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NXP Semiconductors MMA1725W
- Part No.:
- MMA1725W
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA1725W.pdf
- Description:
- ACCELEROMETER 250G PCM/SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,550
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Product details
Overview
MMA1725W from NXP Semiconductors (formerly Freescale) is a Z-axis ±250 g DSI3-compatible inertial sensor designed for automotive safety and chassis control systems. It delivers 10-bit acceleration data via DSI3 interface, features six selectable low-pass filters (180–1200 Hz), operates from −40°C to +125°C, and uses a daisy-chainable 16-pin QFN (6 × 6 mm) package with high-side bus switch output driver.
For engineers reviewing the MMA1725W datasheet, MMA1725W pinout, MMA1725W application, or MMA1725W equivalent, this page provides verified technical context, exact pin functions, real-world use scenarios in vehicle rollover detection and electronic stability control, and confirmed alternative parts with documented functional differences.
Technical Context
The MMA1725W implements an overdamped MEMS g-cell optimized for Z-axis sensing, with natural frequency of 15 kHz and damping ratio of 1.4–2.9. Its signal chain includes a ΣΔ ADC, sinc filter, programmable IIR high-pass filter, and digital interpolation engine delivering 1 μs effective sample resolution from 16 μs internal sampling.
DSI3 compliance enables three operational modes: Discovery Mode for physical node identification, Command and Response Mode for register configuration, and Periodic Data Collection Mode with Background Diagnostic support-enabling robust fault-tolerant deployment in ASIL-B automotive networks without external microcontroller intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Axis & Range | Z-axis ±250 g full-scale range, calibrated for vertical acceleration measurement in vehicle mounting orientation. |
| Interface Protocol | DSI3-compliant physical layer with high-side bus switch output driver for daisy-chained topology. |
| Operating Temperature | −40°C to +125°C ambient, qualified per AEC-Q100 Rev G for under-hood and chassis applications. |
| Filter Options | Six configurable low-pass filters: LPF0 (180 Hz, 2-pole) to LPF14 (1200 Hz, 4-pole), enabling noise vs. response trade-off tuning. |
| Output Resolution | 10-bit signed digital output (−511 to +511 LSB), with sensitivity of 1.9456 LSB/g at ±250 g range. |
| Supply Voltage | 4.0 V to 20.0 V on BUS_I pin; internal regulators generate VREG (2.4–2.6 V) and VBUF (3.25–3.55 V) for analog/digital domains. |
| Self-Test Capability | Active electrostatic self-test with defined output shift (80–160 LSB), accuracy ±10% over full temperature range. |
Pinout & Package
Package: 16-pin QFN, 6 mm × 6 mm × 2 mm, case 2086-01, Pb-free, exposed die attach pad (internally connected to VSS).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BUS_O | Supply out | Provides regulated supply to next daisy-chained device; requires external capacitor to VSS. |
| BUS_I | Supply and communication input | Main DSI3 bus power input (4–20 V); connects internally to sense resistor for current monitoring. |
| BUSRTN | Supply return | DSI3 bus ground reference; must be tied to system ground plane. |
| BUSSW | Bus switch gate drive | Drives external p-channel FET gate for high-side daisy-chain switching; requires external pullup resistor. |
| VBUF | Buffer regulator supply | Power rail for internal buffer regulator; decoupled with 1 μF ceramic capacitor to VSS. |
| VREG / VREGA | Internal circuitry supplies | Dual regulated rails (2.4–2.6 V) for digital logic and analog front-end; each requires dedicated 1 μF decoupling. |
| VSS | Internal supply return | Common return for all internal regulators; must be connected to BUSRTN. |
| PCM | Pulse code modulated output | 4 MHz test output proportional to acceleration; unused in production-leave unconnected. |
| TEST pins (1–6) | Factory test interfaces | Reserved for manufacturing test; must be tied to VSS (TEST, TEST2) or left unconnected (others) in application. |
