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[v2-04] 2015-Oct-07

AS5410 − General Description

3D Hall cells:

The AS5410 contains two 3D Hall cells, spaced 2.5mm apart.

MUX:

The multiplexer selects two magnetic field components Bx and Bz as the inputs

for the CORDIC. The selected inputs can either be absolute sensor signals or

differential sensor signals.

ADC:

The Sigma-Delta ADC samples the Hall sensors signals selected by the MUX. The

sampling of the sensors is done sequentially.

Signal conditioning:

This block includes offset and temperature compensation as well as amplitude

matching.

Bi/Bj values:

This block represents the registers containing the input sensor signals of the

CORDIC inputs.

ATAN:

Coordinate to Rotation Digital Computer: This block converts rectangular

coordinates (sine and cosine signals from the Hall sensors) into polar coordinates

(angle/distance and magnitude).

Linearization:

A 33-point linearization of the CORDIC output data is available to accommodate a

variety of different magnet sizes and applications.

Temperature sensor:

An on-chip temperature sensor is available. It can be read over the SPI interface.

This sensor is also used for signal conditioning.

PWM interface:

The linearized measurement data is available over a single pin in the form of a

pulse width modulated (PWM) signal.

SPI interface:

A bi-directional SPI interface allows communication with the chip, including

reading measurement data, E²PROM contents or writing configuration data.

E²PROM:

The on-chip E²PROM contains the configuration data of the chip.

State machine:

The state machine (sequencer) controls the automatic sequencing of

measurements. Once it is configured for a certain measurement, the state

machine executes all necessary steps to perform a complete measurement cycle.

Configuration:

The configuration is pre-defined in the AS5410. Mode selection.

AS5410 Datasheet(PDF) 4 Page - ams AG

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