IC-PVL Datasheet, PDF (2/33 Pages) IC-Haus GmbH – LINEAR/OFF-AXIS BATTERY-BUFFERED HALL MULTITURN ENCODER

iC-PVL LINEAR/OFF-AXIS
preliminary
BATTERY-BUFFERED HALL MULTITURN ENCODER
Rev B3, Page 2/33
DESCRIPTION
iC-PVL is an ultra low power magnetic encoder, used
for linear and off-axis multiturn position sensing. On
main power failure, iC-PVL switches automatically to
battery supply and continues scanning the position.
iC-PVL operates with pole wheels or linear scales
with a pole width of 1.0 mm up to 5.0 mm. Due to vari-
ous operating modes, iC-PVL can work with iC-Haus
singleturn encoders (e.g. iC-MU, iC-MN, iC-LGC,
iC-LNB, iC-MHM, etc.), as stand-alone SSI or incre-
mental encoder, or links to embedded controllers via
I²C.
The Hall signal processing stage is designed for ul-
tra low power applications and can be configured to
support angular accelerations up to 180 000 rad/s²
with 16 magnetic periods per revolution. The max-
imum magnetic signal frequency is 8 000 Hz. This
corresponds to a rotational frequency of 30 000 rpm
for magnetic scales with 16 pole pairs. 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.
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 the 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 CRC. Ad-
ditionally, an error is generated on excessive speed
or acceleration. An integrated battery monitor is used
to signalize an empty battery as error. If an error is
detected, it is displayed at output NERR and via the
error bit in the SSI communication protocol. Addi-
tionally, a low battery voltage is indicated at output
NWRN. Optionally, this warning can be transmitted in
the serial data stream.
Besides linear position encoding, the iC-PVL is also
used for off-axis scanning of magnetic pole wheels.
In these applications, a certain number of magnetic
north-south field periods may be interpreted as one
mechanical revolution. The FlexCount^® circuitry of-
fers this functionality. By electrically emulating the
characteristics of a gear box, a transmission is freely
programmable. For instance, 1-256 magnetic periods
can be interpreted as one mechanical revolution.
iC-PVL reads its configuration from an external EEP-
ROM via an I²C interface with multimaster 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-
The iC-PVL multiturn encoder comes in a space-sav-
ing QFN16 package. This allows its integration in
existing encoder systems or the design of smaller
encoders.