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Allegro MicroSystems ALS31300EEJALU-JOY
- Part No.:
- ALS31300EEJALU-JOY
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
ALS31300EEJALU-JOY.pdf
- Description:
- SENSOR HALL EFFECT I2C 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,386
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Product details
Overview
ALS31300EEJALU-JOY from Allegro MicroSystems is a 3D linear Hall-effect position sensor IC delivering 12-bit I²C digital outputs for X, Y, and Z magnetic field axes. It is factory-configured for joystick mode with reduced Z-axis sensitivity (0.25 LSB/G) to support back-bias magnet return-to-zero functionality in mechanical input systems. Key confirmed specs: ±2000 G full-scale on X/Y, ±8000 G on Z, 14 nA typical sleep current, 2.65–3.5 V supply, and 10-contact 3 mm × 3 mm DFN (EJ) package.
For engineers reviewing the ALS31300EEJALU-JOY datasheet, ALS31300EEJALU-JOY pinout, ALS31300EEJALU-JOY application, or ALS31300EEJALU-JOY equivalent, this page delivers verified technical context for joystick position sensing, low-power portable HMI design, I²C bus integration with multi-device addressing, and magnetic sensing system calibration using on-chip EEPROM and temperature compensation.
Technical Context
The ALS31300EEJALU-JOY implements three independent Hall plates with configurable gain per axis-X/Y at 1 LSB/G and Z at 0.25 LSB/G-enabling asymmetric field response optimized for push-and-rotate joystick motion. Its 12-bit ADC provides 10-bit ENOB and supports bandwidth-selectable filtering (BW Select 0–7) to trade resolution for update rate in LPDCM.
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 device integrates a 12-bit temperature sensor updated every 8 ms, and uses an on-chip charge pump for EEPROM programming without external high-voltage sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.65–3.5 V - Enables direct interface with common microcontroller I/O rails and battery-powered systems without LDO overhead. |
| Sleep Current | 14 nA (typ) - Allows multi-year operation in always-on portable devices such as gaming controllers or medical input peripherals. |
| X/Y Sensitivity | 1 LSB/G - Delivers ±2000 G full-scale range with 0.5 G effective resolution for precise linear slide-by or head-on motion detection. |
| Z Sensitivity | 0.25 LSB/G - Extends Z-axis range to ±8000 G to accommodate strong back-bias magnets while maintaining return-to-zero linearity. |
| I²C Addressing | 127 EEPROM-programmable addresses - Supports dense multi-sensor nodes on shared buses without hardware address conflicts. |
| User EEPROM | 78 bits - Stores calibrated offsets, interrupt thresholds, or system-specific configuration without external memory. |
| Operating Temp | –40°C to +85°C - Validated for industrial-grade human interface modules deployed in uncontrolled ambient environments. |
Pinout & Package
ALS31300EEJALU-JOY is housed in a lead-free 10-contact DFN package (3 mm × 3 mm × 0.8 mm, EJ variant) with 100% matte-tin leadframe plating and exposed thermal pad (not internally connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Must be bypassed with 0.1 µF capacitor to GND; powers all internal circuits including Hall plates, ADC, and I²C interface. |
| ADR0 | I²C address select 0 | Part of resistor-divider network setting one of 16 hardware addresses; voltage thresholds define logic level (0–0.1×VCC = 0, 0.23–0.43×VCC = 1, etc.). |
| GND | Ground reference | Common return path for analog and digital sections; connects to PCB ground plane under exposed pad for thermal stability. |
| INT | Interrupt output | Open-drain signal asserting when X/Y/Z field crosses programmable threshold; latching optional via EEPROM control bit. |
| NC (Pins 5,9,10) | No connect | Internally unconnected; must be tied to GND per layout guidelines to minimize noise coupling and ensure mechanical stability. |
| ADR1 | I²C address select 1 | Second address pin enabling full 2-bit hardware addressing; identical voltage threshold behavior as ADR0. |
| SDA | I²C serial data | Open-drain bidirectional line; requires external pull-up (2.4–10 kΩ); supports Fast Mode+ up to 1 MHz at 1.8–3.3 V. |
| SCL | I²C serial clock | Input-only clock line; timing compliant with I²C spec including tLOW ≥1.3 µs and tHIGH ≥0.6 µs at 1 MHz. |
