IC-TW28 Datasheet, PDF (21/80 Pages) IC-Haus GmbH – 10-BIT SIN/COS INTERPOLATOR

outA
outB
outZ
pin OUTA
W^iCIT^-H^TA^WU²TO⁸-C1A0L-BIBITRSATINIO/CNO^VRA^ESF NINDTLEINREPODLRAIVTp^{OERrReliminpainrOyUTB}
VC
t_setup
1uF
1uF
Rev D2, Page 21/80
pin OUTZ
SIN and COS Inputs
ZERO Inputs
The iC-TW28 connects directly to magnetic (such as The iC-TW28 can interface to a wide range of differen-
iC-SM2L or iC-SM5L) and optical (such as iC-LSHB or
iC-PT...H series) sensors providing differential sin/cos
tial
aZ
oorutspinugt lwe-heicnhdeisdsiy₅n_{VndAceVhxDrDoonr izzeerdoiwC}si_-eth_Tns_Wthoer2sA₈tBo
provide
outputs.
outputs, as shown in Figure 13 and Figure 14.
Optical sensors usually provide differential zero or in-
AVDD
dex signals along w_iCith_-Pth_De sin/cos_ZEs_Rig_On₊ a_il_Cs._-I_Tn _Wma₂g₈netic
systems, a sepa_Dra_VSt_De_eDz_ne_sro_orsensor is usually required.
iC-SMxL
Sensor
PS IN
NSIN
PCOS
NCOS
iC-TW28
SI N+
MR ^Ss^INe^– nsor
pin ZE^COR^S+O+/-
COS–
Digital zero sensors (Hall, ^PM^SIR^N , and others^SI)^Nt⁺ypically pro-
vide a single-ended active_N-_Slo_INwMAsIiNgZn_EZaRl.Oov-fisai_Ssa_INns_–eot ptoenav-doridain
oCtouottnphnueet _{itcChDta-aicaTg}t_tciiWtp_{vateiulv2lHloel8saw-lZlllooEwwR(iOnop–theieNPnnCCppdOOurSSre}tsw_tartsiii_aignl_nelngdmn)e_docdrawiecin_g.nogo_tiantfo_ainnnale_CCisamnc_OOid_dtwSSae_+–teigh_dxlneoeeb_seZte_eniEcs_noRswufio_geh_Ohrlidl_s+e.
input to VC as shown in Figu^Zre 15.
ZERO+
NZ
ZERO–
Input Z threshold
MAIN_Z.ofs[4:0]
iC-TW28
t_hold
MR In
Sens
Figure 13: Magnetic Sensor Connection
5V _{gating window}
iC-PT…H
Sensor
PA
NA
PB
NB
PZ
NZ
iC-TW28
pin OUTA
SIN+
pin^SINO^– UTB
COS+
COS–
ZERO+
ZERO–
pin OUTZ
DVDD
Digital Hall
active low
VC
100
nF
ZERO+
Device internal index window.
ZERO-^{This signal can be observed on}
pin OUTA by setting
RB_TEST1.z_test to 1.
Figure 15: Digital Index Sensor Connection
For active-high (open source) digital index sensors, re-
t_{setupverse the ZER}t_{hOold+ and ZERO– connecItniodenxs.position and index width.}
MAIN_ZPOS[15:0] and
Analog-output zero sensors, such as _AM_BR_{_Z}b_Wrid_IDg_Te_Hs,_[7c_:0a_]n
also be used with the iC-TW28 as shown in Figure 16.
Figure 14: Optical Se_An_Vso_Dr_DConne_ic_Ctio_-n_TW28
Nominal differential signal amplitudes between 20 mV
and 2.0 V in two ranges can be accommZoERdOa+ted. See
Input Configuration and Signal Levels on page 55 for
more information. ^DVDD
iC-TW28
ZERO+
Single-ended sensors can be connected_ZERto_O-the SIN+
and COS+ inputs. In this case, the SIN– and COS–
inputs shouldDbigeitacloHnanllected to a resistive voltage di-
vider to bias th^ae^cm^tiveto^loth^we zero level of the sensor output
(typically half the sensor supply). Do not allow any of
the SIN or COS inputs to float.
MR Index
Sensor
ZERO-
Figure 16: Analog Index Sensor Connection
DVDD
iC-TW28
VC
To produce a Z output once every input cycle, connect
ZERO+ to 3.3 V and ZERO– to ground. This is use-
ful in on-axis applications where one input revolution
produces only one input cycle. ⁺
100
nF
ZERO+
–
If no Z output from the iC-TW28 is required, connect
ZERO+ to ground and ZERO– to 3.3 V. Do not allow
the ZERO+ or ZERO– inputs to float.
ZERO-
Digital Hall