My Inquiry
My Account
NXP Semiconductors MMA6525KW
- Part No.:
- MMA6525KW
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA6525KW.pdf
- Description:
- ACCELEROMETER 105G SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,665
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MMA6525KW from NXP Semiconductors (formerly Freescale) is a dual-axis, SPI-interface, over-damped lateral accelerometer with ±105g full-scale range per axis, 12-bit digital output, and AEC-Q100 Grade 1 qualification-designed specifically for automotive airbag crash sensing systems where high-g transient detection and functional safety are critical.
For engineers reviewing the MMA6525KW datasheet, MMA6525KW pinout, MMA6525KW application, or MMA6525KW equivalent, this page delivers verified technical context on its dual-axis arming logic, programmable low-pass filtering (50–1000 Hz), offset cancellation capability (<0.25 LSB/s slew), 16-pin QFN package, and SafeAssure functional safety architecture.
Technical Context
The MMA6525KW integrates two independent over-damped MEMS g-cells (X/Y axes), each with configurable arming outputs (ARM_X/ARM_Y), a 12-bit ΣΔ ADC, and a programmable SINC-based low-pass filter with 12 selectable cutoff frequencies. Its internal 8 MHz oscillator feeds a digitally controlled clock divider to support precise timing across filter modes.
It implements independent register arrays for X/Y axes-including LPF configuration (LPF_X[3:0]/LPF_Y[3:0]), self-test deflection calibration (STDEFL_X/Y), and arming mode control (APS_X/Y, AWS_XP/N)-enabling axis-specific response tuning without cross-axis interference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±105g per axis - enables reliable detection of severe frontal/side crash events in automotive airbag ECUs. |
| Digital Output Resolution | 12-bit signed/unsigned SPI - provides 4096 discrete levels for high-precision acceleration quantization. |
| Low-Pass Filter Options | 12 configurations (50–1000 Hz) - allows system-level noise rejection tuning for specific vehicle crash pulse profiles. |
| Offset Cancellation | >6 s averaging period, <0.25 LSB/s slew rate - ensures stable zero-g baseline under thermal drift and long-term aging. |
| Supply Voltage | 3.3 V or 5.0 V single supply - supports legacy 5 V and modern 3.3 V automotive microcontroller interfaces. |
| AEC-Q100 Qualification | Grade 1 (−40°C to +105°C ambient) - validated for under-hood and passenger compartment deployment. |
| Power Supply Monitor | VCC_UV_f = 2.74 V, VREG_UV_f = 2.10 V - ensures deterministic reset behavior during brown-out conditions. |
Pinout & Package
Pb-Free 16-pin QFN, 6 mm × 6 mm, Case 2086-01, with exposed die attach pad internally connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREGA | Analog supply input | Provides regulated 2.5 V for analog front-end; requires 1 μF decoupling to VSSA per Figure 1. |
| VSS / VSSA | Digital/analog ground | Separate ground returns prevent noise coupling between digital logic and sensitive analog sensor paths. |
| ARM_X / ARM_Y | Configurable arming output | Open-drain output supporting active-low/high arming or PCM-mode acceleration proportional signal. |
| MISO / MOSI / SCLK / CS | SPI interface | Standard 4-wire SPI with 120 ns minimum SCLK period; MISO valid within 60 ns of CS assertion. |
| TEST/VPP | Factory programming voltage | Must be tied to VSS in application; not user-accessible during normal operation. |
| N/C (Pins 14, 15) | No-connect | Not internally bonded; may be left floating or tied to VSS for mechanical stability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-axis independent arming | Each axis has dedicated ARM_X/ARM_Y pins with programmable activation thresholds and response modes-enabling asymmetric crash detection logic. |
| Twelve low-pass filter options | Four-pole filters at 50/150/200/400/500/1000 Hz and three-pole at 200/400 Hz-matching ISO 26262 ASIL-B timing requirements for airbag deployment latency. |
