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AS5043 Datasheet(PDF) 4 Page - ams AG

Part No. AS5043
Description  PROGRAMMABLE 360° MAGNETIC ANGLE ENCODER WITH ABSOLUTE SSI AND ANALOG OUTPUTS
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Maker  AMSCO [ams AG]
Homepage  http://www.ams.com
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AS5043 Datasheet(HTML) 4 Page - ams AG

 
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AS5043 Programmable 360° Magnetic Angle Encoder
Revision 1.4, 04-Apr-06
www.austriamicrosystems.com
Page 4 of 26
7 3.3V / 5V Operation
The AS5043 operates either at 3.3V ±10% or at 5V
±10%. This is made possible by an internal 3.3V Low-
Dropout (LDO) Voltage regulator. The core supply
voltage is always taken from the LDO output, as the
internal blocks are always operating at 3.3V.
For 3.3V operation, the LDO must be bypassed by
connecting VDD3V3 with VDD5V (see Figure 4 ).
For 5V operation, the 5V supply is connected to pin
VDD5V, while VDD3V3 (LDO output) must be buffered by
a 1...10µF capacitor, which should be placed close to the
supply pin (see).
The VDD3V3 output is intended for internal use only It
should not be loaded with an external load.
The voltage levels of the digital interface I/O’s
correspond to the voltage at pin VDD5V, as the I/O
buffers are supplied from this pin (see Figure 4).
Figure 4: Connections for 5V / 3.3V supply voltages
A buffer capacitor of 100nF is recommended in both
cases close to pin VDD5V.
8 10-bit Absolute Synchronous
Serial Interface (SSI)
The serial data transmission timing is outlined in Figure
5: if CSn changes to logic low, Data Out (DO) will change
from high impedance (tri-state) to logic high and the
read-out sequence 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 / out of range) .
A subsequent measurement is initiated by a logic “high”
pulse at CSn with a minimum duration of tCSn.
Data transmission may be terminated at any time by
pulling CSn = high.
8.1
Serial Data Contents:
D9:D0 absolute angular position data (MSB is clocked
out first).
OCF (Offset Compensation Finished), logic high
indicates that the Offset Compensation Algorithm has
finished and data is valid.
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.
This alarm may be resolved by bringing the magnet
within the X-Y-Z tolerance limits.
LIN (Linearity Alarm), logic high indicates that the input
field generates a critical output linearity.
When this bit is set, the data at D9:D0 may still be used,
but may contain invalid data. This warning may be
resolved by bringing the magnet within the X-Y-Z
tolerance limits.
Data D9:D0 is valid, when the status bits have the
following configurations:
OCF
COF
LIN
Mag
INC
Mag
DEC
Parity
0
0
0
1
1
0
0
1
0
even
checksum
of bits 1:15
Table 2: Status bit outputs


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