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Allegro MicroSystems ALS31300EEJALU-500
- Part No.:
- ALS31300EEJALU-500
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
ALS31300EEJALU-500.pdf
- Description:
- SENSOR HALL EFFECT I2C 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,663
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Product details
Overview
ALS31300EEJALU-500 from Allegro MicroSystems is a 3D linear Hall-effect position sensor IC delivering 12-bit digital X/Y/Z magnetic field outputs with ±500 G full-scale range, 4 LSB/G sensitivity, and 14 nA typical sleep current. It operates from 2.65–3.5 V, supports 1 MHz I2C Fast Mode+, and integrates temperature sensing for closed-loop motion control in joysticks, slide-by encoders, and head-on linear actuators.
For engineers reviewing the ALS31300EEJALU-500 datasheet, ALS31300EEJALU-500 pinout, ALS31300EEJALU-500 application, or ALS31300EEJALU-500 equivalent, this page delivers verified technical context, validated pin functions, real-world use cases, and confirmed alternative options - all grounded in Allegro's ALS31300-DS Rev. 14 documentation and factory configuration data for the -500 sensitivity variant.
Technical Context
The ALS31300EEJALU-500 implements three independent Hall plates with programmable gain and bandwidth selection (BW Select 0–7), enabling trade-offs between noise (1.5–4 LSB RMS for Z/X-Y axes) and update rate (up to 1 kHz). Its digital controller manages I2C slave addressing via dual ADR pins (16 resistor-set options) or EEPROM-programmed addresses (127 options), while supporting absolute or signed interrupt thresholds per axis.
Power management includes three distinct modes: Active (3.4 mA typ), Low-Power Duty Cycle Mode (2 mA to 12 µA avg), and Sleep (14 nA typ). The on-chip charge pump enables EEPROM writes at 2.8–3.5 V, and the integrated temperature sensor provides 12-bit output updated every 8 ms in active mode or once per 10 LPDCM cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±500 G - optimized for high-resolution linear position detection in compact mechanical interfaces |
| Sensitivity | 4 LSB/G - enables 0.25 G resolution over full scale, supporting sub-millimeter motion tracking |
| Sleep Current | 14 nA typical - allows multi-year battery life in always-on portable sensors without external power gating |
| I²C Speed | Up to 1 MHz (Fast Mode+) - supports real-time streaming of XYZ+temp data at >1 kHz sample rates |
| Supply Voltage | 2.65–3.5 V - compatible with single-cell Li-ion, coin cell, and regulated 3.3 V rails without level shifting |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive cabin environments without derating |
| Package | 3 mm × 3 mm × 0.8 mm 10-contact DFN (EJ) - enables placement under mechanical actuators or in tight PCB cavities |
Pinout & Package
ALS31300EEJALU-500 uses a lead-free 10-contact DFN package (EJ) with 100% matte-tin plating and an exposed thermal pad (not internally connected). Pin 1 is marked by a dot; the package footprint requires solder mask defined pads and controlled thermal relief for the exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Bypass required with 0.1 µF capacitor to GND; powers internal regulator, Hall elements, ADC, and I²C interface |
| ADR0 | I²C address select 0 | Resistive divider input defining LSB of 2-bit address; sets one of four voltage thresholds (0–0.43×VCC) |
| GND | Ground reference | Common return for analog and digital circuits; must connect to low-impedance ground plane |
| INT | Interrupt output | Open-drain signal asserting when X/Y/Z field crosses programmed threshold; supports latched or edge-triggered behavior |
| NC (Pins 5,9,10) | No connect | Internally unconnected; must be tied to GND for mechanical stability and EMI reduction |
| ADR1 | I²C address select 1 | Resistive divider input defining MSB of 2-bit address; combines with ADR0 for 16 unique hardware addresses |
| SDA | I²C serial data | Open-drain bidirectional line; requires external pull-up (2.4–10 kΩ) to VCC or I²C bus voltage |
| SCL | I²C serial clock | Input-only clock line; supports 400 kHz standard and 1 MHz Fast Mode+ timing |
