TMG49037 datasheet(60/79 Pages) OSRAM

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Page 59

[v1-01] 2019-Aug-20

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TMG49037 − Register Description

Calibration Configuration Register Three

(CALIBCFG3 0xDB)

Figure 66:

Calibration Configuration Register Three

6543

210

Reserved

ZERO_WEIGHT

Field

Bits

Description

ZERO_WEIGHT

3:0

Zero Detection Weighting Filter. Sets the frequency of detection of

zeroes necessary to raise the ZERO_DETECTED flag. ZERO_WEIGHT should

only be used if DCAVG_AUTO_OFFSET_ADJUST and

PROX_AUTO_OFFSET_ADJUST are NOT used, in other words, when offset

adjustments are handled only by software. If the automatic on-chip

adjustments are made, ZERO_WEIGHT has no purpose. ZERO_DETECTED

is raised when an internal counter reaches a value of 15. During normal

proximity/gesture operation, if any of the ADC values on the four channels

is zero, the counter increments by ZERO_WEIGHT. Every time there are no

zeroes, it decrements by 1. At each weight, there is an equilibrium

frequency that will rarely raise the ZERO_DETECTED flag. For example, if

ZERO_WEIGHT is set to 3, zero detection will be at equilibrium if there are

3 non-zero cycles for every 1 zero cycle, a 25% frequency of zeroes. Even at

equilibrium, there is a chance that enough zeroes will occur in a short

period of time to raise the ZERO_DETECTED flag. For each weighting,

there is a never flag frequency below which it is exceedingly unlikely that

the flag will be raised.

VALUE

WEIGHT

EQUILIBRIUM

FREQUENCY

NEVER FLAG

FREQUENCY

Never (Ignored)

50%

35%

33%

16%

25%

20%

17%

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