AS5045B Datasheet, PDF (1/33 Pages) ams AG – 12-Bit Programmable Magnetic Position Sensor

AS5045B
12-Bit Programmable Magnetic Position Sensor
1 General Description
The AS5045B is a contact less magnetic position sensor for accurate
angular measurement over a full turn of 360 degrees.
It is a system-on-chip, combining integrated Hall elements, analog
front end and digital signal processing in a single device.
To measure the angle, only a simple two-pole magnet, rotating over
the center of the chip, is required. The magnet can be placed above
or below the IC.
The absolute angle measurement provides instant indication of the
magnet’s angular position with a resolution of 0.0879º = 4096
positions per revolution. This digital data is available as a serial bit
stream and as a PWM signal.
An internal voltage regulator allows the AS5045B to operate at either
3.3V or 5V supplies.
2 Key Features
Contact less high resolution rotary position sensor over a full
turn of 360 degrees
Figure 1. Blockdiagram Rotary Position Sensor IC
Two digital 12-bit absolute outputs:
- Serial interface
- Pulse width modulated (PWM) output
Quadrature A/B/I output 12-bit
User programmable zero position
Failure detection mode for magnet placement, monitoring, and
loss of power supply
Red-Yellow-Green indicators display placement of magnet in Z-
axis
Serial read-out of multiple interconnected AS5045B devices
using Daisy Chain mode
Tolerant to magnet misalignment and gap variations
Wide temperature range: - 40ºC to +125ºC
Small Pb-free package: SSOP 16 (5.3mm x 6.2mm)
3 Applications
The device is ideal for industrial applications like automatic or
elevator doors, robotics, motor control and optical encoder
replacement.
VDD5V
VDD3V3
LDO 3.3V
Sin
Hall Array
Cos
&
Frontend
Amplifier
Ang
ATAN
(Cordic)
Mag
PWM
Interface
Absolute
Interface
(SSI)
OTP
Register
AS5045B
Incremental
Interface
MagINCn
MagDECn
PWM
DO
CSn
CLK
PDIO
A
B
I
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