FXLS93421 datasheet(12/254 Pages) NXP

12 / 254 page

NXP Semiconductors

FXLS9xxxx

Dual channel inertial sensor

9.3 Pinning: DSI3 or PSI5 mode

BUSSW_L

BUS_O

TEST5

TEST1

TEST_MOSI

TEST4

TEST_MISO

TEST_SCLK

15 14 13

Transparent topview

FXLS9xxxx

terminal 1

index area

aaa-030598

Figure 10. Device pinout: DSI3 or PSI5 mode pinout

9.4 Pin description: DSI3 or PSI5 mode

Pin Name

Definition

Description

BUS_O

Supply Out

This pin is connected to the IDATA pin through an internal sense resistor

and provides the supply connection to the next slave in a daisy chain

configuration.

In DSI3 mode, an external capacitor must be connected between this pin and

VSS as shown in Figure 2.

In PSI5 mode, NXP recommends that this pin be unterminated. Optionally,

this pin can be connected to IDATA.

2, 4, 6, 12 TEST

Test Pin

NXP recommends that these pins be unterminated. Optionally, this pin can be

tied to VSS.

3, 5

BUSSW_L

Low Side Bus

Switch Driver

In PSI5 daisy chain mode, these pins are connected to the gate of an N-

channel FET which connects BUSRTN to the next slave in the daisy chain.

An external pulldown resistor is required on the gate of the N-channel FET

as shown in Figure 4. Note: both pins provide the identical function. It is

necessary to connect only one pin is to the bus switch gate.

If unused, or in DSI3 mode, NXP recommends that this pin be unterminated.

Optionally, this pin can be tied to VSS.

7, 14

BUSRTN/VSS Supply Return This pin is the supply return node.

TEST_SS_B Slave select

NXP recommends that this pin be unterminated. Optionally, this pin can be

connected to VBUF.

TEST_SCLK SPI Clock

NXP recommends that this pin be unterminated. Optionally, this pin can be

connected to VSS.

TEST_MOSI SPI Data In

NXP recommends that this pin be unterminated. Optionally, this pin can be

connected to VSS.

TEST_MISO SPI Data Out

This pin must be left unconnected.

Table 10. Device pinout: DSI3 or PSI5 mode pinout

FXLS9xxxx

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

Product data sheet

Rev. 6 — 8 February 2021

12 / 254

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