IC-TW8_16 Datasheet, PDF (14/67 Pages) IC-Haus GmbH – 16-BIT SIN/COS INTERPOLATOR

iC-TW8 16-BIT SIN/COS INTERPOLATOR
WITH AUTO-CALIBRATION
ADDITIONAL INFORMATION
Rev C2, Page 14/67
Documentation
• Pin Configuration Manual: refer to attachment PC
• Serial Configuration Manual: refer to attachment SC
• Programmer’s Reference: available on request, please contact iC-Haus applications engineering.
• Evaluation Board Description iC-TW8 EVAL TW8_1D: refer to iC-Haus website for download.
• GUI Software: refer to iC-Haus website for download.
Design Tools
• Rotary Encoder Design Tool (Excel spreadsheet):
available on request, please contact iC-Haus applications engineering.
Application Notes
• (under preparation)
DESIGN REVIEW: Function Notes
iC-TW8 C1
No.
1
Function, Parameter/Code
Look-up Table:
ADPT_CFG.lut
Description and Application Notes
The distortion look-up table is not featured by chip release C1;
mandatory programming: ADPT_CFG.lut = 0
Table 7: Notes on chip functions regarding iC-TW8 chip release C1.
iC-TW8 D1, D2, D3
No.
Function, Parameter/Code
1
Adaption Quality Monitoring:
MON_CFG.adapt
2
ADC Underflow:
STAT_SP.adcuf
3
ADC Fault Enable:
FLT_EN.adc
4
32-bit Position Counter Reset:
MAIN_Z.reset
Description and Application Notes
If enabling adaption quality monitoring, note that this reduces the permissible
adaption limits and quality thresholds for MON_OFF, MON_GAIN, and
MON_PHASE (allowed maximum value is 7 instead of 12).
Refer to the Programmer’s Reference for further details.
This status error is initially raised on startup because the signal amplitude (first
ADC_AMP value) has not been calculated yet.
Do not enable latching (freezes ADC underflow status raised on startup).
If latching ADC overflow and underflow conditions is essential to the system, use
an external MCU to set the FLT_EN.adc after startup has been completed.
To reset the 32-bit position counter by an index signal, use MAIN_Z.reset = 1 to
reset whenever the Z output is active.
Do not use MAIN_Z.reset = 2 to reset by the ZERO input signal (as described in
previous datasheet releases), as this may cause invalid data for SPI output and
spurious AB output bursts.
Table 8: Notes on chip functions regarding iC-TW8 chip releases D1, D2, D3
iC-TW8 D4
No.
Function, Parameter/Code
Description and Application Notes
None at time of printing (related to this datasheet release).
Table 9: Notes on chip functions regarding iC-TW8 chip release D4.