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Datasheet
AS5134
360 Step Programmable High Speed Magnetic Rotary Encoder
1 General Description
The AS5134 is a contactless magnetic rotary encoder for accurate
angular measurement over a full turn of 360º. 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 absolute angle measurement
provides instant indication of the magnet’s angular position with a
resolution of 8.5 bit = 360 positions per revolution. This digital data is
available as a serial bit stream and as a PWM signal. In addition to
the angle information, the strength of the magnetic field is also
available as a 6-bit code.
Data transmission can be configured for 1-wire (PWM), 2-wires
(DCLK, DIO) or 3-wires (DCLK, DIO, CS).
Two digital 360 step (8.5 bit) absolute outputs: Serial interface
and Pulse width modulated (PWM) output
User programmable zero position and sensitivity
High speed: up to 76875 rpm
Direct measurement of magnetic field strength allows exact
determination of vertical magnet distance
180ppr, fixed pulse width 360ppr
Incremental Outputs ABI Quadrature: 90 ppr, step direction:
BLDC Outputs UVW, selectable for 1,2,3,4,5,6 pole pairs
Daisy-Chain mode for cascading of multiple sensors
9-bit multi turn counter
A software programmable (OTP) zero position simplifies assembly
as the zero position of the magnet does not need to be mechanically
aligned.
A Power Down Mode together with fast startup and measurement
cycles allows a very low average power consumption.
2 Key Features
360º contactless angular position encoding
Figure 1. AS5134 Magnetic Rotary Encoder Block Diagram
VDD 5 V
ch
ni
c
Te
Hall Array
&
Frontend
Amplifier
GND
www.austriamicrosystems.com/AS5134
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lv
Low power mode with fast
startup
Wide magnetic field input range: 20- 80 mT
Wide temperature range: -40ºC to +140ºC
Fully automotive qualified to AEC-Q100
Small Pb-free
package: SSOP 20
3 Applications
The AS5134 is suitable for contactless rotary position sensing, rotary
switches (human machine interface), AC/DC motor position control
and Brushless DC motor position control.
U V W
A B Index
Incremental
Interface
Commutation
Interface
PWM Decoder
Multiturn
Counter
Tracking ADC
& Angle
Decoder
Mag
Zero
Pos.
Angle
AS5134
AGC
AGC
Absolute
Serial
Interface
(SSI)
Power Management
OTP
Revision 2.3
al
id
PWM
DIO
CS
CLK
C2
DX
PROG
1 - 32
AS5134
Datasheet - C o n t e n t s
Contents
1 General Description ..................................................................................................................................................................
5 Absolute Maximum Ratings ......................................................................................................................................................
7.2 Serial 3-Wire R/W Connection..............................................................................................................................................................
7.4 Serial 2-Wire Connection (R/W Mode) ...............................................................................................................................................
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Revision 2.3
7.1 Connecting the AS5134........................................................................................................................................................................
7.3 Serial 3-Wire Read-only Connection ....................................................................................................................................................
7.5 Serial 2-Wire Differential SSI Connection...........................................................................................................................................
7.7 Analog Output.....................................................................................................................................................................................
7.9 Brushless DC Motor Commutation Mode ...........................................................................................................................................
7.11 Serial Synchronous Interface (SSI) ..................................................................................................................................................
8 Application Information ...........................................................................................................................................................
8.2 AS5134 Status Indicators ...................................................................................................................................................................
24
8.2.1 Lock Status Bit........................................................................................................................................................................... 24
8.2.2 Magnetic Field Strength Indicators ............................................................................................................................................ 24
8.3 Multi Turn Counter..............................................................................................................................................................................
8.4 High Speed Operation ........................................................................................................................................................................
25
25
9 Package Drawings and Markings ...........................................................................................................................................
8.4.2 Digital Readout Rate.................................................................................................................................................................. 26
8.4.3 Low Power Mode ....................................................................................................................................................................... 26
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