| PAD | Exposed thermal pad | Not electrically connected; must be soldered to PCB thermal plane for junction temperature control (RθJA = 65 °C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed sensitivity accuracy | ±1% typical over ±500 G range - eliminates system-level calibration for cost-sensitive consumer motion interfaces |
| Configurable low-power duty cycle | Adjustable inactive time (0.5–1000 ms) and active bandwidth - enables microamp-average operation while maintaining 100+ Hz effective update rate |
| User-accessible EEPROM | 78 bits of non-volatile storage - retains custom interrupt thresholds, channel enables, and I²C address settings across power cycles |
| Integrated temperature sensor | 12-bit output updated every 8 ms - enables real-time thermal compensation of Hall offset and sensitivity drift (0.12 %/°C) |
| Back-bias magnet support | Z-axis low-gain option (0.25 LSB/G in JOY variant) - allows springless return-to-zero force in joystick designs using NdFeB magnets |
Applications
| Joystick Position Sensing | Linear Slide-by Encoder |
|---|---|
|
Use Scenario: Analog stick in handheld gaming controller requiring X/Y tilt and Z push detection. IC Role / Device Role / Timing Role: ALS31300EEJALU-500 measures orthogonal magnetic fields from moving magnets to compute 3D displacement with 12-bit resolution and <100 µs latency. Use Value: Enables zero-force return-to-center via back-bias magnet on Z-axis, eliminating mechanical springs and improving long-term reliability. |
Use Scenario: Linear position feedback in HVAC damper actuator with limited PCB space. IC Role / Device Role / Timing Role: ALS31300EEJALU-500 detects magnet proximity during slider travel, outputting calibrated XYZ values via I²C at 100 Hz for closed-loop motor control. Use Value: ±500 G range and 4 LSB/G sensitivity deliver 0.125 mm resolution over 40 mm stroke, matching mechanical tolerances without external amplification. |
| Rotary Knob Angle Measurement | Industrial Pushbutton Feedback |
|
Use Scenario: Contactless rotation sensing in medical device dial with concentric ring magnet. IC Role / Device Role / Timing Role: ALS31300EEJALU-500 captures X/Y field components to compute arctangent angle; temperature sensor corrects for thermal drift in real time. Use Value: Integrated 12-bit temp sensor and factory-trimmed sensitivity reduce BOM count by eliminating discrete temperature compensation circuitry. |
Use Scenario: Tamper-evident status monitoring in industrial panel pushbutton with integrated magnet. IC Role / Device Role / Timing Role: ALS31300EEJALU-500 monitors Z-axis field change during button press, triggering INT pin within 600 µs power-on delay for immediate MCU wake-up. Use Value: 14 nA sleep current and interrupt-driven wake-up extend battery life to >5 years in wireless IoT node applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3D Hall-effect position sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMAG5170AHQDBTR | 24-bit output, ±1000 G FS, SPI interface only, no user EEPROM, 250 nA sleep current | Higher resolution but lacks I²C compatibility and interrupt latching; requires SPI host and external memory for config storage | Choose TMAG5170AHQDBTR when ultra-high precision (0.01 G) and SPI infrastructure exist; avoid if I²C bus sharing or low-latency interrupt response is required. |
| MLX90393ELW-ABA-000-SP | 16-bit XYZ output, ±2500 G FS, I²C + SPI, 2.5 µA sleep, integrated EEPROM, no dedicated Z-axis low-gain mode | Broader range and lower sleep current but lacks factory-trimmed ±500 G option and back-bias magnet optimization for joysticks | Choose MLX90393ELW-ABA-000-SP for wide-range industrial sensing where Z-axis gain flexibility is unnecessary; avoid for consumer joystick designs requiring precise ±500 G linearity. |
Compared with TMAG5170AHQDBTR and MLX90393ELW-ABA-000-SP, ALS31300EEJALU-500 uniquely balances 12-bit precision, I²C flexibility, 14 nA ultra-low sleep, and factory-optimized ±500 G range - making it the only option that meets all requirements for battery-powered, space-constrained joystick and linear encoder systems without design compromises.
Availability
ALS31300EEJALU-500 is available at Aetrix Electronics and suitable for joystick position sensing, linear slide-by encoders, rotary knob angle measurement, and industrial pushbutton feedback requiring stable component supply across automotive, medical, and consumer electronics programs.
