IC-TW28 Datasheet, PDF (59/80 Pages) IC-Haus GmbH – 10-BIT SIN/COS INTERPOLATOR

Z Capture Event
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Rev D2, Page 59/80
STATUS AND FAULT LOGIC
The status and fault logic for a single condition is shown
schematically in Figure 33.
STAT_VAL.x
STAT_LATCH.x
STAT_SEL.x
STAT_IE.x
irq (SPI Status Byte)
xIRQ
ABZ Output Disable (Hi-Z)
STAT_HIZ.x
Figure 33: Single Condition Status and Fault Logic
The iC-TW28 continuously monitors 8 internal condi-
tions and reports these status values in the STAT_VAL
register. Before activating a bit in the STAT_VAL
register, however, the specific condition must have
been continuously active for the time specified by
STAT_CFG.filter. This filtering avoids nuisance trip-
ping of the status bits. See STAT_VAL on page 47 for
more information on the individual status conditions.
The eight status values are also latched into the
STAT_LATCH register where they remain active even
if the specific condition is no longer active. The host
processor or microcontroller can read and then individ-
ually clear these latched status bits by writing to the
STAT_LATCH register.
The STAT_IE register enables the selected status con-
ditions to actually activate the interrupt request output,
xIRQ. The internal interrupt request is also available
as part of the SPI status byte in the SPI command
response packet. See Response Packet Formats on
page 32 for more information.
Finally, the STAT_HIZ register provides an indepen-
dent selection of which of the selected status condi-
tions disable the ABZ outputs by putting them in a high
impedance state. Thus each status condition can be
individually configured to interrupt the host processor
or disable the ABZ outputs, do neither, or do both.
Status conditions can also be individually configured to
indicate a fault and/or interrupt the host processor or
microcontroller when activated. The STAT_SEL register
selects whether the dynamic bits in the STAT_VAL reg-
ister or the latched bits in the STAT_LATCH register are
used to generate an interrupt request. In general, select
the STAT_VAL register in stand-alone applications (to
avoid latching up the fault LED) and STAT_LATCH in
hosted applications where the iC-TW28 status is polled
(to avoid missing an event).