Revision 1.0, 24-Oct-05

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General Description

The AS5035 is a contactless magnetic incremental encoder

with 64 quadrature pulses per revolution (8-bit resolution)

and index output.

Only a simple two-pole magnet, rotating over the center of

the chip is required. The magnet may be placed above or

below the IC.

The angular position of the magnet during assembly is not

critical as the AS5035 allows for a user programmable

zero-position to an accuracy of 0.35°

Two diagnostic outputs are provided to indicate an out-of-

range condition of the magnetic field as well as movement

of the magnet in Z-axis. In addition, a specific combination

of output states indicate a loss of power supply.

The AS5035 is available in a small 16pin SSOP package. It

can be operated at either 3.3V or 5V supplies.

Typical arrangement of AS5035 and magnet

Benefits

-

Complete system-on-chip, including analog front end

and digital signal processing

-

2-channel quadrature and index outputs provide an

alternative to optical encoders

-

User programmable Zero positioning by OTP allows

easy assembly of magnet

-

Diagnostic features for operation safety

-

Ideal for applications in harsh environments due to

magnetic sensing principle

-

Robust system, tolerant to magnet misalignment, air

gap variations, temperature variations and external

magnetic stray fields

Key Features

-

Full turn (360°) contactless angular position encoder

-

2 quadrature A/B outputs with 64 pulses per revolution

(ppr), 256 edges per revolution, 1.4° per step

-

Accurate user programmable zero position

-

Index output (one pulse per revolution)

-

Failure detection mode for magnet placement

monitoring and loss of power supply

-

Wide temperature range: - 40°C to + 125°C

-

Small lead-free package: SSOP 16 (5.3mm x 6.2mm)

Applications

-

Industrial applications:

- Robotics

- Replacement of optical encoders

- Flow meters

- Man-machine interface

-

Automotive applications:

- Power seat position sensing

- Power mirror position sensing

Pin Configuration

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

1

MagINCn

MagDECn

A

B

NC

Index

VSS

PROG

OTP_DO

OTP_CLK

CSn

NC

NC

NC

VDD3V3

VDD5V

AS5035 Pin configuration SSOP16

AS5035

Sin

Cos

Ang

Mag

MagINCn

MagDECn

Channel A

Channel B

Index

VDD5V

VDDV3V

OTP_CLK

OTP_DO

PROG

CSn

LDO 3.3V

Hall Array

&

Frontend

Amplifier

OTP

Zero

Position

DSP

Incremental

Decoder

AS5035 Block diagram

AS5035

8-bit (64 PPR) INCREMENTAL MAGNETIC ROTARY ENCODER

FACT SHEET