AS5045-ASST_技术文档

AS5045

12-Bit Programmable Magnetic Rotary

Position Sensor

The AS5045 is a contactless magnetic position sensor for

accurate angular measurement over a full turn of 360°. It is a

system-on-chip, combining integrated Hall elements, analog

front end and digital signal processing in a single device.

General Description

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

0.0879° = 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 AS5045 to operate at

either 3.3 V or 5 V supplies.

Ordering Information and Content Guide appear at end of

datasheet.

Key Benefits & Features

The benefits and features of AS5045, 12-Bit Programmable

Magnetic Rotary Position Sensor are listed below:

Figure 1:

Added Value of Using AS5045

Benefits

Features

• Highest reliability and durability in harsh

environments

• Contactless absolute angle position measurement

• User programmable zero position

• Great flexibility during assembly

• Operation safety

• Diagnostic modes for magnet detection and power supply

loss

• Lower material cost (no magnetic

shielding needed)

• Immune to external magnetic stray fields

• Two digital 12-bit absolute outputs:

• Serial interface and

• Pulse width modulated (PWM) output

• Failure detection mode for magnet placement monitoring

and loss of power supply

• “Red-Yellow-Green” indicators display placement of magnet

in Z-axis

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AS5045 − General Description

• Serial read-out of multiple interconnected AS5045 devices

using Daisy Chain mode

• Tolerant to magnet misalignment and airgap variations

• Wide temperature range: - 40ºC to 125ºC

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

Applications

The AS5045 is ideal for industrial applications like

• Robotics,

• Stepper motor control,

• RC servo control and

• Replacement of high-end potentiometers.

Block Diagram

The functional blocks of this device are shown below:

Figure 2:

AS5045 Block Diagram

VDD3V3

MagINCn

MagDECn

VDD5V

LDO 3.3V

PWM

Interface

PWM

Sin

Ang

Mag

DO

DSP

Absolute

Interface

(SSI)

Cos

Hall Array

&

Frontend

Amplifier

CSn

CLK

OTP

Register

Prog_DI

AS5045

Mode

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AS5045 − Pin Assignment

Pin Assignment

Figure 3:

Pin Assignment (Top View)

1

16

15

MagINCn

VDD5V

VDD3V3

NC

MagDECn

NC

2

3

4

14

13

12

11

NC

5

6

NC

PWM

CSn

Mode

7

8

VSS

10

9

CLK

DO

Prog_DI

Pin Description

Figure 4 shows the description of each pin of the standard

SSOP16 package (Shrink Small Outline Package, 16 leads, body

size: 5.3mm x 6.2mmm; see Figure 3).

Pins 7, 15 and 16 supply pins, pins 3, 4, 5, 6, 13 and 14 are for

internal use and must not be connected.

Pins 1 and 2 MagINCn and MagDECn are the magnetic field

change indicators (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 6 Mode allows switching between filtered (slow) and

unfiltered (fast mode). This pin must be tied to VSS or VDD5V,

and must not be switched after power up. See Mode Input Pin.

Pin 8 Prog is used to program the zero-position into the OTP.

See Zero Position Programming.

This pin is also used as digital input to shift serial data through

the device in Daisy Chain configuration. See Daisy Chain Mode.

Pin 11 Chip Select (CSn; active low) selects a device within a

network of AS5045 magnetic position sensors 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 and programming mode (see

Figure 27).

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AS5045 − Pin Assignment

Pin 12 PWM allows a single-wire output of the 10-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, making a direct

replacement of potentiometers possible.

Figure 4:

Pin Description

Number

Pin Name

Pin Type

Description

Magnet Field Magnitude INCrease; active low, indicates

a distance reduction between the magnet and the

device surface (see Figure 16).

1

MagINCn

MagDECn

Digital output open

drain

Magnet Field Magnitude DECrease; active low,

indicates a distance increase between the device and

the magnet see Figure 16).

2

3

4

5

NC

-

Must be left unconnected

Select between slow (low, VSS) and fast (high, VDD5V)

mode. Internal pull-down resistor. Must be hard-wired

on the PCB in application.

6

7

8

Mode

VSS

-

Supply pin

Negative Supply Voltage (GND)

OTP Programming Input and Data Input for Daisy Chain

mode. Internal pull-down resistor (~74kΩ). Connect to

VSS if not used

Digital input

pull-down

Prog_DI

Digital output /

tri-state

9

DO

CLK

Data Output of Synchronous Serial Interface

Clock Input of Synchronous Serial Interface;

Digital input,

Schmitt-Trigger input Schmitt-Trigger input

10

11

12

Digital input pull-up,

Schmitt-Trigger input pull-up resistor (~50kΩ)

Chip Select, active low; Schmitt-Trigger input, internal

CSn

PWM

Pulse Width Modulation of approx. 244Hz; 1μs/step

(optional 122Hz; 2μs/step)

Digital output

13

14

NC

-

Must be left unconnected

3V-Regulator Output, internally regulated from VDD5V.

Connect to VDD5V for 3V supply voltage. Do not load

externally.

15

16

VDD3V3

VDD5V

Supply pin

Positive Supply Voltage, 3.0 to 5.5 V

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AS5045 − Absolute Maximum Ratings

Stresses beyond those listed in Absolute Maximum Ratings may

cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any

other conditions beyond those indicated in Electrical

Characteristics is not implied. Exposure to absolute maximum

rating conditions for extended periods may affect device

reliability.

Absolute Maximum Ratings

Figure 5:

Absolute Maximum Ratings

Parameter

Min

Max

Units

Comments

Electrical Parameters

DC supply voltage at pin VDD5V

-0.3

7

5

V

DC supply voltage at pin

VDD3V3

VDD5V

+0.3

Input pin voltage

-0.3

V

Except VDD3V3

Input current (latchup immunity)

-100

100

mA

EIA/JESD78 Class II Level A

JESD22-A114E

Electrostatic Discharge

kV

Electrostatic discharge

2

Temperature Ranges and Storage Conditions

Storage temperature

-55

150

ºC

Min -67ºF; Max 302ºF

The reflow peak soldering temperature

(body temperature) specified is in

accordance with IPC/JEDEC J-STD-020

“Moisture/Reflow Sensitivity Classification

for Non-Hermetic Solid State Surface

Mount Devices”.

Package body temperature

260

ºC

The lead finish for Pb-free leaded

packages is matte tin (100% Sn).

Relative humidity

non-condensing

5

85

%

Represents a maximum floor life time of

168h

Moisture sensitivity level (MSL)

3

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AS5045 − Electrical Characteristics

T

= -40°C to 125°C, VDD5V = 3.0V to 3.6V (3V operation)

Electrical Characteristics

AMB

VDD5V = 4.5V to 5.5V (5V operation), unless otherwise noted.

