iC-TW2
8-BIT SIN/COS INTERPOLATION IC
WITH INTEGRATED EEPROM
Rev D3, Page 2/30
DESCRIPTION
iC-TW2’s interpolation engine accepts two fully differ-
ential sensor bridges delivering sinusoidal input sig-
nals (SIN/COS) to produce a highly interpolated out-
put signal. No further external components are re-
quired. Single ended sensor signals are supported
by tying the negative input terminal to a signal refer-
ence, usually VDD/2.
iC-TW2 generates one index pulse for every input
period. The position in respect to the start of the
period as well as the width of the pulse is fully pro-
grammable. Index pulse position can be used in con-
junction with the startup mode to guarantee a desired
phase relationship between A, B and index output
pulse.
There are four different output modes provided, in-
cluding 3-phase commutation output for brushless
DC motors. It is highly programmable to meet re-
quirements for a wide range of applications. Two se-
rial interfaces have been included to permit configu-
ration of the device, also accessing an internal EEP-
ROM. Both interfaces allow complete configuration
of the device including transfer of setup and system
data to register and EEPROM for non-volatile config-
uration.
For an illustration of the interpolation function of the
iC-TW2 see Figure 2 on page 10.
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ICHAUS [ IC-HAUS GMBH ]
