AS5311 Datasheet, PDF (1/23 Pages) ams AG – High Resolution Magnetic Linear Encoder

AS5311
Data Sheet
AS5311
High Resolution Magnetic Linear Encoder
Preliminary Data Sheet
1 General Description
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.
A multi-pole 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.
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.
Depending on the application the AS5311 accepts
multi-pole strip magnets as well as multi-pole ring
magnets, both radial and axial magnetized (see
Figure 1 and Figure 3).
The AS5311 is available in a Pb-free TSSOP-20
package and qualified for an ambient temperature
range from -40°C to +125°C.
2 Key Features
ƒ Two 12-bit digital absolute outputs :
- Serial interface and
- Pulse width modulated (PWM) output
ƒ Incremental output with Index
ƒ “red-yellow-green” indicators monitor magnet
placement over the chip
3 Applications
ƒ Micro-Actuator feedback
ƒ Servo drive feedback
ƒ Robotics
ƒ Replacement of optical encoders
Figure 1: AS5311 with Multi-pole Magnetic Strip
for Linear Motion Sensing
VDD5V
Figure 2: Block Diagram of AS5311
VDD3V3
Sin
Ang
Cos
Mag
MagINCn
MagDECn
PWM
DO
CSn
CLK
A
B
AS5311
Index
Prog
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