FXLS8971CF datasheet(18/100 Pages) NXP

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NXP Semiconductors

FXLS8971CF

3-Axis Low-g Accelerometer

12.1.2.5 I2C data sequence diagrams

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Device Address[6:0]

Legend

Primary

Secondary

Primary

Secondary

Primary

Secondary

Primary

Secondary

Primary

ST: Start Condition

SP: Stop Condition

ACK: Acknowledge

NACK: No Acknowledge W: Write = 0

SR: Repeated Start Condition

Secondary

SR Device Address[6:0] R

NACK

ACK

DATA[7:0]

ACK

DATA[7:0]

continued

Device Address[6:0]

Device Address[6:0] R

ACK

NACK SP

Data[7:0]

ACK

Device Address[6:0]

Data[7:0]

ACK

Device Address[6:0]

Data[7:0]

ACK

Figure 8. I2C Data Sequence Diagrams

13 SPI interface

The SPI interface is a classic primary/secondary serial port. FXLS8971CF is always considered to be the

secondary device and therefore never initiates communication with the host processor.

The SPI interface of FXLS8971CF is compatible with interface mode 00, corresponding to CPOL = 0 and CPHA

= 0.

For CPOL = 0, the idle value of the clock is zero, and the active value of the clock is 1. For CPHA = 0, data is

captured on the rising edge (low to high transition) of the clock, and data is propagated on the falling edge (high

to low transition) of the clock.

13.1 General SPI operation

The SPI_CS_B pin is driven low at the start of a transaction, held low during the transfer, and then driven high

again after the transaction is completed. During a transaction, the primary toggles the clock (SCLK). The SCLK

polarity is defined as having an idle value that is low, and an active phase that is high (CPOL = 0). Serial input

and output data is captured on the rising edge of the clock and propagated on the falling edge (CPHA = 0).

Single-byte read and single-byte write operations are completed in 24 SCLK cycles; multiple-byte reads and

FXLS8971CF

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Product data sheet

Rev. 2.1 — 7 March 2024

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