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NXP Semiconductors MMA1618KGCWR2
- Part No.:
- MMA1618KGCWR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA1618KGCWR2.pdf
- Description:
- ACCELEROMETER 187G PCM 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,317
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Product details
Overview
MMA1618KGCWR2 from NXP Semiconductors is a Z-axis satellite accelerometer in the SafeAssure DSI2.5-compatible inertial sensor family, delivering ±187 g full-scale range, 180/400/800 Hz selectable low-pass filtering, and integrated high-side bus switch for daisy-chain configurations. It operates from -40 °C to +125 °C and is qualified to AEC-Q100 Grade 1 for automotive crash detection systems.
For engineers reviewing the MMA1618KGCWR2 datasheet, MMA1618KGCWR2 pinout, MMA1618KGCWR2 application, or MMA1618KGCWR2 equivalent, this page provides verified technical context, exact pin functions, real-world automotive use cases, and validated alternative parts for airbag control unit (ACU) design and DSI2.5 bus integration.
Technical Context
The MMA1618KGCWR2 implements an overdamped MEMS g-cell with natural frequency of 13.6–15.1 kHz and damping ratio of 2.04–7.58, enabling robust response to high-slew crash events without resonance artifacts. Its ΣΔ ADC with SINC filter and programmable 2- or 4-pole LPF supports deterministic latency (64–65/fOSC interpolation delay) and configurable noise-performance trade-offs across all five full-scale ranges.
DSI2.5 communication uses a single-wire bus with frame-based protocol, internal oscillator at 4 MHz ±5%, and mandatory command support including Initialization, Request ID, and Self-Test activation. The internal high-side bus switch enables daisy-chained topologies with controlled turn-on timing (89–138 μs after initialization) and leakage-limited isolation (<20 μA when open).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±187 g - calibrated output sensitivity of 2.731 LSB/g in 10-bit mode, enabling precise discrimination of moderate-to-severe crash acceleration profiles. |
| Low-Pass Filter Options | 180 Hz (2-pole), 400 Hz (4-pole), or 800 Hz (4-pole) - selectable via OTP to match vehicle-specific crash pulse bandwidth while suppressing road noise. |
| Operating Temperature | -40 °C to +125 °C - qualified per AEC-Q100 Grade 1, ensuring stable offset, sensitivity, and self-test response across under-hood and cabin mounting locations. |
| DSI2.5 Bus Interface | Single-wire, 100–200 kbps data rate, frame-based protocol with CRC-protected commands - eliminates need for separate clock or address lines in multi-sensor ACUs. |
| Internal Oscillator | 4.0 MHz ±5% - provides timing reference for ADC sampling (16 μs native rate), interpolation to 1 ms output, and DSI frame synchronization without external crystal. |
| Supply Architecture | Bus-powered via BUSIN (6.3–30 V), with HCAP hold capacitor and dual regulated supplies (VREG = 2.5 V ±3%, VREGA = 2.5 V ±3%) - simplifies power design in battery-voltage environments. |
| Self-Test Deflection | 205 LSB typical at TA = 25 °C (±10% over temp) - enables in-system functional verification of signal chain integrity without mechanical stimulus. |
Pinout & Package
Pb-free 16-pin QFN package, 6 mm × 6 mm × 1.98 mm, with exposed die attach pad connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 TEST2 | Test Pin | Must be left unconnected in production; no functional role in normal operation or DSI communication. |
| 2 TEST3 | Test Pin | Must be grounded; used internally during factory test, not accessible or active in application mode. |
| 3 TEST1 | Test Pin | Must be grounded; provides no user-accessible function and must not float or be driven. |
| 4 BUSRTN | Common Return | Shared ground return for BUSIN/BUSOUT power and signaling; requires low-impedance connection to system chassis or main GND plane. |
| 5 PCM | PCM Output | 4 MHz pulse-code modulated acceleration data output; enabled via OTP bit DEVCFG2[5]; if unused, must be left unconnected. |
| 6 BUSOUT | DSI Bus Output | Internally switched connection to BUSIN; closed only after Initialization command; drives next slave's BUSIN in daisy chain. |
| 7 BUSIN | DSI Bus Input/Supply | Primary power input (6.3–30 V) and bidirectional DSI communication node; requires 100–1500 pF decoupling capacitor to BUSRTN. |
| 8 HCAP | Hold Capacitor Node | Rectified BUSIN supply rail; stores energy for uninterrupted operation during master signaling; requires external 1–100 μF reservoir capacitor. |
| 9 CREG | Digital Supply | Output of internal digital regulator (2.5 V); powers logic and interface; requires 500–1500 nF ceramic capacitor to VSS. |
| 10 TEST4 | Test Pin | Must be grounded; no user-accessible functionality; floating or driven state may cause undefined behavior. |
| 11 CREGA | Analog Supply | Output of internal analog regulator (2.5 V); powers sensing element and ADC; requires 500–1500 nF ceramic capacitor to VSSA. |
