FXLS93421 datasheet(175/254 Pages) NXP

175 / 254 page

NXP Semiconductors

FXLS9xxxx

Dual channel inertial sensor

aaa-030670

GND

VCC

VSYNC

VIDLE

tSYNC

VSYNC

tRS

tS-S

Figure 85. Sync pulse characteristics

13.2.1.2 Synchronization pulse pulldown function

The device includes an optional Sync pulse pulldown function for systems in which

the master device does not include an active pull-down function. The device uses the

modulation current pulldown circuit, which sinks IR_PSI5 additional current from the BUS_I

pin. The pulldown current is activated after tPD_DLY (referenced to tTRIG), and is activated

for tPD_ON.

The Sync pulse pulldown function is disabled in Programming Mode, in Initialization

Phase 1, and in Daisy Chain Mode until the Run Command is received.

13.3 Data transmission data link layer

13.3.1 Bit encoding

The device outputs data by modulation of the VCC current using Manchester Encoding.

Data is stored in a transition occur-ring in the middle of the bit time. The signal idles at

the normal quiescent supply current. A logic low is defined as an increase in current at

the middle of a bit time. A logic high is defined as a decrease in current at the middle of a

bit time. There is always a transition in the middle of the bit time. If consecutive "1" or "0"

data are transmitted, a transition occurs at the start of a bit time.

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tBIT

consecutive

`0' data bits

IR_PSI5 current

idle current

`0'

`1'

consecutive

`1' data bits

Figure 86. Manchester data bit encoding

13.3.2 PSI5 data transmission

PSI5 data transmission frames are composed of two start bits, a 10-bit data word, and

error detection bit(s). Data words are transmitted least significant bit (LSB) first. A typical

Manchester-encoded transmission frame is illustrated in Figure 87.

FXLS9xxxx

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Product data sheet

Rev. 6 — 8 February 2021

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