Figure 6:

Electrical Characteristics

Symbol

Parameter

Condition

Operating Conditions

-40°F to 257°F

Min

Typ

Max

Units

T

Ambient temperature

Supply current

-40

125

21

°C

AMB

I

16

mA

supp

Supply voltage at pin

VDD5V

VDD3V3

VDD5V

4.5

3.0

5.0

5.5

3.6

5V operation

V

Voltage regulator output

voltage at pin VDD3V3

3.3

Supply voltage at pin

VDD5V

3.3V operation

(pin VDD5V and VDD3V3

connected)

Supply voltage at pin

VDD3V3

DC Characteristics CMOS Schmitt-Trigger Inputs: CLK, CSn (CSn = Internal Pull-Up)

0.7 *

VDD5V

V

High level input voltage

Low level input voltage

Normal operation

V

IH

0.3 *

VDD5V

V

IL

V

Schmitt Trigger hysteresis

Input leakage current

1

V

Ion- Ioff

I

CLK only

-1

1

μA

LEAK

Pull-up low level input

current

I

CSn only, VDD5V: 5.0V

-30

-100

μA

IL

DC Characteristics CMOS / Program Input: Prog

0.7 *

VDD5V

V

High level input voltage

VDD5V

V

IH

Refer to programming

conditions (Figure 10)

VPROG

High level input voltage

During programming

VDD5V: 5.5V

0.3 *

VDD5V

V

Low level input voltage

High level input current

V

IL

I

30

100

μA

IL

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AS5045 − Electrical Characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Units

DC Characteristics CMOS Output Open Drain: MagINCn, MagDECn

Low level output voltage

V

VSS+0.4

V

OL

VDD5V: 4.5V

VDD5V: 3V

4

2

1

I

Output current

mA

μA

O

I

Open drain leakage current

OZ

DC Characteristics CMOS Output: PWM

VDD5V-

V

High level output voltage

V

OH

0.5

V

Low level output voltage

VSS+0.4

OL

VDD5V: 4.5V

VDD5V: 3V

4

2

I

Output current

mA

O

DC Characteristics Tri-state CMOS Output: DO

VDD5V-

V

High level output voltage

V

OH

0.5

V

Low level output voltage

Output current

VSS+0.4

OL

VDD5V: 4.5V

VDD5V: 3V

4

2

1

I

mA

μA

O

I

Tri-state leakage current

OZ

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AS5045 − Electrical Characteristics

Magnetic Input Specification

Two-pole cylindrical diametrically magnetized source:

Figure 7:

Magnetic Input Specification

Symbol

Parameter

Conditions

Min Typ Max Units

d

Diameter

Thickness

Recommended magnet:

Ø 6mm x 2.5mm for

cylindrical magnets

4

6

mm

mag

t

2.5

mag

Required vertical component

of the magnetic field strength

on the die’s surface,

measured along a concentric

circle with a radius of 1.1mm

Magnetic input field

amplitude

B

45

75

mT

pk

B

Magnetic offset

Constant magnetic stray field

Including offset gradient

10

mT

%

off

Field non-linearity

5

146 rpm @ 4096

positions/rev.; fast mode

2.44

Input frequency

(rotational speed of

magnet)

f

Hz

mag_abs

36.6rpm @ 4096

positions/rev.; slow mode

0.61

0.25

100

Maximum offset between

defined device center and

magnet axis

Disp

Ecc

Displacement radius

Eccentricity

mm

μm

Eccentricity of magnet center

to rotational axis

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AS5045 − Electrical Characteristics

Electrical System Specifications

Figure 8:

Input Specification

Symbol

Parameter

Conditions

Min

Typ

Max

Units

RES

Resolution

0.088 deg

12

bit

Maximum error with respect to

the best line fit. Centered

magnet without calibration,

INL

0.5

0.9

opt

T

= 25°C

AMB

Integral non-linearity

(optimum)

deg

Maximum error with respect to

the best line fit. Centered

magnet without calibration,

INL

temp

T

= -40°C to 125°C

AMB

Best line fit = (Err

– Err ) / 2

min

max

Over displacement tolerance

with 6mm diameter magnet,

without calibration,

INL

Integral non-linearity

1.4

deg

T

= -40 to 125°C

°C

AMB

Differential

non-linearity

DNL

TN

12-bit, No missing codes

0.044

0.06

1 sigma, fast mode

(MODE = 1)

deg

RMS

Transition noise

1 sigma, slow mode (MODE=0

or open)

0.03

Power-on reset

thresholds:

On voltage; 300mV typ.

hysteresis

V

ON

1.37

1.08

2.2

1.9

2.9

DC supply voltage 3.3V

(VDD3V3)

V

Power-on reset

thresholds: Off voltage;

300mV typ. hysteresis

2.6

20

OFF

Fast mode (Mode = 1);

until status bit OCF = 1

t

Power-up time

ms

μs

PwrUp

Slow mode (Mode = 0 or open);

until OCF = 1

80

96

System propagation

delay absolute output :

delay of ADC, DSP and

absolute interface

Fast mode (MODE=1)

t

delay

Slow mode (MODE=0 or open)

384

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AS5045 − Electrical Characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Units

T

= 25°C,

AMB

2.48

2.61

2.74

slow mode (MODE=0 or open)

Internal sampling rate

for absolute output:

f

kHz

S

T

= -40°C to 125°C,

AMB

2.35

9.90

9.38

2.61

10.42

2.87

10.94

11.46

1

slow mode (MODE=0 or open)

T

= 25°C, fast mode

AMB

(MODE = 1)

Internal sampling rate

for absolute output

f

kHz

S

T

= -40°C to 125°C,

AMB

fast mode (MODE = 1)

Maximum clock frequency to

read out serial data

CLK

Read-out frequency

MHz

Figure 9:

Integral and Differential Non-Linearity (Example)

12bit code

α

4095

Actual curve

Ideal curve

TN

2

1

DNL+1LSB

INL

0.09°

0

2048

0

°

180°

[degrees]

°

0

360

α

Integral Non-Linearity (INL) is the maximum deviation between

actual position and indicated position.

Differential Non-Linearity (DNL) is the maximum deviation of

the step length from one position to the next.

Transition Noise (TN) is the repeatability of an indicated

position.

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AS5045 − Timing Characteristics

Timing Characteristics

Figure 10:

Timing Characteristics

Symbol

Parameter

Conditions

Synchronous Serial Interface (SSI)

Time between falling edge of

Min Typ Max Units

Data output activated

(logic high)

t

CSn and data output

activated

100

ns

DO active

Time between falling edge of

CSn and first falling edge of

CLK

First data shifted to

output register

t

500

CLK FE

Rising edge of CLK shifts out

one bit at a time

T

Start of data output

Data output valid

Data output tristate

500

357

ns

CLK / 2

Time between rising edge of

CLK and data output valid

t

375

394

100

DO valid

After the last bit DO changes

back to “tristate”

t

DO tristate

CSn = high; To initiate

read-out of next angular

position

t

Pulse width of CSn

Read-out frequency

500

>0

ns

CSn

Clock frequency to read out

serial data

f

1

MHz

CLK

Pulse Width Modulation Output

Signal period = 4097μs 5%

232

244

256

T

at

= 25°C

AMB

f

PWM frequency

Hz

PWM

Signal period = 4097μs 10%

220

244

1

268

T

at

= -40 to 125°C

AMB

PW

Minimum pulse width

Maximum pulse width

Position 0d; Angle 0°

0.95

1.05

μs

MIN

Position 4095d; Angle

359.91°

PW

3891 4096 4301

MAX

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AS5045 − Timing Characteristics

Symbol

Parameter

Conditions

Min Typ Max Units

Programming Conditions

Time between rising edge at

Prog pin and rising edge of

CSn

Programming enable

time

t

2

μs

Prog enable

t

Write data start

2

250

3

μs

ns

μs

Data in

Write data at the rising edge

t

Write data valid

Data in valid

of CLK

PROG

t

Load programming data

Load PROG

Rise time of V

before

PROG

t

0

PrgR

CLK

PROG

Hold time of V

after

PROG

t

0

5

μs

PrgH

CLK

PROG

Write data –

programming CLK

Ensure that V

with rising edge of CLK

is stable

PROG

CLK

250

2.2

kHz

μs

PROG

During programming; 16

clock cycles

t

CLK pulse width

1.8

2

PROG

Programmed data is

available after next

power-on

Hold time of V

programming

after

PROG

t

μs

PROG finished

Programming voltage,

pin PROG

Must be switched off after

zapping

V

7.3

0

7.4

7.5

1

V

PROG

Programming voltage off Line must be discharged to

level

V

ProgOff

this level

I

Programming current

Analog read CLK

During programming

Analog Readback mode

130

100

mA

kHz

PROG

CLK

Aread

Programmed Zener

voltage (log.1)

V

100

mV

V

programmed

V

-V

during Analog

Ref PROG

Readback mode (see Analog

Readback Mode)

Unprogrammed Zener

voltage (log. 0)

V

1

unprogrammed

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AS5045 − Detailed Description

The AS5045 is manufactured in a CMOS standard process and

uses a spinning current Hall technology for sensing the

magnetic field distribution across the surface of the chip. The

integrated Hall elements are placed around the center of the

device and deliver a voltage representation of the magnetic

field at the surface of the IC.

