iC-PVS
LINEAR/OFF-AXIS
BATTERY-BUFFERED ABSOLUTE POSITION HALL SENSOR
Rev A2, Page 2/51
DESCRIPTION
iC-PVS is a high performance hall sensor used for
incremental or absolute position sensing. It generates
analog sine/cosine signals usable as inputs to down-
stream high resolution A/D conversion.
Additionally, an ultra low power magnetic period
counter, used for linear and off-axis absolute position
sensing is integrated. On main power shutdown,
iC-PVS automatically switches to battery supply and
continues scanning solely the absolute position. To
save power, the high resolution analog signal output
is inactive in battery mode.
iC-PVS operates with pole wheels or linear scales
with a pole width of 1.0 mm up to 2.5 mm. Ferrous
gear wheels with a gear tooth module of 0.3 up to 1.5
can be scanned with the help of a back-bias magnet.
The iC-PVS delivers the analog signal for further in-
terpolation, as well as the absolute position reference
value. In combination with suitable iC-Haus interpola-
tor devices like iC-TW29 an entire true absolute, high
resolution encoder system can be created with just
these two devices.
Coming with an integrated interpolation stage, the
iC-PVS can also be used as a stand-alone absolute
encoder with up to 6-bit electrical resolution per mag-
netic pole period.
Various interfaces for conguration and data commu-
nication are available. The serial I/O interface can
act as a sensor interface using either the BiSS C
protocol (up to 10 MHz, bidirectional), SSI protocol
(up to 4 MHz) or SPI protocol (4-pin SPI, 4 MHz).
Additionally incremental and parallel output modes
are available.
After power-on, the iC-PVS collects its CRC protected
conguration data from an external I
2
C-EEPROM
or waits for the conguration from one of the I/O
interfaces. An undervoltage reset zeroes internal reg-
isters. Furthermore, the pin PRE serves as a preset
input (high active). Additional to EEPROM readout,
the I
2
C interface can also be used for direct register
communication via the I2C protocol.
The period counter stage is designed for ultra low
power applications and can be congured to support
angular accelerations up to 80 000 rad/s
2
with 32
magnetic periods per revolution. The maximum mag-
netic signal frequency is 25 kHz. This corresponds
to a rotational frequency of 46 000 rpm for magnetic
scales with 32 pole pairs. With higher demands
on acceleration, the battery power consumption in-
creases. The maximum supported acceleration is
congurable, therefore an optimal trade-off between
power consumption and supported acceleration can
be individually chosen to meet the demands of the
individual application.
The device offered here is a multi-functional iC that contains in-
tegrated BiSS C interface components. The BiSS C process is
protected by patent DE 10310622 B4 owned by iC-Haus GmbH.
Users benet from the open BiSS C protocol with a free license
which is necessary when using the BiSS C protocol in conjunction
with this iC.
Download the license at
www.biss-interface.com/bua
General notice on application-specic programming
Parameters dened in the datasheet represent supplier’s
attentive tests and validations, but - by principle - do not imply
any warranty or guarantee as to their accuracy, completeness or
correctness under all application conditions. In particular, setup
conditions, register settings and power-up have to be thoroughly
validated by the user within his specic application environment
and requirements (system responsibility).
The performance of iC-PVS in application is impacted by
system conditions like quality of the magnetic target and its
adjustment, eld strength and stray elds, temperature and
mechanical stress and initial calibration.
