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.
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.
Figure 1. TRACKER NSE-5310 Block Diagram
VDD3V3
MagINCn
MagDECn
Pos
Mag
VDD5V
LDO 3.3V
Sin
Cos
PWM
Interface
PWM
SDA
DSP
Linear Hall
Array
&
Frontend
Amplifier
AGC
AGC
Temperature sensor
AGC
Absolute
Interface
(I
2
C)
SCL
AO
CSn
OTP
Register
NSE-5310
Programming
Parameters
Incremental
Interface
Prog
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NSE-5310
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
NC
MagIncrn
MagDecrn
DTest1_A
DTest2_B
TestCoil
Mode_Index
VSS
PDIO
NC
1
2
3
4
5
6
7
8
9
10
20
19
18
17
TestBus3
VDD5V
VDD3V3
TestBus0
TestBus1
PWM
CSn
SCL / CLK
SDA / DIO
I2C_A0
NSE-5310
16
15
14
13
12
11
4.1 Pin Descriptions
Table 1. Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
9
10
11
Pin Name
NC
MagINCn
MagDECn
DTEST1_A
DTEST2_B
Coil
Mode_Index
VSS
PDIO
NC
I2C A0
Analog I/O
Digital I/O with pull-down
Digital output open drain
Supply pad
Digital I/O
Analog I/O
Digital output open drain
Pin Type
Not Connected
Indicates increasing or decreasing of magnitude by the AGC.
Can be used for Push Button Function. Both signals are active
low if AGC is in Non Valid Range and can be hooked together in
wired-AND Non Valid X / Y Alignment during Align Mode
Test output in default mode, A in sync mode
Test output in default mode, B in sync mode
Serial connection of Hall Element Coils to VSS
Decimation Rate Selection internal pull down, by default DCR =
256. Static setup at power up.
Ground
Digital and Analog Access to PPTRIM
Not connected
Digital input to choose I²C address by input pin.
This pin is
Digital input with pull-down the I²C address pin (0 or 1) to select the position sensor when two
sensors are used.
Description
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NSE-5310
Datasheet - P i n A s s i g n m e n t s
Table 1. Pin Descriptions
Pin Number
Pin Name
Pin Type
Description
DATA Input / Output for I²C Mode.
This pin is the I2C serial
interface used to read direct position information. This pin can
also be used to read the absolute magnitude of the magnetic field
(used to detect the end of the magnet, as a zero reference), and
the temperature sensor information.
See I²C User Interface on
page 12
for more information.
Serial Interface Unit CLK, also used for PPTIM access.
Frequency up to 400 KHz.
ChipSelect / DO tristate / Reset Device in TestEN Mode / Control
Mode at PPTIM access
~200 Hz Pulse Width Modulation Absolute Output
Analog Test Bus1 / Configurable IO
Analog Test Bus0 / Configurable IO
LDO Output.
Positive I/O supply voltage pin.
See Using 3.3V or 5V Operation on page 10
for more
information.
LDO Input / Connection to IO structure.
Positive I/O supply
voltage pin.
See Using 3.3V or 5V Operation on page 10
for more
information.
Analog Test Bus3 / Configurable IO
12
SDA (DO)
Digital I/O / Tristate
13
14
15
16
17
18
SCL (CLK)
CSn
PWM
TestBus1
TestBus0
VDD3V3
Digital input
Digital input with pull-up
Digital output
Analog I/O
Supply pad
19
20
VDD5V
TestBus3
Analog I/O
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NSE-5310
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
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 Characteristics on page 5
is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Symbol
V
IN
VDD5V
V
IN
VDD3V3
VDD
V
IN
V
IN
VDD3V3
I
scr
ESD
T
strg
Parameter
DC Supply Voltage at pin VDD5V
DC Supply Voltage at pin VDD3V3
DC Supply Voltage
Input Pin Voltage
Input Pin Voltage VDD3V3
Input Current (latchup immunity)
Electrostatic Discharge
Storage Temperature (TSSOP)
-55
-100
Min
-0.3
Max
7
5
7
VDD+ 0.3
5
100
±2
125
Units
V
V
V
V
V
mA
kV
ºC
Norm: IPC/JEDEC J-STD-020.
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”.
Norm: Jedec 78
Norm: MIL 883 E method 3015
Except VDD3V3
Comments
T
body
Body temperature (Lead-free package)
260
ºC
Humidity non-condensing
R
th
MSL
Thermal Package Resistance
Moisture Sensitivity Level
5
3
85
114.5
%
ºC/W
Represents a maximum floor time of 168h
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NSE-5310
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
Table 3. Operating Conditions
Symbol
VDD5V
VDD3V3
VDDD/ VDDA
T
AMB
I
supp
Positive I/O Supply Voltage
Positive Core Supply Voltage
Ambient Temperature
Supply Current
Parameter
Conditions
5V Operation via LDO
IO structure on VDD5V connected to
VDD3V3
5V Operation over LDO Internal
analog and digital supply
-40ºF to +275ºF
Min
4.5
3
3
-40
16
Typ
5.0
3.3
3.3
Max
5.5
3.6
3.6
125
21
Units
V
V
V
ºC
mA
6.1 Magnet Input Specification
Table 4. Two Pole Cylindrical Diametrically Magnetized Source
Symbol
pL
ppL
pLV
B
pk
B
pk
V
B
tc
B
off
Vabs
Parameter
Pole Length
Pole Pair Length
Pole Length Variation
Magnetic input field amplitude
Magnetic input field variation
Magnetic Field Temperature Drift
Magnetic offset
Linear travelling speed
Magnetic North & South Pole
% of ppL 2mm
Required vertical component of the
magnetic field strength on the die’s
surface
Amplitude variation over encoder
length
Samarium Cobalt ReComa28
typ – 0.035 %/K
Constant magnetic stray field
Absolute output
see note below
10
Conditions
Min
Typ
1
2
±1.2
40
±2
-0.2
±5
Max
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:
v
-
sampling_dist =
---
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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