Detailed Description

Through Sigma-Delta Analog / Digital Conversion and Digital

Signal-Processing (DSP) algorithms, the AS5045 provides

accurate high-resolution absolute angular position

information. For this purpose a Coordinate Rotation Digital

Computer (CORDIC) calculates the angle and the magnitude of

the Hall array signals. The DSP is also used to provide digital

information at the outputs MagINCn and MagDECn that

indicate movements of the used magnet towards or away from

the device’s surface. A small low cost diametrically magnetized

(two-pole) standard magnet provides the angular position

information (see Figure 30).

The AS5045 senses the orientation of the magnetic field and

calculates a 12-bit binary code. This code can be accessed via a

Synchronous Serial Interface (SSI). In addition, an absolute

angular representation is given by a Pulse Width Modulated

signal at pin 12 (PWM). This PWM signal output also allows the

generation of a direct proportional analogue voltage, by using

an external Low-Pass-Filter. The AS5045 is tolerant to magnet

misalignment and magnetic stray fields due to differential

measurement technique and Hall sensor conditioning circuitry.

Figure 11:

Typical Arrangement of AS5045 and Magnet

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AS5045 − Detailed Description

Mode Input Pin

The mode input pin activates or deactivates an internal filter

that is used to reduce the analog output noise. Activating the

filter (Mode pin = LOW) provides a reduced output noise of 0.03°

rms. At the same time, the output delay is increased to 384μs.

This mode is recommended for high precision, low speed

applications.

Deactivating the filter (Mode pin = HIGH) reduces the output

delay to 96μs and provides an output noise of 0.06° rms. This

mode is recommended for higher speed applications.

The MODE pin should be set at power-up. A change of the mode

during operation is not allowed.

Switching the Mode pin affects the following parameters.

Figure 12:

Slow and Fast Mode Parameters 12-Bit Absolute Angular Position Output

Slow Mode

Parameter

Fast Mode

(Mode = Low)

2.61 kHz (384 μs)

≤ 0.03° rms

(Mode = High, VDD5V)

10.42 kHz (96μs)

≤ 0.06° rms

Sampling rate

Transition noise (1 sigma)

Output delay

384μs

96μs

Max. speed @ 4096 samples/rev.

Max. speed @ 1024 samples/rev.

Max. speed @ 256 samples/rev.

Max. speed @ 64 samples/rev.

38 rpm

153 rpm

610 rpm

2441 rpm

153 rpm

610 rpm

2441 rpm

9766 rpm

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AS5045 − Detailed Description

Synchronous Serial Interface (SSI)

Figure 13:

Synchronous Serial Interface with Absolute Angular Position Data

t

CLKFE

CSn

T

CLK/2

t

CSn

t

CLKFE

1

8

18

CLK

DO

Mag Mag Even

INC DEC PAR

D11

D6

D5

D10 D9 D8

D7

D11

D4 D3 D2 D1 D0 OCF

COF LIN

t

DO valid

t

DO Tristate

t

DO active

Angular Position Data

Status Bits

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AS5045 − Detailed Description

If CSn changes to logic low, Data Out (DO) will change from high

impedance (tri-state) to logic high and the read-out will be

initiated.

• After a minimum time t

data is latched into the

CLK FE,

output shift register with the first falling edge of CLK.

• Each subsequent rising CLK edge shifts out one bit of data.

• The serial word contains 18 bits, the first 12 bits are the

angular information D[11:0], the subsequent 6 bits

contain system information, about the validity of data

such as OCF, COF, LIN, Parity and Magnetic Field status

(increase/decrease).

• A subsequent measurement is initiated by a “high” pulse

at CSn with a minimum duration of t

CSn.

Data Content

D11:D0 – absolute angular position data (MSB is clocked out

first)

OCF – (Offset Compensation Finished), logic high indicates the

finished Offset Compensation Algorithm

COF – (CORDIC Overflow), logic high indicates an out of range

error in the CORDIC part. When this bit is set, the data at D9:D0

is invalid. The absolute output maintains the last valid angular

value. This alarm may be resolved by bringing the magnet

within the X-Y-Z tolerance limits.

LIN – (Linearity Alarm), logic high indicates that the input field

generates a critical output linearity. When this bit is set, the data

at D9:D0 may still be used, but can contain invalid data. This

warning may be resolved by bringing the magnet within the

X-Y-Z tolerance limits.

Even Parity – Bit for transmission error detection of bits 1 …17

(D11 …D0, OCF, COF, LIN, MagINC, MagDEC). Placing the

magnet above the chip, angular values increase in clockwise

direction by default.

Data D11:D0 is valid, when the status bits have the following

configurations.

Figure 14:

Status Bit Outputs

OCF

COF

LIN

MagINC

MagDEC

Parity

0

1

0

1

0

Even checksum of bits

1:15

1

0

(1)

1

Note(s):

1. MagInc=MagDec=1 is only recommended in YELLOW mode (see Figure 16).

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AS5045 − Detailed Description

Z-Axis Range Indication (Push Button Feature,

Red/Yellow/Green Indicator)

The AS5045 provides several options of detecting movement

and distance of the magnet in the Z-direction. Signal indicators

MagINCn and MagDECn are available both as hardware pins

(pins 1 and 2) and as status bits in the serial data stream.

Additionally, an OTP programming option is available with bit

MagCompEn (see Figure 23) that enables additional features.

In the default state, the status bits MagINC, MagDec and pins

MagINCn, MagDECn have the following function.

Figure 15:

Magnetic Field Strength Variation Indicator

Status Bits

Hardware Pins

OTP: Mag CompEn = 0 (default)

Description

MagINC MagDEC MagINCn MagDECn

No distance change

Magnetic input field OK (in range, ~45mT to 75mT)

0

1

Off

On

Distance increase; pull-function. This state is

dynamic and only active while the magnet is

moving away from the chip.

Distance decrease; push- function. This state is

dynamic and only active while the magnet is

moving towards the chip.

1

0

1

On

Off

On

Magnetic field is ~<45mT or >~75mT. It is still

possible to operate the AS5045 in this range, but

not recommended

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AS5045 − Detailed Description

When bit MagCompEn is programmed in the OTP, the function

of status bits MagINC, MagDec and pins MagINCn, MagDECn is

changed to the following function.

