read Out Mode (default)
2) Continuous Read Out Mode (OTP option)
Chip Select must be active low (PD/CS=0) to enable measurement and bring the output DATA
out of high impedance state.
After a minimum measurement period, the first falling edge of CLK latches the actual measured
angular value. The following rising edges shift the data bits out of the DATA pin, beginning with
the most significant bit. An NVR bit and even parity bit are added to the 6 bit angular value. The
NVR bit indicates a non-valid range given by bad magnet positioning.
PD/CS
1
2
CLK
Reset not necessary in
Continuos Mode
7
8
9
DATA
D5 D4
(MSB)
Latch
actual value
D0 NVR
Parity
Next
value
D5
(MSB)
Figure 1 SSI read out
In Single Read Out Mode the start of a new measurement has to be initiated with a short pulse
at PD/CS of at least 1 clockcycle. The following falling edge of CLK latches a new measured
value.
If the OTP option Continuous Read Out Mode is chosen, repeated angle measurement is
enabled by PD/CS=0. After each read out sequence the output shift register is automatically
refreshed. Fast transmission of the angular data can be performed without pulsing PD/CS.
Daisy Chain Configuration
In Singe Read Out mode, cascading allows Daisy Chain structures to minimise the
interconnection lines. Connecting DATA with PROG of the cascaded Sensor (see Fig. 2) allows
the read out of n sensors with the use of only three wires. The measurement data is shifted in
this configuration through the devices
After n x 9 clock cycles each value of n sensors is visible at pin DATA of the first sensor device.
A new measurement can be started with the falling edge of CLK after a power down pulse at
PD/CS.
n
µC
AS5020
PROG DATA
CLK PD/CS
2
AS5020
PROG DATA
CLK PD/CS
1
AS5020
PROG DATA
CLK PD/CS
CLK
Power Down
Data In
Rev. n/c
Figure 2 Typical Daisy Chain Configuration
Page 4/11
Feb 2001
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