AS5147P Factsheet

High-Speed,
High-Resolution
Rotary Position Sensor
www.ams.com/AS5147P
AS5147P – Safety-critical automotive applications
- DAECTM Dynamic Angle Error Compensation
- AEC-Q100 automotive qualified
- 14-bit core resolution, 12-bit binary incremental pulse count
- Immune to external stray-magnetic fields
- Highest accuracy
- Developed as Safety Element out-of-context (SEooC) according ISO26262
We provide innovative
analog solutions to
the most challenging
applications in sensor
and sensor interfaces,
power management,
and wireless.
General Description
The AS5147P is a high-resolution rotary position sensor for high-speed (up to 28krpm)
angle measurement over a full 360 degree range. This new position sensor is equipped
with a revolutionary integrated dynamic angle error compensation (DAEC™) with almost
0 latency. The robust design of the device suppresses the influence of any homogenous
external stray magnetic field. A standard 4-wire SPI serial interface allows a host microcontroller to read 14-bit absolute angle position data from the AS5147P and to program
non-volatile settings without a dedicated programmer. Incremental movements are
indicated on a set of ABI signals with a maximum resolution of 4096 steps / 1024 pulses
per revolution. The resolution of ABI signal is programmable to 4096 steps / 1024 pulses
per revolution, 2048steps / 512 pulses per revolution or 1024 steps / 256 pulses per
revolution. Brushless DC (BLDC) motors are controlled through a standard UVW commutation interface with a programmable number of pole pairs from 1 to 7. The absolute
angle position is also provided as PWM-encoded output signal. The AS5147P supports
embedded self-diagnostics including magnetic field strength too high, magnetic field
strength too low or lost magnet, and other related diagnostic features. The product is
defined as SEooC according ISO26262 including FMEDA, safety manual and third-party
qualification.
Benefits
Features
-
-
Eliminates angle measurement lag at high RPMs
Lower system costs (no shielding)
High resolution for motor and position control
Simple replacement – reduces system cost
Fast high-resolution position feedback
Provides absolute and incremental angle measurements
No programmer needed (via SPI command)
Enables ASIL-x system safety level compliance
Applications
DAEC™ Dynamic angle error compensation
Immune to external stray-magnetic fields
14-bit core resolution
Encoder output: 1024 pulses
Maximum speed up to 28.000 rpm
SPI, PWM, UVW and ABI Interfaces
Zero position, configuration programmable
Developed per ISO 26262 SEooC
DAEC™ Latency Comparison
- Safety Critical Automotive Systems
• EPS, Brakes and Airbags, for example
- Resolver replacement
- Discrete Hall commutation feedback replacement
- Servo motor position control
- BLDC/PMSM motor commutation
• Pumps, DCT, Starter, Alternator, and Wipers, for example
latency ≈ 0°
No
Compensation
External
Compensation
Integrated
DAEC™
AS5147P Block Diagram
VDD3V3
AS5147P
CSn
SCL
MISO
MOSI
Volatile Memory
SPI
VDD
OTP
LDO
ABI
Hall
Sensors
Analog
Front-End
A/D
AGC
ATAN
(CORDIC)
INTERPOLATOR
Dynamic Angle
Error
Compensation
UWV
A
B
I/PWM
U
V
W / PWM
PWM Decoder
Selectable
on I or W
GND
www.ams.com
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© 05/2015 by ams
Subject to change without notice
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