Figure 16:

Magnetic Field Strength Red-Yellow-Green Indicator (OTP Option)

OTP: Mag CompEn = 1

(Red-Yellow-Green Programming Option)

Status Bits

Hardware Pins

Mag

INC

Mag

DEC

Mag

INCn

Mag

DECn

LIN

Description

No distance change

Magnetic input field OK (GREEN range, ~45mT to 75mT)

0

1

0

1

0

Off

On

Off

YELLOW range: magnetic field is ~ 25mT to 45mT or

~75mT to 135mT. The AS5045 may still be operated in

this range, but with slightly reduced accuracy.

0

1

RED range: magnetic field is ~<25mT or >~135mT. It is

still possible to operate the AS5045 in the red range,

but not recommended.

1

On

All other combinations

n/a

Not available

Note(s):

1. Pin 1 (MagINCn) and pin 2 (MagDECn) are active low via open drain output and require an external pull-up resistor. If the magnetic

field is in range, both outputs are turned off.

The two pins may also be combined with a single pull-up

resistor. In this case, the signal is high when the magnetic field

is in range. It is low in all other cases (see Figure 15 and

Figure 16).

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AS5045 − Detailed Description

Daisy Chain Mode

The Daisy Chain mode allows connection of several AS5045’s in

series, while still keeping just one digital input for data transfer

(see “Data IN” in Figure 17). This mode is accomplished by

connecting the data output (DO; pin 9) to the data input (PROG;

pin 8) of the subsequent device. An RC filter must be

implemented between each PROG pin of device n and DO pin

of device n+1, to prevent then magnetic position sensors to

enter the alignment mode, in case of ESD discharge, long

cables, not conform signal levels or shape. Using the values

R=100R and C=1nF allow a max. CLK frequency of 1MHz on the

whole chain. The serial data of all connected devices is read

from the DO pin of the first device in the chain. The length of

the serial bit stream increases with every connected device, it

is n * (18+1) bits: For e.g., 38 bit for two devices, 57 bit for three

devices, etc.

The last data bit of the first device (Parity) is followed by a

dummy bit and the first data bit of the second device (D11), etc.

(see Figure 18).

Figure 17:

Daisy Chain Hardware Configuration

CSn

CLK

DO

CSn

CLK

DO

CSn

CLK

DO

CSn

CLK

DI

100R

1nF

GND

100R

1nF

PROG

GND

MCU

AS5045

Figure 18:

Daisy Chain Mode Data Transfer

CSn

T

CLK/2

t

CLK FE

1

8

D

3

18

1

2

CLK

DO

Mag Mag

INC DEC

Even

PAR

D9

D11 D10

D11

D3 D2 D1 D0

OCF

COF

LIN

D10 D9

D8

D7 D6

D4

D5

t

DO valid

Angular Position Data

nd

Angular Position Data

Status Bits

t

DO active

2

Device

st

1

Device

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AS5045 − Detailed Description

Pulse Width Modulation (PWM) Output

The AS5045 provides a pulse width modulated output (PWM),

whose duty cycle is proportional to the measured angle:

t_on⋅4097

(EQ1)

Position =

−1

(

)

t_on+ t_off

The PWM frequency is internally trimmed to an accuracy of 5%

( 10% over full temperature range). This tolerance can be

cancelled by measuring the complete duty cycle as shown

above.

Figure 19:

PWM Output Signal

Angle

PW

MIN

0 deg

(Pos 0)

1µs

4097µs

PW

MAX

359.91 deg

(Pos 4095)

4096µs

1/f

PWM

Changing the PWM Frequency

The PWM frequency of the AS5045 can be divided by two by

setting a bit (PWMhalfEN) in the OTP register (see Programming

the AS5045). With PWMhalfEN = 0, the PWM timing is as shown

in Figure 20.

Figure 20:

PWM Signal Parameters (Default mode)

Symbol

Parameter

Typ

Unit

Note

f

PWM frequency

244

Hz

Signal period: 4097μs

PWM

- Position 0d

- Angle 0 deg

PW

MIN pulse width

MAX pulse width

1

μs

MIN

- Position 4095d

- Angle 359.91 deg

PW

4096

MAX

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AS5045 − Detailed Description

When PWMhalfEN = 1, the PWM timing is as shown in Figure 21.

Figure 21:

PWM Signal Parameters with Half Frequency (OTP Option)

Symbol

Parameter

Typ

Unit

Note

f

PWM frequency

122

Hz

Signal period: 8194μs

PWM

• Position 0d

• Angle 0 deg

PW

MIN pulse width

MAX pulse width

2

μs

MIN

• Position 4095d

• Angle 359.91 deg

PW

8192

MAX

Analog Output

An analog output can be generated by averaging the PWM

signal, using an external active or passive low pass filter.

The analog output voltage is proportional to the angle: 0°= 0V;

360° = VDD5V.

Using this method, the AS5045 can be used as direct

replacement of potentiometers.

Figure 22:

nd

Simple 2 Order Passive RC Low Pass Filter

R2

R1

analog out

Pin12

PWM

VDD

C2

C1

0V

Pin7

VSS

0º

360º

Figure 22 shows an example of a simple passive low pass filter

to generate the analog output.

(EQ2)

R1, R2 ≥ 4k7C1,

C2 ≥ 1μF / 6V

R1 should be greater than or equal to 4k7 to avoid loading of

the PWM output. Larger values of Rx and Cx will provide better

filtering and less ripple, but will also slow down the response

time.

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AS5045 − Detailed Description

The benefits of AS5045 are as follows:

• Complete system-on-chip

• Flexible system solution provides absolute and PWM

outputs simultaneously

• Ideal for applications in harsh environments due to

contactless position sensing

• No calibration required

Programming the AS5045

After power-on, programming the AS5045 is enabled with the

rising edge of CSn and Prog = logic high. 16 bit configuration

data must be serially shifted into the OTP register via the Prog

pin. The first “CCW” bit is followed by the zero position data

(MSB first) and the Mode setting bits. Data must be valid at the

rising edge of CLK (see Figure 23).

After writing the data into the OTP register it can be

permanently programmed by rising the Prog pin to the

programming voltage V

. 16 CLK pulses (t

) must be

PROG

applied to program the fuses (see Figure 24). To exit the

programming mode, the chip must be reset by a

power-on-reset. The programmed data is available after the

next power-up.

Note(s): During the programming process, the transitions in

the programming current may cause high voltage spikes

generated by the inductance of the connection cable. To avoid

these spikes and possible damage to the IC, the connection

wires, especially the signals Prog and VSS must be kept as short

as possible. The maximum wire length between the V

PROG

switching transistor and pin Prog should not exceed 50mm (2

inches). To suppress eventual voltage spikes, a 10nF ceramic

capacitor should be connected close to pins VPROG and VSS.

This capacitor is only required for programming, it is not

required for normal operation. The clock timing t must be

clk

selected at a proper rate to ensure that the signal Prog is stable

at the rising edge of CLK (see Figure 23). Additionally, the

programming supply voltage should be buffered with a 10μF

capacitor mounted close to the switching transistor. This

capacitor aids in providing peak currents during programming.

The specified programming voltage at pin Prog is 7.3 ~ 7.5V.

Refer to programming conditions in Figure 10.

To compensate for the voltage drop across the V

switching

PROG

transistor, the applied programming voltage may be set slightly

higher (7.5 ~ 8.0V, see Figure 25).

