AN4505 datasheet(23/43 Pages) STMICROELECTRONICS

tên linh kiện	AN4505

Giải thích chi tiết về linh kiện	This document is intended to provide usage information

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AN4505

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 10)

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 11).

Figure 10. Wait disabled

Figure 11. 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is no longer valid (ex: Rate value below threshold)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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