AS5050A datasheet(9/31 Pages) AMSCO

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ams Datasheet

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[v2-03] 2014-Jul-31

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AS5050A − Detailed Description

Typical Application

The AS5050A uses on-chip Hall elements to convert the

magnetic field component perpendicular to the surface of the

chip into a voltage.

The signals from the Hall elements are amplified and filtered by

the analog front-end (AFE) before being converted by the

analog-to-digital converter (ADC). The output of the ADC is

processed by the hardwired CORDIC (coordinate rotating

digital computer) block to compute the angle and magnitude

of the magnetic vector. The intensity of the magnetic field

(magnitude) is used by the automatic gain control (AGC) to

adjust the amplification level for compensation of temperature

and magnetic field variations.

The internal 10-Bit resolution is available by reading a register

through the SPI interface. The IC settings in the AS5050A can

be programmed through the SPI interface without any

dedicated programmer.

Figure 10:

Typical Application Using SPI 4-Wire Mode and INT/ Output

Figure 10 shows how the AS5050A can be connected to a

microcontroller. The SPI interface is a slave interface for

accessing the on-chip registers. The INT/ output is an active-low

interrupt for informing the host microcontroller when a new

result is available.

ADC

AS5050A

VDD

VSS

SS/

MOSI

SCK

MISO

Analog

Front-End

ATAN

(CORDIC)

AGC

INT/

EN_INT/

Hall Sensors

Low Power Management

VDDp

SPI

Test

µC

4.7µF

15 R

DC 3.0V – 3.6V

DC 1.8V – 3.6V

SPI

Interface

Interrupt

100nF

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