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R01AN0168ED0101 Rev. 01.01 40

Application Note

Chapter 7 Performing Zero Point Detection

Figure 7-4 Using the Blanking Time

(4) 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):

Figure 7-5 Using the Timing of the ZPD Table

Reference

Level:

450 mV

Detect this

with the

Digital Filter

Blanking Time:

800 µs

Measurement Time: 14 ms

Reference

Level:

450 mV

Detect this

with the

Digital Filter

Measurement

Delay: 4 ms

(2 CM Cycles)

Measurement Time: 10 ms

(5 CM Cycles @ 500 Hz)