AS5145A AMSCO [austriamicrosystems AG], AS5145A Datasheet

AS5145A

Manufacturer Part Number

AS5145A

Description

12-Bit Programmable Magnetic Rotary Encoder

Manufacturer

AMSCO [austriamicrosystems AG]

Datasheet

1.AS5145A.pdf (36 pages)

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Company:

Bonase Electronics (HK) Co., Limited

Part Number:

AS5145A-HSSM

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AMS

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1 000

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Bonase Electronics (HK) Co., Limited

Part Number:

AS5145A-HSST

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AMS

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A S 5 1 4 5 / A S 5 1 4 5 A / A S 5 1 4 5 B

1 2 - B i t P r o g r a m m a b l e M a g n etic R otary Enco der

1 General Description

The AS5145 is a contact less magnetic rotary encoder for accurate

angular measurement over a full turn of 360 degrees.

It is a system-on-chip, combining integrated Hall elements, analog

front end and digital signal processing in a single device.

To measure the angle, 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 absolute angle measurement provides instant indication of the

magnet’s angular position with a resolution of 0.0879º = 4096

positions per revolution. This digital data is available as a serial bit

stream and as a PWM signal.

An internal voltage regulator allows the AS5145 to operate at either

3.3V or 5V supplies.

2 Key Features

Figure 1. AS5145 Automotive Rotary Encoder IC

D a t a S h e e t

- Serial interface

- Pulse width modulated (PWM) output

Contact less high resolution rotational position encoding over a

full turn of 360 degrees

Two digital 12 bit absolute outputs:

Mode_Index

VDD5V

LDO 3.3V

Hall Array

Front end

Amplifier

Mux

VDD3V3

Cos

Sin

Revision 1.10

OTP

DSP

AS5145

3 Applications

The device is ideal for industrial applications like contactless rotary

position sensing and robotics; automotive applications like steering

wheel position sensing, transmission gearbox encoder, head light

position control, torque sensing, valve position sensing and

replacement of high end potentiometers.

Three incremental outputs

Quadrature A/B (10 or 12 bit) and Index output signal (pre-

programmed versions available AS5145A for 10 bit and

AS5145B for 12 bit)

User programmable zero position

Failure detection mode for magnet placement, monitoring, and

loss of power supply

Red-Yellow-Green indicators display placement of magnet in Z-

axis

Serial read-out of multiple interconnected AS5145 devices

using Daisy Chain mode

Tolerant to magnet misalignment and gap variations

Wide temperature range: - 40ºC to +150ºC

Fully automotive qualified to AEC-Q100, grade 0

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

Ang

Mag

Incremental

Interface

Absolute

Interface

PWM

(SSI)

CSn

CLK

PWM

PDIO

MagINCn

DTEST1_A

MagDECn

DTEST2_B

1 - 36

Related parts for AS5145A

AS5145A Summary of contents

Page 1

... Amplifier Mode_Index www.austriamicrosystems.com/AS5145 Three incremental outputs Quadrature A/B ( bit) and Index output signal (pre- programmed versions available AS5145A for 10 bit and AS5145B for 12 bit) User programmable zero position Failure detection mode for magnet placement, monitoring, and loss of power supply Red-Yellow-Green indicators display placement of magnet in Z- ...

Page 2

AS5145 Data Sheet - Contents 1 General Description .................................................................................................................................................................. 2 Key Features............................................................................................................................................................................. 3 Applications............................................................................................................................................................................... 4 Pin Assignments ....................................................................................................................................................................... 4.1 Pin Descriptions.................................................................................................................................................................................... 4 5 Absolute Maximum Ratings ...................................................................................................................................................... 6 Electrical Characteristics........................................................................................................................................................... 6.1 Magnetic ...

Page 3

AS5145 Data Sheet - 9.7.7 Accuracy over Temperature ...................................................................................................................................................... 30 9.8 AS5145 Differences to AS5045.......................................................................................................................................................... 30 10 Package Drawings and Markings ......................................................................................................................................... 10.1 Recommended PCB Footprint.......................................................................................................................................................... 33 11 Ordering Information ............................................................................................................................................................. www.austriamicrosystems.com/AS5145 ...

Page 4

AS5145 Data Sheet - Pin Assignments Figure 2. Pin Assignments (Top View) MagINCn MagDECn DTest1_A DTest1_B Mode_Index 4.1 Pin Descriptions The following SSOP16 shows the ...

Page 5

AS5145 Data Sheet - Table 1. Pin Descriptions Pin Number Pin Name 3V3 Pin 1 and 2 ...