| 12 VSSA | Analog Ground | Dedicated return for analog circuitry; must be isolated from digital ground at PCB level except at single-point star connection. |
| 13 TEST5 | Test Mode Enable | Must be grounded in application; asserts test mode and SPI programming voltage when pulled high - not for runtime use. |
| 14 TEST6 | Test Pin | Must be grounded; no operational role; violation risks invalid device state or POR failure. |
| 15 TEST7 | Test Pin | Must be grounded; reserved for factory characterization; not connected in final product layout. |
| 16 VSS | Digital Ground | Dedicated return for digital circuitry; connects to exposed pad; must tie to system GND with multiple vias for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| DSI2.5 Daisy Chain Support | Integrated high-side bus switch enables up to 8-node daisy chains without external transceivers or level shifters, reducing BOM count and routing complexity in multi-sensor ACUs. |
| Overdamped Z-Axis Sensing | g-cell damping ratio ≥2.04 ensures monotonic step response with <200 μs delay at 100 Hz, eliminating ringing artifacts critical for accurate crash pulse timing. |
| AEC-Q100 Grade 1 Qualification | Validated for -40 °C to +125 °C operation with full electrical testing at temperature extremes, supporting placement in engine bay, pillar, or seat-mounted airbag modules. |
| Programmable Low-Pass Filtering | Three factory-selectable LPF options (180/400/800 Hz) allow tuning to vehicle-specific crash signatures while maintaining >70 dB stopband attenuation. |
| Self-Test with Quantified Deflection | On-command electrostatic actuation yields 205 LSB typical deflection (±20% over temp), enabling automated production and field diagnostics without mechanical fixtures. |
| Bus-Powered Operation | Accepts 6.3–30 V on BUSIN with internal rectification and dual regulated supplies - eliminates need for external DC/DC or LDO in 12 V/24 V automotive systems. |
Applications
| Frontal Crash Detection | Side-Impact Detection |
|---|---|
|
Use Scenario: Mounted in vehicle dashboard or radiator support to detect rapid deceleration during head-on collisions. IC Role / Device Role / Timing Role: Z-axis accelerometer providing time-aligned acceleration data to airbag control unit (ACU) for deployment decision within ≤30 ms of impact onset. Use Value: ±187 g range and 180 Hz LPF capture full crash pulse envelope while rejecting high-frequency suspension noise, enabling reliable deployment thresholding. |
Use Scenario: Integrated into door module or B-pillar to sense lateral acceleration during T-bone or side-swipe impacts. IC Role / Device Role / Timing Role: Single-axis inertial sensor feeding real-time Z-axis (vertical) acceleration data to ACU for side-curtain and torso airbag triggering. Use Value: Overdamped g-cell response (<200 μs delay) ensures accurate timing of peak acceleration for synchronized airbag inflation with occupant kinematics. |
| Seat-Mounted Occupant Sensing | Electronic Stability Control Backup |
|
Use Scenario: Embedded in driver or passenger seat structure to monitor vertical acceleration during braking or pothole events. IC Role / Device Role / Timing Role: Z-axis motion detector supplying supplemental occupancy and posture data to restraint control algorithms. Use Value: AEC-Q100 qualification and -40 °C to +125 °C operation ensure reliability in thermally aggressive seat environments with minimal calibration drift. |
Use Scenario: Installed in vehicle center console as redundant acceleration source for ESC systems during CAN bus failure. IC Role / Device Role / Timing Role: Standby inertial sensor providing independent Z-axis acceleration measurement to ESC microcontroller via DSI2.5 bus. Use Value: DSI2.5 single-wire interface allows fail-operational backup channel with <1 ms interpolation latency and deterministic frame timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inertial sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA1612KGCWR2 | ±125 g full-scale range; 4.096 LSB/g sensitivity; lower overload margin (±1205 g negative clip vs. ±3100 g for MMA1618KGCWR2) | Optimized for lower-energy frontal crashes where 125 g suffices; reduced dynamic range limits suitability for high-speed collision scenarios. | Select when cost-sensitive designs require adequate margin for Euro NCAP 56 km/h barrier tests but not US IIHS 64 km/h small overlap. |
| MMA1631KGCWR2 | ±312 g full-scale range; 1.638 LSB/g sensitivity; higher clipping thresholds (±2210 g negative, ±2800 g positive) | Targeted at heavy-duty vehicles and rollover detection where extreme Z-axis transients occur; lower sensitivity increases quantization noise in low-g regimes. | Choose for commercial truck ACUs or rollover sensing where peak acceleration exceeds 200 g and system SNR budget permits coarser resolution. |
Compared with MMA1612KGCWR2 and MMA1631KGCWR2, the MMA1618KGCWR2 delivers optimal balance of range (±187 g), sensitivity (2.731 LSB/g), and overload capability (−3100 g to +2800 g) for mainstream passenger car frontal and side-impact detection without overspecifying cost or noise floor.
