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AS5261
12-Bit Automotive Angle Position Sensor
General Description
The AS5261 is a contactless magnetic angle position sensor for
accurate angular measurement over a full turn of 360°. A sub
range can be programmed to achieve the best resolution for
the application. It is a system-on-chip, combining integrated
Hall elements, analog front end, digital signal processing and
best in class automotive protection features 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
0.022° = 16384 positions per revolution. According to this
resolution the adjustment of the application specific
mechanical positions are possible. The angular output data is
available over a 12 bit PWM output.
The AS5261 operates at a supply voltage of 5V and the supply
and output pins are protected against overvoltage up to +20V.
In addition the supply pins are protected against reverse
polarity up to –20V.
Figure 1:
Typical Arrangement of AS5261 and Magnet
Ordering Information and Content Guide appear at end of
datasheet.
ams Datasheet
[v1-04] 2015-Dec-07
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AS5261 − General Description
Key Benefits & Features
The benefits and features of AS5261, 12-Bit Automatic Angle
Position Sensor are listed below:
Figure 2:
Added Value of Using AS5261
Benefits
Features
• Great flexibility on angular excursion
• 360º contactless high resolution angular position sensing
• Simple programming
• User programmable start and end point of the
application region
• Saw tooth mode 1-4 slopes per revolution
• Clamping levels
• Transition point
• Failure diagnostics
• Broken GND and VDD detection for all external load cases
• High-Resolution output signal
• 12-Bit pulse width modulated (PWM) output
• Ideal for applications in harsh
environments due to contactless
position sensing
• Wide temperature range: - 40°C to 150°C
• Stacked die redundant approach
• Small Pb-free package: MLF 16 6x6 (with dimple)
Applications
The AS5261 is ideal for automotive applications like:
• Throttle and valve position sensing
• Gearbox position sensor
• Pedal position sensing
• Contactless potentiometers
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ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − General Description
Block Diagram
The functional blocks of this device are shown below:
Figure 3:
AS5261 Block Diagram
VDD3V3_T
VDD3V3_B
High Voltage/
Reverse Polarity
Protection
VDD_T
VDD_B
Hall Array
Frontend
Amplifier
ADC
AS5261
Sin
Cos
DSP
CORDIC
Controller
12
Single Pin
Interface
(UART)
PWM
OUT_T
LS Driver
OUT_B
OTP Register
(Programming
Parameters)
GND_B
ams Datasheet
[v1-04] 2015-Dec-07
GND_T
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AS5261 − Pin Assignment
Pin Assignment
Figure 4:
MLF-16 Pin Configuration (Top View)
VDD_B
VDD_T
OUT_B
OUT_T
16
15
14
13
TP1_T
1
12 S_B
TP1_B
2
11 S_T
VDD3V3_T
3
10 TP3_B
VDD3V3_B
4
9
Epad
5
6
7
8
TP3_T
GND_T
GND_B
TP2_T
TP2_B
Pin Description
Figure 5:
MLF-16 Pin Description
Pin
Number
Pin Name
1
TP1_T
Pin Type
DIO/AIO
Multi purpose pin
2
TP1_B
3
VDD3V3_T
Description
Test pin for fabrication. Connected to ground in the
application.
Test pin for fabrication. Connected to ground in the
application.
Output of the LDO. 1μF required.
AIO
4
VDD3V3_B
5
GND_T
Output of the LDO. 1μF required.
Ground pin. Connected to ground in the application.
Supply pin
6
GND_B
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Ground pin. Connected to ground in the application.
ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − Pin Assignment
Pin
Number
Pin Name
7
TP2_T
8
TP2_B
9
TP3_T
Test pin for fabrication. Left open in the application.
10
TP3_B
Test pin for fabrication. Left open in the application.
11
S_T
Pin Type
Description
Test pin for fabrication. Connected to ground in the
application.
DIO/AIO
Multi purpose pin
Test pin for fabrication. Connected to ground in the
application.
Test pin for fabrication. Connected to OUT_T in the
application.
(special case for the connection possible → 4-wire mode)
AIO
12
S_B
13
OUT_T
14
OUT_B
15
VDD_T
Test pin for fabrication. Connected to OUT_B in the
application.
(special case for the connection possible → 4-wire mode)
Digital
output/Digital
PWM output
PWM output pin. Open drain configuration.
Programming pin.
PWM output pin. Open drain configuration.
Programming pin.
Positive supply pin. This pin is over voltage protected.
Supply pin
16
ams Datasheet
[v1-04] 2015-Dec-07
VDD_B
Positive supply pin. This pin is over voltage protected.
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AS5261 − Absolute Maximum Ratings
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.
Figure 6:
Absolute Maximum Ratings
Symbol
Parameter
Min
Max
Units
Comments
Electrical Parameters
VDD
DC supply voltage at pin VDD
Overvoltage
-20
20
V
No operation
VOUT
Output voltage OUT
-0.3
20
V
Permanent
DC supply voltage at pin
VDD3V3
-0.3
5
V
Input current
(latchup immunity)
-100
100
mA
Norm: AEC-Q100-004
kV
Norm: AEC-Q100-002
VDD3V3
Iscr
Electrostatic Discharge
ESD
Electrostatic discharge
±2
Temperature Ranges and Storage Conditions
TStrg
Storage temperature
TBody
Body temperature
RHNC
Relative humidity
non-condensing
MSL
Moisture Sensitivity Level
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-55
150
5
3
ºC
Min -67ºF; Max 257ºF
260
ºC
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”. The lead finish for
Pb-free leaded packages is
matte tin (100% Sn).
