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NXP Semiconductors MMA8125EGR2
- Part No.:
- MMA8125EGR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MMA8125EGR2.pdf
- Description:
- ACCEL 250G DSI/SPI 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,883
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Product details
Overview
MMA8125EGR2 from NXP (formerly Freescale) is a Z-axis single-axis digital accelerometer IC designed for automotive crash detection and impact monitoring. It delivers 10-bit DSI 2.0–compliant serial output, operates from 6.3 V to 30 V, features an integrated voltage regulator, and is qualified to AEC-Q100 Grade 1 (−40°C to +125°C) in a 16-pin SOIC package.
For engineers reviewing the MMA8125EGR2 datasheet, MMA8125EGR2 pinout, MMA8125EGR2 application, or MMA8125EGR2 equivalent, key selection considerations include its 250g full-scale range, Z-axis orientation, DSI bus interface timing, undervoltage fault handling via HCAP monitoring, and ground-loss detection capability using VGND/DIN.
Technical Context
The MMA8125EGR2 integrates a variable-capacitance Z-axis sensing element with a dedicated interface IC that performs capacitance-to-voltage conversion, two-stage switched-capacitor amplification with factory-trimmed offset/gain, and a Bessel low-pass filter (configurable as 180 Hz 2-pole or 400 Hz 4-pole). Its analog signal path feeds a 10-bit ADC before serial formatting.
Communication occurs over the DSI 2.0 bus using short-word (8-bit) or long-word (16-bit) commands; it supports reverse initialization for fault-tolerant daisy-chain networks. Internal power derives from BUSIN/BUSOUT rectification, regulated via external HCAP and CREG capacitors, with built-in undervoltage detection and POR reset behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Axis Orientation | Z-axis only - mechanical sensitivity aligned perpendicular to package top surface |
| Full-Scale Range | ±250g - calibrated range enabling high-impact crash event detection without saturation |
| Output Resolution | 10-bit digital - provides 1024 discrete acceleration levels across full scale |
| Supply Voltage | 6.3 V to 30 V - compatible with automotive battery systems including load-dump transients |
| Operating Temperature | −40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood deployment |
| Interface Standard | DSI 2.0 compliant - supports daisy-chained bus topology with reverse initialization capability |
| Filter Options | 180 Hz 2-pole or 400 Hz 4-pole Bessel - selectable via OTP TYPE register bit ORDER for optimized shock vs. vibration discrimination |
Pinout & Package
Package: 16-pin SOIC (Case 475-01), RoHS-compliant, surface-mountable with standard reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 15 | N/C | No internal connection - must be left floating or tied to ground per layout best practice |
| 2, 4, 14 | VSS | Power return node - internally connected to BUSRTN; all must connect to common system ground plane |
| 5, 16 | CREG | Voltage regulator stability capacitor terminal - requires low-ESR ceramic capacitor (≥1 μF) to VSS |
| 6 | BUSRTN | DSI bus common return - shared reference for power and signaling; connects to chassis ground in single-ended mode |
| 7 | VPP/TEST | OTP programming/test voltage input - factory-used; must be connected to ground in application |
| 8 | HCAP | Hold capacitor node - stores energy for DSI bus transitions; requires low-ESR capacitor (1 μF typical) to VSS |
| 9 | CFIL | Analog filter output - buffered access to filtered sensor signal pre-ADC; used for diagnostics or external monitoring |
| 10 | DOUT | DSI data output - bidirectional serial data line; driven by device during response transmission |
| 11 | VGND/DIN | Ground-loss detection input - sources constant current to monitor resistance between module and chassis ground |
| 12 | CLK | Test-mode clock input - unused in normal operation; leave unconnected unless in test mode |
| 13 | BUSIN | DSI bus input - primary command/data input from master; supports reverse initialization when BUSOUT is used as input |
| 14 | BUSOUT | DSI bus output - drives downstream devices in daisy chain; configurable as reverse-init input during fault recovery |
Key Features
| Feature | Design Value |
|---|---|
| Z-axis transducer with overdamped response | Minimizes resonance artifacts during high-slew crash events, improving impact pulse fidelity |
| Internal self-test with factory-trimmed voltage | Enables in-system functional verification without mechanical stimulus or external equipment |
| 80 customer-accessible OTP bits | Allows storage of calibration offsets, device ID, configuration flags (e.g., GLDE, DDIS), and custom attributes |
| Ground-loss detection (GLDE-enabled) | Monitors open-circuit faults between module VSS and chassis ground, reporting via GF flag in status byte |
| Undervoltage monitoring on HCAP | Triggers automatic reset and zero-data response if hold capacitor voltage drops below threshold for >1 ms |
Applications
| Crash Detection (Airbag Deployment) | Impact Monitoring (Industrial Machinery) |
|---|---|
Use Scenario: Mounted on vehicle passenger compartment structure to detect rapid deceleration during frontal/side collisions. IC Role / Device Role / Timing Role: Z-axis accelerometer providing real-time acceleration magnitude and sign to airbag control unit for deployment decision logic. Use Value: 250g range prevents clipping during severe crashes; AEC-Q100 qualification ensures reliability in harsh automotive environments. | Use Scenario: Installed on rotating equipment housings to log impact events indicating bearing failure or misalignment. IC Role / Device Role / Timing Role: Standalone shock event detector triggering maintenance alerts when acceleration exceeds programmable thresholds. Use Value: Overdamped Z-axis response rejects high-frequency vibration noise while preserving true impact amplitude and timing. |
| Vibration Health Monitoring (Railway Systems) | Shock Detection (Heavy-Duty Vehicle Telematics) |
Use Scenario: Embedded in railcar suspension nodes to capture vertical shock loads during track irregularities or coupling events. IC Role / Device Role / Timing Role: Z-axis motion sensor feeding time-domain waveform data to edge analytics for predictive maintenance modeling. Use Value: 10-bit resolution and Bessel filtering enable accurate spectral content capture below 400 Hz for fatigue analysis. | Use Scenario: Integrated into trailer-mounted telematics units to record cargo-handling shocks during loading/unloading operations. IC Role / Device Role / Timing Role: Event-triggered accelerometer logging peak g-levels and timestamps for compliance reporting and claims verification. Use Value: Wide 6.3–30 V supply range accommodates variable truck electrical system voltages without external regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-axis accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA8115EGR2 | Same 16-pin SOIC package and DSI 2.0 interface, but ±150g full-scale range and lower sensitivity | Suitable for moderate-impact applications where 250g headroom is unnecessary; reduced dynamic range improves low-g resolution | Select when system-level shock profiles stay below 150g and higher resolution at lower g-levels is prioritized |
| ADXL372BCCZ | 3-axis, 2000g range, SPI interface, 2.25 V to 3.6 V supply, LGA package - no DSI or automotive qualification | Designed for ultra-low-power wearable impact detection, not automotive crash systems; lacks ground-loss detection and bus fault tolerance | Consider only for non-automotive, battery-powered, multi-axis applications requiring different interface and supply constraints |
Compared with MMA8115EGR2, the MMA8125EGR2 provides higher impact margin for crash-critical systems; compared with ADXL372BCCZ, it offers automotive-grade robustness, DSI bus integration, and system-level fault monitoring features essential for safety-relevant deployments.
