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Datasheet: AS5161 12-Bit Magnetic Angle Position Sensor
Please be patient while we update our brand image as
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AS5161
12-Bit Magnetic Angle Position Sensor
www.ams.com Revision 1.1 1 - 35
1 General Description
The AS5161 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 pulse width modulated
(PWM) output.
The AS5161 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 AS5161 and magnet
2 Key Features
360º contactless high resolution angular position sensing
User programmable start and end point of the application region
+ linearization.
User programmable clamping levels and programming of the
transition point.
Digital PWM output
- Short circuit monitor
- High driving capability for resistive and capacitive loads
Wide temperature range: - 40°C to + 150°C
Small Pb-free package: SOIC 8.
Broken GND and VDD detection over a wide range of different
load conditions.
Saw tooth mode 1,2,3,4 slopes per revolution
3 Benefits
Unique fully differential patented solution
Best protections for automotive applications
Easy to program
Additional linearization points for output characteristic
Ideal for applications in harsh environments due to contactless
position sensing
Robust system, tolerant to magnet misalignment, air gap
variations, temperature variations and external magnetic fields
High inherent accuracy
Broken GND and VDD detection for all external load cases
4 Applications
The AS5161 is ideal for automotive applications like throttle and
valve position sensing, gearbox position sensor, tumble flap, chassis
height level, pedal position sensing and contactless potentiometers.
AS5161
Datasheet - Contents
www.ams.com Revision 1.1 3 - 35
Contents
1 General Description .................................................................................................................................................................. 1
2 Key Features............................................................................................................................................................................. 1
3 Benefits..................................................................................................................................................................................... 1
4 Applications............................................................................................................................................................................... 1
5 Pin Assignments ....................................................................................................................................................................... 4
5.1 Pin Descriptions.................................................................................................................................................................................... 4
6 Absolute Maximum Ratings ...................................................................................................................................................... 5
7 Electrical Characteristics........................................................................................................................................................... 6
7.1 Operating Conditions............................................................................................................................................................................ 6
7.2 Magnetic Input Specification................................................................................................................................................................. 6
7.3 Electrical System Specifications........................................................................................................................................................... 7
7.4 Timing Characteristics .......................................................................................................................................................................... 8
7.5 Power Management - Supply Monitor .................................................................................................................................................. 8
8 Detailed Description.................................................................................................................................................................. 9
8.1 Operation.............................................................................................................................................................................................. 9
8.1.1 VDD Voltage Monitor ................................................................................................................................................................... 9
8.2 PWM Output ....................................................................................................................................................................................... 10
8.2.1 Programming Parameters.......................................................................................................................................................... 10
8.2.2 Application Specific Angular Range Programming .................................................................................................................... 11
8.2.3 Application Specific Programming of the Break Point ............................................................................................................... 11
8.2.4 Multiple Slope Output ................................................................................................................................................................ 12
8.2.5 Linearization of the Output......................................................................................................................................................... 13
8.2.6 Resolution of Parameters .......................................................................................................................................................... 13
8.3 PWM Output Driver Parameters......................................................................................................................................................... 15
8.3.1 Noise Suppressor ...................................................................................................................................................................... 15
8.3.2 Hysteresis Function ................................................................................................................................................................... 15
9 Application Information ........................................................................................................................................................... 16
9.1 Recommended Application Schematic............................................................................................................................................... 16
9.2 Programming the AS5161 .................................................................................................................................................................. 17
9.2.1 UART Interface for Programming .............................................................................................................................................. 17
9.2.2 Frame Organization ................................................................................................................................................................... 17
9.2.3 WRITE (Command Description) ................................................................................................................................................ 19
9.2.4 READ (Command Description).................................................................................................................................................. 20
9.2.5 Baud-rate Automatic Detection.................................................................................................................................................. 20
9.2.6 Baud-rate Manual Setting (optional) .......................................................................................................................................... 20
9.3 OTP Programming Data ..................................................................................................................................................................... 22
9.4 READ / WRITE Register Map............................................................................................................................................................. 26
9.5 READ Only Register Map................................................................................................................................................................... 27
9.6 Special Registers................................................................................................................................................................................ 29
9.7 Programming Procedure .................................................................................................................................................................... 30
10 Package Drawings and Markings ......................................................................................................................................... 31
11 Ordering Information ............................................................................................................................................................. 34