85
%
Represents a maximum floor life
time of 168h
ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − Electrical Characteristics
Electrical Characteristics
Operating Conditions
In this specification, all the defined tolerances for external
components need to be assured over the whole operation
conditions range and also over lifetime.
Figure 7:
Operating Conditions
Symbol
Parameter
Conditions
TAMB
Ambient temperature
-40ºF to 302ºF
Isupp
Supply current
Only for one die. Must be
multiplied by 2
VDD
Supply voltage at pin VDD
Min
Typ
-40
4.5
5.0
Max
Units
150
ºC
10
mA
5.5
V
Magnetic Input Specification
TAMB = -40ºC to 150ºC, V DD = 4.5V to 5.5V (5V operation), unless
otherwise noted.
Two-Pole Cylindrical Diametrically Magnetized Source
Figure 8:
Magnetic Input Specification
Symbol
Bpk
Bpkext
Boff
Disp
Parameter
Conditions
Min
Magnetic input field
amplitude
Required vertical component
of the magnetic field strength
on the die’s surface, measured
along a concentric circle with
a radius of 1.25 mm
Magnetic input field
amplitude
(extended) default setting
Required vertical component
of the magnetic field strength
on the die’s surface, measured
along a concentric circle with
a radius of 1.25 mm. Increased
sensor output noise.
Magnetic offset
Constant magnetic stray field
Displacement radius
Offset between defined
device center and magnet
axis. Dependent on the
selected magnet. Including
Eccentricity
ams Datasheet
[v1-04] 2015-Dec-07
Typ
Max
Units
30
70
mT
10
90
mT
±5
mT
1
mm
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AS5261 − Electrical Characteristics
Electrical System Specifications
TAMB = -40ºC to 150ºC, V DD = 4.5V - 5.5V (5V operation), Magnetic
Input Specification, unless otherwise noted.
Figure 9:
Electrical System Specifications
Symbol
RES
Parameter
Conditions
Min
Typ
Max
Units
Resolution PWM Output
Range > 90º
12
bit
INLopt
Integral non-linearity
(optimum)
Best aligned reference
magnet at 25ºC over full turn
360º.
0.5
deg
INLtemp
Integral non-linearity
(optimum)
Best aligned reference
magnet over temperature
-40 -150º over full turn 360º.
0.9
deg
Integral non-linearity
Best aligned reference
magnet over temperature
-40 -150º over full turn 360º
and displacement
1.4
deg
ONF0
At 14 bit angular
information, 360º mode.
Internal Filter disabled.
±5
LSB
ONF1
At 14 bit angular
information, 360º mode.
Filter setting 1.
±3
LSB
ONF2
At 14 bit angular
information, 360º mode.
Filter setting 2.
±2
LSB
ONF3
At 14 bit angular
information, 360º mode.
Filter setting 3. Jitter free.
±0.5
LSB
10
ms
300
μs
Max
Units
12
ms
INL
Output Noise
tPwrUp
Power-up time 0-5V
tdelay
System propagation delay
absolute output: delay of
ADC, DSP and absolute
interface
Power up time 5V operation.
Default Power up.
Timing Characteristics
Figure 10:
Timing Conditions
Symbol
Parameter
TDETWD
WachDog error detection time
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Conditions
Min
Typ
ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − Detailed Description
Detailed Description
The AS5261 is manufactured in a CMOS process and uses a
spinning current Hall technology for sensing the magnetic field
distribution across the surface of the chip. This IC consists of
two galvanic isolated dies. All following in and register names
refers to one die.
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.
Through Sigma-Delta Analog / Digital Conversion and Digital
Signal-Processing (DSP) algorithms, the AS5261 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 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.
The AS5261 senses the orientation of the magnetic field and
calculates a 14-bit binary code. This code is mapped to a
programmable output characteristic in a PWM duty cycle
format. This signal is available at the pin (OUT).
The application angular region can be programmed in a user
friendly way. The start angle position T1 and the end point T2
can be set and programmed according the mechanical range
of the application with a resolution of 14 bits. In addition the
T1Y and T2Y parameter can be set and programmed according
the application. The transition point 0 to 360 degree can be
shifted using the break point parameter BP. The voltage for
clamping level low CLL and clamping level high CLH can be
programmed with a resolution of 9 bits. Both levels are
individually adjustable.
The output parameters can be programmed in an OTP register.
No additional voltage is required to program the AS5261. The
setting may be overwritten at any time and will be reset to
default when power is cycled. To make the setting permanent,
the OTP register must be programmed by using a lock bit the
content could be frozen for ever.
The AS5261 is tolerant to magnet misalignment and unwanted
external magnetic fields due to differential measurement
technique and Hall sensor conditioning circuitry.
ams Datasheet
[v1-04] 2015-Dec-07
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AS5261 − Detailed Description
Operation
VDD Voltage Monitor
VDD Over Voltage Management. If the voltage applied to the
VDD pin exceeds the over-voltage upper threshold for longer
than the detection time the output is turned off. When the over
voltage event has passed and the voltage applied to the VDD
pin falls below the over-voltage lower threshold for longer than
the recovery time the device enters the normal mode and the
output is enabled.
VDD Under Voltage Management. When the voltage applied
to the VDD pin falls below the under-voltage lower threshold
for longer than the detection time the output is turned off.
When the voltage applied to the VDD pin exceeds the
under-voltage upper threshold for longer than the detection
time the device enters the normal mode and the output is
enabled.
PWM Output
By default (after programmed CUST_LOCK OTP bit) the PWM
output mode is selected. The pin OUT provides a modulated
signal that is proportional to the angle of the rotating magnet.