Page 6

AS5145 Data Sheet - Absolute Maximum Ratings Stresses beyond those listed in Table 2 may cause permanent ...

Page 7

AS5145 Data Sheet - Electrical Characteristics T = -40 to +150º ...

Page 8

AS5145 Data Sheet - Table 3. Electrical Characteristics Symbol Parameter I Output current O DC ...

Page 9

AS5145 Data Sheet - Table 4. Magnetic Input Specification Symbol Parameter Disp Displacement radius Ecc ...

Page 10

AS5145 Data Sheet - Figure 3. Integral and Differential Non-Linearity Example α 10bit code 1023 ...

Page 11

AS5145 Data Sheet - Timing Characteristics T = -40 to +150 º 3.0 to 3.6V ...

Page 12

AS5145 Data Sheet - Detailed Description The AS5145 is manufactured in a CMOS standard process and uses a spinning current ...

Page 13

AS5145 Data Sheet - 8.1.1 Synchronous Serial Interface (SSI) Figure 5. Synchronous Serial Interface with Absolute Angular Position Data T CLK/2 ...

Page 14

AS5145 Data Sheet - Z-axis Range Indication (Push Button Feature, Red/Yellow/Green Indicator). movement and distance of the magnet in the Z-direction. ...

Page 15

AS5145 Data Sheet - Incremental Power-up Lock Option. After power-up, the incremental outputs can optionally be locked or unlocked, depending on ...

Page 16

AS5145 Data Sheet - Incremental Output Validity. During power on the incremental output is kept stable high until the offset compensation ...

Page 17

AS5145 Data Sheet - Figure 10. Daisy Chain Mode Data Transfer CSn T CLK/2 t CLK FE 1 CLK D11 D10 ...

Page 18

AS5145 Data Sheet - 8.2.1 Changing the PWM Frequency The PWM frequency of the AS5145 can be divided by two by ...

Page 19

AS5145 Data Sheet - Application Information The benefits of AS5145 are as follows: Complete system-on-chip Flexible system ...

Page 20

AS5145 Data Sheet - 9.1.2 OTP Memory Assignment Table 13. OTP Bit Assignment Bit 51 PWMhalfEN_Index width 50 ...

Page 21

AS5145 Data Sheet - CCW: Counter Clockwise Bit ccw=0 – angular value increases in clockwise direction ccw=1 ...

Page 22

AS5145 Data Sheet - 9.1.6 Redundant Programming Option In addition to the regular programming, a redundant programming option ...

Page 23

AS5145 Data Sheet - 9.2 Alignment Mode The alignment mode simplifies centering the magnet over the center of ...

Page 24

AS5145 Data Sheet - Figure 17. Connections for 5V / 3.3V Supply Voltages 5V Operation 2.2µF VDD3V3 100nF ...

Page 25

AS5145 Data Sheet - Figure 18. Typical Magnet (6x3mm) and Magnetic Field Distribution 9.4.1 Physical Placement of the ...

Page 26

AS5145 Data Sheet - 9.4.2 Magnet Placement The magnet’s center axis should be aligned within a displacement radius ...

Page 27

AS5145 Data Sheet - The angular displacement (Q) of the magnetic source with reference to the Hall sensor ...

Page 28

AS5145 Data Sheet - Figure 22. Example of Linearity Error Over XY Misalignment ° 3 ...

Page 29

AS5145 Data Sheet - 9.7.2 Transition Noise Transition noise is defined as the jitter in the transition between ...

Page 30

AS5145 Data Sheet - 9.7.5 Internal Timing Tolerance The AS5145 does not require an external ceramic resonator or ...

Page 31

AS5145 Data Sheet - Table 15. Difference Between AS5145 and AS5045 Building Block PWM output: frequency selectable by ...

Page 32

AS5145 Data Sheet - Package Drawings and Markings The device is available in ...

Page 33

AS5145 Data Sheet - 10.1 Recommended PCB Footprint Figure 25. PCB Footprint Table 17. ...

Page 34

AS5145 Data Sheet - Revision History Table 18. Revision History Revision Date Number May 30, 2008 1.1 July 23, 2008 July 25, 2008 1.2 August ...

Page 35

... AS5145A-HSSU Pre-programmed 10 bit incremental AS5145B-HSSU Pre-programmed 12 bit incremental 1. The pre-programmed devices AS5145A-HSSU and AS5145B-HSSU are available on request. Note: All products are RoHS compliant and Pb-free. Buy our products or get free samples online at ICdirect: For further information and requests, please contact us or find your local distributor at http://www ...

Page 36

AS5145 Data Sheet - Copyrights Copyright © 1997-2009, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, ...

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