NBP9 datasheet(21/65 Pages) NXP

21 / 65 page

NXP Semiconductors

NBP9

Battery pressure monitor sensor

aaa-037669

Start

Is Pcurrent > Pprevious + Min_T?

Take new pressure measurement

Pcurrent and store it in the Pressure

FIFO. Read Pprevious from the FIFO.

Yes

Is Incr_cnt > 0?

Thresholds configured by the user

Internal variables

Is Deb_RT_cnt == 0?

Yes

Is Deb_RT_cnt > Debounce_T?

End

Incr_cnt - -

(minimum value is 0, cannot

become negative)

Deb_RT_cnt - -

(minimum value is 0, cannot

become negative)

Reset all variables and raise RTF

flag

Incr_cnt ++

Yes

Deb_RT_cnt ++

Set PrefRT = Pcurrent

Yes

Is Pcurrent > PrefRT

AND Pcurrent - PrefRT

> Prel_T?

Yes

Figure 11. Relative threshold algorithm flow

The variables and thresholds used in the flow are described below:

• Pcurrent: variable internal to the NBP9 program that holds the latest pressure measurement.

• Pprevious: variable internal to the NBP9 program that holds the previous pressure measurement.

• PrefRT: variable internal to the NBP9 program that stores the last pressure value before the pressure started

to rise.

NBP9

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3.2 — 3 November 2023

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