AS5043_1 AMSCO [austriamicrosystems AG], AS5043_1 Datasheet - Page 9

• Manufacturer Part Number: AS5043_1
• Description: Programmable 360 Magnetic Angle Encoder with Absolute SSI and Analog Outputs
• Manufacturer: AMSCO [austriamicrosystems AG]

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:
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
Figure 7: Daisy Chain Data Transfer Timing Diagram
www.austriamicrosystems.com
e.g. 34 bit for two devices, 51 bit for three devices, etc…
C S n
C LK
D O
MCU
t
D O active
t
C LK F E
CSn
CLK
DI
T
C LK /2
t
D O valid
1
D 9
D 8
CSn
CLK
DO
D 7
AS5043
D 6
A ngular P osition D ata
PROG
D 5
D 4
GND
D 3
1nF
Revision 1.80
100R
8
D 2
CSn
CLK
DO
D 1
AS5043
1
D 0
st
D evice
O C F
PROG
C O F
S tatus B its
LIN
M ag
IN C
GND
M ag
D E C
1nF
100R
16
E ve n
P A R
CSn
CLK
DO
A ngular P osition D ata
D
2
AS5043
1
D 9
nd
D evice
2
D 8
PROG
9 – 36
D 7
3
GND