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PDF NSE-5310 Data sheet ( Hoja de datos )
| Número de pieza | NSE-5310 | |
| Descripción | Miniature Position Encoder | |
| Fabricantes | ams | |
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NSE-5310
Miniature Position Encoder with Zero
Reference and I²C Output
1 General Description
The TRACKER NSE-5310 is an incremental position sensor with on-
chip encoding for direct digital output. A Hall element array on the
chip is used to derive the incremental position of an external
magnetic strip placed above the IC at a distance of 0.3 mm (typ).
This sensor array detects the ends of the magnetic strip to provide a
zero reference point.
The integration of Hall-effect position sensors, analog front end and
digital signal processing on a single IC chip provides an ingeniously
small position sensor, without the need for external pulse counters.
Direct digital output is accessible over the serial interface using I²C
protocol.
The TRACKER NSE-5310 provides absolute position information
over the length of a magnet pole pair (2 mm). A user can count pole
pairs and achieve absolute position information over the entire length
of the magnet (essentially unlimited).
With better than 0.5 micron resolution, the TRACKER is a robust,
cost-effective alternative to miniature optical encoders. It can be
used as a linear or off-axis rotary encoder.
Figure 1. TRACKER NSE-5310 Block Diagram
2 Key Features
Direct digital output using I²C protocol
End-of-magnet detection for built-in zero reference
0.488 μm resolution
< 2 μm bi-directional repeatability
< ±10 µm absolute error
On-chip temperature sensor
Magnetic field strength monitor
Available in TSSOP-20
Custom packaging such as wafer-level chip scale packaging
can be provided. Minimum order quantities may apply.
RoHS compliant
3 Applications
The NSE-5310 is ideal for Micro-actuator and servo drive feedback,
Replacement for optical encoders, Optical and imaging systems,
Consumer electronics, Precision biomedical devices,
Instrumentation and automation, Automotive applications, and
Integrated closed-loop motion systems using New Scale’s
SQUIGGLE micro motor.
VDD5V
VDD3V3
LDO 3.3V
Linear Hall
Array
&
Frontend
Amplifier
Sin
Cos
AGC
NSE-5310
DSP
Pos
Mag
AGC
AGC
Temperature sensor
PWM
Interface
Absolute
Interface
(I2C)
OTP
Register
Programming
Parameters
Incremental
Interface
MagINCn
MagDECn
PWM
SDA
SCL
AO
CSn
Prog
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Revision 1.5
1 - 22
1 page  
NSE-5310
Datasheet - Electrical Characteristics
6 Electrical Characteristics
Table 3. Operating Conditions
Symbol
Parameter
VDD5V
VDD3V3
Positive I/O Supply Voltage
VDDD/ VDDA
TAMB
Isupp
Positive Core Supply Voltage
Ambient Temperature
Supply Current
Conditions
5V Operation via LDO
IO structure on VDD5V connected to
VDD3V3
5V Operation over LDO Internal
analog and digital supply
-40ºF to +275ºF
6.1 Magnet Input Specification
Table 4. Two Pole Cylindrical Diametrically Magnetized Source
Symbol
Parameter
Conditions
pL Pole Length
ppL
Pole Pair Length
Magnetic North & South Pole
pLV Pole Length Variation
% of ppL 2mm
Required vertical component of the
Bpk
Magnetic input field amplitude
magnetic field strength on the die’s
surface
BpkV
Magnetic input field variation
Amplitude variation over encoder
length
Btc
Magnetic Field Temperature Drift
Samarium Cobalt ReComa28
typ – 0.035 %/K
Boff
Magnetic offset
Constant magnetic stray field
Vabs Linear travelling speed
Absolute output
Min Typ
4.5 5.0
3 3.3
3 3.3
-40
16
Max
5.5
3.6
3.6
125
21
Min Typ
1
2
10
Max
±1.2
40
±2
-0.2
±5
see note below
Units
V
V
V
ºC
mA
Units
mm
mm
%
mT
%
%/K
mT
Note: There is no upper speed limit for the absolute outputs. With increasing speed, the distance between two samples increases. The trav-
elling distance between two subsequent samples can be calculated as:
sampling_dist = -v--
fs
where:
sampling_distance = travelling distance between samples in mm
v = travelling speed in mm/sec
fs = sampling rate in Hz
Pole crossings need to be tracked to calculate absolute position beyond one pole pair. The ability to differentiate pole crossings may be
a speed limiting factor in such cases.
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Revision 1.5
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5 Page 
NSE-5310
Datasheet - Application Information
8 Application Information
Figure 7. TRACKER NSE-5310 Evaluation Board
Figure 7 shows NSE-5310 mounted on a PCB with FPC connector for ease of handling. A multipole linear magnetic strip is positioned above the
sensor.
8.1 Hall Sensor Array
Eight Hall Sensor Front End cells are connected to two current summation busses which end into two Active Load circuits. The Hall elements are
arranged in an even linear array. The array is divided into four quadrants. For normal operation (position encoding), two opposite quadrants are
summed up differentially to neglect magnetic offsets. The 90 degree angular shift of the quadrant pairs produces 90 degree phase shifted SIN
and COS signals for a harmonic input signal provided by a diametrically magnetized source.
Table 9. Hall Sensor Array Characteristics
Symbol
Parameter
Conditions
Min Typ
Max Units
GArray
dArray
Array Gain
Array Length
Double output stage
5.226
2
mm
Figure 8. Hall Sensor FE Arrangement
A mag
N
S
2mm
Front End Double
Output Stages
Q0
H0 H1
Q1
H2 H3
Q2
H4 H5
Q3
H6 H7
CH0 SIN
CH1 COS
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