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NXP Semiconductors MMA8104EG
- Part No.:
- MMA8104EG
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MMA8104EG.pdf
- Description:
- ACCELEROMETER 40G DSI/SPI 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,142
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Product details
Overview
MMA8104EG from Freescale Semiconductor is a Z-axis single-axis digital accelerometer with DSI 2.0 interface, 40g full-scale range, 10-bit output resolution, and automotive AEC-Q100 qualification for crash detection and shock monitoring in safety-critical systems.
For engineers reviewing the MMA8104EG datasheet, MMA8104EG pinout, MMA8104EG application, or MMA8104EG equivalent, key selection considerations include its Z-axis orientation, 40g dynamic range, DSI 2.0 bus compatibility, integrated Bessel filter (180 Hz or 400 Hz), and ground-loss detection capability via VGND/DIN pin.
Technical Context
The MMA8104EG 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 180 Hz 2-pole or 400 Hz 4-pole). Its output is digitized by a 10-bit ADC before serial transmission via DSI 2.0.
Power is derived from the DSI bus (BUSIN/BUSOUT) through internal rectification and regulation; an external capacitor on HCAP supplies stored energy during data transmission. The device includes OTP memory (80 customer-accessible bits), self-test voltage generation, and ground-loss detection enabled via DEVCFG2[5].
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Axis Orientation | Z-axis only - mechanical sensitivity aligned perpendicular to package top surface |
| Full-Scale Range | ±40g - calibrated range enabling high-impact crash detection without saturation |
| Output Resolution | 10-bit digital - provides 1024 discrete acceleration levels across full scale |
| Interface Standard | DSI 2.0 compliant - supports daisy-chained satellite bus topology with reverse initialization |
| Supply Voltage Range | 6.3 V to 30 V - compatible with automotive battery systems including load-dump transients |
| Operating Temperature | −40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and airbag control module use |
| Filter Options | 180 Hz 2-pole or 400 Hz 4-pole Bessel - preserves signal phase integrity for timing-critical impact detection |
Pinout & Package
16-pin SOIC package (Case 475-01), RoHS-compliant, with internal VSS connections tied to BUSRTN and dual CREG pins for regulator stability redundancy.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 15, 16 | VSS | Internal supply return node - all four pins connect to BUSRTN; must be tied to chassis ground at single point |
| 2, 3 | N/C | No internal connection - left unconnected per design |
| 5, 14 | CREG | Voltage regulator stabilization node - requires external capacitor (1 μF typical) connected to VSS for stable operation |
| 6 | BUSRTN | Common return for power and signaling - serves as reference for BUSIN/BUSOUT and VSS nodes |
| 7 | VPP/TEST | OTP programming/test voltage input - connected to ground in final application per datasheet termination guidance |
| 8 | HCAP | Hold capacitor node - stores regulated charge for DSI communication; voltage monitored for undervoltage fault detection |
| 9 | CFIL | Analog filter output - buffered access to filtered sensor signal prior to ADC; used for external diagnostics or analog monitoring |
| 10 | DOUT | Test mode SPI data output - inactive during normal DSI operation; used only during manufacturing test or debug |
| 11 | VGND/DIN | Ground-loss detection input - sources constant current to monitor resistance between module and chassis ground |
| 12 | CLK | Test mode clock input - left unconnected in production; internal pull-up active when unused |
| 13 | BUSIN | Primary DSI bidirectional data line - supports standard and reverse initialization in daisy-chain configurations |
| 14 | BUSOUT | DSI daisy-chain output - connects to BUSIN of next device; functions as input during reverse initialization |
Key Features
| Feature | Design Value |
|---|---|
| Z-axis transducer with overdamped response | Minimizes resonance artifacts during high-g shock events, improving crash pulse fidelity |
| Integrated Bessel filter (180 Hz / 400 Hz) | Preserves phase linearity for accurate time-of-impact determination in airbag deployment algorithms |
| On-chip voltage regulator with HCAP monitoring | Enables operation from unregulated vehicle battery while detecting undervoltage faults before data corruption |
| Ground-loss detection via VGND/DIN pin | Identifies open-circuit chassis grounding in real time - critical for functional safety compliance (ISO 26262 ASIL-B) |
| 80-bit customer-programmable OTP memory | Stores calibration offsets, device configuration, and unique identifiers without requiring external EEPROM |
Applications
| Crash Detection (Airbag) | Impact Monitoring (Industrial) |
|---|---|
Use Scenario: Mounted in vehicle passenger compartment to detect rapid deceleration during frontal/side collisions. IC Role / Device Role / Timing Role: Z-axis accelerometer providing primary trigger signal for airbag inflation decision logic. Use Value: 40g range and overdamped Z-axis response ensure reliable detection of crash pulses ≥ 20g within 10 ms, meeting FMVSS 208 requirements. | Use Scenario: Installed on heavy machinery to log impact severity during transport or operation. IC Role / Device Role / Timing Role: Standalone shock event recorder interfaced to microcontroller via DSI bus. Use Value: DSI 2.0 daisy-chain capability allows multi-node deployment with single bus line, reducing wiring harness complexity. |
| Shock Detection (Railway) | Vibration Monitoring (Automotive) |
