AS5311

Data Sheet

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Revision 1.01

3 - 23

4

Table of Contents

1

General Description ...................................................................................................................... 1

2

Key Features ................................................................................................................................ 1

3

Applications.................................................................................................................................. 1

4

Table of Contents ......................................................................................................................... 3

5

Pinout .......................................................................................................................................... 5

5.1

Pin Assignments ..................................................................................................................... 5

5.2

Pin Description ....................................................................................................................... 5

6

Electrical Characteristics............................................................................................................... 6

6.1

Absolute Maximum Ratings ..................................................................................................... 6

6.2

Operating Conditions .............................................................................................................. 7

6.3

DC Characteristics for Digital Inputs and Outputs ..................................................................... 7

6.3.1

CMOS Schmitt-Trigger Inputs: CLK, CSn (CSn = internal Pull-up) ....................................... 7

6.3.2

CMOS Output Open Drain: MagINCn, MagDECn ................................................................ 7

6.3.3

CMOS Output: PWM ......................................................................................................... 7

6.3.4

Tristate CMOS Output: DO ................................................................................................ 8

6.4

Magnetic Input Specification....................................................................................................8

6.5

Electrical System Specifications .............................................................................................. 8

6.6

Timing Characteristics ............................................................................................................ 9

6.6.1

Synchronous Serial Interface (SSI) .................................................................................... 9

6.6.2

Pulse Width Modulation Output........................................................................................ 10

7

Detailed Description.................................................................................................................... 10

7.1

Incremental Outputs.............................................................................................................. 11

7.1.1

Incremental Power-up Lock Option .................................................................................. 11

7.2

Incremental Output Hysteresis............................................................................................... 12

7.3

Synchronous Serial Interface (SSI) ........................................................................................ 12

7.3.1

Data Contents ................................................................................................................ 13

7.4

Absolute Output Jitter and Hysteresis .................................................................................... 14

7.4.1

Adding a Digital Hysteresis ............................................................................................. 14

7.4.2

Implementing Digital Filtering .......................................................................................... 14

7.5

Z-axis Range Indication (“Red/Yellow/Green” Indicator) .......................................................... 14

8

Pulse Width Modulation (PWM) Output ........................................................................................ 15

9

3.3V / 5V Operation .................................................................................................................... 15

10

Magnet Specifications .............................................................................................................. 16

10.1

Magnetization .................................................................................................................... 16

10.2

Position of the Index Pulse ................................................................................................. 17

10.3

Mounting the Magnet ......................................................................................................... 17

10.3.1

Vertical Distance ......................................................................................................... 17

10.3.2

Alignment of Multi-pole Magnet and IC.......................................................................... 17

10.3.3

Lateral stroke of Multi-pole Strip Magnets ..................................................................... 17

11

Measurement Data Example ..................................................................................................... 19