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AS5040
Data Sheet
Programming Daisy Chained Devices
In Daisy Chain mode, the Prog pin is connected directly to the DO pin of the subsequent device in the chain (see
Figure 6). During programming (see section 12), a programming voltage of 7.5V must be applied to pin Prog. This
voltage level exceeds the limits for pin DO, so one of the following precautions must be made during programming:
open the connection DO
Prog during programming or
add a Schottky diode between DO and Prog (Anode = DO, Cathode = Prog)
Due to the parallel connection of CLK and CSn, all connected devices may be programmed simultaneously.
Figure 6: Daisy Chain Hardware Configuration
CSn
CSn
CSn
CSn
MCU
CLK
DI
CLK
DO
AS5040
PROG
100R
1nF
GND
CLK
DO
PROG
AS5040
100R
1nF
GND
CLK
DO
PROG
AS5040
GND
Figure 7: Daisy Chain Mode Data Transfer
CSn
t CLK FE
T CLK/2
CLK
1
8
16
D
1
2
3
DO
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
OCF
COF
LIN
Mag
INC
Mag
DEC
Even
PAR
D9
D8
D7
t DO active
t DO valid
Angular Position Data
Status Bits
Angular Position Data
1 st Device
2 nd Device
8 Incremental Outputs
Three different incremental output modes are possible with quadrature A/B being the default mode.
Figure 8 shows the two-channel quadrature as well as the step / direction incremental signal (LSB) and the direction
bit in clockwise (CW) and counter-clockwise (CCW) direction.
Quadrature A/B Output (Quad A/B Mode)
The phase shift between channel A and B indicates the direction of the magnet movement. Channel A leads channel
B at a clockwise rotation of the magnet (top view) by 90 electrical degrees. Channel B leads channel A at a counter-
clockwise rotation.
LSB Output (Step / Direction Mode)
Output LSB reflects the LSB (least significant bit) of the programmed incremental resolution (OTP Register Bit Div0,
Div1). Output Dir provides information about the rotational direction of the magnet, which may be placed above or
below the device (1=clockwise; 0=counter clockwise; top view). Dir is updated with every LSB change.
In both modes (quad A/B, step/direction) the resolution and the index output are user programmable. The index pulse
indicates the zero position and is by default one angular step (1LSB) wide. However, it can be set to three LSBs by
programming the Index-bit of the OTP register accordingly (see Table 6).
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