Due to an intelligent approach a permanent short circuit will
not damage the device. This is also feasible in a high voltage
condition up to 20V and at the highest specified ambient
temperature.
After the digital signal processing (DSP) a PWM engine provides
the output signal.
The DSP maps the application range to the output
characteristic. An inversion of the slope is also programmable
to allow inversion of the rotation direction.
An on-chip diagnostic feature handles the error state at the
output. Depending on the failure the output is in HiZ condition
or indicates a PWM signal within the failure bands of 4 – 96%
duty cycle (see Figure 18).
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ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − Detailed Description
Programming Parameters
The PWM output characteristic is programmable by OTP.
Depending on the application, the output can be adjusted. The
user can program the following application specific
parameters.
Figure 11:
Programming Parameters
T1
Mechanical angle start point
T2
Mechanical angle end point
T1Y
% duty cycle level at the T1 position
T2Y
% duty cycle level at the T2 position
CLL
Clamping Level Low
CLH
Clamping Level High
BP
Break point (transition point 0 to 360º)
These parameters are input parameters. Using the available
programming software and programmer these parameters are
converted and finally written into the AS5261 128 bit OTP
memory.
ams Datasheet
[v1-04] 2015-Dec-07
Page 11
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AS5261 − Detailed Description
Application Specific Angular Range Programming
The application range can be selected by programming T1 with
a related T1Y and T2 with a related T2Y into the AS5261. The
clamping levels CLL and CLH can be programmed independent
from the T1 and T2 position and both levels can be separately
adjusted.
Figure 12:
Programming of an Individual Application Range
90 degree
Application range
electrical range
T2
mechanical range
T1
100%DC
clamping range
high
CLH
CLL
0 degree
T2Y
180 degree
CLH
T1Y
BP
CLL
0
clamping range
low
T1
T2
270 degree
Figure 12 shows a simple example of the selection of the range.
The mechanical starting point T1 and the mechanical end point
T2 are defining the mechanical range. A sub range of the
internal CORDIC output range is used and mapped to the
needed output characteristic. The PWM output signal has 12
bit, hence the level T1Y and T2Y can be adjusted with this
resolution. As a result of this level and the calculated slope the
clamping region low is defined. The break point BP defines the
transition between CLL and CLH. In this example the BP is set
to 0º. The BP is also the end point of the clamping level high
CLH. This range is defined by the level CLH and the calculated
slope. Both clamping levels can be set independently form each
other. The minimum application range is 9.8º.
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ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − Detailed Description
Application Specific Programming of the Break Point
The break point BP can be programmed as well with 14 bits.
This is important when the default transition point is inside the
application range. In such a case the default transition point
must be shifted out of the application range. The parameter BP
defines the new position.
Figure 13:
Individual Programming of the Break Point BP
90 degree
Application range
electrical range
T2
mechanical range
T1
100%DC
CLH
clamping range
high
CLH
0 degree
T2Y
180 degree
CLL
T1Y
CLL
BP
0
clamping range
low
T1
T2
clamping range
low
270 degree
ams Datasheet
[v1-04] 2015-Dec-07
Page 13
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AS5261 − Detailed Description
Multiple Slope Output
The AS5261 can be programmed to multiple slopes. Where one
programmed reference slope characteristic is copied to
multiple slopes. Two, three and four slopes are selectable by the
user OTP bits QUADEN (1:0). In addition to the steepness of the
slope the clamping levels can be programmed as well.
Duty Cycle
Figure 14:
Two Slope Mode
0
Duty Cycle
Figure 15:
Four Slope Mode
0
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ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − Detailed Description
Resolution of Parameters
The programming parameters have a wide resolution of up to
14 bits.
Figure 16:
Resolution of the Programming Parameters
Symbol
Parameter
Resolution
T1
Mechanical angle start point
14 bits
T2
Mechanical angle stop point
14 bits
T1Y
Mechanical start voltage level
12 bits
T2Y
Mechanical stop voltage level
12 bits
CLL
Clamping level low
9 bits
CLH
Clamping level high
9 bits
Break point
14 bits
BP
Note
Figure 17:
Overview of the Output Range
100
96
Failure Band High
Clamping Region High
CLH
Duty Cycle
T2Y
Application Region
T1Y
CLL
Clamping Region Low
4
0
ams Datasheet
[v1-04] 2015-Dec-07
Failure Band Low
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AS5261 − Detailed Description
Figure 17 gives an overview about the different ranges. The
failure bands are used to indicate a wrong operation of the
AS5261. This can be caused due to a broken supply line. By using
the specified load resistors the output level will remain in these
bands during a fail. It is recommended to set the clamping level
CLL above the lower failure band and the clamping level CLH
below the higher failure band.
C LOAD ≤ 33nF, R PU= 1kΩ to 10kΩ
Figure 18:
Different Failure Cases of AS5261
Type
Failure Mode
Symbol
Failure Band
MAGRng
High/Low
Programmable by OTP bit
DIAG_HIGH
CORDIC overflow
COF
High/Low
Programmable by OTP bit
DIAG_HIGH
Offset compensation
finished
OCF
High/Low
Programmable by OTP bit
DIAG_HIGH
Watchdog fail
WDF
High/Low
Programmable by OTP bit
DIAG_HIGH
Oscillator fail
OF
High/Low
Programmable by OTP bit
DIAG_HIGH
Overvoltage condition
OV
Out of magnetic range
(too less or too high
magnetic input)
Internal alarms
(failures)
Application
related failures
Broken VDD
BVDD
Broken VSS
BVSS
Short circuit output
SCO
Note
High
Dependant on the load
resistor
Pull up → failure band high
High
Switch off → short circuit
dependent
For efficient use of diagnostics, it is recommended to program
to clamping levels CLL and CLH.
