Inductive High Speed Angle Position Sensing
for Automotive Applications
Inductive
High Speed
Motor Control
ams.com/AS5715R
- High speed measurement up to 480,000 rpm
- Flexible system configuration and application form factors
- Easy adaption to any application – all pole-pair counts with constant resolution
- Robustness against magnetic stray fields
ams.com
sensors@ams.com
© 03/2020 by ams
Subject to change without notice
Headquarters
ams AG
Tobelbader Strasse 30, 8141 Premstaetten, Austria
Phone +43 3136 500-0
Sales Oces Worldwide
sales-europe@ams.com
sales-asia@ams.com
sales-americas@ams.com
General Description
The ams IC features high speed angle position sensing based on inductive sensing
technology. The device is combined with a customized coil system based on an
inductive technology. The device is combined with a customized coil system which
consists of a target, TX (transmitting) and two RX (receiving) coils integrated on a
PCB. The device excites the TX coil with a high frequency voltage. The target above
the coils eects the voltage, induced into the RX coils depending on the position of
the target. The device measures, demodulates, and amplies this voltage.
The output is a SIN and COS shaped voltage which is proportional to the position
of the target. By applying an atan2 (2-argument arctangent) calculation to the
output signals with SIN and COS as arguments, an accurate angle is calculated.
The product is dened as SEooC (Safety Element out of Context) according
ISO26262.
Features
Typical Application
Benets
Block Diagram Package
- On and o axis applications
- Adaptable coil system layout
- Typical accuracy with 4 pole-pair conguration:
<0.075 deg mechanical, <0.3 deg electrical
- Suitable for high speed applications
- Dierential SIN and COS output
- Functional safety diagnostics
- Suitable for automotive applications
- BLDC motor control
- Traction motors
- Electronic power steering
- Mirror LIDAR
- Replacement of Resolvers
- Flexible PCB design possible, enabling hollow shaft and side shaft applications
- Adaptable to the pole pair count of the motor
- Low torque ripple and motor noise and increased eciency
- 3.3 to 5.8 µs propagation delay dependent on lter setting
- Easy replacement of existing AMR/GMR sensors
- ASIL C(D) as SEooC
- AEC-Q100 Grade 0 qualied up to -40 to 160 °C
TSSOP-14
Demod
Demod
LC
Oscillator
Supply-
Power Manageme nt
Amplitude
detector
AGC
AGC
I2
Digital Logic
AS5715R
SIN+/SDA
SIN-
COS+/SCL
COS-
TGND
VDD3V3
220nF
GND
VCC
100nF
+5V
TXA
TXB
RXSA
RXSB
RXCA
RXCB
RX1
RX2
TX
V
LDO
(+3.3V)
f
OSC
HV Output
+
HV Output
+
Target
Coils
Senso r