AS5161
Datasheet - Pin Assignments
www.ams.com Revision 1.1 4 - 35
5 Pin Assignments
Figure 3. SOIC-8 Pin Configuration
5.1 Pin Descriptions
Table 1. SOIC-8 Pin Descriptions
Pin Number Pin Name Pin Type Description
1 VDD Supply pin Positive supply pin. This pin is over voltage protected.
2TP1 DIO/AIO
multi purpose pin Test pin for fabrication. Connected to ground in the application board.
3 VDD3V3 AIO Output of the internal voltage regulator
4 GND Supply pin Ground pin. Connected to ground in the application.
5TP2 DIO/AIO
multi purpose pin Test pin for fabrication. Connected to ground in the application board.
6TP3 DIO/AIO
multi purpose pin Test pin for fabrication. Open in the application.
7S AIO
Test pin for fabrication. Connected to OUT in the application board.
8OUT DIO/AIO
multi purpose pin
Digital PWM output pin. Over this pin the programming is possible. Open drain
configuration.
VDD
TP1
VDD3V3
GND TP2
TP3
S
OUT
5
6
7
8
AS5161
2
3
4
1
AS5161
Datasheet - Absolute Maximum Ratings
www.ams.com Revision 1.1 5 - 35
6 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 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 on page 6 is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Table 2. 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
Vdiff Voltage difference at pin VDD and OUT -20 20 V
VDD3V3 DC supply voltage at pin VDD3V3 -0.3 5 V
Iscr Input current (latchup immunity) -100 100 mA Norm: AEC-Q100-004
Electrostatic Discharge
ESD Electrostatic discharge ±2 kV Norm: AEC-Q100-002
Temperature Ranges and Storage Conditions
Tstrg Storage temperature -55 +150 ºC Min -67ºF; Max +257ºF
TBody Body temperature 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).
H Humidity non-condensing 5 85 %
MSL Moisture Sensitive Level 3 Represents a maximum floor life time of 168h
AS5161
Datasheet - Electrical Characteristics
www.ams.com Revision 1.1 6 - 35
7 Electrical Characteristics
7.1 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.
7.2 Magnetic Input Specification
TAMB = -40 to +150ºC, VDD = 4.5 to 5.5V (5V operation), unless otherwise noted.
Two-pole cylindrical diametrically magnetized source:
Table 3. Operating Conditions
Symbol Parameter Conditions Min Typ Max Units
TAMB Ambient temperature -40 +150 ºC
Isupp Supply current 10 mA
VDD Supply voltage at pin VDD 4.5 5.0 5.5 V
Table 4. Magnetic Input Specification
Symbol Parameter Conditions Min Typ Max Units
Bpk 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
30 70 mT
Bpkext 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.
10 90 mT
Boff Magnetic offset Constant magnetic stray field ± 5 mT
Disp Displacement radius
Offset between defined device center and
magnet axis. Including
Eccentricity.Dependent on the selected
magnet.
1mm
AS5161
Datasheet - Electrical Characteristics
www.ams.com Revision 1.1 7 - 35
7.3 Electrical System Specifications
TAMB = -40 to +150ºC, VDD = 4.5 - 5.5V (5V operation), Magnetic Input Specification, unless otherwise noted.