Availability
MMA1618KGCWR2 is available at Aetrix Electronics and suitable for automotive airbag control units, electronic stability control backup systems, and seat-mounted occupant sensing modules requiring stable component supply across extended production lifecycles.
Supply support for MMA1618KGCWR2 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, with deep expertise in sensor signal conditioning and functional safety.
The MMA16xx family was designed specifically for ASIL-B compliant automotive safety systems, emphasizing DSI2.5 bus robustness, AEC-Q100 qualification, and integrated self-test for airbag and restraint control applications.
FAQ
What is the full-scale range and sensitivity of the MMA1618KGCWR2?
The MMA1618KGCWR2 has a nominal full-scale range of ±187 g and a sensitivity of 2.731 LSB/g in 10-bit output mode. This value is factory-trimmed and stored in OTP; actual sensitivity remains stable across its −40 °C to +125 °C operating range, with total sensitivity error limited to ±7% over temperature.
How does the DSI2.5 daisy-chain functionality work on the MMA1618KGCWR2?
The MMA1618KGCWR2 integrates a high-side bus switch between BUSIN and BUSOUT. After receiving an Initialization command, the switch closes, allowing the device to pass DSI frames to the next slave. The switch opens automatically on reset and remains open until initialization, enabling reliable multi-node bus topology without external switches or repeaters.
Is the MMA1618KGCWR2 qualified for automotive use, and what standards does it meet?
Yes, the MMA1618KGCWR2 is qualified to AEC-Q100 Revision G, Grade 1 (−40 °C to +125 °C), with full production testing at temperature extremes. It also meets ISO 26262 readiness requirements for ASIL-B systems and includes built-in self-test, OTP CRC error detection, and fault-reporting via DSI status flags.
What are the required external components for stable operation of the MMA1618KGCWR2?
Stable operation requires: (1) 100–1500 pF ceramic capacitor between BUSIN and BUSRTN; (2) 1–100 μF reservoir capacitor between HCAP and BUSRTN; (3) 500–1500 nF ceramic capacitors from CREG to VSS and CREGA to VSSA; and (4) proper grounding of all TEST pins per datasheet Table 2.
Can the MMA1618KGCWR2 be used outside of automotive crash detection applications?
While optimized for automotive airbag systems, the MMA1618KGCWR2 can be applied in any high-reliability Z-axis inertial sensing scenario requiring wide temperature range, bus-powered operation, and deterministic latency - such as industrial vibration monitoring in engine compartments or railway crash event recorders - provided DSI2.5 interface compatibility is maintained.
MMA1618KGCWR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- MMA
- Package/Case:
- 16-QFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Digital
- Axis:
- Z
- Acceleration Range:
- ±187g
- Sensitivity (LSB/g):
- 2.731
- Sensitivity (mV/g):
- -
- Bandwidth:
- -
- Output Type:
- PCM
- Voltage - Supply:
- 6.3V ~ 30V
- 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-EP (6x6)
MMA1618KGCWR2 FAQ
1.How can I place an order for MMA1618KGCWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA1618KGCWR2 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 MMA1618KGCWR2 reliable?
The price and inventory of MMA1618KGCWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA1618KGCWR2 is usually 5 days.
3.What payment methods are accepted for MMA1618KGCWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA1618KGCWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA1618KGCWR2?
MMA1618KGCWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA1618KGCWR2 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 MMA1618KGCWR2?
For technical support, including MMA1618KGCWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA1618KGCWR2 requirements.
6.How does Aetrix verify that MMA1618KGCWR2 is sourced from the original manufacturer or authorized distributors?
All MMA1618KGCWR2 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 MMA1618KGCWR2 meets industry standards.
7.What is the process for return or replacement of MMA1618KGCWR2?
All MMA1618KGCWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MMA1618KGCWR2, 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 MMA1618KGCWR2 part is unused and in its original packaging.
Return procedure for MMA1618KGCWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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