| Self-test with factory-trimmed deflection | On-chip electrostatic self-test with stored STDEFL_X/Y registers-enables production-line and in-system diagnostics without external stimulus. |
| SafeAssure functional safety architecture | Includes CRC-protected register arrays, DEVRES flag monitoring, and power supply fault detection-supporting ISO 26262 ASIL-B compliance evidence. |
| Over-damped MEMS sensing element | Natural frequency 10.8–15.9 kHz, damping ratio 2.46–9.36-eliminates resonance-induced false triggers during high-frequency road noise or engine vibration. |
Applications
| Frontal Crash Detection | Side-Impact Sensing |
|---|---|
Use Scenario: Detects rapid deceleration (>30g) during head-on collisions to trigger driver/passenger airbag deployment within 15 ms. IC Role / Device Role / Timing Role: Primary crash sensor providing real-time X-axis acceleration data via SPI to airbag ECU; arming output drives pyro initiator directly. Use Value: ±105g range and 400 Hz LPF option ensure accurate pulse capture while rejecting suspension bounce artifacts below 100 Hz. | Use Scenario: Mounted in B-pillar or door to sense lateral acceleration during T-bone impacts. IC Role / Device Role / Timing Role: Y-axis accelerometer delivering synchronized 12-bit data to ECU; ARM_Y asserts within 1.51 μs of threshold crossing. Use Value: Independent Y-axis arming logic enables fast, isolated side-impact decision making without X-axis interference. |
| Roll-Over Detection | Pre-Crash System Input |
Use Scenario: Monitors angular acceleration during vehicle rollover events using combined X/Y vector magnitude. IC Role / Device Role / Timing Role: Dual-axis inertial sensor feeding fused orientation algorithm in ADAS domain controller. Use Value: Cross-axis sensitivity <±4% ensures minimal vector error during high-g rotational transients. | Use Scenario: Provides early crash signature data to pre-tension seatbelts and adjust seat position before impact. IC Role / Device Role / Timing Role: High-speed SPI interface delivers sub-37 μs data path latency (LPF=0) to predictive safety processor. Use Value: 64/fOSC DSP sample rate (125 kHz @ 8 MHz) enables 10× oversampling for robust edge detection in noisy environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-axis automotive accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA6527KW | ±120g full-scale range; identical pinout, SPI interface, and AEC-Q100 Grade 1 rating. | Higher range suits heavy-duty vehicles or enhanced side-impact detection requiring >105g margin. | Select when crash pulse modeling predicts peak acceleration exceeding 105g; no PCB changes required. |
| ADXL312WBRDZ-RL | 3-axis, 13-bit output, I²C/SPI interface; AEC-Q100 Grade 2 (−40°C to +105°C); no integrated arming outputs. | Lacks dedicated ARM_X/Y pins; requires external logic for airbag triggering; broader bandwidth (1600 Hz). | Choose for multi-axis inertial measurement where arming is handled by host MCU; verify timing compliance with airbag deployment deadlines. |
Compared with MMA6525KW, MMA6527KW offers higher range headroom with identical footprint and safety certification, while ADXL312WBRDZ-RL provides 3-axis data at the cost of added system complexity for arming logic and reduced functional safety integration.
Availability
MMA6525KW is available at Aetrix Electronics and suitable for automotive airbag control units, rollover detection modules, and pre-crash safety systems requiring stable component supply, AEC-Q100 compliance, and functional safety traceability.
Supply support for MMA6525KW 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.
The MMA65xx family was developed as part of NXP's SafeAssure portfolio to deliver ASIL-B-capable inertial sensors for automotive safety-critical systems-specifically targeting airbag electronic control units requiring high-g, dual-axis, SPI-based crash sensing with integrated functional safety features.
FAQ
What is the full-scale range of the MMA6525KW?