Hysteresis Function
AS5261 device includes a hysteresis function to avoid sudden
jumps from CLH to CLL and vice versa caused by noise in the
full turn configuration.
The hysteresis amplitude can be selected via the OTP bits
HYSTSEL<1:0>.
Page 16
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ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − Detailed Description
PWM Output Driver Parameters
The output stage is configured in a open drain output.
The PWM duty cycle represents the angular output data. All
programming features are available for the PWM mode as well.
The PWM period is programmable in four steps and can be
programmed by PWMF<2:0>.
C LOAD≤ 33nF, R PU= 1kΩ to 10kΩ
Figure 19:
PWM Parameters Output Driver
Symbol
Parameter
Conditions
Min
Typ
Max
Units
PWMF1
PWM frequency 7
PWMF<2:0>=111
109.86
122
134.28
Hz
PWMF2
PWM frequency 6
PWMF<2:0>=110
179.78
200
219.73
Hz
PWMF3
PWM frequency 5
PWMF<2:0>=101
219.73
244
268.55
Hz
PWMF4
PWM frequency 4
PWMF<2:0>=100
329.59
366
402.83
Hz
PWMF5
PWM frequency 3
PWMF<2:0>=011
494.38
549
604.25
Hz
PWMF6
PWM frequency 2
PWMF<2:0>=010
659.18
732
805.66
Hz
PWMF7
PWM frequency 1
PWMF<2:0>=001
988.77
1100
1208.50
Hz
PWMF8
PWM frequency 0
PWMF<2:0>=000
1977.54
2197
2416.2
Hz
PWMDC
PWM duty cycle range
info parameter
4
96
%
PWMVOL
Output voltage low
IOUT=5mA
0
0.4
V
PWMSRF
PWM slew rate
(falling edge)
Between 75% and 25%
RPUOUT=4KΩ;
CLOUT=1nF
VDD=5V
1
4
V / μs
ams Datasheet
[v1-04] 2015-Dec-07
2
Page 17
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AS5261 − Application Information
Application Information
Recommended Application Schematic
Figure 20 shows the recommended schematic in the
application. All components marked with (*) are optional and
can be used to further increase the EMC.
Figure 20:
Recommended Schematic of Pull-Up Configuration
Sensor PCB
Electric Control Unit
VDD1
VDD2
R1_x*
TP1_T
TP1_B
VDD3V3_T
C2_x
VDD3V3_B
15
14
RLPU_B
13
1
12
2
11
AS5261
3
RLPU_T
OUT1
OUT_T
C4_x*
OUT_B
VDD_B
VDD_T
16
C1_x
OUT2
R2_x*
10
4
9
5
6
7
8
S_B
S_T
C3_x
TP3_B
CL_T
CL_B
TP3_T
GND_T
GND_B
TP2_T
TP2_B
GND1
GND2
Figure 21:
External Components
Symbol
Parameter
Min
Typ
Max
Units
Note
C1
VDD buffer capacitor
0.8
1
1.2
μF
Low ESR 0.3 Ω
C2
VDD3V3 regulator capacitor
0.8
1
1.2
μF
Low ESR 0.3 Ω
C3
OUT load capacitor
(sensor PCB)
4.7
nF
C4*
VDD capacitor (optional)
4.7
nF
R1*
VDD serial resistor (optional)
10
Ω
CL
OUT load capacitor (ECU)
R2*
OUT serial resistor (optional)
RLPU
OUT pull-up resistance
Page 18
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0
0
33
nF
Ω
50
4
Do not increase due to
programming over output.
10
kΩ
ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − Application Information
Programming the AS5261
The AS5261 programming is a one-time-programming (OTP)
method, based on polysilicon fuses. The advantage of this
method is that no additional programming voltage is needed.
The internal LDO provides the current for programming.
The OTP consists of 128 bits; several bits are available for user
programming. In addition factory settings are stored in the OTP
memory. Both regions are independently lockable by build in
lock bits.
A single OTP cell can be programmed only once. Per default,
the cell is “0”; a programmed cell will contain a “1”. While it is
not possible to reset a programmed bit from “1” to “0”, multiple
OTP writes are possible, as long as only unprogrammed “0”-bits
are programmed to “1”.
Independent of the OTP programming, it is possible to
overwrite the OTP register temporarily with an OTP write
command. This is possible only if the user lock bit is not
programmed.
Due to the programming over the output pin the device will
initially start in the communication mode. In this mode the
digital angle value can be read with a specific protocol format.
It is a bidirectional communication possible. Parameters can be
written into the device. A programming of the device is
triggered by a specific command. With another command
(pass2func) the device can be switched into operation mode.
In case of a programmed user lock bit the AS5261 automatically
starts up in the functional operation mode. No communication
of the specific protocol is possible after this.
A standard half duplex UART protocol is used to exchange data
with the device in the communication mode.
UART Interface for Programming
The AS5261 uses a standard UART interface with a byte for
address and two bytes for the data content. The read or write
mode is selected in the first byte. An even parity for every byte.
The timing (baudrate) is selected by the AS5261 over an initial
command from the master. The baud rate register can be read
and overwritten. The keep synchronization it AS5261
synchronizes art every Start bit. This happens during a standard
write access 3 times.