Figure 4. Power-up timing Diagram
Table 5. Electrical System Specifications
Symbol Parameter Conditions Min Typ Max Units
RES 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
INL Integral non-linearity
Best aligned reference magnet over
temperature -40 -150º over full turn 360º
and displacement
1.4 deg
DNL Differential non-linearity Monolitic 0.05 deg
ON Output noise (360º segment) 1 LSB after filter peak/peak rms value 0.2 % DC
tPwrUp Power-up time 0-5V See Figure 4 10 ms
tdelay
System propagation delay
absolute output: delay of ADC,
DSP and absolute interface
10kOhm, 100 µF RC filter 300 µs
OUT pin in HiZ First Valid Data on OUT pin
tPwrUp
4.5V
VDD
AS5161
Datasheet - Electrical Characteristics
www.ams.com Revision 1.1 8 - 35
7.4 Timing Characteristics
7.5 Power Management - Supply Monitor
Table 6. Timing Conditions
Symbol Parameter Conditions Min Typ Max Units
TDETWD WachDog error detection time 12 ms
Table 7. Power Management - Supply Monitor Conditions
Symbol Parameter Conditions Min Typ Max Units
VDDUVTH VDD undervoltage upper threshold 3.5 4.0 4.5 V
VDDUVTL VDD undervoltage lower threshold 3.0 3.5 4.0 V
VDDUVHYS VDD undervoltage hysteresis 300 500 900 mV
VDDUVDET VDD undervoltage detection time 10 50 250 µs
VDDUVREC VDD undervoltage recovery time 10 50 250 µs
VDDOVTH VDD overvoltage upper threshold 6.0 6.5 7.0 V
VDDOVTL VDD overvoltage lower threshold 5.5 6 6.5 V
VDDOVHYS VDD overvoltage hysteresis 300 500 900 mV
ANATOVDET VDD overvoltage detection time (analog
path) 10 50 250 µs
ANATOVREC VDD overvoltage recovery time (analog
path) 10 50 250 µs
AS5161
Datasheet - Detailed Description
www.ams.com Revision 1.1 9 - 35
8 Detailed Description
The AS5161 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.
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 AS5161 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 AS5161 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.
Two additional linearization points can be used to improve the system linearity. These points C1 and C2 are programmable.
The output parameters can be programmed in an OTP register. No additional voltage is required to program the AS5161. 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 AS5161 is tolerant to magnet misalignment and unwanted external magnetic fields due to differential measurement technique and Hall
sensor conditioning circuitry.
8.1 Operation
8.1.1 VDD Voltage Monitor
VDD Over Voltage Management. If the supply voltage at pin VDD 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 pin VDD 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.
AS5161
Datasheet - Detailed Description
www.ams.com Revision 1.1 10 - 35
8.2 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 20 V 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 Table 9)
8.2.1 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:
These parameters are input parameters. Using the available programming software and programmer these parameters are converted and finally
written into the AS5161 128 bit OTP memory.
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)
C1 Calibration Point 1
C2 Calibration Point 2
C1Y Trim value for C1
C2Y Trim value for C2
AS5161
Datasheet - Detailed Description
www.ams.com Revision 1.1 11 - 35
8.2.2 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 AS5161. The clamping levels
CLL and CLH can be programmed independent from the T1 and T2 position and both levels can be separately adjusted.
Figure 5. Programming of an Individual Application Range
Figure 5 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 0 degree. 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.
8.2.3 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 6. Individual Programming of the Break Point BP
AS5161
Datasheet - Detailed Description
www.ams.com Revision 1.1 12 - 35
8.2.4 Multiple Slope Output
The AS5161 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.
Figure 7. Two Slope Mode
Figure 8. Four Slope Mode
Duty Cycle
0
100 % DC
360
Duty Cycle
0
100 % DC
360
AS5161
Datasheet - Detailed Description
www.ams.com Revision 1.1 13 - 35
8.2.5 Linearization of the Output
To improve the system linearity an additional 2 point linearization function is implemented in the AS5161.
Figure 9. Linearization of the Output Characteristic
8.2.6 Resolution of Parameters
The programming parameters have a wide resolution of up to 14 bits.
Table 8. Resolution of the Programming Parameters
Symbol Parameter Resolution Note
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
BP Break point 14 bits
C1 Calibration Point 1 4 bits
C2 Calibration Point 2 4 bits
C1Y Trim value C1 3 bits
C2Y Trim value C2 3 bits
T1 T2
100 % DC
0
T1Y
T2Y
CLL
CLH
C1 C2
C1Y
C2Y
AS5161
Datasheet - Detailed Description
www.ams.com Revision 1.1 14 - 35
Figure 10. Overview of the Output Range
Figure 10 gives an overview of the different ranges. The failure bands are used to indicate a wrong operation of the AS5161. 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.
