Document
General Description
Figure 1: Added Value of Using AS5145
Benefits
• Highest reliability and durability • Simple programming • Multiple interfaces • Ideal for motor applications • Failure diagnostics • Easy setup
AS5145H/AS5145A/ AS5145B
12-Bit Programmable Magnetic Rotary Encoder
The AS5145 is a contactless magnetic rotary encoder for accurate angular measurement over a full turn of 360 degrees. 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 can be placed above or below the IC. The absolute angle measurement provides instant indication of the magnet’s angular position with a resolution of 0.0879º = 4096 positions per revolution. This digital data is available as a serial bit stream and as a PWM signal. An internal voltage regulator allows the AS5145 to operate at either 3.3V or 5V supplies. Ordering Information and Content Guide appear at end of datasheet.
Key Benefits & Features
The benefits and features of AS5145H/AS5145A/AS5145B, 12-Bit Programmable Magnetic Rotary Encoder are listed below:
Features
• Contactless high resolution rotational position encoding over a full turn of 360 degrees
• Simple user-programmable zero position and settings
• Serial communication interface (SSI) • 10-bit pulse width modulated (PWM) output • Quadrature A/B and Index output signal
• Rational speeds up to 30,000 rpm
• Failure detection mode for magnet placement monitoring and loss of power supply
• Serial read-out of multiple interconnected AS5145 devices using Daisy Chain mode
ams Datasheet [v2-02] 2020-Nov-25
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AS5145H/AS5145A/AS5145B− GeneralDescription
Benefits
Features
• Great flexibility at a huge application area
• Detects movement of magnet in Z-axis (Red-Yellow-Green indicator)
• Fully automotive qualified
• AEC-Q100, grade 0
• Small form factor
• SSOP 16 (5.3mm x 6.2mm)
• Robust environmental tolerance
• Wide temperature range: -40°C to 150°C
Applications
The device is ideal for industrial applications like contactless rotary position sensing and robotics; automotive applications like steering wheel position sensing, transmission gearbox encoder, head light position control, torque sensing, valve position sensing and replacement of high end potentiometers.
Block Diagram
The functional blocks of this device are shown below:
Figure 2: AS5145 Automotive Rotary Encoder IC
VDD5V Mode_Index
VDD3V3
LDO 3.3V
Sin
Hall Array
Cos
&
Frontend
Amplifier
Mux
Ang
DSP
Mag
OTP Register
AS5145
PWM Interface
Absolute Interface
(SSI)
Incremental Interface
MagINCn MagDECn
PWM
DO CSn CLK PDIO DTEST1_A DTEST2_B
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ams Datasheet [v2-02] 2020-Nov-25
AS5145H/AS5145A/AS5145B − Pin Assignment
Pin Assignment
Figure 3: Pin Diagram (Top View)
MagINCn
1
MagDECn
2
DTest1_A
3
DTest2_B
4
NC
5
Mode_Index
6
.