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Chapter 7
Performing Zero Point Detection
Detect this
with the
Digital Filter
Reference
Level:
450 mV
Blanking Time:
800 µs
Measurement Time: 14 ms
Figure 7-4
(4)
Using the Blanking Time
Definition of the Measurement Window using the ZPD Table
As the ZPD table itself is a timed execution list, all timing can be derived from
it, as long as the timing requirement is within the precision of the ZPD table
execution (this depends on the GUD setting).
As an example, the measurement window also can be defined like this (we are
assuming a cycle frequency of the Channel Management (GUD) of 500 Hz):
Detect this
with the
Digital Filter
Measurement
Delay: 4 ms
(2 CM Cycles)
Figure 7-5
Reference
Level:
450 mV
Measurement Time: 10 ms
(5 CM Cycles @ 500 Hz)
Using the Timing of the ZPD Table
R01AN0168ED0101 Rev. 01.01
Application Note
40