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PDF AS5140H Data sheet ( Hoja de datos )
| Número de pieza | AS5140H | |
| Descripción | 10-Bit 360 Programmable Magnetic Rotary Encoder | |
| Fabricantes | austriamicrosystems AG | |
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Data Sheet
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AS5140H
10-Bit 360º Programmable Magnetic Rotary Encoder For High
Ambient Temperatures
1 General Description
2 Key Features
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.
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.
VDD5V
VDDV3V
LDO 3.3V
Hall Array
&
Frontend
Amplifier
Sin
Cos
AS5140H
Ang
DSP
Mag
OTP
Register
Programming
Parameters
PWM
Interface
Absolute
Interface
(SSI)
Incremental
Interface
MagINCn
MagDECn
PWM_LSB
DO
CSn
CLK
A_LSB_U
B_Dir_V
Index_W
Prog
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Revision 1.4
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1 page  
AS5140H
Data Sheet - Pin Assignments
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Table 1. Pin Descriptions
Pin Name
PWM_LSB
NC
NC
VDD3V3
VDD5V
Pin Number
12
13
14
15
16
Description
Pulse Width Modulation of approx. 1kHz; LSB in Mode3.x
For internal use. Must be left unconnected.
For internal use. Must be left unconnected.
3V-Regulator Output (see Figure 17)
Positive Supply Voltage 5V
Pins 1 and 2 are the magnetic field change indicators, MagINCn and MagDECn (magnetic field strength increase or decrease through variation
of the distance between the magnet and the device). These outputs can be used to detect the valid magnetic field range. Furthermore those
indicators can also be used for contact-less push-button functionality. Pins 3, 4 and 6 are the incremental pulse output pins. The functionality of
these pins can be configured through programming the one-time programmable (OTP) register:
Table 2. Pin Assignment for Different Incremental Output Modes
Output Mode
Pin 3
Pin 4
Pin 6
Pin 12
1.x: Quadrature
A
B
Index
PWM
2.x: Step/direction
LSB
Direction
Index
PWM
3.x: Commutation
U V W LSB
Mode 1.x: Quadrature A/B Output
Represents the default quadrature A/B signal mode.
Mode 2.x: Step / Direction Output
Configures pin 3 to deliver up to 512 pulses (up to 1024 state changes) per revolution. It is equivalent to the LSB (least significant bit) of the
absolute position value. Pin 4 provides the information of the rotational direction.
Note: Both modes (mode 1.x and mode 2.x) provide an index signal (1 pulse/revolution) with an adjustable width of one LSB or three LSB’s.
Mode 3.x: Brushless DC Motor Commutation Mode
In addition to the absolute encoder output over the SSI interface, this mode provides commutation signals for brushless DC motors with either
one pole pair or two pole pair rotors. The commutation signals are usually provided by 3 discrete Hall switches, which are no longer required, as
the AS5140H can fulfill two tasks in parallel: absolute encoder + BLDC motor commutation. In this mode,
- Pin 12 provides the LSB output instead of the PWM (Pulse-Width-Modulation) signal.
- Pin 8 (Prog) is also used to program the different incremental interface modes, the incremental resolution and the zero position into the
OTP (see page 21). This pin is also used as digital input to shift serial data through the device in Daisy Chain configuration, (see page 14).
- Pin 11 Chip Select (CSn; active low) selects a device within a network of AS5140H encoders and initiates serial data transfer. A logic high
at CSn puts the data output pin (DO) to tri-state and terminates serial data transfer. This pin is also used for alignment mode (see page
22) and programming mode (see page 19).
- Pin 12 allows a single wire output of the 10-bit absolute position value. The value is encoded into a pulse width modulated signal with 1µs
pulse width per step (1µs to 1024µs over a full turn). By using an external low pass filter, the digital PWM signal is converted into an ana-
log voltage, allowing a direct replacement of potentiometers.
www.austriamicrosystems.com/AS5140H
Revision 1.4
5 - 37
5 Page 
AS5140H
Data Sheet - Electrical Characteristics
Figure 3. Integral and Differential Non-Linearity Example (exaggerated curve)
1023 α 10bit code
2
1
0
512
Actual curve
TN Ideal curve
DNL+1LSB
INL
0.35°
512
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1023
0
0°
180°
360 °
α [degrees]
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Revision 1.4
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