Use Scenario: Embedded in railcar couplers to detect coupling shocks exceeding safe thresholds. IC Role / Device Role / Timing Role: Z-axis sensor capturing transient acceleration peaks during mechanical engagement. Use Value: −40°C to +125°C rating and AEC-Q100 qualification ensure reliability in outdoor rail environments with wide thermal cycling. | Use Scenario: Mounted on engine mounts to monitor low-frequency vibration patterns indicating bearing wear. IC Role / Device Role / Timing Role: Analog signal source feeding CFIL pin to external ADC for spectral analysis. Use Value: Configurable 180 Hz Bessel filter suppresses high-frequency noise while preserving 0–100 Hz vibration signatures for predictive maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-axis accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA8110EG | Same 16-pin SOIC package and DSI 2.0 interface, but ±100g full-scale range and higher g-sensitivity threshold | Better suited for lower-magnitude vibration monitoring where 40g range may saturate | Select MMA8110EG when system dynamics require extended linear range beyond 40g without changing PCB layout |
| ADXL312ACPZ | I²C/SPI interface, 3-axis, 13-bit resolution, 1.8 V supply - no DSI or automotive qualification | Lacks ground-loss detection, AEC-Q100, and bus daisy-chaining; requires level-shifting for 6–30 V systems | Consider ADXL312ACPZ only for non-automotive, low-voltage, multi-axis prototyping where DSI infrastructure is unavailable |
Compared with MMA8104EG, MMA8110EG offers higher full-scale range in identical packaging and interface, enabling reuse of existing DSI bus architecture; ADXL312ACPZ provides higher resolution and multi-axis capability but requires complete redesign of power, interface, and safety validation for automotive use.
Availability
MMA8104EG is available at Aetrix Electronics and suitable for crash detection, impact monitoring, and shock detection applications requiring stable component supply across automotive production lifecycles.
Supply support for MMA8104EG 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
Freescale Semiconductor (now part of NXP Semiconductors) designs high-reliability sensors and microcontrollers for automotive, industrial, and aerospace applications.
The MMA81XXEG series was developed specifically for satellite accelerometer nodes in DSI 2.0 automotive networks, emphasizing functional safety, bus resilience, and integration with airbag control units.
FAQ
What is the exact full-scale range and axis orientation of the MMA8104EG?
The MMA8104EG is a Z-axis single-axis accelerometer with a calibrated full-scale range of ±40g. This is confirmed by the Type Byte (register $04) where AXIS = 0 and RNG2–RNG0 = 010 per Table 3-4 in the datasheet. Its mechanical sensitivity is oriented perpendicular to the top surface of the 16-pin SOIC package.
Does the MMA8104EG support daisy-chained DSI bus configurations?
Yes, the MMA8104EG fully supports daisy-chained DSI 2.0 bus configurations using BUSIN and BUSOUT pins. It also implements reverse initialization, allowing communication via BUSOUT if BUSIN becomes non-functional - a feature critical for fault-tolerant automotive satellite networks.
How does ground-loss detection work on the MMA8104EG, and how is it enabled?
Ground-loss detection on the MMA8104EG uses the VGND/DIN pin to source a constant current and measure resulting voltage. When DEVCFG2[5] (GLDE bit) is set to 1, the circuit monitors resistance between the pin and chassis ground; an open condition triggers a 14-bit counter, and overflow sets the Ground Fault (GF) flag. The pin must be directly connected to BUSRTN in differential-mode DSI operation.
What filter options are available on the MMA8104EG, and how are they selected?
The MMA8104EG offers two Bessel low-pass filter configurations: 180 Hz (2-pole) and 400 Hz (4-pole). Selection is controlled by the ORDER bit (bit 7) in the Type Byte (register $04): ORDER = 0 selects 400 Hz, ORDER = 1 selects 180 Hz. This setting is factory-programmed and read-only during normal operation.
Is the MMA8104EG qualified for automotive use, and what standards does it meet?
Yes, the MMA8104EG is qualified to AEC-Q100 Grade 1 (−40°C to +125°C) and is RoHS-compliant. It meets automotive functional safety requirements including integrated ground-loss detection, undervoltage monitoring, OTP parity checking, and fail-safe response behaviors documented in Section 2.4 of the datasheet.
MMA8104EG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Digital
- Axis:
- Z
- Acceleration Range:
- ±40g
- Sensitivity (LSB/g):
- 10
- 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
MMA8104EG FAQ
1.How can I place an order for MMA8104EG through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA8104EG 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 MMA8104EG reliable?
The price and inventory of MMA8104EG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA8104EG is usually 5 days.
3.What payment methods are accepted for MMA8104EG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA8104EG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA8104EG?
MMA8104EG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA8104EG 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 MMA8104EG?
For technical support, including MMA8104EG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA8104EG requirements.
6.How does Aetrix verify that MMA8104EG is sourced from the original manufacturer or authorized distributors?
All MMA8104EG 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 MMA8104EG meets industry standards.
7.What is the process for return or replacement of MMA8104EG?
All MMA8104EG units undergo pre-shipment inspection (PSI). If there is an issue with MMA8104EG, 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 MMA8104EG part is unused and in its original packaging.
Return procedure for MMA8104EG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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