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AS5132
360 Step (8.5 bit) Programmable High Speed Magnetic Rotary Encoder
1 General Description
The AS5132 is a contactless magnetic rotary encoder for accurate angular measurement over a full turn of 360 degrees. It is a systemon-chip, combining integrated Hall elements, analog frontend 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 serial output over the interface and as a pulse width modulated (PWM) signal. An additional U,V,W output can be used for a block commutation for a brushless DC motor. An incremental signal is available as an option. In addition to the angle information, the strength of the magnetic field is also available as a 5-bit code. A software programmable (OTP) zero position simplifies assembly as the zero position. The magnet does not need to be mechanically aligned.
2 Key Features
360º contactless angular position sensing
Figure 1. AS5132 Block Diagram
Two digital absolute outputs (8.5 bit): - Serial interface - PWM output
Incremental output with adjustable number of pulses BLDC Output UVW, selectable for 1,2,3,4,5,6 pole pairs Supports external PWM clock mode Static and dynamic pre-commutation feature User programmable zero position and sensitivity High speed: up to 72,900 rpm Direct measurement of magnetic field strength allows exact
determination of vertical magnet distance Incremental Outputs ABI Quadrature: 90ppr, step direction:
180ppr, fixed pulse width 360ppr 9-bit multi turn counter Wide magnetic field input range: 20 – 80 mT (typical) Wide temperature range: -40ºC to +150ºC Thin Small Pb-free package: SSOP 20 Fully automotive qualified to AEC-Q100, grade 0
3 Applications
The AS5132 is suitable for contactless rotary position sensing, rotary switches (human machine interface), AC/DC motor position control and Brushless DC motor position control.
VDD5V VDDP
AS5132
Test(3:0) COM/INC
Step Mode Commutation
Interface
Pre-Commutation
S U_A V_B W_I
DIR
TC GND
Hall Array & Frontend Amplifier
Tracking ADC & Angle Decoder
Mag
AGC
Zero Adder
Angle
OTP
PWM Decoder
Absolute Serial
Interface (SSI)
Diagnostic
PWM
DIO CSN CLK
Diag PROG
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AS5132
Datasheet - Contents
Contents
1 General Description .................................................................................................................................................................. 1 2 Key Features............................................................................................................................................................................. 1 3 Applications............................................................................................................................................................................... 1 4 Pin Assignments ....................................................................................................................................................................... 3
4.1 Pin Descriptions.................................................................................................................................................................................... 3 5 Absolute Maximum Ratings ...................................................................................................................................................... 4 6 Electrical Characteristics........................................................................................................................................................... 5
6.1 Operating Conditions............................................................................................................................................................................ 5 6.2 System Parameters .............................................................................................................................................................................. 5 6.3 Magnet Specifications .......................................................................................................................................................................... 5 6.4 Programming Parameters .................................................................................................................................................................... 5 6.5 DC Characteristics of Digital Inputs...................................................................................................................................................... 6 6.6 DC Characteristics of Digital Outputs ................................................................................................................................................... 6 6.