IC-TW14 Datasheet, PDF (2/33 Pages) IC-Haus GmbH – IC-PMX Companion Chip

iC-TW14
iC-PMX Companion Chip
Rev A1, Page 2/33
DESCRIPTION
iC-TW14 is a companion chip for iC-PMX that per-
forms all the functions necessary to implement an
energy-harvesting multiturn absolute encoder using
an external singleturn sensor system such as iC-LG,
iC-MHM, iC-MU, iC-MN, etc. The iC-TW14 also pro-
vides diagnostic modes and access to iC-PMX param-
eters for the design, optimization, and calibration of a
complete system.
Without power applied, the iC-PMX uses the attached
Wiegand sensor and FRAM to count turns of the mag-
net autonomously by harvesting the energy of the
Wiegand wire pulses. At power-on, the iC-TW14 in-
terrogates the iC-PMX and determines the absolute
position of the magnet. It provides this information via
an SSI data stream to the external singleturn sensor
for start-up calibration. During powered operation, the
external singleturn sensor tracks the angular position
of the magnet and the number of turns, providing out-
put to the user’s system while the iC-TW14 monitors
the turns counting and other operational conditions of
the iC-PMX for faults.
iC-TW14 has an operating temperature range of up
to 125 °C and is suitable for measuring at high speed.
Typical applications are highly-integrated energy-har-
vesting magnetic multiturn absolute encoders. These
absolute encoders can replace existing gear or bat-
tery-buffered solutions.