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AS5043 Datasheet(PDF) 6 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) 6 Page - ams AG

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AS5043 Programmable 360° Magnetic Angle Encoder
Revision 1.4, 04-Apr-06
www.austriamicrosystems.com
Page 6 of 26
AS5043
1st Device
PROG
DO
CLK
CSn
CLK
µC
PROG
DO
CLK
CSn
PROG
DO
CLK
CSn
Data IN
CSn
AS5043
2nd Device
AS5043
3rd Device
Figure 6: Daisy Chain hardware configuration
9 Mode Input Pin
The absolute angular position is sampled at a rate of
10.4kHz (t=96µs) in fast mode and at a rate of 2.6kHz
(t=384µs) in slow mode.
These modes are selected by pin MODE (#2). The mode
input pin activates or deactivates an internal filter, which
is used to reduce the digital jitter and consequently the
analog output noise.
Activating the filter by pulling Mode = LOW or leaving it
open reduces the transition noise to <0.03° rms. At the
same time, the sampling rate is reduced to 2.6kHz and
the signal propagation delay is increased to 384µs. This
mode is recommended for high precision, low speed and
≤360° applications.
Deactivating the filter by setting Mode = HIGH increases
the sampling rate to 10.4kHz and reduces the signal
propagation delay to 96µs. The transition noise will
increase to <0.06° rms. This mode is recommended for
higher speed and full scale = 360° applications.
Switching
the
MODE
pin
affects
the
following
parameters:
Parameter
slow mode
(Pin MODE = 0 or
open)
fast mode
(Pin MODE = 1)
sampling rate
2.61 kHz
(383µs)
10.42 kHz
(95.9µs)
transition noise
(1 sigma)
≤ 0.03° rms
≤ 0.06° rms
propagation
delay
384µs
96µs
Startup time
20ms
80ms
Table 4: Mode pin settings
Pin MODE should be set at power-up. A mode change
during operation is not recommended.
10 Daisy Chain Mode
The Daisy Chain Mode allows connection of
several AS5043’s in series, while still
keeping just one digital input for data
transfer (See “Data IN” in Figure 6 ). This
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 first device in
the chain. The length of the serial bit
stream increases with every connected
device, it is
n * (16+1) bits:
e.g. 34 bit for two devices, 51 bit for three devices, etc…
The last data bit of the first device (Parity) is followed by a dummy bit and the first data bit of the second
device (D9), etc… (see Figure 7)
Even
PAR
CSn
CLK
DO
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
18
16
CO F
LIN
OCF
Mag
INC
Mag
DEC
1
t
CLK FE
Angular Position Data
Status Bits
T
CLK/2
t
DO active
t
DO valid
D2
D9
D8
D7
1st Device
2nd Device
3
Angular Position Data
Figure 7: Daisy Chain data transfer timing diagram


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