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AS5045 − Detailed Description

OTP Register Contents

CCW: Counter Clockwise Bit

ccw=0 – angular value increases in clockwise direction

ccw=1 – angular value increases in counter clockwise direction

Z [11:0]: Programmable Zero Position

PWM dis: Disable PWM output

MagCompEn: When set, activates LIN alarm both when

magnetic field is too high and too low (see Figure 16)

PWMhalfEn: When set, PWM frequency is 122Hz or 2μs / step

(when PWMhalfEN = 0, PWM frequency is 244Hz, 1μs / step)

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 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 Z11:Z0

(see Figure 23) and programmed (see Figure 24).

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

2048 to the value read at the mechanical zero position and

program the new value into the OTP register.

Repeated OTP Programming

Although a single AS5045 OTP register bit can be programmed

only once (from 0 to 1), it is possible to program other,

unprogrammed bits in subsequent programming cycles.

However, a bit that has already been programmed should not

be programmed twice. Therefore it is recommended that bits

that are already programmed are set to “0” during a

programming cycle.

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AS5045 − Detailed Description

Non-Permanent Programming

It is also possible to re-configure the AS5045 in a

non-permanent way by overwriting the OTP register.

This procedure is essentially a “Write Data” sequence

(see Figure 23) without a subsequent OTP programming cycle.

The “Write Data” sequence may be applied at any time during

normal operation. This configuration remains set while the

power supply voltage is above the power-on reset level (see

Electrical System Specifications).

See Application Note AN5000-20 for further information.

Figure 23:

Programming Access – Write Data (Section of Figure 24)

CSn

t_Datain

Mag

Comp

EN

PWM

half

PWM

dis

CCW Z 11

Z 10

Z9

Z8

Z7

Z6

Z5

8

Z4

Z3

Z2

Z1

Z0

Prog

EN

1

16

CLK_PROG

t_clk

t _{Prog enable}

t_{Datain valid}

PWM and status

bit modes

Zero Position

Figure 24:

Complete Programming Sequence

Write Data

Programming Mode

Power Off

CSn

7.5V

VDD

V_ProgOff

Data

Prog

0V

1

16

CLK_PROG

t _PrgH

t _PrgR

t_{Load PROG}

t _{PROG finished}

t _PROG

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AS5045 − Detailed Description

Figure 25:

OTP Programming Connection of AS5045 (Shown with AS5045 Demoboard)

AS5045 Demoboard

For programmin,g

keep these 6 wires

asshort as possible!

IC1

1

16

15

max. length= 2inches (5cm)

VDD5V

MagINCn

connect to USB

interface on PC

2

3

4

5

6

MagDECn

VDD3V3

3 V3

14

13

NC

7

PROG

CSN

DO

CLK

5VUSB

VPROG

3

2

1

6

5

4

12

11

+

µC

NC

PWM

CSn

10µF

Mode

3

2

1

7

8

10

9

VSS

CLK

DO

VDD3V3

VSS

GND

7. 5 …8.0V

only required for

OTP programming

Prog_DI

+

22k

10n

AS5045

GND

1µF

Cap only required for

OTP programming

Analog Readback Mode

Non-volatile programming (OTP) uses on-chip zener diodes,

which become permanently low resistive when subjected to a

specified reverse current.

The quality of the programming process depends on the

amount of current that is applied during the programming

process (up to 130mA). This current must be provided by an

external voltage source. If this voltage source cannot provide

adequate power, the zener diodes may not be programmed

properly.

In order to verify the quality of the programmed bit, an analog

level can be read for each zener diode, giving an indication

whether this particular bit was properly programmed or not.

To put the AS5045 in Analog Readback Mode, a digital sequence

must be applied to pins CSn, PROG and CLK as shown in

Figure 26. The digital level for this pin depends on the supply

configuration (3.3V or 5V) (see 3.3V / 5V Operation).

The second rising edge on CSn (OutpEN) changes pin PROG to

a digital output and the log. high signal at pin PROG must be

removed to avoid collision of outputs (grey area in Figure 26).

The following falling slope of CSn changes pin PROG to an

analog output, providing a reference voltage V , that must be

ref

saved as a reference for the calculation of the subsequent

programmed and unprogrammed OTP bits.

Following this step, each rising slope of CLK outputs one bit of

data in the reverse order as during programming

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AS5045 − Detailed Description

(see Figure 23: Md0-MD1-Div0,Div1-Indx-Z0…Z11, ccw).

If a capacitor is connected to pin PROG, it should be removed

during analog readback mode to allow a fast readout rate. If the

capacitor is not removed the analog voltage will take longer to

stabilize due to the additional capacitance.

The measured analog voltage for each bit must be subtracted

from the previously measured V , and the resulting value gives

ref

an indication on the quality of the programmed bit: a reading

of <100mV indicates a properly programmed bit and a reading

of >1V indicates a properly unprogrammed bit.

A reading between 100mV and 1V indicates a faulty bit, which

may result in an undefined digital value, when the OTP is read

at power-up.

th

Following the 18 clock (after reading bit “ccw”), the chip must

be reset by disconnecting the power supply.

Figure 26:

OTP Register Analog Read

Power- on-

ProgEN

OutpEN

Analog Readback Data at PROG

Reset;

turn off

supply

CSn

PROG

CLK

V_ref

V_programmed

Internal

test bit

digital

Mag

Comp

EN

PWM

halfEN

PWM

Dis

Z11 CCW

Z7

Z8

Z 9

Z10

Z0

V_unprogrammed

Prog changes to Output

1

16

CLK_Aread

t_LoadProg

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AS5045 − Detailed Description

Alignment Mode

The alignment mode simplifies centering the magnet over the

center of the chip to gain maximum accuracy.

Alignment mode can be enabled with the falling edge of CSn

while Prog = logic high (see Figure 27). The Data bits

D11-D0 of the SSI change to a 12-bit displacement amplitude

output. A high value indicates large X or Y displacement, but

also higher absolute magnetic field strength. The magnet is

properly aligned, when the difference between highest and

lowest value over one full turn is at a minimum.

Under normal conditions, a properly aligned magnet will result

in a reading of less than 128 over a full turn.

The MagINCn and MagDECn indicators will be = 1 when the

alignment mode reading is < 128. At the same time, both

hardware pins MagINCn (#1) and MagDECn (#2) will be pulled

to VSS. A properly aligned magnet will therefore produce a

MagINCn = MagDECn = 1 signal throughout a full 360° turn of

the magnet.

Stronger magnets or short gaps between magnet and IC may

show values larger than 128. These magnets are still properly

aligned as long as the difference between highest and lowest

value over one full turn is at a minimum.

The alignment mode can be reset to normal operation by a

power-on-reset (disconnect / re-connect power supply) or by a

falling edge on CSn with Prog = low.

Figure 27:

Enabling the Alignment Mode

PROG

CSn

Read-out

AlignMode enable

via SSI

2µs

min.

2µs

min.

Figure 28:

Exiting the Alignment Mode

PROG

Read-out

via SSI

exit AlignMode

CSn

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AS5045 − Detailed Description

3.3V / 5V Operation

The AS5045 operates either at 3.3V 10% or at 5V 10%. This is

made possible by an internal 3.3V Low-Dropout (LDO) Voltage

regulator. The internal supply voltage is always taken from the

output of the LDO, meaning that the internal blocks are always

operating at 3.3V.

For 3.3V operation, the LDO must be bypassed by connecting

VDD3V3 with VDD5V (see Figure 29).

For 5V operation, the 5V supply is connected to pin VDD5V,

while VDD3V3 (LDO output) must be buffered by a 2.2...10μF

capacitor, which is supposed to be placed close to the supply

pin (see Figure 29).

The VDD3V3 output is intended for internal use only It must not

be loaded with an external load (see Figure 29).