The MMA6525KW has a ±105g full-scale range on both the X-axis and Y-axis, as specified in the ordering information table and electrical characteristics section of the datasheet. This range is factory-configured and distinct from the ±80g (MMA6519KW) and ±120g (MMA6527KW) variants in the same MMA65xx family. The 105g range balances sensitivity and headroom for typical automotive frontal and side-impact crash pulses.
Does the MMA6525KW support offset cancellation, and how does it work?
Yes, the MMA6525KW supports optional offset cancellation with a >6 s averaging period and <0.25 LSB/s slew rate, as documented in Section 2.4, Table 67b–70b. When enabled, it continuously measures and corrects for DC offset drift using internal logic that updates correction values every ~1.05 ms. The resulting offset at 0g is stabilized to ±0.25 LSB (signed 12-bit), significantly improving long-term zero-g accuracy under thermal stress.
What are the key AEC-Q100 qualifications for the MMA6525KW?
The MMA6525KW is qualified to AEC-Q100 Revision G, Grade 1, covering an operating ambient temperature range of −40°C to +105°C. It meets all stress tests including powered/unpowered shock (±1500g/±2000g), drop shock (1.2 m), ESD (HBM ±2000 V), and thermal cycling. These qualifications are explicitly stated in the "Referenced Documents" section and verified through qualification testing per Note 5 in the datasheet.
Can the ARM_X and ARM_Y pins be used for purposes other than arming?
Yes-the ARM_X and ARM_Y pins are functionally configurable via the DEVCFG register. In addition to open-drain arming outputs (active-low or active-high), they can be set to output a PCM signal proportional to the corresponding axis acceleration data. This dual-mode capability is defined in Sections 3.8.10 and 3.8.11, allowing flexible integration with host processors that prefer analog-like digital streaming over discrete event triggering.
What is the maximum SPI clock frequency supported by the MMA6525KW?
The MMA6525KW supports a minimum SCLK period of 120 ns (maximum 8.33 MHz), as specified in Table 149 (tSCLK). Timing parameters assume CMISO ≤ 80 pF and RMISO ≥ 10 kΩ. The internal oscillator runs at 7.6–8.4 MHz, and SPI timing is derived directly from this source, ensuring deterministic synchronization without external clock dependencies.
MMA6525KW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-QFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Digital
- Axis:
- X, Y
- Acceleration Range:
- ±105g
- Sensitivity (LSB/g):
- 18.2
- Sensitivity (mV/g):
- -
- Bandwidth:
- -
- Output Type:
- SPI
- Voltage - Supply:
- 3.135V ~ 5.25V
- Features:
- Selectable Low Pass Filter
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (6x6)
MMA6525KW FAQ
1.How can I place an order for MMA6525KW through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA6525KW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MMA6525KW reliable?
The price and inventory of MMA6525KW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA6525KW is usually 5 days.
3.What payment methods are accepted for MMA6525KW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA6525KW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA6525KW?
MMA6525KW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA6525KW order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MMA6525KW?
For technical support, including MMA6525KW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA6525KW requirements.
6.How does Aetrix verify that MMA6525KW is sourced from the original manufacturer or authorized distributors?
All MMA6525KW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MMA6525KW meets industry standards.
7.What is the process for return or replacement of MMA6525KW?
All MMA6525KW units undergo pre-shipment inspection (PSI). If there is an issue with MMA6525KW, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MMA6525KW part is unused and in its original packaging.
Return procedure for MMA6525KW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMA6525KW Tags
-
MXC4005XC
Memsic Inc.
-
MC3419
Memsic Inc.
-
MC3479
Memsic Inc.
-
MXC6655XA
Memsic Inc.
-
MC3630
Memsic Inc.
.jpg)
-
LIS2HH12TR
STMicroelectronics
-
KX122-1037
Kionix Inc.
-
LIS2DE12TR
STMicroelectronics
-
LIS2DH12TR
STMicroelectronics
-
MC3635
Memsic Inc.
-
LIS2DS12TR
STMicroelectronics
-
LIS3DHTR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
