IC-TW28 Datasheet, PDF (54/80 Pages) IC-Haus GmbH – 10-BIT SIN/COS INTERPOLATOR

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Rev D2, Page 54/80
TH Registers
The four TH registers are static registers containing the
error correction residue thresholds used for detection
of an excessive error status condition (STAT_VAL.res).
S_AMP
S_AMP is a dynamic register containing the current sin
channel amplitude. It is updated once per input cycle,
or less at high input speeds.
Address
0x400A
0x400D
0x4010
0x4011
Residue Threshold Registers
Name
Description
SC_OFS_TH
Sin/cos offset threshold
SC_BAL_TH
Sin/cos balance threshold
SC_PH_TH
Sin/cos phase threshold
Z_PH_TH
Z phase threshold
Value
0 – 255
S_AMP (0x4021)
Description
Min. – max. sin channel amplitude
Table 115: Sin Amplitude
Table 112: Residue Threshold Registers
Residue threshold register values are positive integers.
See Excessive Error Detection on page 62 for more
information.
WATCHDOG
The WATCHDOG register is a dynamic register con-
tinuously updated by the iC-TW28 while it is operating
correctly.
Value
0 – 30
31
32 – 255
WATCHDOG (0x401C)
Description
iC-TW28 not OK
iC-TW28 OK
iC-TW28 not OK
Table 113: Watchdog
C_AMP
C_AMP is a dynamic register containing the current cos
channel amplitude. It is updated once per input cycle,
or less at high input speeds.
Value
0 – 255
C_AMP (0x4022)
Description
Min. – max. cos channel amplitude
Table 116: Cos Amplitude
DEVICE_ID
DEVICE_ID is a read-only register containing the
iC-TW28 device (chip) ID for identification purposes.
Value
0x0C
DEVICE_ID (0xE000)
Description
iC-TW28 Device ID
Clear the watchdog register by writing 0 to it. After a
minimum wait time of 1 ms, it should read 31 (0x1F)
if the iC-TW28 is operating correctly. Any other value
indicates a serious internal malfunction.
SC_AMP
SC_AMP is a dynamic register c_√ontaining the current
sin/cos sensor input amplitude sin² + cos². It is up-
dated every 500 µs.
Table 117: iC-TW28 Device ID
REV0 and REV1
REV0 and REV1 are read-only registers which together
contain the iC-TW28 device (chip) revision level.
REV1
0x11
0x11
REV0 (0xE002) and REV1 (0xE003)
REV0
Description
0x14
iC-TW28 X
0x15
iC-TW28 W and W1
Value
0 – 255
SC_AMP (0x4020)
Description
Minimum – maximum sin/cos amplitude
Table 118: iC-TW28 revision
Table 114: Sin/Cos Amplitude