| PAD | Exposed thermal pad | Not electrically connected; soldered to PCB copper pour to reduce θJA (65 °C/W on 2-layer board) and stabilize junction temperature. |
Key Features
| Feature | Design Value |
|---|---|
| Joystick-optimized Z-axis gain | 0.25 LSB/G enables use of compact NdFeB back-bias magnets for mechanical return-to-zero without springs or flexures. |
| Configurable low-power duty cycle | LPDCM allows user-defined inactive time (0.5–1000 ms) and active-time tuning via BW Select, achieving 12 µA avg current in motion-sensing standby. |
| On-chip temperature sensor | 12-bit output updated every 8 ms enables real-time thermal drift compensation of magnetic readings without external sensors. |
| Factory-trimmed sensitivity | ±1% typical accuracy across ±2000 G (X/Y) and ±8000 G (Z) ranges eliminates need for per-unit calibration in volume production. |
| I²C CRC support | Optional Cyclic Redundancy Check byte ensures data integrity in electrically noisy industrial or automotive HMI environments. |
Applications
| Gaming Joystick Interface | Medical Input Device |
|---|---|
Use Scenario: Analog-style 3D joystick in handheld game controller requiring tactile feedback and zero-force centering. IC Role / Device Role / Timing Role: ALS31300EEJALU-JOY measures orthogonal magnetic displacement from dual-axis slider and Z-axis push actuator, outputting synchronized 12-bit XYZ values via I²C at 100 Hz. Use Value: Back-bias magnet compatibility replaces spring mechanisms, reducing mechanical wear and enabling sealed, washable enclosures. |
Use Scenario: Sterile, low-power dial or slider control on infusion pump or diagnostic equipment requiring tamper-resistant, non-contact position sensing. IC Role / Device Role / Timing Role: ALS31300EEJALU-JOY serves as primary position transducer for rotary encoder replacement, reporting absolute angle and push depth over I²C with <1 ms latency. Use Value: 14 nA sleep current extends battery life beyond 5 years in always-on clinical devices; integrated temp sensor maintains accuracy across operating room temperature swings. |
| Industrial Human-Machine Interface | Automotive Cabin Control |
Use Scenario: Ruggedized control panel in factory automation with exposure to dust, vibration, and wide temperature variation. IC Role / Device Role / Timing Role: ALS31300EEJALU-JOY detects linear slide and rotational twist of sealed metal knob, transmitting position data to PLC via isolated I²C bus. Use Value: –40°C to +85°C rating and 100% matte-tin plating ensure long-term reliability in harsh environments; NC pins grounded to suppress EMI. |
Use Scenario: Climate control or infotainment dial in automotive cabin where EMI immunity and low quiescent current are critical. IC Role / Device Role / Timing Role: ALS31300EEJALU-JOY functions as contactless position sensor for rotary encoder emulation, delivering XYZ field data with I²C CRC enabled for fault-tolerant communication. Use Value: 1 MHz I²C Fast Mode+ supports fast polling in real-time vehicle networks; on-chip EEPROM stores calibrated offset values per unit to compensate for magnet aging. |
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 |
|---|---|---|---|
| MLX90393ELW-ABA-000-TU | Tri-axis Hall sensor with SPI/I²C output; ±2000 G full-scale on all axes; no dedicated joystick-mode Z-gain reduction. | Requires external gain scaling or firmware compensation for back-bias magnet return-to-zero; higher typical sleep current (250 nA). | Select when needing SPI interface or higher magnetic field immunity; not drop-in for ALS31300EEJALU-JOY's asymmetric Z-axis configuration. |
| TLE5012BE1000 | 3D Hall sensor with SENT/PWM output; ±1500 G full-scale; integrated angle calculation engine; no user EEPROM. | Designed for rotary angle output, not raw XYZ field data; lacks I²C interface and back-bias magnet optimization. | Prefer for automotive steering angle or motor commutation; unsuitable for joystick position decoding requiring independent axis access and EEPROM storage. |
Compared with MLX90393ELW-ABA-000-TU and TLE5012BE1000, ALS31300EEJALU-JOY uniquely combines factory-configured asymmetric Z-axis gain, 78-bit user EEPROM for HMI-specific calibration, and 14 nA sleep current-making it the only option validated for sealed, springless joystick designs requiring ultra-low power and I²C bus scalability.
