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FXLS93421 Datasheet(PDF) 106 Page - NXP Semiconductors

Part # FXLS93421
Description  Dual channel inertial sensor
PDF  254 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

FXLS93421 Datasheet(HTML) 106 Page - NXP Semiconductors

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NXP Semiconductors
FXLS9xxxx
Dual channel inertial sensor
11.4 Voltage regulators
The device derives its internal supply voltage from the VCC/BUS_I and VSS pins. The
internal regulators are supplied by a buffer regulator (VBUF) to provide immunity from
EMC and supply dropouts on BUS_I. An external filter capacitor is required for VBUF, as
shown in Section 6.
The voltage regulator module includes voltage monitoring circuitry which holds the
device in reset following power-on until the internal voltages have increased above the
under-voltage detection thresholds. The voltage monitor asserts internal reset when the
external supply or internally regulated voltages fall below the under-voltage detection
thresholds. A reference generator provides a reference voltage for the ΣΔ converter.
aaa-030605
VOLTAGE
REGULATOR
VREF
VBUF
VBUF
VREGA
VREF_MOD
VREGA
VREF
BUS_I
BANDGAP
REFERENCE
REFERENCE
GENERATOR
Σ
CONVERTER
OTP
ARRAY
DIGITAL
LOGIC
BIAS
GENERATOR
VOLTAGE
REGULATOR
TRIM
TRIM
TRIM
OSCILLATOR
VREF
BUS_I
VREG
VBUF
VOLTAGE
REGULATOR
DSP
BUSI_UV_ERR
COMPARATOR
VBUF
VBUF_UV_ERR
POR
COMPARATOR
VREG
COMPARATOR
VREGA
VREF
COMPARATOR
C2V
Figure 11. Voltage regulation and monitoring
11.4.1 VBUF regulator capacitor and capacitor monitor
In DSI3 and PSI5 modes, the buffer regulator requires an external capacitor between the
VBUF pin and the VSS pin. Section 6 shows the recommended types and values for each
FXLS9xxxx
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2021. All rights reserved.
Product data sheet
Rev. 6 — 8 February 2021
106 / 254



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