A time out function detects not complete commands and resets
the AS5261 UART after the timeout period.
ams Datasheet
[v1-04] 2015-Dec-07
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AS5261 − Application Information
Frame Organization
Each frame is composed by 24 bits. The first byte (Address or
Command) of the frame specifies the read/write operation with
the register address or is used for a command. 16 data bits
contains the communication data. There will be no operation
in case of the usage of a not specified CMD. The UART
programming interface block of the AS5261 can operate in
slave communication or master communication mode. In the
slave communication mode the AS5261 receives the data. The
programming tool is the driver of the single communication
line. In case of the master comunication mode the AS5261
transmits data in the frame format. The single communication
line can be pulled down by the AS5261.
Figure 22:
OTP Commands and Communication
Possible Interface
Commands
Address /
Command
AS5X63
Communication Mode
WRITE
0x00-0x0F (OTP)
0x10-0x1F (SFR)
0x20-0xFF (Special Mode)
SLAVE
Write related to the
address the user data
READ
0x00-0x0F (OTP)
0x10-0x1F (SFR)
0x20-0xFF (Special Mode)
SLAVE and MASTER
Read related to the
address the user data
FUSE
0x22+ key
SLAVE
Command for permanent
programming
PASS2FUNC
0x23+ key
SLAVE
Change operation mode
from communication to
operation
Page 20
Document Feedback
Description
ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − Application Information
READ
Figure 23 shows the format of the frame.
High Byte
S
P
AS5261 in Receiving
Mode
IDLE
Even Parity
Stop
Even Parity
Stop
Break
Start
P
MSB
LSB
Low Byte
S
R/Wn
Even Parity
Stop
Break
Start
P
MSB
LSB
Reg. Address
S
Start
IDLE
MSB
LSB
Figure 23:
Organization of the READ Command
AS5261 in transmitting mode (Read
Access)
The R/Wn bit in the first byte selects the mode. Between the
data packets is always a break state. The break state has the
same length as the other data bits.
An even parity bit is used to guarantee a correct data
transmission. The parity bit is generated by the 8 bits.
WRITE
Figure 24 shows the format of the frame.
P
MSB
High Byte
S
P
Even Parity
Stop
LSB
MSB
Low Byte
Even Parity
Stop
Break
Start
S
R/n
Even Parity
Stop
Break
Start
P
AS5261 in Receiving
Mode
ams Datasheet
[v1-04] 2015-Dec-07
LSB
Reg. Address
S
Start
IDLE
MSB
LSB
Figure 24:
Organization of the WRITE Command
IDLE
AS5261 in Receiving Mode (Write Access)
Page 21
Document Feedback
AS5261 − Application Information
Baud Rate Setup
Due to the internal RC oscillator the AS5261 needs to
synchronize to the master. This happens after startup with the
first baud rate command. This register address is reserved after
the first successful setup for a possible manual setting of the
baud rate.
1
0
IDLE
MSB
Start
LSB
IDLE
P
Baud Command
0
1
0
1
0
1
0
P
S
Start
Even Parity
Stop
Break
Start
S 1
0x55 » „U“ will be send from
Master to Setup Baudrate of
AS5261
Low Byte
P
High Byte
MSB
0
S
P
Even Parity
Stop
1
LSB
0
MSB
1
Even Parity
Stop
0
Even Parity
Stop
Break
Start
Baud Command
S 1
LSB
IDLE
MSB
LSB
Figure 25:
Baud Rate Setup
IDLE
Read Write Baud Rate of
AS5261
AS5261 in Receiving
Mode
Page 22
Document Feedback
ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − Application Information
OTP Programming Data
Figure 26:
OTP Memory Map
Data Byte
Bit
Number
Symbol
Default
0
0
1
0
2
0
3
0
4
0
5
0
6
0
7
0
Description
DATA15 (0x0F)
1
Factory
Settings
0
ams (reserved)
0
2
0
3
0
4
0
5
0
6
0
7
0
0
0
1
0
Factory Settings
0
DATA14 (0x0E)
CUSTID<0>
0
3
CUSTID<1>
0
4
CUSTID<2>
0
5
CUSTID<3>
0
6
CUSTID<4>
0
7
CUSTID<5>
0
0
CUSTID<6>
0
DATA13 (0x0D)
DATA12 (0x0C)
ams Datasheet
[v1-04] 2015-Dec-07
Customer Identifier
Customer Settings
2
Page 23
Document Feedback
AS5261 − Application Information
Bit
Number
Symbol
Default
DATA11 (0x0B)
7
CLH<0>
0
0
CLH<1>
0
1
CLH<2>
0
2
CLH<3>
0
3
CLH<4>
0
4
CLH<5>
0
5
CLH<6>
0
6
CLH<7>
0
7
CLH<8>
0
DATA10 (0x0A)
Page 24
Document Feedback
Description
Clamping Level High
Customer Settings
Data Byte
ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − Application Information