Key Features
| Feature | Design Value |
|---|---|
| DSI3 Discovery Mode | Enables automatic physical location identification on multi-node bus without host software mapping. |
| Background Diagnostic Mode | Runs continuous health checks (offset monitor, clipping detection) during active data collection-no interrupt or mode switch required. |
| Overdamped Z-axis g-cell | Optimized mechanical design (ζ = 1.4–2.9) eliminates resonance-induced measurement error in high-vibration chassis environments. |
| Fast-start IIR high-pass filter | Compensates for tilt-induced DC offset within milliseconds, supporting rapid vehicle dynamics capture after ignition. |
| Interpolated 1 μs timing resolution | Converts native 16 μs sampling into sub-microsecond timestamped outputs for precise event correlation in ECU loggers. |
Applications
| Rollover Detection System | Electronic Stability Control (ESC) |
|---|---|
Use Scenario: Real-time monitoring of vehicle pitch and roll angles during aggressive maneuvers or off-road operation. IC Role / Device Role / Timing Role: Primary Z-axis inertial sensor providing acceleration data to ESC ECU for rollover risk calculation. Use Value: ±250 g range accommodates extreme transient loads; 1200 Hz LPF option supports high-bandwidth yaw-rate fusion without aliasing. | Use Scenario: Closed-loop correction of lateral slip during cornering or emergency braking on low-friction surfaces. IC Role / Device Role / Timing Role: Z-axis reference for gravity vector estimation used to decouple dynamic acceleration from static tilt. Use Value: Fast-start IIR high-pass filter stabilizes gravity vector within 70 ms, enabling accurate tilt compensation before brake actuation. |
| Advanced Airbag Deployment | Heavy-Duty Vehicle Suspension Monitoring |
Use Scenario: Discriminating between crash events and benign road impacts (e.g., potholes, speed bumps) using Z-axis acceleration profile analysis. IC Role / Device Role / Timing Role: Safety-critical sensor feeding pre-crash algorithms with validated acceleration magnitude and duration data. Use Value: Self-test capability (±10% accuracy) and background diagnostics ensure functional integrity prior to airbag deployment decision. | Use Scenario: Continuous monitoring of suspension travel and load transfer in commercial trucks and construction equipment. IC Role / Device Role / Timing Role: Z-axis accelerometer integrated into cab-mounted ECU for ride quality analytics and predictive maintenance alerts. Use Value: −40°C to +125°C operating range and AEC-Q100 qualification guarantee reliability in extended outdoor exposure and engine bay proximity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inertial sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA2725W | X-axis ±250 g variant; identical DSI3 interface, pinout, and electrical specs except axis orientation and g-cell calibration. | Designed for horizontal mounting (e.g., longitudinal crash sensing); not interchangeable without mechanical reorientation. | Select MMA2725W only when X-axis measurement is required and PCB layout allows rotation. |
| ADXL313 | I²C/SPI interface, ±200 g range, 13-bit resolution, no DSI3 support or daisy-chain capability. | Requires host MCU for protocol handling and diagnostics; lacks built-in discovery and background diagnostic modes. | Choose ADXL313 for non-automotive, cost-sensitive designs where DSI3 infrastructure is unavailable. |
Compared with MMA2725W, the MMA1725W provides identical performance and interface functionality but is mechanically optimized for Z-axis mounting-eliminating need for coordinate transformation in vertical-sensing applications. Versus ADXL313, it trades MCU dependency for autonomous DSI3 network operation, reducing system-level complexity in automotive ECUs.
Availability
MMA1725W is available at Aetrix Electronics and suitable for automotive safety systems, chassis control modules, and heavy-duty vehicle telematics requiring stable component supply across extended product lifecycles.
Supply support for MMA1725W 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 markets.
