Data Sheet
AS5140H
10-Bit 360º Programmable Magnetic Rotary Encoder For High
A m b i e n t Te m p e r a t u r e s
1 General Description
The AS5140H is a contactless magnetic rotary encoder for accurate
angular measurement over a full turn of 360º and over an extended
ambient temperature range of -40ºC to +150ºC.
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 0.35º = 1024 positions
per revolution. This digital data is available as a serial bit stream and
as a PWM signal. Furthermore, a user-programmable incremental
output is available.
An internal voltage regulator allows the AS5140H to operate at either
3.3V or 5V supplies.
The AS5140H is pin-compatible to the AS5040; however it uses low-
voltage OTP programming cells with additional programming
options.
2 Key Features
Contactless high resolution rotational position encoding over a
full turn of 360º
Two digital 10-bit absolute outputs: Serial interface and Pulse
width modulated (PWM) output
Three incremental output modes: Quadrature A/B and Index
output signal, Step / Direction and Index output signal, 3-phase
commutation for brushless DC motors
User programmable zero / index position
Failure detection mode for magnet placement monitoring and
loss of power supply
Rotational speeds up to 10.000 rpm
Pushbutton functionality detects movement of magnet in Z-axis
Serial read-out of multiple interconnected AS5140H devices
using Daisy Chain mode
Fully automotive qualified to AEC-Q100, grade 0
Wide ambient temperature range: -40ºC to +150ºC
3 Applications
Figure 1. AS5140H IC Block Diagram
The AS5140H is an ideal solution for automotive applications like
engine compartment sensors, transmission gearbox encoder, throttle
valve position control and for industrial applications like rotary
sensors in high temperature environment.
VDDV3V
MagINCn
MagDECn
PWM
Interface
Sin
Ang
VDD5V
LDO 3.3V
PWM_LSB
Hall Array
&
Frontend
Amplifier
Cos
DSP
Mag
Absolute
Interface
(SSI)
DO
CSn
CLK
OTP
Register
Programming
Parameters
Incremental
Interface
A_LSB_U
B_Dir_V
Index_W
Prog
AS5140H
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