Clamping Region Low
Failure Band Low
0
4
CLL
CLH
96
100
Output Signal in % Duty Cycle
Failure Band High
Application Region
Clamping Region High
T2Y
T1Y
AS5161
Datasheet - Detailed Description
www.ams.com Revision 1.1 15 - 35
For efficient use of diagnostics, it is recommended to program to clamping levels CLL and CLH.
8.3 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>.
CLOAD≤ 33 nF, RPU= 1k…10kΩ
8.3.1 Noise Suppressor
The noise suppressor is inserted after the angle calculation (first stage) and after range expansion (second stage). This function is capable to
reduce the noise level down to 1 LSB peak to peak over different programing ranges.
4 possible configurations of the noise suppressor can be selected via the OTP bits FILTERCFG<1:0>.
8.3.2 Hysteresis Function
AS5161 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>.
Table 9. Different Failure Cases of AS5161
Type Failure Mode Symbol Failure Band Note
Internal alarms (failures)
Out of magnetic range
(too less or too high magnetic input) 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
Application related
failures
Overvoltage condition OV
High Dependant on the load resistor
Pull up → failure band high
Broken VDD BVDD
Broken VSS BVSS
Short circuit output SCO High Switch off → short circuit dependent
Table 10. 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 0PWMF<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
124V / µs
AS5161
Datasheet - Application Information
www.ams.com Revision 1.1 16 - 35
9 Application Information
9.1 Recommended Application Schematic
Figure 11 shows the recommended schematic in the application. All components marked with (*) are optional and can be used to further increase
the EMC.
Figure 11. Recommended Schematic Pull-Up Configuration
Table 11. External Components
Symbol Parameter Min Typ Max Unit Note
C1VDD buffer capacitor 0.8 1 1.2 µF Low ESR 0.3 Ω
C2VDD3V3 regulator capacitor 0.8 1 1.2 µF Low ESR 0.3 Ω
C3OUT load capacitor (sensor PCB) 0 4.7 nF
C4*VDD capacitor (optional) 4.7 nF Do not increase due to
programming over output.
R1*VDD serial resistor (optional) 10 Ω
CLOUT load capacitor (ECU) 0 33 nF
RLPU OUT pull-up resistance 1 10 kΩ
AS5161
VDD
TP1
VDD3V3
GND TP2
TP3
S
OUT
Sensor PCB
C1
Electric Control Unit
C2
C3
C4*
R1*RLPU
CL
VDD
GND
OUT
AS5161
Datasheet - Application Information
www.ams.com Revision 1.1 17 - 35
9.2 Programming the AS5161
The AS5161 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 AS5161 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.
9.2.1 UART Interface for Programming
The AS5161 uses a standard UART interface with an address byte and two data bytes. The read or write mode is selected with bit R/Wn in the
first byte. The timing (baudrate) is selected by the AS5161 over a synchronization frame. The baud rate register can be read and overwritten
(optional). Every start bit is used for synchronisation.
A time out function detects not complete commands and resets the AS5161 UART after the timeout period.
9.2.2 Frame Organization
Each frame is composed by 24 bits. The first byte of the frame specifies the read/write operation with the register address. 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
AS5161 can operate in slave communication or master communication mode. In the slave communication mode the AS5161 receives the data.
The programming tool is the driver of the single communication line. In case of the master communication mode the AS5161 transmits data in
the frame format. The single communication line can be pulled down by the AS5161.
The UART frame consists of 1 start bit (low level), 8 data bit, 1 even-parity bit and 1 stop bit (high level). Data are transferred from LSB to MSB
Figure 12. General UART Frame
Table 12. Bit Timing
Symbol Parameter Min Typ Max Unit Note
START Start bit 1 TBIT
Dx Data bit 1 TBIT
PAR Parity bit 1 TBIT
STOP Stop bit 1 TBIT
TSW Slave/Master Switch Time 7 TBIT
D0 D1 D2 D3 D4 D5 D6 D7 parstart stop
AS5161
Datasheet - Application Information
www.ams.com Revision 1.1 18 - 35
Each communication starts with the reception of a request from the external controller. The request consists of two frames: one synchronization
frame and the command frame.
