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AS5140H
10-Bit 360º Programmable Magnetic Rotary Encoder For High Ambient Temperatures
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.
Ordering Information and Content Guide appear at end of datasheet.
Figure 1: Added Value of Using AS5140H
Key Benefits & Features
The benefits and features of AS5140H, 10-Bit 360º Programmable Magnetic Rotary Encoder For High Ambient Temperatures are listed below:
Benefits
No mechanical wear High resolution absolute position sensing Easy to use for motor control Adjustable zero position
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
ams Datasheet [v1-09] 2018-Feb-20
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AS5140H − General Description
Benefits
Features
Tolerant to magnet misalignment
Failure detection mode for magnet placement monitoring and loss of power supply
Usable for high speed applications
Rotational speeds up to 10000 rpm
Tolerant to airgap variations
Pushbutton functionality detects movement of magnet in Z-axis
Supports daisy chain application
Serial read-out of multiple interconnected AS5140H devices using Daisy Chain mode
Fitting to automotive applications
Fully automotive qualified to AEC-Q100, grade 0
Operates up to 150°C ambient temperature Wide ambient temperature range: -40ºC to 150ºC
Figure 2: AS5140H Block Diagram
Applications
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.
Block Diagram
The functional blocks of this device for reference are shown below:
9''9
9''99
LDO 3.3V
6LQ
Hall Array &RV &
Frontend Amplifier
AS5140H
$QJ
DSP
0DJ
OTP Register
Programming Parameters
PWM Interface
Absolute Interface
(SSI)
Incremental Interface
0DJ,1&Q 0DJ'(&Q 3:0B/6%
'2 &6Q &/.
$B/6%B8 %B'LUB9 ,QGH[B: 3URJ
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ams Datasheet [v1-09] 2018-Feb-20
AS5140H − Pin Assignment
Pin Assignment
Figure 3: Pin Diagram (Top View)
0DJ,1&Q
0DJ'(&Q
$B/6%B8
%B'LUB9
1&
,QGH[B:
966
3URJ
AS5140H
9''9
9''9
1&
1&
3:0B/6%
&6Q
&/.
'2
Figure 4: Pin Description
Pin Description
The following figure shows the description of each pin of the standard SSOP16 package (Shrink Small Outline Package, 16 leads, body size: 5.3mm x 6.2mmm; See Figure 3).
Pin Number Pin Name
Description
1
MagINCn
Magnet Field Magnitude Increase. Active low. Indicates a distance reduction between the magnet and the device surface.
2
MagDECn
Magnet Field Magnitude Decrease. Active low. Indicates a distance increase between the device and the magnet.
Mode1.x: Quadrature A channel
3
A_LSB_U Mode2.x: Least Significant Bit
Mode3.x: U signal (phase1)
Mode1.x: Quadrature B channel quarter period shift to channel A
4
B_Dir_V Mode2.x: Direction of Rotation
Mode3.x: V signal (phase2)
5
NC
For internal use. Must be left unconnected.
6
Index_ W
Mode1.x and Mode2.x: Index signal indicates the absolute zero position Mode3.x: W signal (phase3)
ams Datasheet [v1-09] 2018-Feb-20
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AS5140H− PinAssignment
Pin Number Pin Name
Description
7
VSS
Negative Supply Voltage (GND).
OTP Programming Input and Data Input for Daisy Chain mode. Internal
8
Prog
pull-down resistor (~74kΩ). May be connected to VSS if programming is not
used.
9
DO
Data Output of Synchronous Serial Interface.
10
CLK
SSI Clock Input. Schmitt-Trigger input.
Chip Select. Active low; Schmitt-Trigger input, internal pull-up resistor
11
CSn
(~50kΩ) connect to VSS in incremental mode (see Incremental Power-up
Lock Option on page 21)
12
PWM_L.