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NXP Semiconductors MMA2725W
- Part No.:
- MMA2725W
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA2725W.pdf
- Description:
- ACCELEROMETER 250G PCM/SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,084
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Product details
Overview
MMA2725W from NXP (formerly Freescale) is a DSI3-compatible, X-axis satellite accelerometer with ±250 g full-scale range, designed for automotive inertial sensing in harsh environments. It features overdamped MEMS sensing element (ζ = 1.26–2.0), 16 μs internal sample rate with 1 μs interpolation, six selectable low-pass filters (180–1200 Hz), and integrated high-side bus switch for daisy-chain topology. Used in airbag deployment systems and rollover detection where high-g shock survivability and deterministic timing are critical.
For engineers reviewing the MMA2725W datasheet, MMA2725W pinout, MMA2725W application, or MMA2725W equivalent, this page delivers verified technical context including DSI3 Discovery Mode operation, self-test response latency (1.0–4.0 ms depending on LPF), offset cancellation performance (±1 LSB post-compensation), and AEC-Q100 Grade 1 qualification for -40°C to +125°C operation.
Technical Context
The MMA2725W implements a sigma-delta ADC with sinc filter, followed by programmable DSP-based low-pass filtering (2- to 4-pole options) and a single-pole IIR high-pass filter with fast startup. Its DSI3 physical layer supports three operational modes: Discovery Mode for physical node identification via current-sense address assignment, Command and Response Mode for register configuration, and Periodic Data Collection Mode with Background Diagnostic Mode enabled concurrently.
Internally regulated supplies include VBUF (3.25–3.55 V), VREG/VREGA (2.4–2.6 V), all supported by external 1 μF ceramic capacitors. The device uses an internal oscillator and includes dedicated test pins (TEST_SCLK, TEST_MISO, etc.) disabled in production - only BUS_I, BUS_O, BUSRTN, BUSSW, PCM, and VSS are active in standard DSI3 bus operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-scale range | ±250 g X-axis - enables detection of severe crash events and rollover dynamics without clipping up to 2300 g mechanical input (sensing element limit) |
| DSI3 interface | Compliant with DSI3 Standard Rev. 1.0 - supports daisy-chained topology with high-side bus switch (BUSSW) and Discovery Mode addressing |
| Operating temperature | -40°C to +125°C - qualified per AEC-Q100 Rev. G for under-hood and safety-critical automotive applications |
| Low-pass filter options | Six selectable cutoffs: 180 Hz, 325 Hz, 400 Hz (2×), 800 Hz, 1200 Hz - allows trade-off between noise rejection and phase delay for control-loop stability |
| Internal sample rate | 16 μs (62.5 kHz) with interpolation to 1 μs resolution - ensures precise timestamping of acceleration transients in safety algorithms |
| Offset after cancellation | ±1 LSB (10-bit output) - guarantees minimal baseline drift over temperature and lifetime, critical for zero-g reference integrity |
| Self-test activation time | 1.0–4.0 ms depending on LPF setting - enables rapid functional verification during power-on self-test (POST) sequences |
Pinout & Package
Pb-Free 16-pin QFN package, 6 mm × 6 mm × 2 mm, case 2086-01. Exposed die attach pad internally connected to VSS.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| BUS_I | DSI supply and communication input | Primary power and bidirectional DSI3 command/data line; requires 220 pF EMC capacitor to BUSRTN |
| BUS_O | DSI supply output | Supplies next slave in daisy chain; requires 220 pF capacitor to VSS |
| BUSRTN | DSI supply return | Common return for DSI3 bus; must be connected to system ground plane with low-inductance path |
| BUSSW | High-side bus switch gate drive | Drives external P-channel FET to enable daisy-chain mode; requires external pullup resistor |
| PCM | Pulse code modulated output | 4 MHz test signal proportional to acceleration; unused in production - leave unconnected |
