IC-PV Datasheet, PDF (2/28 Pages) IC-Haus GmbH – BATTERY-BUFFERED HALL MULTITURN ENCODER

iC-PV
BATTERY-BUFFERED HALL MULTITURN ENCODER
Rev E2, Page 2/28
DESCRIPTION
iC-PV is an ultra low power magnetic multiturn en-
coder with up to 40 bit multiturn and 3 bit singleturn
resolution, used for magnetic on-axis position sens-
ing. On main power failure, the iC-PV switches to
battery supply automatically and continues counting
the correct multiturn position.
Together with an additional singleturn encoder iC (e.g.
iC-MHM, iC-LG, iC-LNB, etc.) and a diametrically
magnetized cylindrical permanent magnet it forms a
complete multiturn encoder system. Depending on
the used singleturn iC, a second magnetic or optical
code disc might be mandatory. Furthermore the iC
can function as a 3 bit parallel encoder. A multiturn
encoder system can be built in combination with a
microcontroller and an optional singleturn device.
The Hall signal processing stage is designed for ul-
tra low power applications and can be configured to
support angular accelerations up to 760 000 rad/s²
at a maximum speed of 120 000 rpm. With higher
demands on acceleration, the power consumption
increases. The maximum supported acceleration is
configurable, therefore an optimal trade-off between
power consumption and supported acceleration can
be individually chosen to meet the demands of the
target application.
iC-PV reads its configuration from an external EEP-
ROM via an I²C interface with multi-master support.
Among others, the bit length for multiturn and syn-
chronization data, the interface mode, the maximum
supported acceleration and the usage of error or par-
ity bits can be configured. The configuration read-in
is triggered by the preset pin PRE. A pulse on this
pin resets the device and reads a new configuration
from EEPROM. The multiturn counter is preset to a
configurable value (default 0).
The configuration RAM and multiturn counter value
are protected against bit errors by an 8 bit polyno-
mial cyclic redundancy check. Additionally, an error
is produced on excessive speed or acceleration. An
integrated battery monitor can be used to signalize
an empty battery as an error. A detected error is dis-
played via output NERR and is observable as an error
bit in the SSI communication protocol.
While providing this wide range of functionality, the
iC-PV multiturn encoder comes in a space-saving
QFN16 package. This facilitates its integration in ex-
isting encoder systems or the design of new small
encoders.