NBP8 datasheet(7/58 Pages) NXP

7 / 58 page

NXP Semiconductors

NBP8

Battery pressure monitor sensor

6 Functional description

6.1 Communication between the NBP8 and external host

An example block diagram of NBP8 with an external host is shown in Figure 4:

aaa-037665

Power Supply

NBP8

Sensor

External host

PTB1 - output

PTA0 - input

output

PS ENABLE

CS_B/WAKE-UP

PTA1 - input

output

SCLK

PTA2 - output

input

SICO

PTA3 - input

output

SOCI

PTB0 - output

input

READY/INT

Figure 4. Connections between the NBP8 and external host

Description

Remarks

PS ENABLE

(PTB1)

Power supply enable.

When enabled, the NBP8 asserts the

PS ENABLE pin before generating a

pulse on the INT pin.

CS_B/WAKE UP (PTA0)

• When SPI is enabled: Client Select

active low

• When SPI is disabled: WAKE-UP /

low state triggers an interrupt on

NBP8 side (no edge required)

When SPI is disabled, the WAKE-UP

signal can be used for the external host

to request SPI communication with the

NBP8, to read memory and change

settings, or trigger a self-test, firmware

verification, software reset, or clear

flags and user FIFO.

When SPI is enabled, Client Select

when active low, ready for SCLK clock

and data

SCLK (PTA1)

SPI clock

SPI clock from external host

SICO (PTA2)

SPI SICO

Server-In-Client-Out data

SOCI (PTA3)

SPI SOCI

Server-Out-Client-In data

READY / INT (PTB0)

• READY signal: following a WAKE-

UP event, the NBP8 indicates to the

external host it is ready for the SPI

transfers by asserting the pin.

• INT signal: the NBP8 notifies the

external host that an event requiring

attention occurred by generating a

pulse on the pin.

The external host should enable a pull

up/down to maintain the pin in idle state

as long as the NBP8 does not assert it.

Note: When the NBP8 is in sleep mode, the CS_B/WAKEUP pin is configured as input with pull-up enabled. All other pins

are in high impedance state, which means that the NBP8 does not maintain their levels. Specifically, the level of the PS

ENABLE pin is not maintained by the NBP8 in sleep, so when this signal is used, its idle level must be maintained by an

external circuit.

Note: If the external host will be switched off, the CS_B/WAKE UP signal must be isolated to prevent inadvertent

assertion; a fixed low level at the NBP8 CS_B/WAKE UP input will cause the sensor to remain waiting for the SPI SCLK,

and not collect new pressure measurements.

Table 4. Connection pins description

NBP8

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

Product data sheet

Rev. 2.4 — 11 March 2022

7 / 58

NBP8 Arkusz danych(PDF) 7 Page - NXP Semiconductors

NBP8 Arkusz danych(HTML) 7 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58

Arkusz danych Pobierz

Link URL