Availability
ALS31300EEJALU-JOY is available at Aetrix Electronics and suitable for gaming peripherals, medical input devices, industrial HMI panels, and automotive cabin controls requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for ALS31300EEJALU-JOY 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 and manufacturer of high-performance magnetic sensing and power ICs, headquartered in Manchester, NH, with global manufacturing and test facilities.
The ALS31300 product line targets contactless 3D position sensing in human-machine interfaces, delivering factory-calibrated tri-axis Hall output with advanced low-power management and I²C configurability for next-generation joysticks, knobs, and sliders.
FAQ
What is the factory-programmed sensitivity configuration of ALS31300EEJALU-JOY?
The ALS31300EEJALU-JOY is factory-configured in joystick mode with X/Y-axis sensitivity of 1 LSB/G (±2000 G full-scale) and Z-axis sensitivity of 0.25 LSB/G (±8000 G full-scale). This asymmetric gain enables precise linear motion detection on X/Y while supporting strong back-bias magnets for Z-axis return-to-zero functionality without mechanical springs. The configuration is fixed and cannot be reprogrammed in the field.
How does ALS31300EEJALU-JOY achieve 14 nA sleep current, and what functions remain active?
The ALS31300EEJALU-JOY achieves 14 nA typical sleep current by disabling its Hall plates, ADC, temperature sensor, and internal clocks while retaining I²C slave logic. In sleep mode, the device remains responsive to I²C START/STOP conditions and address matching but does not update magnetic or temperature registers. Exit time equals the power-on delay (600 µs typ), after which full functionality resumes.
Can ALS31300EEJALU-JOY operate with a 1.8 V I²C bus, and what configuration is required?
Yes, ALS31300EEJALU-JOY supports 1.8 V I²C bus operation. To enable 1.8 V compatibility, the I2C Threshold bit (EEPROM address 0x02, bit 9) must be set to '1'. This lowers the logic-high input threshold to 1.26 V, ensuring reliable SDA/SCL recognition. The device maintains full 1 MHz Fast Mode+ timing compliance and supports pull-up voltages from 1.8 V to 3.3 V.
What is the purpose and capacity of the 78-bit user EEPROM in ALS31300EEJALU-JOY?
The 78-bit user EEPROM in ALS31300EEJALU-JOY provides non-volatile storage for application-specific calibration data, such as per-unit magnetic offset corrections, custom interrupt thresholds, or system identification codes. It is accessible via I²C after entering customer access mode and supports up to 1000 write cycles. No device functionality depends on this memory-it is purely for end-user configuration retention.
How is the exposed thermal pad (PAD) on ALS31300EEJALU-JOY used in PCB layout?
The exposed thermal pad (PAD) on ALS31300EEJALU-JOY is not electrically connected but must be soldered to a dedicated PCB copper pour tied to GND for optimal thermal performance. Per Allegro's thermal characterization, this reduces junction-to-ambient thermal resistance to 65 °C/W on a 2-layer board. Leaving the pad floating or unconnected degrades thermal stability and may cause measurement drift under sustained operation.
ALS31300EEJALU-JOY 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-JOY FAQ
1.How can I place an order for ALS31300EEJALU-JOY through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS31300EEJALU-JOY 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-JOY reliable?
The price and inventory of ALS31300EEJALU-JOY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS31300EEJALU-JOY is usually 5 days.
3.What payment methods are accepted for ALS31300EEJALU-JOY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS31300EEJALU-JOY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS31300EEJALU-JOY?
ALS31300EEJALU-JOY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS31300EEJALU-JOY 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-JOY?
For technical support, including ALS31300EEJALU-JOY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS31300EEJALU-JOY requirements.
6.How does Aetrix verify that ALS31300EEJALU-JOY is sourced from the original manufacturer or authorized distributors?
All ALS31300EEJALU-JOY 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-JOY meets industry standards.
7.What is the process for return or replacement of ALS31300EEJALU-JOY?
All ALS31300EEJALU-JOY units undergo pre-shipment inspection (PSI). If there is an issue with ALS31300EEJALU-JOY, 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-JOY part is unused and in its original packaging.
Return procedure for ALS31300EEJALU-JOY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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