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AS5043ASST Datasheet(PDF) 9 Page - ams AG

Part # AS5043ASST
Description  Programmable 360 Magnetic Angle Encoder with Absolute SSI and Analog Outputs
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS5043ASST Datasheet(HTML) 9 Page - ams AG

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AS5043
Data Sheet – Daisy Chain Mode
www.austriamicrosystems.com
Revision 1.80
9 – 36
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. An RC filter must be implemented between each PROG pin of device n
and DO pin of device n+1, to prevent then encoders to enter the alignment mode, in case of ESD discharge, long cables,
not conform signal levels or shape. Using the values R=100R and C=1nF allow a max. CLK frequency of 1MHz on the
whole chain. 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).
Figure 6: Daisy Chain Hardware Configuration
CSn
PROG
DI
CLK
CSn
DO
CLK
CSn
DO
CLK
PROG
CSn
DO
CLK
PROG
100R
100R
1nF
1nF
GND
GND
GND
MCU
AS5043
AS5043
AS5043
Figure 7: Daisy Chain Data Transfer Timing Diagram
Even
PAR
CSn
CLK
DO
D 9
D8
D7
D6
D 5
D 4
D 3
D 2
D1
D0
18
16
COF
LIN
OCF
Mag
IN C
Mag
DEC
1
tCLK FE
A ngular Position D ata
Status Bits
TCLK/2
tDO active
tDO valid
D
2
D9
D8 D7
1st D evice
2nd Device
3
A ngular Position D ata


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