NXP Semiconductors FXLN8372QR1

Overview

FXLN8372QR1 from NXP Semiconductors (formerly Freescale) is a 3-axis analog-output accelerometer with ±4 g / ±16 g full-scale range selection, high-bandwidth output (2.7 kHz XY / 600 Hz Z), and ultra-low active current of 180 µA. It delivers factory-calibrated analog voltage outputs (XOUT/YOUT/ZOUT) referenced to a fixed 0.75 V zero-g offset, and operates across –40 °C to +105 °C in white goods tilt sensing and industrial vibration monitoring.

For engineers reviewing the FXLN8372QR1 datasheet, FXLN8372QR1 pinout, FXLN8372QR1 application, or FXLN8372QR1 equivalent, this page provides verified technical context, pin-level circuit roles, bandwidth-configurable analog interface behavior, shock-survivable QFN-12 packaging, and validated alternative options for motion-sensing designs requiring stable low-power analog acceleration data.

Technical Context

The FXLN8372QR1 integrates a MEMS sensing element with a CMOS ASIC that performs on-chip signal conditioning, zero-g offset compensation, and buffered analog output drive. Its g-Select pin configures full-scale range between ±4 g and ±16 g, while external capacitors on XOUT/YOUT/ZOUT set axis-specific bandwidth-8.2 nF on ZOUT and 3.3 nF on XOUT/YOUT enable the high-bandwidth mode.

Power management is implemented via EN pin control: logic high enables full operation with 660 µs turn-on time; logic low places the device into 30 nA shutdown mode. The BYP pin supplies a regulated 1.5 V internal reference (±0.05 V) and requires a 100 nF capacitor for stability, decoupling the analog output stage from supply noise.

Key Specifications

Pinout & Package

FXLN8372QR1 uses a 3 mm × 3 mm × 1 mm, 12-pin QFN package (Case 2300-01, 0.65 mm pitch) with exposed thermal pad (EP) not to be soldered. Pin 1 is marked by dot; top-side marking includes "P3XX" and lot/date codes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog-output accelerometer applications.

Compared with MMA8452QT and ADXL326BCPZ, FXLN8372QR1 uniquely combines analog output stability, selectable full-scale range, and sub-µA shutdown - making it optimal for battery-powered, field-deployable motion sensors where analog interface simplicity and adaptive dynamic range are design-critical.

Availability

FXLN8372QR1 is available at Aetrix Electronics and suitable for white goods tilt sensing, industrial robot joint monitoring, tamper detection, and medical activity tracking requiring stable component supply, long-term lifecycle support, and RoHS-compliant QFN packaging.

Supply support for FXLN8372QR1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications. Formerly Freescale Semiconductor, it acquired the Xtrinsic sensor portfolio in 2015.

The FXLN83xxQ family was designed specifically for low-power, high-reliability analog acceleration sensing in harsh environments - targeting appliance, robotics, and industrial equipment where supply variation, temperature drift, and mechanical shock tolerance are critical.

FAQ

What is the zero-g output voltage of FXLN8372QR1, and does it vary with supply voltage?

The FXLN8372QR1 has a fixed zero-g output voltage of 0.75 V on all three axes (XOUT/YOUT/ZOUT), and this value is explicitly specified as independent of VDD supply voltage. This eliminates ratiometric error in ADC measurements and simplifies system calibration across varying battery or rail conditions. The FXLN8372QR1 achieves this through internal voltage regulation and trimming, confirmed in Table 4 (Zero-g level offset) and Section 1.2 of the datasheet.

How does the g-Select pin configure the full-scale range on FXLN8372QR1?

On FXLN8372QR1, the g-Select pin selects between ±4 g (logic high) and ±16 g (logic low) full-scale ranges. This changes the analog sensitivity from 114.5 mV/g to 28.62 mV/g, respectively, as documented in Table 4 (Mechanical characteristics). The transition delay is 340 µs, and the configuration is effective immediately upon stable logic level - no register writes or timing sequences are required. This behavior is exclusive to FXLN83x2Q variants like FXLN8372QR1.

What external components are required for stable operation of FXLN8372QR1?

FXLN8372QR1 requires three mandatory external components: a 100 nF capacitor on BYP to ground for internal regulator stability; 3.3 nF capacitors on XOUT and YOUT; and an 8.2 nF capacitor on ZOUT to achieve its specified high-bandwidth mode (2.7 kHz XY / 600 Hz Z). Decoupling capacitors (0.1 µF on VDD, 4.7 µF on BYP) are also recommended per Figure 3. No pull-up/down resistors are needed on EN, ST, or g-Select pins.

Can FXLN8372QR1 operate in shutdown mode, and what is its current draw?

Yes, FXLN8372QR1 enters ultra-low-power shutdown mode when the EN pin is driven logic low. In this state, supply current drops to 30 nA typical - verified in Table 5 (Electrical characteristics). The device retains no internal state and requires a 660 µs turn-on time after EN is raised to logic high before outputs reach 90% of final value. This makes FXLN8372QR1 suitable for duty-cycled sensing in energy-constrained applications.

Is FXLN8372QR1 pin-compatible with other members of the FXLN83xxQ family?

Yes, FXLN8372QR1 shares identical pinout, package (QFN-12, 3×3×1 mm), and footprint with all FXLN83xxQ variants including FXLN8361QR1, FXLN8362QR1, and FXLN8371QR1. All share the same BYP/VDD/ST/EN/g-Select/GND/XOUT/YOUT/ZOUT/NC pin assignments and mechanical mounting requirements. However, bandwidth and full-scale range configurations differ by part number and are factory-set or pin-selected - electrical compatibility requires verifying range and bandwidth requirements match the target variant.