AS5045B Rotary Sensor
12-bit rotary position sensor with digital angle (interface) and PWM and ABI output
Features
- Contactless absolute angle position measurement and motion sensing
- User programmable zero position
- Multiple interfaces (SSI, ABI, PWM)
- Immune to external magnetic stray fields
Benefits
- Highest reliability and durability in harsh environments
- Great flexibility during assembly
- One device for different applications
- Lower material cost (no magnetic shielding needed)
Product parameters
Resolution [bit] | 12 |
---|---|
Interfaces | SSI |
Output | Digital angle (interface) / ABI / PWM |
Max. Speed [rpm] | |
Overvoltage Protection | |
Redundant | |
Supply Voltage [V] | 3.3 or 5.0 |
Temperature Range [°C] | -40 to +125 |
Package | SSOP-16 |
Automotive Qualified |




General Description
The AS5045B is a 12-bit rotary position sensor (previously known as encoder) for absolute angular measurement and with an incremental output over a full turn of 360° based on contactless magnetic sensor technology. This device fits perfectly for on-axis applications where a simple 2-pole magnet rotates above or below the sensor IC and the zero position can be programmed into the device. The absolute magnet angular position is measured with a resolution of 12 bit = 4096 positions per revolution and it is provided as a digital value on the serial interface (SSI) and on the PWM output signal.
With two decades of magnetic sensor system know-how, we have broad experience in selecting the most suitable magnets. ams experts recommend the following magnet suppliers.

This product suits for the following applications:
- Motor speed and motion sensor
- Replacement of optical magnetic position sensors
- Automatic doors
- Robotics

Tools
Title | Category | Headline | Buy |
---|---|---|---|
AS5045BAdapterBoard | Application Board | Adapter Board for AS5045B | |
RMH05-DK-XX | Accessories | Rotary Magnetic Holder | |
SD4Y-PP | Accessories | Production Programmer SD4Y |
Technical Documents
Type | Description | Language | ||
---|---|---|---|---|
Datasheet | Document version 2-00 | English | ||
Application Note | AN5000 Magnet Selection Guide v1-04 | English | ||
Application Note | Tape & Reel Packing Information | English |
Environmental Documents
Type | Description | Language | ||
---|---|---|---|---|
RoHS Certificate | RoHS Certificate AS5045B | English |
Other Information
Type | Description | Language | ||
---|---|---|---|---|
Block Diagram | AS5045B Block Diagram | English | ||
Image | AS5000 Programmer Image | English |
AS5045B Rotary Sensor
Related Boards
Adapter Board for AS5045B
AS5045BAdapterBoard

Rotary Magnetic Holder
RMH05-DK-XX

Production Programmer SD4Y
SD4Y-PP

The GUI and the Labview source code are available. Additional code samples for C; C++ and C# are available.
Download latest software (UProg_SW_package_2v0.zip, 264MB)
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