AN4504 datasheet(21/41 Pages) STMICROELECTRONICS

No de pièce	AN4504

Description	This document is intended to provide usage information

PDF	41 Pages

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Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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AN4504

Interrupt generation

The WAIT bit of the INT1_DURATION register has the following meaning:

Wait = ‘0’: the interrupt falls immediately if the signal crosses the selected threshold

(Figure 7)

Wait = ‘1’: if the signal crosses the selected threshold, the interrupt falls only after the

duration has counted the number of samples at the selected data rate, written into the

duration counter register (Figure 8).

Figure 7. Wait disabled

Figure 8. Wait enabled

• Wait bit = ‘0’

Interrupt disabled as soon as condition

is no longer valid (ex: Rate value below threshold)

Rate

(dps)

Rate

Threshold

t(n)

Interrupt

Counter

Duration

Value

“Wait”

Disabled

• Wait bit = ‘1’

Interrupt disabled after duration

sample (sort of hysteresis)

Rate

(dps)

Rate

Threshold

t(n)

Interrupt

Counter

Duration

Value

“Wait”

Enabled

Duration value is the same used to validate interrupt

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