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NXP Semiconductors MMA7361LR1
- Part No.:
- MMA7361LR1
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 14-TFLGA
- Datasheet:
-
MMA7361LR1.pdf
- Description:
- ACCEL 1.5-6G ANALOG 14LGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,925
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Product details
Overview
MMA7361LR1 from Freescale Semiconductor is a 3-axis capacitive micromachined accelerometer with integrated signal conditioning, selectable ±1.5g/±6g ranges, 0g-detect for freefall protection, self-test capability, and ultra-low-power sleep mode (3 μA). It delivers ratiometric analog outputs (XOUT/YOUT/ZOUT), operates from 2.2 V to 3.6 V, and is used in HDD freefall detection, laptop anti-theft, and motion-enabled mobile interfaces.
For engineers reviewing the MMA7361LR1 datasheet, MMA7361LR1 pinout, MMA7361LR1 application, or MMA7361LR1 equivalent, key selection criteria include g-range switching via g-Select pin, 0g-Detect logic output timing, Sleep Mode enable response time (0.5 ms), and temperature-compensated offset stability across –40°C to +85°C.
Technical Context
The MMA7361LR1 integrates a surface-micromachined polysilicon g-cell sensor with an ASIC featuring switched-capacitor readout, on-chip 1-pole low-pass filtering, and NVM-trimmed calibration. Its ratiometric analog outputs scale linearly with VDD, enabling direct interfacing with microcontroller ADCs without external reference voltage.
It implements dedicated digital control logic for Sleep Mode activation (pin 7), g-Select range switching (pin 10), Self Test initiation (pin 13), and 0g-Detect assertion (pin 9) - all operating independently of the analog signal path and validated over full industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Acceleration Range | ±1.5g or ±6g, selected by logic level on g-Select pin (pin 10) |
| Sensitivity | 800 mV/g @ ±1.5g mode; 206 mV/g @ ±6g mode - defines minimum resolvable acceleration step at given VDD |
| Supply Voltage | 2.2 V – 3.6 V - supports single-cell Li-ion and dual-cell alkaline battery systems without regulation |
| Supply Current | 400 μA typical active; 3 μA typical sleep - enables multi-month operation in portable devices |
| Bandwidth (XY) | 400 Hz - sufficient for human-motion detection (e.g., pedometer, tilt UI) without aliasing |
| 0g-Detect Output | Digital logic high when |X|, |Y|, |Z| < 0.4g - directly drives MCU interrupt pins for freefall event capture |
| Self Test Response | ΔgSTXY = +0.05g to +0.8g; ΔgSTZ = –0.1g to +1.0g - verifies mechanical integrity and signal chain end-to-end |
Pinout & Package
Package: 14-lead LGA (3 mm × 5 mm × 1.0 mm, Case 1977-01), RoHS-compliant, surface-mountable with solder-mask-defined footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8, 11, 12, 14 | No internal connection | Must remain unconnected; no pull-up/down or routing required |
| 2 (XOUT) | Analog output - X-axis acceleration | Ratiometric voltage (VDD/2 ± sensitivity × g); requires 3.3 nF capacitor to suppress clock noise |
| 3 (YOUT) | Analog output - Y-axis acceleration | Same ratiometric behavior as XOUT; independent axis with cross-axis sensitivity ≤ ±5% |
| 4 (ZOUT) | Analog output - Z-axis acceleration | Same ratiometric behavior; calibrated zero-g offset drift ≤ ±2 mg/°C |
| 5 (VSS) | Ground reference | Must connect to clean, low-impedance ground plane beneath package per layout guidelines |
| 6 (VDD) | Power supply input | Requires 0.1 μF ceramic decoupling capacitor placed adjacent to pin |
| 7 (Sleep) | Digital input - Sleep Mode control | Low = sleep (3 μA); high = active (400 μA); response time 0.5 ms |
| 9 (0g-Detect) | Digital output - freefall status | Open-drain logic high when all axes near zero-g; sinks current into MCU interrupt pin |
| 10 (g-Select) | Digital input - range selection | Low = ±1.5g (800 mV/g); high = ±6g (206 mV/g); internal pull-down defaults to 1.5g |
| 13 (Self Test) | Digital input - test activation | Pulse high to initiate electrostatic deflection; validates g-cell and signal chain simultaneously |
Key Features
| Feature | Design Value |
|---|---|
| 0g-Detect logic output | Enables immediate system-level freefall response without software polling or ADC thresholding |
| Selectable sensitivity (±1.5g / ±6g) | Allows one hardware design to serve both precision motion UI (1.5g) and shock detection (6g) use cases |
| Sleep Mode (3 μA) | Reduces average power in intermittent-sampling applications (e.g., pedometer step detection) by >99% |
| Ratiometric analog outputs | Eliminates need for external voltage reference; cancels supply-induced errors in ADC conversion |
| On-chip temperature compensation | Maintains zero-g offset drift ≤ ±2 mg/°C and sensitivity drift ≤ ±0.0075%/°C over full range |
Applications
| Laptop Freefall Protection | HDD MP3 Player Shock Detection |
|---|---|
Use Scenario: Sudden drop of notebook PC detected before impact to park HDD heads. IC Role / Device Role / Timing Role: MMA7361LR1 monitors real-time Z-axis acceleration; asserts 0g-Detect within 2 ms of onset of freefall. Use Value: Prevents head crash and data loss by triggering head retraction before contact with surface. |
Use Scenario: Portable music player subjected to accidental drop during playback. IC Role / Device Role / Timing Role: MMA7361LR1 detects ≥100 ms of near-zero-g condition across all axes and signals controller to suspend write operations. Use Value: Avoids file corruption and NAND flash wear during mechanical shock events. |
| Mobile Phone Motion UI | Pedometer Step Counting |
Use Scenario: User tilts phone to scroll text or rotate game view. IC Role / Device Role / Timing Role: MMA7361LR1 provides continuous analog X/Y/Z outputs sampled at ≥100 Hz by host MCU ADC. Use Value: Enables low-latency, jitter-free orientation tracking with <1° tilt resolution at ±1.5g range. |
