as5045 austriamicrosystems, as5045 Datasheet - Page 6

• Manufacturer Part Number: as5045
• Description: 12-bit Programmable Magnetic Rotary Encoder
• Manufacturer: austriamicrosystems

AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
4.2
The Daisy Chain mode allows connection of several AS5045’s in series, while still keeping just one digital input for data
transfer (see “Data IN” in Figure 5 below). 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 * (18+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 (D11), etc…
(see Figure 6)
Revision 1.2, 03-Oct-06
e.g. 38 bit for two devices, 57 bit for three devices, etc…
CSn
CLK
DO
t
DO active
Daisy Chain Mode
t
CLK FE
1
D11
T
t
CLK/2
DO valid
D10
µC
D9
Data IN
CLK
CSn
D8
D7
Angular Position Data
Figure 5: Daisy Chain hardware configuration
Figure 6: Daisy Chain mode data transfer
D6
DO
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AS5045
1
CSn
st
D5
Device
8
D4
Prog
CLK
D3
D2
DO
AS5045
2
CSn
nd
D1
Device
D0
1
Prog
CLK
st
Device
OCF COF
DO
AS5045
last Device
CSn
LIN
Status Bits
Prog
Mag
CLK
INC
DEC
Mag
18
Even
PAR
D
Angular Position Data
1
D11
2
nd
Device
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2
D10
3
D9