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R01AN0168ED0101 Rev. 01.01 42

Application Note

Chapter 7 Performing Zero Point Detection

Note In most cases, the reference level on its own is enough to detect the ZP

clearly. Then, the digital filter can be generally disabled by setting depth and

level to 1. The digital filter is an additonal aid for detection in difficult cases.

7.2 The ZPD Function Settings

7.2.1 Analogue Hardware of ZPD

Attached to ISM, there is a quite sophisticated set of analogue hardware

beside it. This hardware is activated by the flag

GZE, powered by the flag GZP,

and linked to ISM by the flag

GZL.

Note ISM is capable to switch the direction of its ports dynamically during its

operation. This feature is essential for the ZPD measurements. Therefore, take

care that the appropriate port setting is activated, to let ISM have control on the

port direction.

Figure 7-7 ZPD Analogue Circuitry

6 Sync Stages Digital Filters

ZDR

Analogue Circuitry

ZPD Measurement

Sequencer

Reference

Voltage

Selection 1

6 Comparators

4:1

Mux

ZPD

Prescaler

6*2

SYNC

COSPFB0

COSMFB0

SINPFB0

SINMFB0

4:1

Mux

COSPFB5

COSMFB5

SINPFB5

SINMFB5

ZISn

DIGITAL

NOISE FILTER

Next Measure

ZDR current 0

ZDRn

MACRO

CLOCK

GZF

ZDR0

GCS

ZPD_ADCOUT0

Reference

Voltage

Divider

ZPD_INTREF

ADC Output Enable

GZO

GRV

Reference

Voltage Cutoff

SYNC

DIGITAL

NOISE FILTER

ZDR current 5

ZDR5

ZDR1

ZDR2

ZDR3

ZDR4

GZP

Sequence

Start

Reference

Voltage

Selection 2

Ref.

Switch

Ref.

Switch

ZRSn

SMVSS

GZE

ZTRn

6*1

GFD, GFL

ZPD_ADCOUT5