Figure 29:

Connections for 5V / 3.3V Supply Voltages

5V Operation

3.3V Operation

2.2... 10µF

VDD3V3

100n

Internal

VDD5V

Internal

VDD5V

LDO

VDD

LDO

VDD

DO

+

I

PWM

CLK

CSn

I

PWM

CLK

CSn

N

T

E

R

F

A

C

E

N

T

E

R

F

A

C

E

3.0 - 3.6V

4.5 - 5.5V

PROG

VSS

A buffer capacitor of 100nF is recommended in both cases close

to pin VDD5V. Note that pin VDD3V3 must always be buffered

by a capacitor. It must not be left floating, as this may cause an

instable internal 3.3V supply voltage which may lead to larger

than normal jitter of the measured angle.

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AS5045 − Detailed Description

Choosing the Proper Magnet

Typically the magnet should be 6mm in diameter and ≥2.5mm

in height. Magnetic materials such as rare earth AlNiCo/SmCo5

or NdFeB are recommended. The magnetic field strength

perpendicular to the die surface has to be in the range of 45mT

to 75mT (peak).

The magnet’s field strength should be verified using a

gauss-meter. The magnetic field B at a given distance, along a

v

concentric circle with a radius of 1.1mm (R1), should be in the

range of 45mT to 75mT (see Figure 30).

Figure 30:

Typical Magnet (6x3mm) and Magnetic Field Distribution

typ. 6mm diameter

N

S

Magnet axis

Vertical field

component

R1

Bv

(45…75mT)

Vertical field

component

0

360

N

S

R1 concentric circle;

radius 1.1mm

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AS5045 − Detailed Description

Physical Placement of the Magnet

The best linearity can be achieved by placing the center of the

magnet exactly over the defined center of the chip as shown in

the drawing below.

Figure 31:

Defined Chip Center and Magnet Displacement Radius

3.9mm

1

Defined

center

R

d

Area of recommended maximum mag-

net misalignment

Magnet Placement. The magnet’s center axis should be aligned

within a displacement radius Rd of 0.25mm from the defined

center of the IC.

The magnet may be placed below or above the device. The

distance should be chosen such that the magnetic field on the

die surface is within the specified limits (see Figure 30). The

typical distance “z” between the magnet and the package

surface is 0.5mm to 1.5mm, provided the use of the

recommended magnet material and dimensions (6mm x 3mm).

Larger distances are possible, as long as the required magnetic

field strength stays within the defined limits.

However, a magnetic field outside the specified range may still

produce usable results, but the out-of-range condition will be

indicated by MagINCn (pin 1) and MagDECn (pin 2), see

Figure 4.

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AS5045 − Detailed Description

Failure Diagnostics

The AS5045 also offers several diagnostic and failure detection

features:

Magnetic Field Strength Diagnosis

By Software: The MagINC and MagDEC status bits will both be

high when the magnetic field is out of range.

By Hardware: Pins #1 (MagINCn) and #2 (MagDECn) are

open-drain outputs and will both be turned on (= low with

external pull-up resistor) when the magnetic field is out of

range. If only one of the outputs are low, the magnet is either

moving towards the chip (MagINCn) or away from the chip

(MagDECn).

Power Supply Failure Detection

By Software: If the power supply to the AS5045 is interrupted,

the digital data read by the SSI will be all “0”s. Data is only valid,

when bit OCF is high, hence a data stream with all “0”s is invalid.

To ensure adequate low levels in the failure case, a pull-down

resistor (~10kΩ) should be added between pin DO and VSS at

the receiving side.

By Hardware: The MagINCn and MagDECn pins are open drain

outputs and require external pull-up resistors. In normal

operation, these pins are high ohmic and the outputs are high

(see Figure 15). In a failure case, either when the magnetic field

is out of range of the power supply is missing, these outputs

will become low. To ensure adequate low levels in case of a

broken power supply to the AS5045, the pull-up resistors

(~10kΩ) from each pin must be connected to the positive

supply at pin 16 (VDD5V).

By Hardware, PWM Output: The PWM output is a constant

stream of pulses with 1kHz repetition frequency. In case of

power loss, these pulses are missing.

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AS5045 − Detailed Description

Angular Output Tolerances

Accuracy

Accuracy is defined as the error between measured angle and

actual angle. It is influenced by several factors:

• The non-linearity of the analog-digital converters

• Internal gain and mismatch errors

• Non-linearity due to misalignment of the magnet

As a sum of all these errors, the accuracy with centered magnet

= (Err

– Err )/2 is specified as better than 0.5 degrees @

max

min

25°C (see Figure 33) Misalignment of the magnet further

reduces the accuracy. Figure 32 shows an example of a

3D-graph displaying non-linearity over XY-misalignment. The

center of the square XY-area corresponds to a centered magnet

(see dot in the center of the graph). The X- and Y- axis extends

to a misalignment of 1mm in both directions. The total

misalignment area of the graph covers a square of 2x2 mm

(79x79mil) with a step size of 100μm.

For each misalignment step, the measurement as shown in

Figure 33 is repeated and the accuracy (Errmax – Errmin)/2 (e.g.

0.25°) is entered as the Z-axis in the 3D-graph.

Figure 32:

Example of Linearity Error over XY Misalignment

Linearity Error over XY-misalignment [°]

6

5

4

3

800

500

200

-100

-400

2

1

x

0

-700

-1000

y

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AS5045 − Detailed Description

The maximum non-linearity error on this example is better than

1 degree (inner circle) over a misalignment radius of ~0.7mm.

For volume production, the placement tolerance of the IC

within the package ( 0.235mm) must also be taken into

account.

The total nonlinearity error over process tolerances,

temperature and a misalignment circle radius of 0.25mm is

specified better than 1.4 degrees.

The magnet used for this measurement was a cylindrical NdFeB

(Bomatec® BMN-35H) magnet with 6mm diameter and 2.5mm

in height.

Figure 33:

Example of Linearity Error over 360°

Linearity error with centered magnet [degrees]

0.5

0.4

0.3

0.2

0.1

0

transition noise

Err_max

-0.1

-0.2

-0.3

-0.4

-0.5

1

55 109 163 217 271 325 379 433 487 541 595 649 703 757 811 865 919 973

Err_min

Transition Noise

Transition noise is defined as the jitter in the transition between

two steps. Due to the nature of the measurement principle (Hall

sensors + Preamplifier + ADC), there is always a certain degree

of noise involved. This transition noise voltage results in an

angular transition noise at the outputs. It is specified as 0.06

1

degrees rms (1 sigma) in fast mode (pin MODE = high) and 0.03

degrees rms (1 sigma) in slow mode (pin MODE = low or open).

This is the repeatability of an indicated angle at a given

mechanical position.

1. Statistically, 1 sigma represents 68.27% of readings, 3 sigma represents 99.73% of readings.

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AS5045 − Detailed Description

The transition noise has different implications on the type of

output that is used:

• Absolute Output; SSI Interface: The transition noise of

the absolute output can be reduced by the user by

implementing averaging of readings. An averaging of 4

readings will reduce the transition noise by 6dB or 50%,

e.g. from 0.03°rms to 0.015°rms (1 sigma) in slow mode.

• PWM Interface: If the PWM interface is used as an analog

output by adding a low pass filter, the transition noise can

be reduced by lowering the cutoff frequency of the filter.

If the PWM interface is used as a digital interface with a

counter at the receiving side, the transition noise may

again be reduced by averaging of readings.

