AS5147P-HTST datasheet(9/40 Pages) AMSCO

9 / 40 page

ams Datasheet

Page 9

[v1-01] 2015-May-12

Document Feedback

AS5147P − Detailed Description

The AS5147P is a Hall-effect magnetic sensor using a CMOS

technology. The 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 rotation

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 AS5147P generates continuously the angle information,

which can be requested by the different interfaces of the device.

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

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

be programmed for 10, 11 or 12 bits.

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 AS5147P, reducing the

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

AS5147P allows selecting between a UVW output interface and

a PWM-encoded interface on the W pin.

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 AS5147P can be programmed

through the SPI interface without any dedicated programmer.

The AS5147P can support high speed application up to 28krpm.

Detailed Description

AS5147P-HTST датащи(PDF) 9 Page - ams AG