Use Scenario: Wearable device detecting vertical acceleration peaks during walking/running. IC Role / Device Role / Timing Role: MMA7361LR1 operates in ±1.5g mode with Sleep Mode cycled between steps to minimize power. Use Value: Achieves >12-month battery life in coin-cell-powered pedometers using 400 μA active / 3 μA sleep current profile. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-axis analog-output accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADXL335 | Wider supply range (1.8–3.6 V); higher noise floor (300 μg/√Hz vs. 350 μg/√Hz); no 0g-Detect or Sleep Mode | Lacks integrated freefall detection and ultra-low-power sleep - requires external logic/MCU polling | Choose ADXL335 only if wider VDD range or legacy compatibility outweighs missing 0g-Detect and sleep functionality |
| KXSC7-2050 | Lower power (2.5 μA sleep); digital I²C output; built-in FIFO; no analog outputs or g-Select pin | Requires I²C interface and firmware parsing; not drop-in for analog ADC designs | Prefer KXSC7-2050 when system already uses digital sensors and needs FIFO buffering for burst motion capture |
Compared with ADXL335 and KXSC7-2050, the MMA7361LR1 uniquely combines analog ratiometric outputs, hardware 0g-Detect, and sub-μA sleep in a single LGA-14 package - making it optimal for cost-sensitive, battery-constrained systems requiring immediate freefall response without MCU intervention.
Availability
MMA7361LR1 is available at Aetrix Electronics and suitable for laptop anti-theft, HDD freefall protection, and motion-based mobile UI requiring stable component supply and long-term industrial temperature support (–40°C to +85°C).
Supply support for MMA7361LR1 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) is a fabless semiconductor company specializing in embedded processing, sensors, and connectivity solutions for automotive, industrial, and consumer markets.
The MMA7361LR1 belongs to Freescale's MEMS accelerometer product line, designed specifically for ultra-low-power, cost-sensitive motion sensing in portable electronics where analog simplicity and hardware-triggered events (e.g., 0g-Detect) are critical.
FAQ
What is the function of the g-Select pin on the MMA7361LR1?
The g-Select pin (pin 10) configures the MMA7361LR1's full-scale range: logic low selects ±1.5g (800 mV/g), and logic high selects ±6g (206 mV/g). The MMA7361LR1 includes an internal pull-down resistor, so leaving g-Select unconnected defaults to ±1.5g mode. This allows dynamic range switching during operation without recalibration.
How does the 0g-Detect feature work in the MMA7361LR1?
The MMA7361LR1 asserts its 0g-Detect pin (pin 9) high when the magnitude of acceleration on all three axes falls below ±0.4g - indicating linear freefall. This open-drain output can directly drive an MCU interrupt pin, enabling hardware-triggered head parking or data suspension without continuous ADC sampling or software threshold checks.
What is the recommended external capacitance for MMA7361LR1 analog outputs?
A 3.3 nF capacitor must be placed on each analog output (XOUT, YOUT, ZOUT) of the MMA7361LR1 to filter internal clock noise from the switched-capacitor filter. This sets the output bandwidth to ~1507 Hz, which exceeds the specified 400 Hz XY bandwidth while suppressing switching artifacts that would otherwise corrupt ADC readings.
Can the MMA7361LR1 operate from a 1.8 V supply?
No - the MMA7361LR1 requires a minimum supply voltage of 2.2 V and maximum of 3.6 V. Operation below 2.2 V is outside specification and may result in undefined output behavior, increased offset drift, or failure to assert 0g-Detect. For 1.8 V systems, consider alternative accelerometers such as the LIS3DH or FXLN83xx series.
What is the purpose of the Self Test pin on the MMA7361LR1?
The Self Test pin (pin 13) initiates an internal electrostatic force that deflects the MEMS sensing element, producing known acceleration steps (e.g., +0.05g to +0.8g on XY, –0.1g to +1.0g on Z). This validates both mechanical integrity and analog signal chain functionality - critical for field-replaceable HDD protection modules and post-soldering verification.
MMA7361LR1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 14-TFLGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Analog
- Axis:
- X, Y, Z
- Acceleration Range:
- ±1.5g, 6g
- Sensitivity (LSB/g):
- -
- Sensitivity (mV/g):
- 800 (±1.5g) ~ 206 (±6g)
- Bandwidth:
- 400Hz (X,Y), 300Hz (Z)
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 2.2V ~ 3.6V
- Features:
- Selectable Scale, Sleep Mode
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-LGA (3x5)
MMA7361LR1 FAQ
1.How can I place an order for MMA7361LR1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA7361LR1 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 MMA7361LR1 reliable?
The price and inventory of MMA7361LR1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA7361LR1 is usually 5 days.
3.What payment methods are accepted for MMA7361LR1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA7361LR1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA7361LR1?
MMA7361LR1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA7361LR1 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 MMA7361LR1?
For technical support, including MMA7361LR1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA7361LR1 requirements.
6.How does Aetrix verify that MMA7361LR1 is sourced from the original manufacturer or authorized distributors?
All MMA7361LR1 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 MMA7361LR1 meets industry standards.
7.What is the process for return or replacement of MMA7361LR1?
All MMA7361LR1 units undergo pre-shipment inspection (PSI). If there is an issue with MMA7361LR1, 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 MMA7361LR1 part is unused and in its original packaging.
Return procedure for MMA7361LR1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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