The synchronization frame contains the data 0x55 and allows the UART to measure the external controller baud rate:
Figure 13. Synchronization Frame
The second frame contains the command Read/ Write (1 bit) and the address (7 bits):
Figure 14. Address and Command Frame
Only two commands are possible. In case of read command the idle phase between the command and the answer is the time TSW. In case of
parity error command is not executed.
Notes:
1. In case of Write command the request is followed by the frames containing the data to write.
2. In case of Read command the communication direction will change and the AS5161 will answer with the frames containing the
requested data.
Table 13. Possible Commands
Possible Interface
Commands Description AS5X63
Communication Mode
Command
CMD
WRITE Write data to the OTP memory or Registers SLAVE 0
READ Read data to the OTP memory or Registers SLAVE & MASTER 1
start stopD0 D1 D2 D3 D4 D5 D6 D7 par
AD
3
AD
4
AD
5
AD
6R/Wn parstart stop
AD
0
AD
1
AD
2
AS5161
Datasheet - Application Information
www.ams.com Revision 1.1 19 - 35
9.2.3 WRITE (Command Description)
Figure 15. Full Write Command
Writing the AS5161 KEY in the fuse register (address 0x41) triggers the transfer of the data from the OTP RAM into the Poly Fuse cell.
Writing the AS5161 KEY in the Pass2Func Register (address 0x60) forces the device into normal mode.
AD0 AD1 AD2 AD3 AD4 parstart stop
AD5 AD6 R/
Wn
Write command frame
parstart stop
D00 D01 D02 D03 D05 D06 D07
Data1 frame (data to write on address AD<6:0>+1)
D04
parstart stop
D00 D01 D02 D03 D05 D06 D07
Data0 frame (data to write on address AD<6:0>)
D04
start stopD0 D1 D2 D3 D4 D5 D6 D7 par
Synchronization frame
AS5161
Datasheet - Application Information
www.ams.com Revision 1.1 20 - 35
9.2.4 READ (Command Description)
Figure 16. Full Read Command
9.2.5 Baud-rate Automatic Detection
The UART includes a built-in baud-rate monitor that uses the synchronization frame to detect the external controller baud-rate. This baud-rate is
used after the synchronization byte to decode the following frame and to transmit the answer and it is stored in the BAUDREG register.
9.2.6 Baud-rate Manual Setting (optional)
The BAUDREG register can be read and over-written for a possible manual setting of the baud-rate: in case the register is overwritten with a
value different from 0, this value will be used for the following UART communications and the synchronization frame must be removed from the
request.
start stopD0 D1 D2 D3 D4 D5 D6 D7 par
Synchronization frame:
AD0 AD1 AD2 AD3 AD4 parstart stop
AD5 AD6 R/Wn
Read command frame:
parstart stop
D00 D01 D02 D03 D05 D06 D07
Data0 frame (data read from address AD<6:0>) (MASTER):
D04
parstart stop
D00 D01 D02 D03 D05 D06 D07
Data1 frame (data read from address AD<6:0>+1) (MASTER):
D04
AS5161
Datasheet - Application Information
www.ams.com Revision 1.1 21 - 35
Figure 17. Manual Baud-rate Setting
Figure 18. Simple Read and Write
00
MSB
LSB
WR BAUDREG
Address
P
Start
R/n
Stop
S 0 01 10 10 1
MSB
LSB
High Byte
P
Start
Stop
S 0 00 00 00 0
MSB
LSB
Low Byte
Start
Stop
S P
AS5161 in Receiving Mode (Write Access)
Even Parity
0
Even Parity
Even Parity
01 01 01 01 0
