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AS5040-ASST View Datasheet(PDF) - austriamicrosystems AG

Part Name
Description
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AS5040-ASST
AMSCO
austriamicrosystems AG AMSCO
AS5040-ASST Datasheet PDF : 61 Pages
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AS5040 − 10-Bit Absolute AngularPositionOutput
10-Bit Absolute Angular
Position Output
Synchronous Serial Interface (SSI)
Figure 21:
Synchronous Serial Interface with Absolute Angular Position Data
CSn
t CLK FE T CLK / 2
1
8
CLK
t CSn t CLK FE
16
1
DO
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
OCF COF
LIN
Mag M ag Even
I N C D EC PAR
D9
t DO active
t DO valid
Angular Position Data
Status Bits
t DO Tristate
If CSn changes to logic low, Data Out (DO) will change from high
impedance (tri-state) to logic high and the read-out will be
initiated.
After a minimum time tCLK FE, data is latched into the
output shift register with the first falling edge of CLK.
Each subsequent rising CLK edge shifts out one bit of data.
The serial word contains 16 bits, the first 10 bits are the
angular information D[9:0], the subsequent 6 bits contain
system information, about the validity of data such as
OCF, COF, LIN, Parity and Magnetic Field status
(increase/decrease).
A subsequent measurement is initiated by a log. “high”
pulse at CSn with a minimum duration of tCSn.
Data Content
D9:D0 absolute angular position data (MSB is clocked out
first)
OCF (Offset Compensation Finished), logic high indicates
the finished Offset Compensation Algorithm. For fast
startup, this bit may be polled by the external
microcontroller. As soon as this bit is set, the AS5040 has
completed the startup and the data is valid (see Figure 23)
COF (CORDIC Overflow), logic high indicates an out of
range error in the CORDIC part. When this bit is set, the
data at D9:D0 is invalid. The absolute output maintains the
last valid angular value.
Page 18
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ams Datasheet
[v2-12] 2017-Jun-20
 

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