High Speed Operation

Sampling Rate: The AS5045 samples the angular value at a rate

of 2.61k (slow mode) or 10.42k (fast mode, selectable by pin

MODE) samples per second. Consequently, the absolute

outputs are updated each 384μs (96μs in fast mode). At a

stationary position of the magnet, the sampling rate creates no

additional error.

Absolute Mode: At a sampling rate of 2.6kHz/10.4kHz, the

number of samples (n) per turn for a magnet rotating at high

speed can be calculated by

60

(EQ3)

(EQ4)

n_slowmode

=

rpm⋅384μs

60

n_{fast mode}

=

rpm⋅96μs

The upper speed limit in slow mode is ~6.000rpm and

~30.000rpm in fast mode. The only restriction at high speed is

that there will be fewer samples per revolution as the speed

increases.

Regardless of the rotational speed, the absolute angular value

is always sampled at the highest resolution of 12 bit.

Propagation Delays

The propagation delay is the delay between the time that the

sample is taken until it is converted and available as angular

data. This delay is 96μs in fast mode and 384μs in slow mode.

Using the SSI interface for absolute data transmission, an

additional delay must be considered, caused by the

asynchronous sampling (0 … 1/f

) and the time it takes the

sample

external control unit to read and process the angular data from

the chip (maximum clock rate = 1MHz, number of bits per

reading = 18).

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AS5045 − Detailed Description

Angular Error Caused by Propagation Delay: A rotating

magnet will cause an angular error caused by the output

propagation delay.

This error increases linearly with speed:

(EQ5)

e_sampling,= rpm∗6* prop.delay

Where:

e

= angular error [°]

sampling

rpm = rotating speed [rpm]

prop.delay = propagation delay [seconds]

Note(s): Since the propagation delay is known, it can be

automatically compensated by the control unit processing the

data from the AS5045.

Internal Timing Tolerance

The AS5045 does not require an external ceramic resonator or

quartz. All internal clock timings for the AS5045 are generated

by an on-chip RC oscillator. This oscillator is factory trimmed to

5% accuracy at room temperature ( 10% over full temperature

range). This tolerance influences the ADC sampling rate and the

pulse width of the PWM output.

• Absolute Output; SSI Interface: A new angular value is

updated every 96μs (typ.) in fast mode and every 384μs

(typ.) in slow mode.

• PWM Output: A new angular value is updated every 400μs

(typ.). The PWM pulse timings T and T also have the

on

off

same tolerance as the internal oscillator. If only the PWM

pulse width T is used to measure the angle, the resulting

on

value also has this timing tolerance. However, this

tolerance can be cancelled by measuring both T and T

on

off

and calculating the angle from the duty cycle.

(EQ6)

t_on⋅4097

Position =

−1

(

)

t_on+ t_off

Temperature

Magnetic Temperature Coefficient: One of the major benefits

of the AS5045 compared to linear Hall sensors is that it is much

less sensitive to temperature. While linear Hall sensors require

a compensation of the magnet’s temperature coefficients, the

AS5045 automatically compensates for the varying magnetic

field strength over temperature. The magnet’s temperature

drift does not need to be considered, as the AS5045 operates

with magnetic field strengths from 45… 75mT.

Example:

An NdFeB magnet has a field strength of 75mT @ -40°C and a

temperature coefficient of -0.12% per Kelvin. The temperature

change is from -40° to 125° = 165K. The magnetic field change

is: 165 x -0.12% = -19.8%, which corresponds to 75mT at -40°C

and 60mT at 125°C.

ams Datasheet

Page 35

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AS5045 − Detailed Description

The AS5045 can compensate for this temperature related field

strength change automatically, no user adjustment is required.

Accuracy over Temperature:

The influence of temperature in the absolute accuracy is very

low. While the accuracy is ≤ 0.5° at room temperature, it may

increase to ≤ 0.9° due to increasing noise at high temperatures.

Timing Tolerance over Temperature: The internal RC oscillator

is factory trimmed to 5%. Over temperature, this tolerance

may increase to 10%. Generally, the timing tolerance has no

influence in the accuracy or resolution of the system, as it is

used mainly for internal clock generation. The only concern to

the user is the width of the PWM output pulse, which relates

directly to the timing tolerance of the internal oscillator. This

influence however can be cancelled by measuring the complete

PWM duty cycle instead of just the PWM pulse.

Differences Between AS5045 and AS5040

All parameters are similar for AS5045 and AS5040, except for

the parameters given below:

Figure 34:

Differences Between AS5045 and AS5040

Building Block

AS5045

AS5040

Resolution

12bits, 0.088°/step

10bit, 0.35°/step

Read: 18bits

Read: 16bits

(12bits data + 6 bits status)

OTP write: 18 bits

(10bits data + 6 bits status)

OTP write: 16 bits

Data length

(12bits zero position + 6 bits mode

selection)

(10bits zero position + 6 bits mode

selection)

Quadrature, step/direction and BLDC

motor commutation modes

Pin 3: incremental output A_LSB_U

Pin 4: incremental output B_DIR_V

Not used

Pin 3: not used

Pin 4: not used

Incremental signals

MagINCn, MagDECn: same feature as

AS5040, additional OTP option for

red-yellow-green magnetic range

MagINCn, MagDECn indicate in-range or

out-of-range magnetic field plus

movement of magnet in z-axis

Pins 1 and 2

Pin 6

MODE pin, switch between fast and slow

mode

Pin 6: Index output

Page 36

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amsDatasheet

[v2-01] 2017-Jul-13

AS5045 − Detailed Description

Building Block

AS5045

AS5040

PWM output: frequency selectable by

OTP:

PWM output:

Pin 12

1μs / step, 4096 steps per revolution,

f=244Hz 2μs/ step, 4096 steps per

revolution, f=122Hz

1μs / step, 1024 steps per revolution,

976Hz PWM frequency

Selectable by MODE input pin: 2.5kHz,

10kHz

Sampling frequency

Propagation delay

Fixed at 10kHz @10bit resolution

384μs (slow mode)

96μs (fast mode)

48μs

Transition noise

(rms; 1sigma)

0.03 degrees max. (slow mode)

0.06 degrees max. (fast mode)

0.12 degrees

Zero position, rotational direction, PWM

disable, 2 Magnetic Field indicator

modes, 2 PWM frequencies

OTP programming

options

Zero position, rotational direction,

incremental modes, index bit width.

ams Datasheet

[v2-01] 2017-Jul-13

Page 37

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AS5045 − Package Drawings & Markings

The device is available in 16-pin SSOP.

Package Drawings & Markings

Figure 35:

Package Drawings and Dimensions

Symbol Min

Nom

1.86

0.13

1.73

0.315

0.17

6.20

7.80

5.30

0.65 BSC

0.75

Max

1.99

0.21

1.78

0.38

0.25

6.50

8.20

5.60

-

0.95

-

8º

A

A1

A2

b

c

D

E

E1

e

1.73

0.05

1.68

0.22

0.09

5.90

7.40

5.00

-

L

0.55

-

0.09

0º

YYWWMZZ

AS5045 @

L1

L2

R

Q

N

1.25 REF

0.25 BSC

-

4º

16

Green

RoHS

Note(s):

1. Dimensions and tolerancing conform to ASME Y14.5M-1994.

2. All dimensions are in millimeters. Angles are in degrees.

Figure 36:

Marking: YYWWMZZ

YY

WW

M

ZZ

@

Year

Manufacturing week

Plant identifier

Assembly traceability code

Sublot identifier

Page 38

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amsDatasheet

[v2-01] 2017-Jul-13

AS5045 − Package Drawings & Markings

Figure 37:

Vertical Cross Section of SSOP-16

Note(s):

1. All dimensions in mm.

ams Datasheet

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AS5045 − Package Drawings & Markings

Recommended PCB Footprint

Figure 38:

PCB Footprint

Recommended Footprint Data

Symbol

mm

9.02

6.16

0.46

0.65

5.01

inch

0.355

0.242

0.018

0.025

0.197

A

B

C

D

E

Page 40

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amsDatasheet

[v2-01] 2017-Jul-13

AS5045 − Ordering & Contact Information

The devices are available as the standard products shown in

Figure 39.