The MMA17XXW series belongs to NXP's Xtrinsic inertial sensor portfolio, engineered specifically for ASIL-B automotive safety applications requiring robust DSI3 integration, high-temperature operation, and built-in diagnostics.
FAQ
What is the primary sensing axis and full-scale range of the MMA1725W?
The MMA1725W is a single-axis Z-axis accelerometer with a nominal full-scale range of ±250 g. Its mechanical design and calibration are optimized for vertical acceleration measurement in automotive chassis and safety systems. The g-cell exhibits a natural frequency of 15 kHz and damping ratio of 1.4–2.9, ensuring overdamped response free from resonance artifacts. This specification is explicitly confirmed in the ordering table and electrical characteristics section of the MMA27XXW/MMA17XXW datasheet.
Does the MMA1725W support daisy-chaining, and how is it implemented?
Yes, the MMA1725W supports daisy-chaining via its DSI3 interface and BUSSW pin. The BUSSW terminal drives the gate of an external p-channel MOSFET, enabling high-side switching of the BUS_I line to the next device in the chain. BUS_O provides the regulated supply output to that downstream device. This architecture allows up to 32 nodes on a single DSI3 bus without additional level-shifting or isolation components. The implementation is detailed in Section 1.3 (Application Diagram) and Section 3.6.4 (Bus Switch Driver) of the official datasheet.
What are the key diagnostic capabilities built into the MMA1725W?
The MMA1725W integrates three autonomous diagnostic features: (1) continuous offset monitoring with ±70 LSB limit for ±250 g Z-axis operation, (2) background diagnostic mode that runs concurrently with periodic data collection, and (3) electrostatic self-test with guaranteed output shift of 80–160 LSB and ±10% accuracy over −40°C to +125°C. These functions require no host intervention and are enabled by default per SafeAssure design principles. All are verified in Sections 2.4, 2.5, and 3.7 of the MMA27XXW/MMA17XXW datasheet.
Can the MMA1725W operate outside the standard automotive voltage range?
The MMA1725W is rated for BUS_I supply voltages from 4.0 V to 20.0 V, with transient tolerance up to +25.0 V for ≤10 μs. Its internal regulators (VREG, VREGA, VBUF) maintain stable outputs across this range, and undervoltage lockout triggers at 3.60–3.90 V (VBUS_I_UV_F). Operation below 4.0 V is not supported-attempting to power the MMA1725W at 3.3 V will prevent initialization and cause bus communication failure. This behavior is specified in Table 2 (Electrical Characteristics, rows 27 and 46) of the datasheet.
Is the MMA1725W pin-compatible with other devices in the MMA27XXW/17XXW family?
Yes, the MMA1725W shares identical 16-pin QFN (2086-01) packaging and pinout with all members of the MMA27XXW/17XXW family, including MMA2725W, MMA1725WR2, and MMA2702W. Pin assignments for BUS_I, BUS_O, BUSSW, VREG, VBUF, and VSS are functionally and physically identical across variants. Axis orientation and full-scale range are the only differentiating parameters-no PCB redesign is needed when substituting within the same package variant, provided mechanical mounting aligns with the intended sensing axis.
MMA1725W 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:
- Z
- 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)
MMA1725W FAQ
1.How can I place an order for MMA1725W through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA1725W 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 MMA1725W reliable?
The price and inventory of MMA1725W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA1725W is usually 5 days.
3.What payment methods are accepted for MMA1725W?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA1725W transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA1725W?
MMA1725W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA1725W 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 MMA1725W?
For technical support, including MMA1725W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA1725W requirements.
6.How does Aetrix verify that MMA1725W is sourced from the original manufacturer or authorized distributors?
All MMA1725W 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 MMA1725W meets industry standards.
7.What is the process for return or replacement of MMA1725W?
All MMA1725W units undergo pre-shipment inspection (PSI). If there is an issue with MMA1725W, 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 MMA1725W part is unused and in its original packaging.
Return procedure for MMA1725W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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