Revision 1.1, 07.October 2009
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1
General Overview
The AS5132 is a contactless magnetic rotary encoder for accurate angular measurement over a full turn of
360º. 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 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 a serial bit stream and as a
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 if 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.
To optimize the torque characteristic at a certain speed the AS5132 has the option to use a static or dynamic pre-
commutation.
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The AS5132 Demoboard
The AS5132 demoboard is a complete rotary encoder system with built-in microcontroller, USB interface, graphical LCD
display, incremental indicators, commutation indicators and PWM output LED.
The board is USB powered or externally supplied with a 9V battery for standalone operation. For this Demoboard the
AS5132 is configured with UVW Output.
Figure 1: AS5132 Demoboard hardware with mounted magnet knob
AS5132
8 BIT PROGRAMMABLE HIGH SPEED
MAGNETIC ROTARY ENCODER
AS5132-DB-1.0 Demoboard
OPERATION MANUAL
LCD display (for standalone mode)
AS5134 output signals connector and indicators
UVW commutation LEDs
USB cable to the PC
9V battery connector
(standalone only)
Knob with D5x2.5mm
diametral magnet,
2mm over the AS5134
SiLabs C8051C320
microcontroller
*Switch INT - EXT
ams
AG
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