MSB
LSB
IDLE
synch frame
P
Start
R/n
Stop
S
Even Parity
IDLE IDLE IDLE IDLE
1
MSB
LSB
IDLE
Reg. Address
P
Start
R/Wn
Stop
S
MSB
LSB
High Byte
P
Start
Stop
S
MSB
LSB
Low Byte
Start
Stop
IDLES P
AS5161 in Receiving
Mode AS5161 in transmitting mode (Read Access)
Even Parity
Even Parity
Even Parity
IDLE IDLE
0
MSB
LSB
IDLE
Reg. Address
P
Start
R/n
Stop
S
MSB
LSB
High Byte
P
Start
Stop
S
MSB
LSB
Low Byte
Start
Stop
IDLES P
AS5161 in Receiving
Mode AS5161 in Receiving Mode (Write Access)
Even Parity
Even Parity
Even Parity
IDLE IDLE
AS5161
Datasheet - Application Information
www.ams.com Revision 1.1 22 - 35
9.3 OTP Programming Data
Table 14. OTP Memory Map
Data Byte Bit Number Symbol Default Description
DATA15 (0x0F)
0
Factory Settings
0
AMS (reserved)
Factory Settings
10
20
30
40
50
60
70
DATA14 (0x0E)
00
10
20
30
40
50
60
70
DATA13 (0x0D)
00
10
2 CUSTID<0> 0
Customer Identifier
Customer Settings
3 CUSTID<1> 0
4 CUSTID<2> 0
5 CUSTID<3> 0
6 CUSTID<4> 0
7 CUSTID<5> 0
DATA12 (0x0C)
0 CUSTID<6> 0
1X2LIN<0>0
Second linearization point (X-axis)
2X2LIN<1>0
3X2LIN<2>0
4X2LIN<3>0
5X1LIN<0>0
First linearization point (X-axis)
6X1LIN<1>0
7X1LIN<2>0
DATA11 (0x0B) 0X1LIN<3>0
1 Y1LIN<0> 0 First linearization point (Y-axis)
AS5161
Datasheet - Application Information
www.ams.com Revision 1.1 23 - 35
2Y1LIN<1>0
First linearization point (Y-axis)
Customer Settings
3Y1LIN<2>0
4Y2LIN<0>0
Second linearization point (Y-axis)5Y2LIN<1>0
6Y2LIN<2>0
7CLH<0>0
Clamping Level High
DATA10 (0x0A)
0CLH<1>0
1CLH<2>0
2CLH<3>0
3CLH<4>0
4CLH<5>0
5CLH<6>0
6CLH<7>0
7CLH<8>0
DATA9 (0x09)
0 CLL<0> 0
Clamping Level Low
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
DATA8 (0x08)
0 CLL<8> 0
1 OFFSET<0> 0
Offset
2 OFFSET<1> 0
3 OFFSET<2> 0
4 OFFSET<3> 0
5 OFFSET<4> 0
6 OFFSET<5> 0
7 OFFSET<6> 0
DATA7 (0x07)
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
Table 14. OTP Memory Map
Data Byte Bit Number Symbol Default Description
AS5161
Datasheet - Application Information
www.ams.com Revision 1.1 24 - 35
DATA6 (0x06)
0 OFFSET<15> 0
Offset
Customer Settings
1 OFFSET<16> 0
2 OFFSET<17> 0
3 OFFSET<18> 0
4 OFFSET<19> 0
5GAIN<0>0
Scale Factor
6GAIN<1>0
7GAIN<2>0
DATA5 (0x05)
0GAIN<3>0
1GAIN<4>0
2GAIN<5>0
3GAIN<6>0
4GAIN<7>0
5GAIN<8>0
6GAIN<9>0
7 GAIN<10> 0
DATA4 (0x04)
0GAIN<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
Break Point
7 BP<1> 0
DATA3 (0x003)
0 BP<2> 0
1 BP<3> 0
2 BP<4> 0
3 BP<5> 0
4 BP<6> 0
5 BP<7> 0
6 BP<8> 0
7 BP<9> 0
DATA2 (0x02)
0 BP<10> 0
1 BP<11> 0
2 BP<12> 0
3 BP<13> 0
4 ANGLERNG 0
Sector selection
0=Angular Sector≥22.5 degrees;
1=Angular Sector<22.5 degrees
5DIAG_HIGH0
Failure Band Selection
0=Failure Band Low 1=Failure Band
High
Table 14. OTP Memory Map
Data Byte Bit Number Symbol Default Description
AS5161
Datasheet - Application Information
www.ams.com Revision 1.1 25 - 35
DATA2 (0x02)
6 QUADEN<0> 0 Quadrant Mode Enable
00=1quadrant;01=2quadrants;
10=3 quadrants;11=4 quadrants
Customer Settings
7 QUADEN<1> 0
DATA1 (0x01)
0 AIRGAPSEL 0 Magnetic input range extension
0:extended range;1=normal range
1 HYSTSEL<0> 0 Hysteresis selection
00=no hysteresis; 01: 56LSB;
10=91LSB; 11=137LSB
2 HYSTSEL<1> 0
3 FILTERCFG<0> 0 Filter Configuration
