AS5040

Data Sheet

www.austriamicrosystems.com

Revision 2.10

19 - 33

Table 6: One Time Programmable (OTP) Register Options

OTP-Mode-Register-Bit

Pin #

Pulses per

Revolution

Incremental

Resolution

Mode

Md1

Md0

Div1

Div0

Index

3

4

6

12

ppr

bit

Default (Mode0.0)

0

0

0*

0*

0*

1LSB

quadAB-Mode1.0

0

1

0

0

0

1LSB

quadAB-Mode1.1

0

1

0

0

1

3LSBs

2x256

10

quadAB-Mode1.2

0

1

0

1

0

1LSB

quadAB-Mode1.3

0

1

0

1

1

3LSBs

2x128

9

quadAB-Mode1.4

0

1

1

0

0

1LSB

quadAB-Mode1.5

0

1

1

0

1

3LSBs

2x64

8

quadAB-Mode1.6

0

1

1

1

0

1LSB

quadAB-Mode1.7

0

1

1

1

1

A

B

3LSBs

PWM

10 bit

2x32

7

Step/Dir-Mode2.0

1

0

0

0

0

1LSB

Step/Dir-Mode2.1

1

0

0

0

1

3LSBs

512

10

Step/Dir -Mode2.2

1

0

0

1

0

1LSB

Step/Dir -Mode2.3

1

0

0

1

1

3LSBs

256

9

Step/Dir -Mode2.4

1

0

1

0

0

1LSB

Step/Dir -Mode2.5

1

0

1

0

1

3LSBs

128

8

Step/Dir -Mode2.6

1

0

1

1

0

1LSB

Step/Dir -Mode2.7

1

0

1

1

1

LSB

Dir

3LSBs

PWM

10 bit

64

7

Commutation-

Mode3.0

1

1

0

0

0

10

Commutation-

Mode3.1

1

1

0

1

0

U(0º)

V(120º)

W(240º)

LSB

3 x 1

9

Commutation-

Mode3.2

1

1

1

0

0

10

Commutation-

Mode3.3

1

1

1

1

0

U’

(0º,

180º)

V’

(60º,

240º)

W’

(120º, 300º)

LSB

2 x 3

9

Note: Div1, Div0 and Index cannot be programmed in Mode 0:0

Zero Position Programming

Zero position programming is an OTP option that simplifies assembly of a system, as the magnet does not need to be

manually adjusted to the mechanical zero position. Once the assembly is completed, the mechanical and electrical

zero positions can be matched by software. Any position within a full turn can be defined as the permanent new

zero/index position.

For zero position programming, the magnet is turned to the mechanical zero position (e.g. the “off”-position of a rotary

switch) and the actual angular value is read.

This value is written into the OTP register bits Z9:Z0 (see Figure 14) and programmed as described in section 12.

This new absolute zero position is also the new Index pulse position for incremental output modes.

Note: The zero position value may also be modified before programming, e.g. to program an electrical zero position

that is 180° (half turn) from the mechanical zero position, just add 512 to the value read at the mechanical zero

position and program the new value into the OTP register.