IC-TW2 Datasheet, PDF (2/30 Pages) IC-Haus GmbH – 8-BIT SIN/COS INTERPOLATION IC WITH INTEGRATED EEPROM

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.
CONTENTS
PACKAGES
ABSOLUTE MAXIMUM RATINGS
3 CONFIGURATION DEPENDENCIES
19
Selecting configuration parameters . . . . . . 19
4
Clock tuning . . . . . . . . . . . . . . . . . . . 19
THERMAL DATA
ELECTRICAL CHARACTERISTICS
REGISTER MAP
PROGRAMMING
4
DEVICE IDENTIFICATION
20
5
START UP
21
8
Power-On-Reset . . . . . . . . . . . . . . . . 21
Reset . . . . . . . . . . . . . . . . . . . . . . 21
9
DESCRIPTION OF INTERPOLATION
10 ^{1W- / 2W-INTERFACE AND EEPROM ACCESS 22}
Interpolation vs. Resolution . . . . . . . . . . 10
Memory map . . . . . . . . . . . . . . . . . . 22
2W-Interface . . . . . . . . . . . . . . . . . . 22
INPUT STAGE
11
2W-Interface timing . . . . . . . . . . . . . . . 24
OUTPUT MODES
12
AB Quadrature And Up/Down and Incr/Dir
Modes . . . . . . . . . . . . . . . . . . . 13
1W-Interface . . . . . . . . . . . . . . . . . . 26
1W-Interface write sequence . . . . . . . . . 26
Writing the register bank to the EEPROM . . 26
3 Phase Commutation Mode . . . . . . . . . 14
TEST MODES
27
INDEX GATING
15
Production test control bits . . . . . . . . . . 27
CALIBRATION
17 _{TYPICAL APPLICATIONS}
28
A/B gain and offset calibration . . . . . . . . . 17
Oscillator and index window calibration . . . 17 PCB LAYOUT GUIDELINES
29