00=no filter; 01= fast;
10=moderate; 11=slow
4 FILTERCFG<1> 0
5 Not used 0
6 Not used 0
7 Not used 0
DATA0 (0x00)
0RED_ADD<0>0
Redundancy Address
Identify the address of the byte
containing the bit to be changed
1RED_ADD<1>0
2RED_ADD<2>0
3RED_ADD<3>0
4RED_BIT<0>0 Redundancy Bit
Identify the position of the bit to be
changed in the byte at the address
RED_ADD<3:0>
5RED_BIT<1>0
6RED_BIT<2>0
7 CUST_LOCK 0 Lock bit for Customer Area
Table 14. OTP Memory Map
Data Byte Bit Number Symbol Default Description
AS5161
Datasheet - Application Information
www.ams.com Revision 1.1 26 - 35
9.4 READ / WRITE Register Map
Table 15. Read / Write Registers
Data Byte Bit Number Symbol Default Description
DATA0 (0x20)
0 BAUDREG<0> 0
UART Baud Rate Register
Read/Write Area
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
DATA1 (0x21)
0 BAUDREG<8> 0
1 Not used 0
A read command returns all data bits
at 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
DATA2 (0x22)
0 Not used 0
1 Not used 0
2 Not used 0
3 Not used 0
4 Not used 0
5 R1K10K<0> 0 Selection of the reference resistance
used for OTP download
6 R1K10K<1> 0
7 DSPRN 0 Resetn of the Digital Signal Processing
circuit
AS5161
Datasheet - Application Information
www.ams.com Revision 1.1 27 - 35
9.5 READ Only Register Map
Table 16. Read Only Registers
Data Byte Bit Number Symbol Default Description
DATA0 (0x28)
0 Not used 0 A read command returns 0
Read Area
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
6OTP_RES0
0=1K resistance selected for OTP
download;
1=10K resistance selected for OTP
download
7 PARITY_ERR 0 UART parity error flag
DATA1 (0x29)
0 CORDICOUT<0> 0
Cordic Output
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
DATA2 (0x2A)
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 A read command returns all data bits
at 0
7 Not used 0
DATA3 (0x2B)
0DSPOUT<0>0
DSP Output
1DSPOUT<1>0
2DSPOUT<2>0
3DSPOUT<3>0
4DSPOUT<4>0
5DSPOUT<5>0
6DSPOUT<6>0
7DSPOUT<7>0
AS5161
Datasheet - Application Information
www.ams.com Revision 1.1 28 - 35
DATA4 (0x2C)
0DSPOUT<8>0
DSP Output
Read Area
1DSPOUT<9>0
2 DSPOUT<10> 0
3 DSPOUT<11> 0
4 Not used 0
A read command returns all data bits
at 0
5 Not used 0
6 Not used 0
7 Not used 0
DATA5 (0x2D)
0 AGCVALUE<0> 0
AGC Value
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
DATA6 (0x2E)
0MAG<0>0
Magnitude of magnetic field
1MAG<1>0
2MAG<2>0
3MAG<3>0
4MAG<4>0
5MAG<5>0
6MAG<6>0
7MAG<7>0
DATA7 (0x2F)
0 Not used 0
A read command returns all data bits
at 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
Table 16. Read Only Registers
Data Byte Bit Number Symbol Default Description
AS5161
Datasheet - Application Information
www.ams.com Revision 1.1 29 - 35
9.6 Special Registers
Table 17. Special Registers
Data Byte Bit Number Symbol Default Description
DATA0 (0x41)
0 AS5161KEY<0> 0
AS5161 KEY<15:0>=0101 0001 0110
0010
A write command with data different
from AS5161 KEY is not executed
A read command returns all data bits
at 0
Fuse Register
1 AS5161KEY<1> 0
2 AS5161KEY<2> 0
3 AS5161KEY<3> 0
4 AS5161KEY<4> 0
5 AS5161KEY<5> 0
6 AS5161KEY<6> 0
7 AS5161KEY<7> 0
DATA1 (0x42)
0 AS5161KEY<8> 0
1 AS5161KEY<9> 0
2 AS5161KEY<10> 0
3 AS5161KEY<11> 0
4 AS5161KEY<12> 0