Availability
MMA8125EGR2 is available at Aetrix Electronics and suitable for automotive airbag control units, industrial impact loggers, railway health monitors, and heavy-duty vehicle telematics requiring stable component supply across extended temperature and voltage ranges.
Supply support for MMA8125EGR2 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 company specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The MMA81XXEG series was developed by Freescale (now NXP) specifically for satellite accelerometer modules in automotive safety systems, emphasizing DSI bus interoperability, AEC-Q100 compliance, and integrated fault diagnostics.
FAQ
What is the full-scale acceleration range of the MMA8125EGR2?
The MMA8125EGR2 has a calibrated full-scale range of ±250g along the Z-axis. This range is factory-programmed and verified, enabling reliable detection of high-magnitude crash events without signal saturation. The range is stored in OTP bits RNG2–RNG0 (value 110 binary) and cannot be altered in the field. All signal conditioning-including gain, offset, and filter characteristics-is optimized for this 250g span.
Does the MMA8125EGR2 support X-axis or dual-axis sensing?
No, the MMA8125EGR2 is strictly a Z-axis single-axis accelerometer. Its sensing element is physically oriented to respond only to acceleration perpendicular to the top surface of the 16-pin SOIC package. The AXIS bit in the OTP TYPE register is set to '0', confirming Z-axis orientation. For X-axis applications, Freescale's MMA82XXEG family (e.g., MMA8225EGR2) is required.
How does the MMA8125EGR2 handle power supply variations in automotive environments?
The MMA8125EGR2 accepts 6.3 V to 30 V on BUSIN/BUSOUT, accommodating automotive battery fluctuations and load-dump transients. Internally, it rectifies this input and regulates it via an integrated circuit powered by the external HCAP capacitor. If HCAP voltage drops below threshold for >1 ms, the device asserts POR and halts communication until stable voltage resumes-ensuring deterministic behavior during brownout conditions.
Can the MMA8125EGR2 be used without connecting the VGND/DIN pin?
Yes, but only if ground-loss detection is disabled. When GLDE = 0 in DEVCFG2, VGND/DIN may be left unconnected or tied to BUSRTN. However, if GLDE = 1, VGND/DIN must be connected to chassis ground through a defined resistor network per Figure 1-5 to enable open-ground fault detection. Leaving it floating with GLDE enabled will cause false ground-loss assertions and zero-data responses.
What filter options are available on the MMA8125EGR2 and how are they selected?
The MMA8125EGR2 offers two Bessel low-pass filter configurations: 180 Hz (2-pole) and 400 Hz (4-pole), selected via the ORDER bit in the OTP TYPE register (address $04, bit 7). A value of '0' selects 400 Hz; '1' selects 180 Hz. This setting is factory-programmed and fixed for the MMA8125EGR2. The filter is implemented in the analog signal path prior to the 10-bit ADC and also appears at the CFIL pin.
MMA8125EGR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Digital
- Axis:
- Z
- Acceleration Range:
- ±250g
- Sensitivity (LSB/g):
- 1
- Sensitivity (mV/g):
- -
- Bandwidth:
- -
- Output Type:
- DSI, SPI
- Voltage - Supply:
- 6.3V ~ 30V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MMA8125EGR2 FAQ
1.How can I place an order for MMA8125EGR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA8125EGR2 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 MMA8125EGR2 reliable?
The price and inventory of MMA8125EGR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA8125EGR2 is usually 5 days.
3.What payment methods are accepted for MMA8125EGR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA8125EGR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA8125EGR2?
MMA8125EGR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA8125EGR2 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 MMA8125EGR2?
For technical support, including MMA8125EGR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA8125EGR2 requirements.
6.How does Aetrix verify that MMA8125EGR2 is sourced from the original manufacturer or authorized distributors?
All MMA8125EGR2 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 MMA8125EGR2 meets industry standards.
7.What is the process for return or replacement of MMA8125EGR2?
All MMA8125EGR2 units undergo pre-shipment inspection (PSI). If there is an issue with MMA8125EGR2, 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 MMA8125EGR2 part is unused and in its original packaging.
Return procedure for MMA8125EGR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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