A1335
Precision Hall-Effect Angle Sensor IC
with ꢀ2C, SPI, and SENT Interfaces
FEATURES AND BENEFITS
DESCRIPTION
• 360° contactless high-resolution angle position sensor
• CVH (Circular Vertical Hall) technology
• Available with either a single die or dual independent die
housed within a single package
TheA1335isa360°contactlesshigh-resolutionprogrammable
magnetic angle position sensor IC. It is designed for digital
systems and is capable of communicating via an I2C, SPI, or
SENT interface.
• Digital output format selectable among SPI, I2C, and
SENT (Single-Edge Nibble Transmission)
• SENT output is SAEJ2716 JAN2010 compliant, with
Allegro proprietary enhanced programmable features
• Customer-programmable SENT tick times, ranging
from 0.5 to 7.9 µs
• SPI interface allows use of multiple independent sensor
ICs for applications requiring redundancy
• Refresh rate: 32 µs, 12-bit resolution
• Wide range of diagnostics enable automotive applications
to achieve ASIL-D compliance
• Programmable via Manchester encoding on the VCC
line, reducing external wiring
This system-on-chip (SoC) architecture includes a front
end based on Circular Vertical Hall (CVH) technology,
programmable microprocessor-based signal processing, and
featuresaninterfacecapableofsupportingI2C,SPI,andSENT.
Besides providing full-turn angular measurement, the A1335
also provides scaling for angle measurement applications less
than360°.Itincludeson-chipEEPROMtechnology,capableof
supportingupto100read/writecycles,forflexibleprogramming
of calibration parameters.
Digital signal processing functions, including temperature
compensation and gain/offset trim, as well as advanced output
linearization algorithms, provide an extremely accurate and
linear output for both end-of-shaft applications as well as
off-axis applications.
• Automotive temperature range: –40°C to 150°C
• AEC-Q100 automotive qualified
• Two types of linearization algorithms offered: harmonic
linearization and segmented linearization
TheA1335isidealforautomotiveapplicationsrequiringhigh-
speed 360° angle measurements, such as: electronic power
steering (EPS), transmission, torsion bar, and other systems
that require accurate measurement of angles. The A1335
linearizationschemesweredesignedwithchallengingoff-axis
applications in mind.
□ Enables off-axis operation
Continued on the next page…
Packages:
The A1335 is available as a single die in a 14-pin TSSOP, or
dual die in a 24-pin TSSOP. Both packages are lead (Pb) free
with 100% matte-tin leadframe plating.
Not to scale
Single SoC, 14-pin TSSOP
(suffix LE)
Dual Independent SoCs, 24-pin
TSSOP (suffix LE)
V+
SOC Die
To all internal circuits
Regulator
Analog Front End
VCC (also
programming)
BYP
Multisegment
CVH Element
SENT
SENT
Interface
Digital
Subsystem
C
BYP(VCC)
Diagnostics
SDA/MISO
SCL/SCLK
SA0/CS
2
C
I C/SPI
BYP(BYP)
Interface
32-bit
Microprocessor
SA1/MOSI
ISEL
ADC
VCC
(Programming)
Industry-leading linearization
enables off-axis (side-shaft)
operation
EEPROM
DGND
AGND
Functional Block Diagram
A1335-DS
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