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PDF AS5311 Data sheet ( Hoja de datos )
| Número de pieza | AS5311 | |
| Descripción | High Resolution Magnetic Linear Encoder | |
| Fabricantes | ams | |
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AS5311
High Resolution Magnetic Linear Encoder
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
1.95µm 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).
Figure 1. AS5311 Block Diagram
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
Two 12-bit digital absolute outputs:
- Serial interface and
- Pulse width modulated (PWM) output
Incremental output with Index
“Red-Yellow-Green” indicators monitor magnet placement over
the chip
3 Applications
Micro-Actuator feedback
Servo drive feedback
Robotics
Replacement of optical encoders
VDD5V
VDD3V3
LDO 3.3V
Linear Hall
Array
&
Frontend
Amplifier
Sin
Cos
AS5311
Ang
DSP
Mag
OTP
Register
Programming
Parameters
PWM
Interface
Absolute
Interface
(SSI)
Incremental
Interface
MagINCn
MagDECn
PWM
DO
CSn
CLK
A
B
Index
Prog
www.ams.com/AS5311
Revision 1.12
1 - 29
1 page  
AS5311
Datasheet - Absolute Maximum Ratings
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only, and functional operation of
the device at these or any other conditions beyond those indicated in Electrical System Specifications on page 8 is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Parameter
DC supply voltage at pin VDD5V
DC supply voltage at pin VDD3V3
Input pin voltage
Input current (latchup immunity)
Electrostatic discharge
Storage temperature
Body temperature (Lead-free package)
Humidity non-condensing
Moisture Sensitive Level (MSL)
Min Max
-0.3 7
5
-0.3
VDD5V
+0.3
-100 100
±2
-55 125
260
5 85
3
Units
V
V
V
mA
kV
°C
°C
%
Comments
Except VDD3V3
Norm: JEDEC 78
Norm: MIL 883 E method 3015
Min – 67°F; Max +257°F
The reflow peak soldering temperature (body
temperature) specified is in accordance with IPC/
JEDEC J-STD-020C “Moisture/Reflow Sensitivity
Classification for Non-Hermetic Solid State Surface
Mount Devices”.
The lead finish for Pb-free leaded packages is matte tin
(100% Sn).
Represents a maximum floor time of 168h
www.ams.com/AS5311
Revision 1.12
5 - 29
5 Page 
AS5311
Datasheet - Detailed Description
7.1 Incremental Outputs
Figure 4 shows the two-channel quadrature output of the AS5311. Output A leads output B when the magnet is moving from right to left and
output B leads output A when the magnet is moving from left to right(see Figure 14).
Figure 4. Incremental Outputs
Incremental outputs
A
B
Index
CSn
tIncremental outputs valid
Mechanical
Zero Position
Movement Direction
Change
Mechanical
Zero Position
Index=0
1LSB
Movement right to left
Hyst =
2 LSB
Movement left to right
7.1.1 Incremental Power-up Lock Option
After power-up, the incremental outputs can optionally be locked or unlocked, depending on the status of the CSn pin:
CSn = low at power-up: CSn has an internal pull-up resistor and must be externally pulled low (Rext ≤ 5kΩ). If Csn is low at power-up, the
incremental outputs A, B and Index will be high until the internal offset compensation is finished. This unique state may be used as an indicator
for the external controller to shorten the waiting time at power-up. Instead of waiting for the specified maximum power up-time (see Electrical
System Specifications on page 8), the controller can start requesting data from the AS5311 as soon as the state (A= B= Index = high) is cleared.
CSn = high or open at power-up: In this mode, the incremental outputs (A, B, Index) will remain at logic high state after power-up, until
CSn goes low or a low pulse is applied at CSn and internal offset compensation is finished. This mode allows intentional disabling of the
incremental outputs after power-up until for example the system microcontroller is ready to receive data.
Once the incremental outputs are unlocked they can not be disabled during operation.
www.ams.com/AS5311
Revision 1.12
11 - 29
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| PDF Descargar | [ Datasheet AS5311.PDF ] | |
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