AS5145A datasheet, PDF - EEWORLD Datasheet

AS5145A: Description12-Bit Programmable Magnetic Rotary Encoder; File Size799KB，37 Pages; ManufacturerAMS; Websitehttps://ams.com/zh

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AS5145A Overview

12-Bit Programmable Magnetic Rotary Encoder

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AS5145/AS5145-I10/AS5145-I12

1 2 - B i t P r o g r a m m a b l e M a g n e t i c R o ta r y E n c o d e r

D a ta S he e t

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.

Figure 1. Arrangement of AS5145 and Magnet

2 Key Features

Contact less high resolution rotational position

encoding over a full turn of 360 degrees

Two digital 12 bit absolute outputs:

- Serial interface

- Pulse width modulated (PWM) output

Three incremental outputs

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

signal (pre-programmed versions available AS5145-

I10/AS5145-I12)

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)

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.

VDD3V3

MagINCn

MagDECn

PWM

Interface

Sin

Hall Array

Front end

Amplifier

Cos

DSP

Mag

Ang

Absolute

Interface

(SSI)

CSn

CLK

OTP

Mux

Mode_Index

Incremental

Interface

PDIO

DTEST1_A

DTEST2_B

PWM

Figure 2. Block Diagram

VDD5V

LDO 3.3V

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Revision 1.6

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AS5145

Data Sheet - A p p l i c a t i o n s

Contents

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

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

3 Applications ............................................................................................................................................1

4 Pin Assignments ....................................................................................................................................4

4.1 Pin Description ..................................................................................................................................................4

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

6 Electrical Characteristics.......................................................................................................................7

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

6.2 System Specifications .......................................................................................................................................9

7 Timing Characteristics ......................................................................................................................... 11

8 Detail Description .................................................................................................................................12

8.1 Mode_Index Pin ..............................................................................................................................................12

8.1.1

8.1.2

8.1.3

8.1.4

8.1.5

Synchronous Serial Interface (SSI) .......................................................................................................13

Incremental Mode .................................................................................................................................15

Sync Mode ............................................................................................................................................16

Sin/Cosine Mode ...................................................................................................................................16

Daisy Chain Mode .................................................................................................................................17

8.2 Pulse Width Modulation (PWM) Output...........................................................................................................17

8.2.1 Changing the PWM Frequency .............................................................................................................18

8.3 Analog Output .................................................................................................................................................19

9 Application Information .......................................................................................................................20

9.1 Programming the AS5145 ...............................................................................................................................20

9.1.1

9.1.2

9.1.3

9.1.4

9.1.5

9.1.6

9.1.7

Zero Position Programming ..................................................................................................................20

OTP Memory Assignment .....................................................................................................................21

User selectable settings ........................................................................................................................21

OTP Default Setting ..............................................................................................................................22

Redundancy ..........................................................................................................................................22

Redundant programming option............................................................................................................23

OTP register entry and exit condition ....................................................................................................23

9.2 Alignment Mode ..............................................................................................................................................23

9.3 3.3V / 5V Operation .........................................................................................................................................24

9.4 Selecting Proper Magnet .................................................................................................................................25

9.4.1 Physical Placement of the Magnet ........................................................................................................26

9.4.2 Magnet Placement ................................................................................................................................27

9.5 Simulation Modeling ........................................................................................................................................27

9.6 Failure Diagnostics ..........................................................................................................................................28

9.6.1 Magnetic Field Strength Diagnosis .......................................................................................................28

9.6.2 Power Supply Failure Detection ............................................................................................................28

9.7 Angular Output Tolerances ..............................................................................................................................28

9.7.1

9.7.2

9.7.3

9.7.4

9.7.5

9.7.6

Accuracy ...............................................................................................................................................28

Transition Noise ....................................................................................................................................30

High Speed Operation...........................................................................................................................30

Propagation Delays ...............................................................................................................................31

Internal Timing Tolerance .....................................................................................................................31

Temperature..........................................................................................................................................31

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Revision 1.6

2 - 37

AS5145

Data Sheet - P i n A s s i g n m e n t s

Table 1. Pin Description

Pin Number

Pin Name

3V3

Description

3V-Regulator Output, internally regulated from V

5V. Connect to V

for 3V supply voltage. Do not load externally.

Positive Supply Voltage, 3.0 to 5.5 V

Pin 1 and 2 are the magnetic field change indicators, MagINCn and MagDECn (magnetic field strength increase or

decrease through variation of the distance between the magnet and the device). These outputs can be used to detect

the valid magnetic field range. Furthermore those indicators can also be used for contact-less push-button

functionality.

Pin 3 and 4 are multi function pins for sync mode, sin/cosine mode and incremental mode.

Pin 6 Mode_Index allows switching between filtered (slow) and unfiltered (fast mode). In incremental mode, the pin

changes from input to output and provides the index pulse information. A change of the Mode during operation is not

allowed. The setup must be constant during power up and during operation.

Pins 7, 15, and 16 are supply pins, pins 5, 13, and 14 are for internal use and must not be connected.

Pin 8 (PDIO) is used to program the zero-position into the OTP(see

page 20).

This pin is also used as digital input to

shift serial data through the device in Daisy Chain configuration,

(see page 15).

Pin 11 Chip Select (CSn; active low) selects a device within a network of AS5145 encoders and initiates serial data

transfer. A logic high at CSn puts the data output pin (DO) to tri-state and terminates serial data transfer. This pin is

also used for alignment mode

(see Alignment Mode on page 23)

and programming mode

(see Programming the

AS5145 on page 20).

Pin 12 allows a single wire output of the 12-bit absolute position value. The value is encoded into a pulse width

modulated signal with 1µs pulse width per step (1µs to 4096µs over a full turn). By using an external low pass filter, the

digital PWM signal is converted into an analog voltage, e.g. for making a direct replacement of potentiometers

possible.

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Revision 1.6

5 - 37

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