AS5043ASST Просмотр технического описания (PDF) - austriamicrosystems AG
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AS5043ASST
austriamicrosystems AG
AS5043ASST Datasheet PDF : 37 Pages
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AS5043
Data Sheet – Daisy Chain Mode
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),
lid etc… (see Figure 7).
Figure 6: Daisy Chain Hardware Configuration
ill va CSn
CLK
DI
G st MCU
CSn
CLK
DO
PROG
AS5043
CSn
CLK
100R
DO
PROG
1nF
GND
AS5043
100R
1nF
GND
CSn
CLK
DO
PROG
AS5043
GND
A t Figure 7: Daisy Chain Data Transfer Timing Diagram
s en CSn
tCLK FE T CLK/2
m t 1
8
a n CLK
16
D
1
2
3
o DO
Technical c tDOactive
D9 D8
D7
D6
D5 D4
D3
D2
D1
D0 OCF COF
LIN
Mag Mag Even
INC DEC PAR
D9 D8 D7
tDO valid
Angular Position Data
1st Device
Status Bits
Angular Position Data
2nd Device
www.austriamicrosystems.com
Revision 1.80
9 – 36
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