Hall Sensor IC Infineon TLE4964-3M: Datasheet, Pinout, and Application Circuits
The Infineon TLE4964-3M is a high-precision, vertical Hall sensor designed for ultra-low power consumption applications. This integrated circuit is engineered for robust performance in demanding automotive and industrial environments, primarily serving as a contactless magnetic switch for position and speed sensing.
This article provides a detailed overview of its datasheet specifications, pinout configuration, and typical application circuits.
Datasheet Overview and Key Features
The TLE4964-3M is a latch-type Hall switch. Its key operational characteristics, derived from its datasheet, include:
Magnetic Switching Points: The device features well-defined magnetic switching thresholds (BOP and BRP), ensuring precise and jitter-free switching behavior. The latching function means it maintains its output state until a magnetic field of opposite polarity exceeding the release threshold is applied.
Ultra-Low Power Operation: A standout feature is its very low supply current, typically around 3.5 µA. This makes it exceptionally suitable for battery-powered and energy-sensitive applications.
Reverse Voltage Protection: The IC is equipped with integrated protection against reverse voltage on the supply pin (up to -18V), safeguarding the sensor from accidental incorrect wiring.
Wide Operating Voltage Range: It functions reliably with a supply voltage (VS) from 3.0 V to 32 V, covering a broad spectrum of use cases from 3.3V/5V logic to automotive 12V/24V systems.
AEC-Q100 Qualified: This certification confirms its suitability for automotive applications, ensuring reliability under harsh conditions including wide temperature ranges (-40 °C to 150 °C) and high EMC robustness.
Push-Pull Output: The output stage is a robust push-pull configuration, capable of sinking and sourcing current, which eliminates the need for an external pull-up resistor.
Pinout Configuration
The TLE4964-3M is available in a small and surface-mountable SOT23-3 package. The pinout is as follows:
1. Pin 1 (VCC): This is the positive supply voltage pin. It should be connected to the regulated power supply, typically between 3.0V and 32V.
2. Pin 2 (GND): This is the ground pin. It must be connected to the system ground.
3. Pin 3 (OUTPUT): This is the digital output pin. In the presence of a sufficient South pole magnetic field (towards the branded side of the package), the output switches to a low level. It switches to a high level when a sufficient North pole magnetic field is detected.
Application Circuits
The TLE4964-3M is simple to integrate into a system. Its basic application circuit requires very few external components.
1. Basic Application Circuit:
The most straightforward implementation only requires two external components: a bypass capacitor (typically 100 nF) placed as close as possible between the VCC and GND pins to suppress noise on the supply line, and a current-limiting resistor in series with an LED if visual indication is needed. The push-pull output can directly drive a microcontroller's input pin or a logic gate without any external pull-up resistor.
2. Automotive Speed Sensing (e.g., Wheel Speed):
A common automotive application is wheel speed sensing for ABS or traction control systems. A permanent magnet is mounted on the sensor, and a ferromagnetic target wheel (tone ring) with teeth rotates past it. As each tooth approaches and passes the sensor, it distorts the magnetic field, causing it to fluctuate. This change in magnetic flux density triggers the Hall switch, producing a digital square wave signal at the OUTPUT pin. The frequency of this signal is directly proportional to the speed of the wheel.
3. Position Sensing (e.g., Door/Window Open/Close Detection):
For detecting the open or closed state of a door or window, a simple bi-polar magnet is attached to the moving part. In the "closed" position, the South pole of the magnet is close to the sensor, forcing the output low. When the door is opened, the magnet moves away and a North pole magnet (or a different part of the same magnet) comes into proximity, causing the output to latch high and signal the "open" state. This provides a non-contact, wear-free alternative to mechanical limit switches.
ICGOODFIND: The Infineon TLE4964-3M is an exceptionally efficient and robust latch-type Hall effect sensor IC. Its ultra-low power consumption and high reliability, backed by AEC-Q100 qualification, make it an ideal choice for designers working on automotive systems like seat position detection and wheel speed sensing, as well as portable consumer and industrial equipment requiring precise, contactless magnetic switching with minimal battery drain.
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Keywords: Hall Effect Sensor, Ultra-Low Power Consumption, AEC-Q100, Latch-Type Switch, Magnetic Switching
