IC-TW2_13 Datasheet, PDF (26/28 Pages) IC-Haus GmbH – 8-BIT SIN/COS INTERPOLATION IC

iC-TW2 8-BIT SIN/COS INTERPOLATION IC
WITH INTEGRATED EEPROM
TYPICAL APPLICATIONS
Rev E2, Page 26/28
The circuit in Figure 22 depicts a typical application.
Differential sensor signals (or differential sine/cosine
encoder signals) are directly connected to the iC-TW2.
Index gating is single ended active low as is frequently
the case when using a Hall switch. The VC signal of
1.21 V is used to bias the positive input PINZ. It is rec-
ommended to decouple pin VC with a small capacitor
when it is used as a reference. When pin VC is left
unconnected, no capacitor is required.
Although iC-TW2 features internal pull-down current
sources to define default pin levels, an additional pull-
down resistor at pin SCLK can be recommended to
reduce its disturbance and cross talk sensitivity.
When using pins NRST (low active reset input) and 1W
(programming) is not intended, R1 and R2 can be re-
placed by shorts to VDD.
Index
Sensor
Digital Hall,
active low
Sensor
Bridge A
R1
10kΩ
Sensor
Bridge B
+5V
D1
5.6V
SCLK
SDAT
GND
VC(19)
C3
100nF
NINZ(20)
PINZ(21)
R4
1kΩ
R3
10kΩ
SCLK(22)
CLKEXT(23)
SDAT(24)
+5V
iC-TW2
C1
1μF
N.C.(12)
GNDA(11)
C2
VDDA(10)
1μF
R2
1W(9) 10kΩ
Z_W (8)
NZ_NW (7)
0V
PZ
Gated index
output
NZ
NA
PA _Differential
NB ^{A/B output}
PB
TVS-Diode-Array
Figure 22: Application circuit with differential sin/cos sensor bridges and a Hall switch for index sensing.