FXLS93421 datasheet(170/254 Pages) NXP

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NXP Semiconductors

FXLS9xxxx

Dual channel inertial sensor

• The capability of the master device, including, but not limited to:

– The bus operating voltage

– The bus supply current

– The bus current limit

– The bit rate

– The response current detection capability (distinguishing response current from

quiescent current)

• The total quiescent current of all slaves on the network.

• The current handling capability and resulting voltage drop of the external bus switches

in the network.

12.6.3 Resistor connected daisy chain network using discovery mode

The number of devices in a resistor connected daisy chain network is limited by the

capability of the device. The maximum number of equivalent devices connected to the

BUS_O pin of a device is 3. This is limited by the total quiescent current drawn from the

BUS_O pin during Discovery Mode (IBUS_O_q).

The practical limit is determined by a combination of the above restriction and the

following:

• The capability of the master device, including, but not limited to:

– The bus operating voltage

– The bus supply current

– The bus current limit

– The bit rate

– The response current detection capability (distinguishing response current from

quiescent current)

• The total quiescent current of all slaves on the network.

• The maximum allowed quiescent current drawn from the BUS_O pin of other slaves in

the system.

• The resulting voltage drop of the Discovery Mode resistors in all slaves in the network.

12.7 DSI3 exception handling

Table 257 summarizes the exception conditions detected by the device and the response

for each exception.

Condition

exception

PDCM

enabled?

Description

Device response

Power-On Reset

N/A

Power Applied

• See Section 12.5

• ST_INCMPLT set, PDCM disabled. The device must be

reinitialized

VBUS_I Error

N/A

VBUS_I < VBUS_I_UV_F

• Response Current Deactivated

• BUSIN_UV_ERR set, PDCM Status set as specified in

Section 12.4.2.2

• The device ignores commands in CRM

Table 257. Exception conditions and response

FXLS9xxxx

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Product data sheet

Rev. 6 — 8 February 2021

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