5 AS5161KEY<13> 0
6 AS5161KEY<14> 0
7 AS5161KEY<15> 0
DATA0 (0x60)
0 AS5161KEY<0> 0
AS5161 KEY<15:0>=0101 0001 0110
0010
A write command with data different
from AS5161 KEY is not executed
A read command returns all data bits
at 0
Pass2Func Register
1 AS5161KEY<1> 0
2 AS5161KEY<2> 0
3 AS5161KEY<3> 0
4 AS5161KEY<4> 0
5 AS5161KEY<5> 0
6 AS5161KEY<6> 0
7 AS5161KEY<7> 0
DATA1 (0x61)
0 AS5161KEY<8> 0
1 AS5161KEY<9> 0
2 AS5161KEY<10> 0
3 AS5161KEY<11> 0
4 AS5161KEY<12> 0
5 AS5161KEY<13> 0
6 AS5161KEY<14> 0
7 AS5161KEY<15> 0
AS5161
Datasheet - Application Information
www.ams.com Revision 1.1 30 - 35
9.7 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 AS5161KEY 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 AS5161KEY in the Pass2Func register: Device enters normal mode.
AS5161
Datasheet - Package Drawings and Markings
www.ams.com Revision 1.1 31 - 35
10 Package Drawings and Markings
The device is available in a SOIC 8 - Lead 150 MIL Package.
Figure 19. Package Drawings and Dimensions
Notes:
1. Dimensions and tolerancing confirm to ASME Y14.5M-1994.
2. All dimensions are in miilimeters. Angles are in degrees.
Marking: YYWWMZZ.
YY WW MZZ
Year Week Assembly plant identifier Assembly traceability code
Symbol Min Nom Max
A- -1.75
A1 0.10 - 0.25
A2 1.25 - -
b 0.31 - 0.51
c 0.17 - 0.25
D - 4.90 BSC -
E - 6.00 BSC -
E1 - 3.90 BSC -
e - 1.27 BSC -
L 0.40 - 1.27
L1 - 1.04 REF -
L2 - 0.25 BSC -
Symbol Min Typ Max
R0.07 - -
R1 0.07 - -
h0.25-0.50
Θ0º - 8º
Θ1 5º - 15º
Θ20º - -
aaa - 0.10 -
bbb - 0.20 -
ccc - 0.10 -
ddd - 0.25 -
eee - 0.10 -
fff - 0.15 -
N-8-
AS5161
Datasheet - Ordering Information
www.ams.com Revision 1.1 34 - 35
11 Ordering Information
The devices are available as the standard products shown in Table 18.
Note: All products are RoHS compliant and ams green.
Buy our products or get free samples online at www.ams.com/ICdirect
Technical Support is available at www.ams.com/Technical-Support
For further information and requests, email us at sales@ams.com
(or) find your local distributor at www.ams.com/distributor
Table 18. Ordering Information
Ordering Code Description Delivery Form Package
AS5161-HSOP, -HSOM 12-Bit Programmable Angle Position Sensor with PWM output Tape&Reel SOIC - 8
AS5161
Datasheet - Copyrights
www.ams.com Revision 1.1 35 - 35
Copyrights
Copyright © 1997-2012, ams AG, Tobelbaderstrasse 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.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. ams AG makes no
warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described
devices from patent infringement. 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 normal
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. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard
production flow, such as test flow or test location.
The information furnished here by ams AG is believed to be correct and accurate. However, 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.
Contact Information
Headquarters
ams AG
Tobelbaderstrasse 30
A-8141 Unterpremstaetten, Austria
Tel : +43 (0) 3136 500 0
Fax : +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
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