AS5145 Datasheet, PDF (1/36 Pages) ams AG – 12-Bit Programmable Magnetic Rotary Encoder

Data Sheet
AS5145/AS5145A/AS5145B
12-Bit Programmable Magnetic Rotary Encoder
1 General Description
The AS5145 is a contact less magnetic rotary encoder 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 may 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 AS5145 to operate at either
3.3V or 5V supplies.
2 Key Features
Contact less high resolution rotational position encoding over a
full turn of 360 degrees
Two digital 12 bit absolute outputs:
- Serial interface
- Pulse width modulated (PWM) output
Three incremental outputs
Quadrature A/B (10 or 12 bit) and Index output signal (pre-
programmed versions available AS5145A for 10 bit and
AS5145B for 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 AS5145 devices
using Daisy Chain mode
Tolerant to magnet misalignment and gap variations
Wide temperature range: - 40ºC to +150ºC
Fully automotive qualified to AEC-Q100, grade 0
Small Pb-free package: SSOP 16 (5.3mm x 6.2mm)
3 Applications
The device is ideal for industrial applications like contactless rotary
position sensing and robotics; automotive applications like steering
wheel position sensing, transmission gearbox encoder, head light
position control, torque sensing, valve position sensing and
replacement of high end potentiometers.
Figure 1. AS5145 Automotive Rotary Encoder IC
VDD5V
Mode_Index
VDD3V3
LDO 3.3V
Sin
Hall Array
Cos
&
Front end
Amplifier
Mux
Ang
DSP
Mag
OTP
Register
AS5145
PWM
Interface
Absolute
Interface
(SSI)
Incremental
Interface
MagINCn
MagDECn
PWM
DO
CSn
CLK
PDIO
DTEST1_A
DTEST2_B
www.austriamicrosystems.com/AS5145
Revision 1.10
1 - 36