AS5134
3 6 0 St e p P r o g r a m m a b l e H i g h Sp e e d M a g n e t i c
R o ta r y E n c o d e r
D a ta S he e t
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).
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 for very low average power
consumption.
2 Key Features
360º contactless angular position encoding
Two digital 360 step (8.5 bit) absolute outputs: Serial
interface and Pulse width modulated (PWM) output
User programmable zero position, sensitivity
High speed: up to 30.000 rpm
Direct measurement of magnetic field strength
allows exact determination of vertical magnet dis-
tance
Incremental Outputs ABI Quadrature: 90 ppr, step
direction: 180ppr, fixed pulse width 360ppr
BLDC Outputs UVW, selectable for 1,2,3,4,5,6 pole
pairs
Daisy-Chain mode for cascading of multiple sensors
9-bit multiturn counter
Low power mode with fast startup
Wide magnetic field input range: 20 – 80 mT
Wide temperature range: - 40ºC to +140ºC
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.
Figure 1. Block Diagram
VDD5V
U V W
A
B Index
Commutation Incremental
Interface
Interface
Hall Array
&
Frontend
Amplifier
AS5134
tracking
ADC &
Angle
decoder
Zero
Pos.
Angle
Mag
AGC
PWM
Decoder
Multiturn
Counter
Absolute
Serial
Interface
(SSI)
PWM
DIO
CS
CLK
C2
DX
AGC
OTP
power management
GND
PROG
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