Data Byte
Bit
Number
Symbol
Default
0
CLL<0>
0
1
CLL<1>
0
2
CLL<2>
0
3
CLL<3>
0
4
CLL<4>
0
5
CLL<5>
0
6
CLL<6>
0
7
CLL<7>
0
0
CLL<8>
0
1
OFFSET<0>
0
2
OFFSET<1>
0
3
OFFSET<2>
0
4
OFFSET<3>
0
5
OFFSET<4>
0
6
OFFSET<5>
0
7
OFFSET<6>
0
0
OFFSET<7>
0
1
OFFSET<8>
0
2
OFFSET<9>
0
3
OFFSET<10>
0
4
OFFSET<11>
0
5
OFFSET<12>
0
6
OFFSET<13>
0
7
OFFSET<14>
0
Description
DATA9 (0x09)
Clamping Level Low
Customer Settings
DATA8 (0x08)
Offset
DATA7 (0x07)
ams Datasheet
[v1-04] 2015-Dec-07
Page 25
Document Feedback
AS5261 − Application Information
Data Byte
Bit
Number
Symbol
Default
0
OFFSET<15>
0
1
OFFSET<16>
0
2
OFFSET<17>
0
3
OFFSET<18>
0
4
OFFSET<19>
0
5
GAIN<0>
0
6
GAIN<1>
0
7
GAIN<2>
0
0
GAIN<3>
0
1
GAIN<4>
0
2
GAIN<5>
0
3
GAIN<6>
0
4
GAIN<7>
0
5
GAIN<8>
0
6
GAIN<9>
0
7
GAIN<10>
0
0
GAIN<11>
0
1
GAIN<12>
0
2
GAIN<13>
0
3
GAIN<14>
0
4
GAIN<15>
0
5
GAIN<16>
0
6
BP<0>
0
7
BP<1>
0
0
BP<2>
0
1
BP<3>
0
2
BP<4>
0
3
BP<5>
0
4
BP<6>
0
5
BP<7>
0
Description
Offset
DATA6 (0x06)
DATA5 (0x05)
Customer Settings
Scale Factor
DATA4 (0x04)
Break Point
DATA3 (0x003)
Page 26
Document Feedback
ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − Application Information
Data Byte
Bit
Number
Symbol
Default
6
BP<8>
0
7
BP<9>
0
0
BP<10>
0
1
BP<11>
0
2
BP<12>
0
3
BP<13>
0
Description
Break Point
ANGLERNG
0
5
DIAG_HIGH
0
Failure Band Selection
0=Failure Band Low
1=Failure Band High
6
QUADEN<0>
0
7
QUADEN<1>
0
DATA2 (0x02)
0
AIRGAPSEL
0
1
HYSTSEL<0>
0
2
HYSTSEL<1>
0
3
Not used
0
4
Not used
0
5
Not used
0
6
Not used
0
7
Not used
0
DATA1 (0x01)
ams Datasheet
[v1-04] 2015-Dec-07
Quadrant Mode Enable
00=1quadrant;
01=2quadrants;
10=3 quadrants;
11=4 quadrants
Customer Settings
4
Sector selection
0=Angular Sector≥22.5
degrees;
1=Angular Sector<22.5
degrees
Magnetic input range
extension
0:extended range;
1=normal range
Hysteresis selection
00=no hysteresis;
01: 56LSB;
10=91LSB;
11=137LSB
Page 27
Document Feedback
AS5261 − Application Information
Data Byte
Page 28
Document Feedback
Symbol
Default
0
RED_ADD<0>
0
1
RED_ADD<1>
0
2
RED_ADD<2>
0
3
RED_ADD<3>
0
4
RED_BIT<0>
0
5
RED_BIT<1>
0
6
RED_BIT<2>
0
Redundancy Bit
Identify the position of the
bit to be changed in the byte
at the address
RED_ADD<3:0>
7
CUST_LOCK
0
Lock bit for Customer Area
Description
Redundancy Address
Identify the address of the
byte containing the bit to be
changed
Customer Settings
DATA0 (0x00)
Bit
Number
ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − Application Information
READ / WRITE Register Map
Figure 27:
Read/Write Registers
Data Byte
Bit
Number
Symbol
Default
0
BAUDREG<0>
0
1
BAUDREG<1>
0
2
BAUDREG<2>
0
3
BAUDREG<3>
0
4
BAUDREG<4>
0
5
BAUDREG<5>
0
6
BAUDREG<6>
0
7
BAUDREG<7>
0
0
BAUDREG<8>
0
1
Not used
0
2
Not used
0
3
Not used
0
4
Not used
0
5
Not used
0
6
Not used
0
7
Not used
0
0
Not used
0
1
Not used
0
2
Not used
0
3
Not used
0
4
Not used
0
5
R1K10K<0>
0
6
R1K10K<1>
0
7
DSPRN
0
Description
DATA0 (0x20)
DATA2 (0x22)
ams Datasheet
[v1-04] 2015-Dec-07
A read command returns all
data bits at 0
Read/Write Area
DATA1 (0x21)
UART Baud Rate Register
Selection of the reference
resistance used for OTP
download
Resetn of the Digital Signal
Processing circuit
Page 29
Document Feedback
AS5261 − Application Information
READ Only Register Map
Figure 28:
Read Only Registers
Data Byte
DATA0 (0x28)
Bit
Number
Symbol
Default
0
Not used
0
A read command returns 0
1
OFFSETFINISHED
0
Offset compensation
finished
2
AGCFINISHED
0
AGC loop compensation
finished
3
CORDICOVF
0
Overflow of the CORDIC
4
AGCALARML
0
AGC loop saturation
because of B field too strong
5
AGCALARMH
0
AGC loop saturation
because of B field too weak
OTP_RES
0
7
PARITY_ERR
0
UART parity error flag
0
CORDICOUT<0>
0
1
CORDICOUT<1>
0
2
CORDICOUT<2>
0
3
CORDICOUT<3>
0
4
CORDICOUT<4>
0
5
CORDICOUT<5>
0
6
CORDICOUT<6>
0
7
CORDICOUT<7>
0
Read Area
6
0=1K resistance selected for
OTP download;
1=10K resistance selected
for OTP download
DATA1 (0x29)
Page 30
Document Feedback
Description
CORDIC Output
ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − Application Information
Data Byte
Bit
Number
Symbol
Default
0
CORDICOUT<8>
