AAS33051
Precision Angle Sensor IC with Incremental and
Motor Commutation Outputs and On-Chip Linearization
FEATURES AND BENEFITS
DESCRIPTION
The AAS33051 is a 360° angle sensor IC that provides
contactlesshigh-resolutionangularpositioninformationbased
on magnetic circular vertical Hall (CVH) technology. It has a
system-on-chip (SoC) architecture that includes: a CVH front
end, digital signal processing to calculate the angular position
information,andmultipleoutputformats:serialprotocol(SPI),
pulse-widthmodulation(PWM),andeithermotorcommutation
(UVW) or encoder outputs (A, B, I). It also includes on-chip
EEPROM technology, capable of supporting up to 100
read/write cycles, for flexible programming of calibration
parameters.TheAAS33051isidealforautomotiveapplications
requiring 0° to 360° angle measurements, such as electronic
powersteering(EPS), electronicpowerbraking(EPBorIDB),
transmission actuators, and BLDC pumps.
• Contactless 0° to 360° angle sensor IC, for angular
position, rotational speed, and direction measurement
□ Capable of sensing magnet rotational speeds targeting
12.5-bit effective resolution with 300 G field; higher
effective resolution possible at higher field strengths
□ Circular Vertical Hall (CVH) technology provides a
single channel sensor system, with air gap independence
• On-chip 32 segment linearization to improve angle accuracy
□ Reduces impact of magnet to sensor misalignment
□ Reduces impact of imperfect magnetization of target
magnet
• Developed as a Safety Element out of Context (SEooC)
in accordance with ISO 26262:2011 requirements for
hardware product development for use in safety-critical
applications (pending assessment)
TheAAS33051includeson-chip32segmentlinearization.This
canbeusedtocalibrateouterrorsduetomisalignmentbetween
the magnet and the sensor or imperfect magnetization of the
target magnet (which can present itself as a misalignment of
the magnet to the sensor).
□ Single die version designed to meet ASIL B
requirements when integrated and used in conjunction
with the appropriate system-level control, in the
manner prescribed in the AAS33051 Safety Manual
□ Dual die version designed to meet ASIL D
The AAS33051 supports customer integration into safety-
critical applications.
requirements when integrated and used in conjunction
with the appropriate system-level control, in the
manner prescribed in the AAS33051 Safety Manual
The AAS33051 is available in a dual-die 24-pin eTSSOP and
a single-die 14-pin TSSOP package. The packages are lead
(Pb) free with 100% matte-tin leadframe plating. The 1 mm
thin package reduces the minimum air gap between the CVH
transducer and the target magnet. The AAS33051 device is
pin-compatible with the A1339 to enable easy migration.
Continued on next page...
PACKAGES
24-pin eTSSOP (Suffix LP)
14-pin TSSOP (Suffix LE)
Not to scale
Die 1 (bottom die)
BYP_1
VCC_1
Charge
Pump
EEPROM
with CRC
Self Test
Regulator
To all internal circuits
S
Circuit Trimmings
References
and Customer Settings
GND_1
PWM_1
PWM
Band
Pass
CVH
ADC
N
Linearization,
Offset, and
Direction Invert
A_1/U_1
B_1/V_1
I_1/W_1
ABI/UVW
PLL Angle
Detect
Averaging
Filter
eTSSOP-24
Magnet oriented
for 0° output
Comparison
Used in normal operation
Turns
CS_1
ZCD Angle
Detect
Used in low power
Counter
S
SPI Interface
with CRC
MISO_1
MOSI_1
SCLK_1
Field
Strength
Temp
Sensor
ADC
N
eTSSOP-14
xxx_2
Die 2 (top die, LP-24 only)
Thermal Pad (LP-24 only)
Figure 1: AAS33051 Magnetic Circuit and IC Diagram
AAS33051-DS, Rev. 2
MCO-0000409
August 29, 2018