MagAlpha MA780

8-Bit to 12-Bit, Low-Power Angle Sensor with

Integrated Wake-Up Angle Detection

MA780 Rev. 1.2

MonolithicPower.com

1

8/30/2021

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DESCRIPTION

The MA780 is a low-power angle sensor that

detects the absolute angular position of a

permanent magnet, such as a diametrically

magnetized cylinder on a rotating shaft. With its

power-cycling ability, the sensor is optimized for

applications that require low average power.

Timing can be controlled via an on-chip clock or

external controller. Flags are provided to detect

a definable amount of angle change.

The MA780 supports a wide range of magnetic

field strengths and spatial configurations. Both

end-of-shaft and off-axis (side-shaft mounting)

configurations are supported.

On-chip, non-volatile memory (NVM) provides

storage for configuration parameters, including

the reference zero-angle position, power cycling

parameters, and the filter window that affects the

output resolution.

The MA780 is available in a QFN-16 (3mmx3mm)

package.

FEATURES

 8-Bit to 12-Bit Resolution Absolute

Contactless Angle Encoder

 <0.5µA Current Consumption in Idle Mode

 10mA Current Consumption in Active Mode

 Angle Detection Interrupt to Wake System

 Supports On-Axis and Off-Axis Operation

 Serial Peripheral Interface (SPI)

 3.3V Supply

 -40°C to +125°C Operating Temperature

 Available in a QFN-16 (3mmx3mm)

Package

APPLICATIONS

 General-Purpose Angle Measurements

 Battery-Powered Devices

 Multi-Turn Encoders

 Low-Power Rotary Knob Interfaces

All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive.

For MPS green status, please visit the MPS website under Quality

Assurance. “MPS”, the MPS logo, and “Simple, Easy Solutions” are

trademarks of Monolithic Power Systems, Inc. or its subsidiaries.

TYPICAL APPLICATION

Controller

MISO

MOSI

SCLK

CS

GND

SPI

Interface

Master

Target Magnet

1µF

VDD

ND

VDDIO

Example: 10Hz

Supply: 3.3V

Example: 100µA average

MA780