0
1
CORDICOUT<9>
0
2
CORDICOUT<10>
0
3
CORDICOUT<11>
0
4
CORDICOUT<12>
0
5
CORDICOUT<13>
0
6
Not used
0
7
Not used
0
0
DSPOUT<0>
0
1
DSPOUT<1>
0
2
DSPOUT<2>
0
3
DSPOUT<3>
0
4
DSPOUT<4>
0
5
DSPOUT<5>
0
6
DSPOUT<6>
0
7
DSPOUT<7>
0
0
DSPOUT<8>
0
1
DSPOUT<9>
0
2
DSPOUT<10>
0
3
DSPOUT<11>
0
4
Not used
0
5
Not used
0
6
Not used
0
7
Not used
0
Description
CORDIC Output
DATA2 (0x2A)
A read command returns all
data bits at 0
Read Area
DATA3 (0x2B)
DSP Output
DATA4 (0x2C)
ams Datasheet
[v1-04] 2015-Dec-07
A read command returns all
data bits at 0
Page 31
Document Feedback
AS5261 − Application Information
Data Byte
Bit
Number
Symbol
Default
0
AGCVALUE<0>
0
1
AGCVALUE<1>
0
2
AGCVALUE<2>
0
3
AGCVALUE<3>
0
4
AGCVALUE<4>
0
5
AGCVALUE<5>
0
6
AGCVALUE<6>
0
7
AGCVALUE<7>
0
0
MAG<0>
0
1
MAG<1>
0
2
MAG<2>
0
3
MAG<3>
0
4
MAG<4>
0
5
MAG<5>
0
6
MAG<6>
0
7
MAG<7>
0
0
Not used
0
1
Not used
0
2
Not used
0
3
Not used
0
4
Not used
0
5
Not used
0
6
Not used
0
7
Not used
0
DATA5 (0x2D)
AGC Value
Magnitude of magnetic field
DATA7 (0x2F)
Read Area
DATA6 (0x2E)
Page 32
Document Feedback
Description
A read command returns all
data bits at 0
ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − Application Information
Special Registers
Figure 29:
Special Registers
Data Byte
Bit
Number
Symbol
Default
0
AS5261KEY<0>
0
1
AS5261KEY<1>
0
2
AS5261KEY<2>
0
3
AS5261KEY<3>
0
4
AS5261KEY<4>
0
5
AS5261KEY<5>
0
6
AS5261KEY<6>
0
7
AS5261KEY<7>
0
0
AS5261KEY<8>
0
1
AS5261KEY<9>
0
2
AS5261KEY<10>
0
3
AS5261KEY<11>
0
4
AS5261KEY<12>
0
5
AS5261KEY<13>
0
6
AS5261KEY<14>
0
7
AS5261KEY<15>
0
Description
DATA0 (0x41)
Fuse Register
AS5261 KEY<15:0>=0101
0001 0110 0010
A write command with data
different from AS5261 KEY is
not executed
A read command returns all
data bits at 0
DATA1 (0x42)
ams Datasheet
[v1-04] 2015-Dec-07
Page 33
Document Feedback
AS5261 − Application Information
Data Byte
Bit
Number
Symbol
Default
0
AS5261KEY<0>
0
1
AS5261KEY<1>
0
2
AS5261KEY<2>
0
3
AS5261KEY<3>
0
4
AS5261KEY<4>
0
5
AS5261KEY<5>
0
6
AS5261KEY<6>
0
7
AS5261KEY<7>
0
0
AS5261KEY<8>
0
1
AS5261KEY<9>
0
2
AS5261KEY<10>
0
3
AS5261KEY<11>
0
4
AS5261KEY<12>
0
5
AS5261KEY<13>
0
6
AS5261KEY<14>
0
7
AS5261KEY<15>
0
Description
DATA0 (0x60)
Pass2Func Register
AS5261 KEY<15:0>=0101
0001 0110 0010
A write command with data
different from AS5261 KEY is
not executed
A read command returns all
data bits at 0
DATA1 (0x61)
Page 34
Document Feedback
ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − Application Information
Programming Procedure
• Pull-Up on out pin
• VDD=5V
• Wait 10ms (after the startup time device enters
communication mode)
• Write command: Trimming bits are written in the OTP RAM
• Read command: All the trimming bits are read back to
check the correctness of the writing procedure.
• Write AS5261KEY in the Fuse register: The OTP RAM
content is permanently transferred into the Poly Fuse
cells.
• Wait 10 ms (fuse time)
• Write command, R1K_10K<1:0>=(11)b: Poly Fuse cells are
downloaded into the RAM memory using a 10K resistance
as reference.
• Wait 5 ms (download time)
• Read R1K_10K register, the expected value is 00b
• Write command, R1K_10K<1:0>=(11)b
• Read R1K_10K register, the expected value is (11)b. NB:
Step11 and Step12 have to be consecutive.
• Read command: all the fused bits downloaded with 10K
resistance are read back.
• Write command, R1K_10K=<1:0>=(10)b: Poly Fuse cells
are downloaded into the RAM memory using a 1K
resistance as reference.
• Wait 5 ms (download time)
• Read R1K_10K register, the expected value is (00)b
• Write command register, R1K_10K<1:0>=(10)b
• Read R1K_10K register, the expected value is (10)b NB:
Step18 and Step19 have to be consecutive.
• Read command: All the fused bits downloaded with 1K
resistance are read back.
• Check that read commands at Steps 5, 13 and 19 are
matching
• Write AS5261 KEY in the Pass2Func register: Device enters
normal mode.
ams Datasheet
[v1-04] 2015-Dec-07
Page 35
Document Feedback
AS5261 − Application Information
Mechanical Data
The internal Hall elements are placed in the center of the
package on a circle with a radius of 1.25mm.
