IC-PVL datasheet(2/33 Pages) ICHAUS

2 / 33 page

preliminary

iC-PVL LINEAR/OFF-AXIS

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.

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-

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.

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.

IC-PVL Datasheet(PDF) 2 Page - IC-Haus GmbH

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