Position Sensor ICs

Allegro's Hall-effect position sensor ICs detect changes in magnetic flux density, allowing them to distinguish movement and position. These contactless sensing solutions require few external components and can withstand the hostile operating conditions of multiple applications from automotive to industrial.

Hall-Effect Digital Switches

• Single / Differential Hall-Effect Sensors
• Chopper stabilized / Continuous
• Unipolar / Omnipolar

Hall-Effect Digital Latches

• Unipolar / Omnipolar
• Chopper stabilized / Continuous
• Planar or Vertical Hall-Effect Sensors

Hall-Effect Speed / Direction / Multi-Elements

• Dual Planar Hall-Effect Sensor
• One Planar / One Vertical Hall-Effect Sensors
• 3D Hall-Effect Sensor

Hall-Effect Sensor Basics

Latch Hall-Effect Switches Selection | Switch Hall-Effect Switches Selection

Allegro’s Hall-effect linear position sensor ICs enable highly accurate contactless sensing of either magnet or ferrous objects, and depending upon the specific linear sensor, can be factory and/or customer programmed. Allegro’s linear position sensor IC portfolio supports analog, PWM and standard digital output protocols such as SENT (Single Edge Nibble Transmission) and are available in various bandwidth, resolution and accuracy options. They are offered in ultra-small packages, including the SOT23-W surface mount package and the 1 mm thick single in-line KT package.

Specific advantages of Allegro’s solutions include:

• 4x chopper-stabilization for offset cancellation provides: enhanced switch point stability that increases accuracy in measuring motor speed or duty cycle, and industry leading jitter performance that outperforms the competition
• Low voltage (3 V) operation and lower ICC for more power efficient devices
• Many standard products are designed to survive harsh automotive transient conditions, including double battery and 40 V load dump, without a limiting series resistor, which eliminates the need for external components and prevents transient voltage field failures

Latch Hall-Effect Switches Selection | Switch Hall-Effect Switches Selection

Hall-effect latches are most commonly used in sensing multi-pole ring magnets for motor commutation, because they require a south pole of sufficient strength to turn the output on and a north pole of sufficient strength to turn the output off.

Specific advantages of Allegro’s solutions include:

• 4x chopper-stabilization for offset cancellation provides: enhanced switch point stability that increases accuracy in measuring motor speed or duty cycle, and industry leading jitter performance that outperforms the competition
• Low voltage (3 V) operation and lower ICC for more power efficient devices
• Many standard products are designed to survive harsh automotive transient conditions, including double battery and 40 V load dump, without a limiting series resistor, which eliminates the need for external components and prevents transient voltage field failures

Latch Hall-Effect Switches Selection | Switch Hall-Effect Switches Selection

Micropower switches are integrated Hall-effect sensor ICs designed specifically for use in battery-operated devices, providing low power consumption for longer battery life. They are typically used for on/off switches (open/close) in cellular flip-phones, PDAs, and laptop computers, or for detecting motion in utility meters.

Features:

• Low power
• Small packaging

Latch Hall-Effect Switches Selection | Switch Hall-Effect Switches Selection

Temperature range codes: S = -20°C to 85°C, E = -40°C to 85°C, K = -40°C to 125°C, L = -40°C to 150°C

Temperature range codes: S = -20°C to 85°C, E = -40°C to 85°C, K = -40°C to 125°C, L = -40°C to 150°C