Figure 30:
Hall Element Position
Note(s) and/or Footnote(s):
1. All dimensions in mm.
2. Die thickness 0.150mm nom.
3. Adhesive thickness 0.011mm nom.
4. Spacer thickness 0.178mm typ.
Page 36
Document Feedback
ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − Package Drawings & Markings
Package Drawings & Markings
The device is available in a MLF-16 package.
Figure 31:
Package Drawings and Dimensions
Symbol Min
A
A1
A2
A3
L
L1
L2
Q
b
b1
D
E
e
D1
E1
D2
E2
aaa
bbb
ccc
ddd
eee
fff
N
RoHS
Green
0.80
0
0.50
0.05
0.05
0º
0.35
0.20
4.10
4.10
-
Nom
Max
0.90
0.02
0.65
0.20 REF
0.60
0.15
0.10
0.40
0.25
6.00 BSC
6.00 BSC
1.00 BSC
5.75 BSC
5.75 BSC
4.20
4.20
0.15
0.10
0.10
0.05
0.08
0.10
16
1.00
0.05
1.00
0.70
0.25
0.15
14º
0.45
0.30
4.30
4.30
-
Note(s) and/or Footnote(s):
1. Dimensions and tolerancing confirm to ASME Y14.5M-1994.
2. All dimensions are in miilimeters. Angles are in degrees.
3. Bilaretal coplanarity zone applies to the exposed pad as well as the terminal.
4. Radius on the terminal is optional.
5. N is the total number of terminals.
Figure 32:
Package Marking: YYWWMZZ@
YY
WW
M
ZZ
@
Year
Week
Assembly plant identifier
Assembly traceability code
Sublot identifier
ams Datasheet
[v1-04] 2015-Dec-07
Page 37
Document Feedback
AS5261 − Ordering & Contact Information
Ordering & Contact Information
The devices are available as the standard products shown in
Figure 33.
Figure 33:
Ordering Information
Ordering Code
Description
Package
Delivery Form
AS5261-HMFP
12-bit programmable
redundant angle position
sensor with PWM outputs
MLF 16 6x6
Tape & Reel
AS5261-HMFM
Delivery Quantity
4000 pcs/reel
500 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:
[email protected]
For sales offices, distributors and representatives, please visit:
www.ams.com/contact
Headquarters
ams AG
Tobelbaderstrasse 30
8141 Unterpremstaetten
Austria, Europe
Tel: +43 (0) 3136 500 0
Website: www.ams.com
Page 38
Document Feedback
ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − RoHS Compliant & ams Green Statement
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.
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.
ams Datasheet
[v1-04] 2015-Dec-07
Page 39
Document Feedback
AS5261 − Copyrights & Disclaimer
Copyrights & Disclaimer
Copyright ams AG, Tobelbader Strasse 30, 8141
Unterpremstaetten, Austria-Europe. Trademarks Registered. All
rights reserved. The material herein may not be reproduced,
adapted, merged, translated, stored, or used without the prior
written consent of the copyright owner.
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.
Page 40
Document Feedback
ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − Document Status
Document Status
Document Status
Product Preview
Preliminary Datasheet
Datasheet
Datasheet (discontinued)
ams Datasheet
[v1-04] 2015-Dec-07
Product Status
Definition
Pre-Development
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
Pre-Production
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
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
Discontinued
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
Page 41
Document Feedback
AS5261 − Revision Information
Revision Information
Changes from 1.1 (2012-Oct-31) to current revision 1-04 (2015-Dec-07)
Page
1.1 (2012-Oct-31) to 1-02 (2015-Aug-07)
Content was updated to the latest ams design
Noise Suppressor section was removed
Updated Key Benefits & Features
2
Updated Figure 27
24
Added Mechanical Data section
37
Updated Package Drawings & Markings section
38
Updated Figure 35
39
1-02 (2015-Aug-07) to 1-03 (2015-Dec-03)
Updated Detailed Description
9
Updated Figure 11
11
Updated Figure 16
15
Updated Figure 30
36
1-03 (2015-Dec-03) to 1-04 (2015-Dec-07)
Updated Figure 2
2
Updated Figure 26 [DATA11 (0x0B), DATA12 (0x0C)]
23
Updated Mechanical Data section
36
Note(s) and/or Footnote(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.
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ams Datasheet
[v1-04] 2015-Dec-07
AS5261 − Content Guide
Content Guide
ams Datasheet
[v1-04] 2015-Dec-07
1
2
2
3
General Description
Key Benefits & Features
Applications
Block Diagram
4
4
Pin Assignment
Pin Description
6
Absolute Maximum Ratings
7
7
7
8
8
Electrical Characteristics
Operating Conditions
Magnetic Input Specification
Electrical System Specifications
Timing Characteristics
9
10
10
10
11
12
13
14
15
17
18
Detailed Description
Operation
VDD Voltage Monitor
PWM Output
Programming Parameters
Application Specific Angular Range Programming
Application Specific Programming of the Break Point
Multiple Slope Output
Resolution of Parameters
Hysteresis Function
PWM Output Driver Parameters
19
19
20
20
21
22
22
23
24
30
31
34
36
37
Application Information
Recommended Application Schematic
Programming the AS5261
UART Interface for Programming
Frame Organization
READ
WRITE
Baud Rate Setup
OTP Programming Data
READ / WRITE Register Map
READ Only Register Map
Special Registers
Programming Procedure
Mechanical Data
38
39
40
41
42
43
Package Drawings & Markings
Ordering & Contact Information
RoHS Compliant & ams Green Statement
Copyrights & Disclaimer
Document Status
Revision Information
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