IC-TW2_13 Datasheet, PDF (2/28 Pages) IC-Haus GmbH – 8-BIT SIN/COS INTERPOLATION IC

iC-TW2 8-BIT SIN/COS INTERPOLATION IC
WITH INTEGRATED EEPROM
Rev E2, Page 2/28
DESCRIPTION
iC-TW2’s interpolation engine accepts two fully differ-
ential sensor bridges delivering sine and cosine input
signals to produce a highly interpolated output sig-
nal. No further external components are required.
Single-ended sensor signals are supported by tying
the negative input terminals to the signal reference,
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.
There are four different output modes provided, in-
cluding 3-phase commutation output for brushless
DC motors. To meet requirements for a wide range
of applications, iC-TW2 is highly programmable.
Two serial interfaces have been included to permit
configuration of the device, also accessing the inter-
nal EEPROM. Both interfaces allow complete con-
figuration of the device including transfer of setup
data to internal registers and the on-chip EEPROM
for non-volatile storage.
CONTENTS
PACKAGING INFORMATION
PIN CONFIGURATION QFN24 4 mm x 4 mm
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
3
Oscillator and index window calibration . . . 16
3
CONFIGURATION DEPENDENCIES
17
4
Selecting configuration parameters . . . . . . 17
Clock tuning . . . . . . . . . . . . . . . . . . . 17
4
Accuracy modes . . . . . . . . . . . . . . . . 17
ELECTRICAL CHARACTERISTICS
5 _{DEVICE IDENTIFICATION}
18
REGISTER MAP
8 _{START UP}
19
PROGRAMMING
9
Power-On-Reset . . . . . . . . . . . . . . . . 19
Reset . . . . . . . . . . . . . . . . . . . . . . 19
DESCRIPTION OF INTERPOLATION
10
Interpolation vs. Resolution . . . . . . . . . . 10 ^{1W- / 2W-INTERFACE AND EEPROM ACCESS 20}
Memory map . . . . . . . . . . . . . . . . . . 20
INPUT STAGE
11
2W-Interface . . . . . . . . . . . . . . . . . . 20
Programmable Gain Amplifier . . . . . . . . . 11
2W-Interface timing . . . . . . . . . . . . . . . 23
Offset Adjustment . . . . . . . . . . . . . . . 11
OUTPUT MODES
12
AB Quadrature And Up/Down and Incr/Dir
Modes . . . . . . . . . . . . . . . . . . . 13
Trouble Shooting . . . . . . . . . . . . . . . . 23
1W-Interface . . . . . . . . . . . . . . . . . . 24
1W-Interface write sequence . . . . . . . . . 24
Writing the register bank to the EEPROM . . 24
3 Phase Commutation Mode . . . . . . . . . 14 TEST MODES
25
INDEX GATING
Production test control bits . . . . . . . . . . 25
15
CALIBRATION
TYPICAL APPLICATIONS
26
16
A/B gain and offset calibration . . . . . . . . . 16 PCB LAYOUT GUIDELINES
27