AS5047D datasheet(9/37 Pages) AMSCO

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ams Datasheet: 2014-Jun-27 [v1-02]

AS5047D – 9

Detaile d Desc rip t ion

The AS5047D is a Hall-effect magnetic sensor using a CMOS

lateral technology. The lateral Hall sensors convert the

magnetic field component perpendicular to the surface of the

chip into a voltage.

The signals from the Hall sensors 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 the

temperature and magnetic field variations.

The internal 14-bit resolution is available by reading a register

through the SPI interface. The resolution on the ABI output can

be programmed from 2048 to 32 steps per revolution.

The Dynamic Angle Error Compensation block corrects the

calculated angle for latency using a linear prediction

calculation algorithm. At constant rotation speed the latency

time is internally compensated by the AS5047D, reducing the

dynamic angle error at the SPI, ABI and UVW outputs. The

AS5047D allows to switch off the UVW output interface to

display the absolute angle as PWM-encoded signal on the

pin W.

At higher speeds, the interpolator fills in missing ABI pulses and

generates the UVW signals with no loss of resolution. The

non-volatile settings in the AS5047D can be programmed

through the SPI interface without any dedicated programmer.

Power Management

The AS5047D can be either powered from a 5.0V supply using

the on-chip low-dropout regulator or from a 3.3V voltage

supply. The LDO regulator is not intended to power any other

loads, and it needs a 1 μF capacitor to ground located close to

the chip for decoupling as shown in Figure 10.

In 3.3V operation, VDD and VREG must be tied together.

Figure 10:

5.0V and 3.3V Power Supply Options

Detailed Description

1µF

100nF

4.5 - 5.5V

VDD3V3

GND

VDD

5.0V Operation

LDO

AS5047D

100nF

3.0 – 3.6V

VDD3V3

GND

VDD

3.3V Operation

LDO

AS5047D

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