Ordering & Contact Information

Figure 39:

Ordering Information

Ordering Code

AS5045-ASSM

AS5045-ASST

Description

Package

16-pin SSOP

Delivery Form Delivery Quantity

Tape & Reel

500 pcs/reel

12-Bit Programmable

Magnetic Position Sensor

2000 pcs/reel

Buy our products or get free samples online at:

www.ams.com/ICdirect

Technical Support is available at:

www.ams.com/Technical-Support

Provide feedback about this document at:

www.ams.com/Document-Feedback

For further information and requests, e-mail us at:

ams_sales@ams.com

For sales offices, distributors and representatives, please visit:

www.ams.com/contact

Headquarters

ams AG

Tobelbader Strasse 30

8141 Premstaetten

Austria, Europe

Tel: +43 (0) 3136 500 0

Website: www.ams.com

ams Datasheet

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AS5045 − RoHS Compliant & ams Green Statement

RoHS: The term RoHS compliant means that ams AG products

fully comply with current RoHS directives. Our semiconductor

products do not contain any chemicals for all 6 substance

categories, including the requirement that lead not exceed

0.1% by weight in homogeneous materials. Where designed to

be soldered at high temperatures, RoHS compliant products are

suitable for use in specified lead-free processes.

RoHS Compliant & ams Green

Statement

ams Green (RoHS compliant and no Sb/Br): ams Green

defines that in addition to RoHS compliance, our products are

free of Bromine (Br) and Antimony (Sb) based flame retardants

(Br or Sb do not exceed 0.1% by weight in homogeneous

material).

Important Information: The information provided in this

statement represents ams AG knowledge and belief as of the

date that it is provided. ams AG bases its knowledge and belief

on information provided by third parties, and makes no

representation or warranty as to the accuracy of such

information. Efforts are underway to better integrate

information from third parties. ams AG has taken and continues

to take reasonable steps to provide representative and accurate

information but may not have conducted destructive testing or

chemical analysis on incoming materials and chemicals. ams AG

and ams AG suppliers consider certain information to be

proprietary, and thus CAS numbers and other limited

information may not be available for release.

Page 42

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AS5045 − Copyrights & Disclaimer

Copyright ams AG, Tobelbader Strasse 30, 8141 Premstaetten,

material herein may not be reproduced, adapted, merged,

translated, stored, or used without the prior written consent of

the copyright owner.

Copyrights & Disclaimer

Devices sold by ams AG are covered by the warranty and patent

indemnification provisions appearing in its General Terms of

Trade. ams AG makes no warranty, express, statutory, implied,

or by description regarding the information set forth herein.

ams AG reserves the right to change specifications and prices

at any time and without notice. Therefore, prior to designing

this product into a system, it is necessary to check with ams AG

for current information. This product is intended for use in

commercial applications. Applications requiring extended

temperature range, unusual environmental requirements, or

high reliability applications, such as military, medical

life-support or life-sustaining equipment are specifically not

recommended without additional processing by ams AG for

each application. This product is provided by ams AG “AS IS”

and any express or implied warranties, including, but not

limited to the implied warranties of merchantability and fitness

for a particular purpose are disclaimed.

ams AG shall not be liable to recipient or any third party for any

damages, including but not limited to personal injury, property

damage, loss of profits, loss of use, interruption of business or

indirect, special, incidental or consequential damages, of any

kind, in connection with or arising out of the furnishing,

performance or use of the technical data herein. No obligation

or liability to recipient or any third party shall arise or flow out

of ams AG rendering of technical or other services.

ams Datasheet

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AS5045 − Document Status

Document Status

Product Status

Definition

Information in this datasheet is based on product ideas in

the planning phase of development. All specifications are

design goals without any warranty and are subject to

change without notice

Product Preview

Pre-Development

Information in this datasheet is based on products in the

design, validation or qualification phase of development.

The performance and parameters shown in this document

are preliminary without any warranty and are subject to

change without notice

Preliminary Datasheet

Datasheet

Pre-Production

Production

Information in this datasheet is based on products in

ramp-up to full production or full production which

conform to specifications in accordance with the terms of

ams AG standard warranty as given in the General Terms of

Trade

Information in this datasheet is based on products which

conform to specifications in accordance with the terms of

ams AG standard warranty as given in the General Terms of

Trade, but these products have been superseded and

should not be used for new designs

Datasheet (discontinued)

Discontinued

Page 44

amsDatasheet

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AS5045 − Revision Information

Revision Information

Changes from 1.8 (2013-Aug-14) to current revision 2-01 (2017-Jul-13)

1.8 (2013-Aug-14) to 2-00 (2016-Sep-12)

Content was updated to the latest ams design

Added Figure 1

Page

1

Updated Figure 39

41

2-00 (2016-Sep-12) to 2-01 (2017-Jul-13)

Updated Figure 39

41

Note(s):

1. Page and figure numbers for the previous version may differ from page and figure numbers in the current revision.

2. Correction of typographical errors is not explicitly mentioned.

ams Datasheet

[v2-01] 2017-Jul-13

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AS5045 − Content Guide

1

2

General Description

Key Benefits & Features

Applications

Content Guide

Block Diagram

3

Pin Assignment

Pin Description

5

Absolute Maximum Ratings

6

8

Electrical Characteristics

Magnetic Input Specification

Electrical System Specifications

11 Timing Characteristics

13 Detailed Description

14 Mode Input Pin

14 Synchronous Serial Interface (SSI)

15 Data Content

16 Z-axis Range Indication (Push Button Feature, Red/Yel-

low/Green Indicator)

18 Daisy Chain Mode

19 Pulse Width Modulation (PWM) Output

19 Changing the PWM Frequency

20 Analog Output

21 Programming the AS5045

22 Zero Position Programming

22 Repeated OTP Programming

23 Non-Permanent Programming

24 Analog Readback Mode

26 Alignment Mode

27 3.3V / 5V Operation

28 Choosing the Proper Magnet

29 Physical Placement of the Magnet

30 Failure Diagnostics

30 Magnetic Field Strength Diagnosis

30 Power Supply Failure Detection

31 Angular Output Tolerances

31 Accuracy

32 Transition Noise

33 High Speed Operation

33 Propagation Delays

34 Internal Timing Tolerance

34 Temperature

35 Accuracy over Temperature:

35 Differences between AS5045 and AS5040

Page 46

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AS5045 − Content Guide

37 Package Drawings & Markings

39 Recommended PCB Footprint

40 Ordering & Contact Information

41 RoHS Compliant & ams Green Statement

42 Copyrights & Disclaimer

43 Document Status

44 Revision Information

ams Datasheet

[v2-01] 2017-Jul-13

Page 47

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型号：	AS5045-ASST
厂家：	AMS(艾迈斯)
描述：	12-Bit Programmable Magnetic Rotary Position Sensor
文件：	总47页 (文件大小：633K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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