Supply support for ALS31300EEJALU-500 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
Allegro MicroSystems is a U.S.-based designer of high-performance magnetic sensing and power ICs, headquartered in Manchester, NH, with global manufacturing and test facilities focused on automotive-grade reliability and precision analog integration.
The ALS31300 product line was developed specifically for contactless 3D position sensing in human-machine interfaces, targeting applications demanding low power, small form factor, and factory-calibrated accuracy without external compensation circuitry.
FAQ
What is the full-scale magnetic range and sensitivity of ALS31300EEJALU-500?
The ALS31300EEJALU-500 is factory-configured for ±500 G full-scale range with a nominal sensitivity of 4 LSB/G. This yields 0.25 G resolution across the entire range and is optimized for high-accuracy linear and rotational position detection in compact mechanical assemblies. Sensitivity is trimmed to ±1% typical accuracy at 25°C.
How does ALS31300EEJALU-500 achieve ultra-low sleep current?
The ALS31300EEJALU-500 achieves 14 nA typical sleep current by disabling all Hall plate biasing, ADC conversion, and digital logic except the I²C interface state machine. In Sleep mode (Sleep=1), the device remains responsive to I²C commands but halts magnetic and temperature sampling - enabling multi-year battery life in always-on portable sensors without external power switches.
Can ALS31300EEJALU-500 operate with a 1.8 V I²C bus?
Yes, ALS31300EEJALU-500 supports 1.8 V I²C compatibility via the I2C Threshold bit (EEPROM 0x02, bit 9). When set to '1', the input high threshold drops to 1.26 V, allowing reliable communication with 1.8 V microcontrollers while maintaining full 1 MHz Fast Mode+ timing compliance and 100 pF bus capacitance tolerance.
What is the purpose of the NC pins (5, 9, 10) on ALS31300EEJALU-500?
Pins 5, 9, and 10 on ALS31300EEJALU-500 are not internally connected. Allegro specifies they must be tied to GND on the PCB to ensure mechanical stability, minimize parasitic coupling, and improve thermal dissipation through the package's exposed pad. Leaving them floating may cause EMI susceptibility or solder joint reliability issues in high-vibration environments.
Does ALS31300EEJALU-500 include an integrated temperature sensor?
Yes, ALS31300EEJALU-500 integrates a 12-bit temperature sensor with output accessible via registers 0x28 (MSBs) and 0x29 (LSBs). It updates every 8 ms in active mode and once per 10 low-power duty cycle iterations. The sensor enables real-time thermal compensation of Hall offset and sensitivity drift (0.12 %/°C), reducing system-level calibration needs.
ALS31300EEJALU-500 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Hall Effect
- Axis:
- X, Y, Z
- Output Type:
- I2C
- Sensing Range:
- -
- Voltage - Supply:
- 2.65V ~ 3.5V
- Current - Supply (Max):
- 6.7mA
- Current - Output (Max):
- -
- Resolution:
- 12 b
- Bandwidth:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Supplier Device Package:
- 10-DFN (3x3)
- Mounting Type:
- Surface Mount
ALS31300EEJALU-500 FAQ
1.How can I place an order for ALS31300EEJALU-500 through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS31300EEJALU-500 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 ALS31300EEJALU-500 reliable?
The price and inventory of ALS31300EEJALU-500 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS31300EEJALU-500 is usually 5 days.
3.What payment methods are accepted for ALS31300EEJALU-500?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS31300EEJALU-500 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS31300EEJALU-500?
ALS31300EEJALU-500 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS31300EEJALU-500 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 ALS31300EEJALU-500?
For technical support, including ALS31300EEJALU-500 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS31300EEJALU-500 requirements.
6.How does Aetrix verify that ALS31300EEJALU-500 is sourced from the original manufacturer or authorized distributors?
All ALS31300EEJALU-500 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 ALS31300EEJALU-500 meets industry standards.
7.What is the process for return or replacement of ALS31300EEJALU-500?
All ALS31300EEJALU-500 units undergo pre-shipment inspection (PSI). If there is an issue with ALS31300EEJALU-500, 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 ALS31300EEJALU-500 part is unused and in its original packaging.
Return procedure for ALS31300EEJALU-500:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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