| VBUF | Buffer regulator supply | Provides EMC-immune internal regulation; requires 1 μF ceramic capacitor to VSS |
| VREG / VREGA | Internal circuitry supplies | Dual regulated rails for analog/digital blocks; each requires 1 μF ceramic capacitor to VSS/VSSA |
| VSS | Internal supply return | Common ground for all internal regulators; must be tied to BUSRTN |
Key Features
| Feature | Design Value |
|---|---|
| Overdamped MEMS element | ζ = 1.26–2.0 eliminates resonance-induced measurement error during high-frequency vibration (e.g., engine harmonics) |
| Background Diagnostic Mode | Runs continuously during Periodic Data Collection - detects sensor faults without interrupting primary data stream |
| Fast offset cancellation | Two-phase startup (80 ms + 70 ms) achieves ±1 LSB stability before first valid acceleration reading |
| DSI3 Discovery Mode | Enables automatic physical location mapping on multi-node bus - eliminates manual address programming in assembly |
| Clipping resilience | Transducer limit at +2300 g / −3700 g (X-axis) and +2700 g / −3200 g (Z-axis) prevents saturation during severe crash pulses |
Applications
| Frontal Crash Detection | Rollover Sensing |
|---|---|
|
Use Scenario: Real-time monitoring of longitudinal deceleration during frontal impact to trigger airbag inflation within 20 ms. IC Role / Device Role / Timing Role: Primary X-axis inertial sensor providing 1 μs-interpolated acceleration data to safety ECU via DSI3 bus. Use Value: ±250 g range avoids clipping during 50–100 g crash pulses; 16 μs sampling ensures no transient is missed in critical decision window. |
Use Scenario: Detecting angular acceleration and sustained lateral g-forces during vehicle roll events to activate side-curtain airbags. IC Role / Device Role / Timing Role: Satellite accelerometer mounted on B-pillar or roof rail, reporting X-axis data over daisy-chained DSI3 network. Use Value: Overdamped design suppresses false triggers from road noise; AEC-Q100 Grade 1 rating ensures reliability at cabin temperatures up to 125°C. |
| Electronic Stability Control (ESC) Backup | Heavy-Duty Vehicle Rollover Warning |
|
Use Scenario: Redundant acceleration measurement in ESC modules where primary sensor fails or exceeds range. IC Role / Device Role / Timing Role: Secondary X-axis sensor feeding independent safety channel with synchronized DSI3 timestamps. Use Value: DSI3 Background Diagnostic Mode continuously validates sensor health without interrupting real-time data flow. |
Use Scenario: Monitoring lateral acceleration in Class 8 trucks and buses to warn drivers of imminent rollover during high-speed turns. IC Role / Device Role / Timing Role: High-g satellite accelerometer integrated into cab-mounted telematics unit with CAN gateway interface. Use Value: 1200 Hz LPF option preserves high-frequency cornering transients while rejecting suspension noise; -40°C to +125°C operation covers extreme ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inertial sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA2737W | ±375 g full-scale range; higher transducer clipping limit (+2300 g / −3200 g); identical DSI3 interface and package | Required where crash pulse amplitudes exceed ±250 g - e.g., heavy commercial vehicle frontal impact testing | Select MMA2737W when system-level crash modeling predicts peak acceleration >250 g; sensitivity reduced to 1.2967 LSB/g vs. 1.9456 LSB/g for MMA2725W |
| MMA2712W | ±125 g full-scale range; higher sensitivity (4.096 LSB/g); same DSI3 protocol stack and pinout | Better suited for low-g dynamics like brake assist or hill-start assist where resolution below 100 g is prioritized | Choose MMA2712W for passenger car applications requiring finer resolution at lower g-ranges; not suitable for rollover or high-severity crash detection |
Compared with MMA2725W, MMA2737W trades resolution for extended range in high-energy crash scenarios, while MMA2712W optimizes sensitivity for sub-100 g control functions - neither is pin-compatible nor drop-in; both require firmware scaling and calibration updates.
