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
•
Great flexibility on angular excursion
Features
•
360º contactless high resolution angular position sensing
•
User programmable start and end point of the
application region
•
Saw tooth mode 1-4 slopes per revolution
•
Clamping levels
•
Transition point
•
Broken GND and VDD detection for all external load cases
•
12-Bit pulse width modulated (PWM) output
•
Wide temperature range: - 40°C to 150°C
•
Small Pb-free package: MLF 16 6x6 (with dimple)
•
Simple programming
•
Failure diagnostics
•
High-Resolution output signal
•
Ideal for applications in harsh
environments due to contactless
position sensing
•
Stacked die redundant approach
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
VDD_T
VDD_B
High Voltage/
Reverse Polarity
Protection
AS5261
Sin
Cos
Hall Array
Frontend
Amplifier
ADC
DSP
CORDIC
Controller
12
PWM
OUT_T
LS Driver
Single Pin
Interface
(UART)
OUT_B
OTP Register
(Programming
Parameters)
GND_B
GND_T
ams Datasheet
[v1-04] 2015-Dec-07
Page 3
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AS5261 −
Pin Assignment
Pin Assignment
Figure 4:
MLF-16 Pin Configuration (Top View)
OUT_B
VDD_B
16
TP1_T
TP1_B
VDD3V3_T
VDD3V3_B
1
2
3
4
5
GND_T
OUT_T
Pin Description
Figure 5:
MLF-16 Pin Description
VDD_T
15
Epad
6
GND_B
14
13
12
S_B
11
S_T
10
TP3_B
9
TP3_T
7
TP2_T
8
TP2_B
Pin
Number
1
2
3
4
5
6
Pin Name
TP1_T
Pin Type
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.
DIO/AIO
Multi purpose pin
TP1_B
VDD3V3_T
AIO
VDD3V3_B
GND_T
Supply pin
GND_B
Output of the LDO. 1μF required.
Ground pin. Connected to ground in the application.
Ground pin. Connected to ground in the application.
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ams Datasheet
[v1-04] 2015-Dec-07
AS5261 −
Pin Assignment
Pin
Number
7
8
9
10
11
Pin Name
TP2_T
TP2_B
TP3_T
TP3_B
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. Left open in the application.
Test pin for fabrication. Left open 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
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
VDD_B
Positive supply pin. This pin is over voltage protected.
13
14
15
OUT_T
OUT_B
VDD_T
ams Datasheet
[v1-04] 2015-Dec-07
Page 5
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