AS5311 Demoboard
OPERATION MANUAL
Application note
1
General Overview
The AS5311 is a contactless high resolution magnetic linear encoder for accurate linear motion and off-axis rotary
sensing with a resolution down to <0.5µm. It is a system-on-chip, combining integrated Hall elements, analog front end
and digital signal processing on a single chip, packaged in a small 20-pin TSSOP package.
and digital signal processing on a single chip, packaged in a small 20-pin TSSOP package.
A multipole magnetic strip or ring with a pole length of 1.0mm is required to sense the rotational or linear motion. The
magnetic strip is placed above the IC at a distance of typ. 0.3mm.
A multipole magnetic strip or ring with a pole length of 1.0mm is required to sense the rotational or linear motion. The
magnetic strip is placed above the IC at a distance of typ. 0.3mm.
The absolute measurement provides instant indication of the magnet position within one pole pair with a resolution of
488nm per step (12-bit over 2.0mm). This digital data is available as a serial bit stream and as a PWM signal.
The absolute measurement provides instant indication of the magnet position within one pole pair with a resolution of
488nm per step (12-bit over 2.0mm). This digital data is available as a serial bit stream and as a PWM signal.
Furthermore, an incremental output is available with a resolution of 1.95 µm per step. An index pulse is generated once
for every pole pair (once per 2.0mm).The travelling speed in incremental mode is up to 650mm/second.
Furthermore, an incremental output is available with a resolution of 1.95 µm per step. An index pulse is generated once
for every pole pair (once per 2.0mm).The travelling speed in incremental mode is up to 650mm/second.
An internal voltage regulator allows the AS5311 to operate at either 3.3 V or 5 V supplies.
An internal voltage regulator allows the AS5311 to operate at either 3.3 V or 5 V supplies.
Depending on the application the AS5311 accepts multi-pole strip magnets as well as multi-pole ring magnets, both
radial and axial magnetized.
Depending on the application the AS5311 accepts multi-pole strip magnets as well as multi-pole ring magnets, both
radial and axial magnetized.
2
The AS5311 Demoboard
2
The AS5311 Demoboard
The AS5311 demoboard is a complete linear encoder system with built-in microcontroller, USB interface, graphical LCD
display, incremental indicators, incremental counter serial communication and PWM output LED.
The AS5311 demoboard is a complete linear encoder system with built-in microcontroller, USB interface, graphical LCD
display, incremental indicators, incremental counter serial communication and PWM output LED.
The board is USB powered or externally supplied with a 9V battery for standalone operation.
The board is USB powered or externally supplied with a 9V battery for standalone operation.
J8: AS5311 status signals
connector and indicators
SW1: Encoder selection
- External (top)
- Onboard (bottom)
Slider with multipole
magnet (1mm pole length)
over AS5311
LCD display
9V battery connector
(standalone only)
USB plug
(power supply or PC communication)
Slider guide
J7: AS5311 inceremental
A/B and Index
connector and indicators
J6: External Encoder
SSI Connector
J4: PWM output
and indicator
S1: Incremental
counter reset switch
Figure 1: AS5311 Demoboard hardware with mounted magnet knob
Revision 1.0, 09 April 2009
Page 1 of 9
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