Availability
MMA2725W is available at Aetrix Electronics and suitable for automotive safety systems, rollover detection modules, and electronic stability control backup sensors requiring stable component supply across long production lifecycles.
Supply support for MMA2725W 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 automotive, industrial, and IoT applications, with deep expertise in sensor fusion and functional safety.
The MMA27XXW family was developed as part of NXP's SafeAssure portfolio to meet ASIL-B requirements for satellite accelerometers in automotive safety systems, emphasizing DSI3 interoperability and robustness in harsh environments.
FAQ
What is the DSI3 Discovery Mode function in the MMA2725W?
The MMA2725W uses DSI3 Discovery Mode to auto-identify its physical position on a daisy-chained bus by responding to current-sense commands. This eliminates manual address configuration during vehicle assembly. The MMA2725W implements this via its BUSSW pin driving an external high-side FET and BUS_O/BUS_I current sensing - a feature confirmed in the MMA27XXW datasheet Rev. 0.5 Section 4.1 and Figure 3.
Does the MMA2725W support simultaneous Periodic Data Collection and Background Diagnostic Mode?
Yes, the MMA2725W supports concurrent Periodic Data Collection Mode and Background Diagnostic Mode per Section 4.3 of the MMA27XXW datasheet. During normal operation, acceleration data is streamed at user-defined intervals while diagnostics run in parallel - ensuring continuous functional safety compliance without interrupting primary measurements.
What is the maximum mechanical shock survivability of the MMA2725W?
The MMA2725W withstands powered and unpowered shock up to ±2000 g (0.5 ms duration, six sides) and drop shock of 1.2 m onto concrete, tile, or steel - specifications explicitly listed in Table 2.1 of the MMA27XXW datasheet Rev. 0.5. These ratings apply directly to the MMA2725W variant as confirmed in the Ordering Information table.
How does the MMA2725W achieve ±1 LSB offset after cancellation?
The MMA2725W performs two-phase digital offset cancellation: Phase 1 (80 ms, 10 Hz cutoff) and Phase 2 (70 ms, 1 Hz cutoff), resulting in ±1 LSB residual error in 10-bit output. This is documented in Section 2.4, Table 71 of the MMA27XXW datasheet and applies specifically to the ±250 g X-axis variant MMA2725W.
Is the MMA2725W pinout compatible with other devices in the MMA27XXW family?
Yes, all MMA27XXW variants - including MMA2725W, MMA2737W, and MMA2712W - share identical 16-pin QFN (2086-01) pinout and footprint, as shown in Figure 2 and Table 1 of the MMA27XXW datasheet. This allows hardware reuse across range variants, though firmware scaling and calibration must be updated per full-scale setting.
MMA2725W Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- MMA
- Package/Case:
- 16-QFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Not For New Designs
- Type:
- Digital
- Axis:
- X
- Acceleration Range:
- ±250g
- Sensitivity (LSB/g):
- 2.048
- Sensitivity (mV/g):
- -
- Bandwidth:
- -
- Output Type:
- PCM, SPI
- Voltage - Supply:
- 4V ~ 20V
- 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)
MMA2725W FAQ
1.How can I place an order for MMA2725W through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA2725W 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 MMA2725W reliable?
The price and inventory of MMA2725W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA2725W is usually 5 days.
3.What payment methods are accepted for MMA2725W?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA2725W transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA2725W?
MMA2725W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA2725W 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 MMA2725W?
For technical support, including MMA2725W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA2725W requirements.
6.How does Aetrix verify that MMA2725W is sourced from the original manufacturer or authorized distributors?
All MMA2725W 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 MMA2725W meets industry standards.
7.What is the process for return or replacement of MMA2725W?
All MMA2725W units undergo pre-shipment inspection (PSI). If there is an issue with MMA2725W, 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 MMA2725W part is unused and in its original packaging.
Return procedure for MMA2725W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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