AS5403A/D/E
3D Hall Position Sensor for Linear and
Off-Axis Applications
General Description
The AS5403 can measure magnetic fields components in all
three dimensions and converts the magnetic field information
into absolute position information.
Only a simple 2-pole magnet is required as the magnetic field
source.
Using two 3D-Hall cells allows absolute (single pixel) as well as
differential (double pixel) 3D magnetic field measurement.
The differential measurement makes the AS5403 ideal for use
in rough automotive position sensing applications that include
not only dust, dirt or moisture but also unwanted magnetic
stray fields.
All the signal conditioning, including compensation of
temperature effects as well as linearization of the output is
included in the IC.
The absolute position information of the magnet is directly
accessible over a SPI interface and a programmable PWM or
analog output. The build in diagnostic functions makes the
AS5403 suitable for safety critical applications.
The AS5403 is available in a 14-pin TSSOP package and is
qualified according AEC-Q100 for an ambient temperature
range from -40°C to 150°C. It operates at a supply voltage of 5V
±10%.
The programming of the AS5403 is done over the single wire
UART interface.
The AS5403 is overvoltage protected up to 18V on the supply
and output pins. In addition the supply pins are reverse polarity
protected up to -18V.
Ordering Information
and
Content Guide
appear at end of
datasheet.
ams Datasheet
[v1-06] 2015-Aug-28
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AS5403A/D/E −
General Description
Key Benefits & Features
The benefits and features of AS5403A/D/E, 3D Hall Position
Sensor for Linear and Off-Axis Applications are listed below:
Figure 1:
Added Value of Using AS5403A/D/E
Benefits
High flexibility in magnet selection
Suppression against magnetic stray fields
Suitable for high temperature applications
Flexibility in choice of interface
Best in class performance parameters
Flexible mechanical arrangement of magnet
External calculations of raw data
High linearity after teaching
Supporting safety critical applications
Features
High magnetic input range
Dual 3D pixel principle
Temperature range from -40 to 150°C (ambient)
Analog or PWM output, SPI as alternative
Offset and sensitivity accuracy over temperature
Flexible configuration registers
3D raw data assessment possible
33 linearization points
Integrated diagnostic functions
Applications
Linear position:
•
Clutch/brake pedal
•
Gearbox sensor
Off-Axis:
•
Steering angle sensor
•
Gearbox shift link
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ams Datasheet
[v1-06] 2015-Aug-28
AS5403A/D/E −
General Description
Figure 2:
Typical Set-Up of AS5403A/D With Magnet (Linear)
Figure 3:
Typical Set-Up of AS5403E With Magnet (Off-Axis)
ams Datasheet
[v1-06] 2015-Aug-28
Page 3
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AS5403A/D/E −
General Description
Block Diagram
The functional blocks of this device for reference are
shown below:
Figure 4:
AS5403A/D/E Block Diagram
VDD3V
AS5403
VDD
LDO
Temperature
Sensor
Diagnostics
SPI
SCS
SCLK
SDO
SDI
E²PROM
3DHall
Cell
#0
3DHall
Cell
#1
X
Y
Z
M
U
X
X
Y
Z
ADC
signal
conditioning
Bi
Bj
Linearization
ATAN
and
(CORDIC)
Output setting
DAC
OUT
PWM
DSW
GND
3D Hall pixels:
MUX:
ADC:
Signal conditioning:
Bi/Bj:
ATAN:
Linearization:
Temperature:
PWM interface:
SPI interface:
E²PROM:
Diagnostics:
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The AS5403 contains two 3D Hall pixels, spaced 2.5mm apart.
The multiplexer pre-selects depending on the AS5403 variant and chosen mode
two/four magnetic components.
The Sigma-Delta ADC samples the Hall sensors signals selected by the MUX. The
sampling of the sensors is done sequentially.
This block includes offset and temperature compensation as well as amplitude
matching.
Preparation of the input signal for the ATAN calculation. Inversion and offset
adjustment functions.
Angle calculation.
A 33-point linearization of the ATAN output. In addition output settings for gain an
clamping.
An on-chip temperature sensor is available. It can be read over the SPI interface. This
sensor is also used for signal conditioning
The linearized measurement data is available over a single pin in the form of a pulse
width modulated (PWM) signal.
A bi-directional SPI interface allows communication with the chip, including reading
measurement data, E²PROM contents or writing configuration data.
The on-chip E²PROM contains the configuration data of the chip.
Monitor functions on different blocks to check the correctness of the internal signals.
ams Datasheet
[v1-06] 2015-Aug-28
AS5403A/D/E −
Pin Assignments
Pin Assignments
Figure 5:
AS5403 Pin Configuration
AS5403 Pin Configuration, TSSOP-14
Package (Top View):
X indicates the axis
of lateral position measurement; z axis is
perpendicular to the package surface
TEST
SCS
SCLK
SDI
SDO
TEST
NC
1
3
4
5
6
7
14
DSW
OUT
GND
VDD3
VDD
NC
NC
AS5403x
2
13
12
11
10
9
8
Y
X
ams Datasheet
[v1-06] 2015-Aug-28
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