Datasheet

NSE-5310
Miniature Position Encoder with Zero
Reference and I²C Output
1 General Description
2 Key Features
Direct digital output using I²C protocol
The TRACKER NSE-5310 is an incremental position sensor with onchip 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.
End-of-magnet detection for built-in zero reference
0.488 μm resolution
< 2 μm bi-directional repeatability
< ±10 µm absolute error
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.
On-chip temperature sensor
Magnetic field strength monitor
Available in TSSOP-20
Custom packaging such as wafer-level chip scale packaging
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).
can be provided. Minimum order quantities may apply.
RoHS compliant
3 Applications
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.
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
VDD5V
MagINCn
MagDECn
LDO 3.3V
Sin
DSP
AGC
Pos
AGC
Temperature sensor
PWM
SDA
Mag
Cos
Linear Hall
Array
&
Frontend
Amplifier
PWM
Interface
AGC
Absolute
Interface
(I2C)
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
1
20
TestBus3
MagIncrn
2
19
VDD5V
MagDecrn
3
18
VDD3V3
DTest1_A
4
17
TestBus0
DTest2_B
5
16
TestBus1
TestCoil
6
15
PWM
Mode_Index
7
14
CSn
VSS
8
13
SCL / CLK
PDIO
9
12
SDA / DIO
10
11
I2C_A0
NC
NSE-5310
4.1 Pin Descriptions
Table 1. Pin Descriptions
Pin Number
Pin Name
1
NC
2
MagINCn
3
MagDECn
4
DTEST1_A
Test output in default mode, A in sync mode
5
DTEST2_B
Test output in default mode, B in sync mode
6
Coil
Analog I/O
7
Mode_Index
Digital I/O with pull-down
Digital output open drain
8
VSS
Supply pad
Ground
9
PDIO
Digital I/O
Analog I/O
Digital and Analog Access to PPTRIM
10
NC
11
I2C A0
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Pin Type
Description
Not Connected
Digital output open drain
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
Serial connection of Hall Element Coils to VSS
Decimation Rate Selection internal pull down, by default DCR =
256. Static setup at power up.
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.
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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.
12
SDA (DO)
Digital I/O / Tristate
13
SCL (CLK)
Digital input
14
CSn
Digital input with pull-up
15
PWM
Digital output
16
TestBus1
17
TestBus0
18
VDD3V3
Analog I/O
Supply pad
19
VDD5V
20
TestBus3
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Analog I/O
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
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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
Parameter
Min
Max
Units
VINVDD5V
DC Supply Voltage at pin VDD5V
-0.3
7
V
VINVDD3V3
DC Supply Voltage at pin VDD3V3
5
V
VDD
DC Supply Voltage
7
V
VIN
Input Pin Voltage
VDD+ 0.3
V
VINVDD3V3
Input Pin Voltage VDD3V3
5
V
Iscr
Input Current (latchup immunity)
100
mA
Norm: Jedec 78
ESD
Electrostatic Discharge
±2
kV
Norm: MIL 883 E method 3015
Tstrg
Storage Temperature (TSSOP)
125
ºC
Tbody
-55
Body temperature (Lead-free package)
Humidity non-condensing
Rth
Thermal Package Resistance
MSL
Moisture Sensitivity Level
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-100
5
260
ºC
85
%
114.5
ºC/W
3
Revision 1.5
Comments
Except VDD3V3
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”.
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
Parameter
VDD5V
Conditions
Min
Typ
Max
Units
5V Operation via LDO
4.5
5.0
5.5
V
Positive I/O Supply Voltage
IO structure on VDD5V connected to
VDD3V3
3
3.3
3.6
V
VDDD/ VDDA
Positive Core Supply Voltage
5V Operation over LDO Internal
analog and digital supply
3
3.3
3.6
V
TAMB
Ambient Temperature
-40ºF to +275ºF
-40
125
ºC
Isupp
Supply Current
16
21
mA
Typ
Max
Units
VDD3V3
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
Bpk
Magnetic input field amplitude
Required vertical component of the
magnetic field strength on the die’s
surface
BpkV
Magnetic input field variation
Btc
Min
1
mm
2
mm
±1.2
%
40
mT
Amplitude variation over encoder
length
±2
%
Magnetic Field Temperature Drift
Samarium Cobalt ReComa28
typ – 0.035 %/K
-0.2
%/K
Boff
Magnetic offset
Constant magnetic stray field
±5
mT
Vabs
Linear travelling speed
Absolute output
10
see note below
Note: There is no upper speed limit for the absolute outputs. With increasing speed, the distance between two samples increases. The travelling 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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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
6.2 Electrical System Specifications
Table 5. Electrical System Specifications
Symbol
Parameter
Conditions
RES
Resolution
INLopt
Max
Units
0.48828125 µm (max. 2mm/4096)
12
bit
Integral non-linearity (optimum)
Maximum error with respect to the
best line fit.
Ideal magnet, TAMB=25ºC
±5.6
µm
INLtemp
Integral non-linearity (over temperature)
Maximum error with respect to the
best line fit.
Ideal magnet, TAMB= -30 to +70ºC
±10
µm
INL
Integral non-linearity
Best line fit =(Errmax– Errmin)/2
including magnet error,
TAMB= -30 to +70ºC
±40
µm
DNL
Differential non-linearity
10bit, no missing codes
±0.97
µm
TN
Transition noise
tPwrUp
Power-up time
tdelay
System propagation delay
fS
1
Internal sampling rate for absolute
output:
Min
Typ
1 sigma, fast mode
0.6
1 sigma, slow mode
0.3
Fast mode until status bit OCF=1
20
Slow mode
80
Fast mode (MODE=1)
96
Slow mode (MODE=0 or open)
384
TAMB=25ºC, slow mode
2.48
2.61
2.74
TAMB= -30 to +70ºC, slow mode
2.35
2.61
2.87
TAMB=25ºC, fast mode
9.90
10.42
10.94
TAMB= -30 to +70ºC, fast mode
9.38
10.42
11.46
µm RMS
ms
µs
kHz
Hyst
Hysteresis
Incremental output /12bit resolution
Hyst=0 for absolute serial output
2
8
LSB
tPwrUp
Power Up Time
Mode dependant
20
80
ms
CLK
I²C Read-out frequency
Maximum clock frequency to read out
serial data
800
kHz
400
1. System integral non linearity is limited by magnetic source.
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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
6.3 DC/AC Characteristics for Digital Inputs and Outputs
Table 6. CMOS Input, CMOS Input Pull Down, CMOS Input Pull Up
Symbol
Parameter
Conditions
VIH
High Level Input Voltage
VIL3V3
Low Level Input Voltage
VIH
High Level Input Voltage
VIL3V3
Low Level Input Voltage
ILEAK
Input Leakage Current CMOS Input
-1
+1
µA
ILEAKLOW
Input Leakage Current CMOS Input Pull
up
-30
-100
µA
ILEAKHIGH
Input Leakage Current CMOS Input Pull
down
30
100
µA
Max
Units
Operating range VDD5V
Operating range VDD3V3
Min
Typ
Max
1.6
0.4
1.3
0.4
Units
V
V
Table 7. CMOS Output
Symbol
Parameter
Conditions
Min
VOH
High Level Output Voltage
DVDD: Positive I/O Supply Voltage
DVDD
-0.5
VOL
Low Level Output Voltage
DVSS: Negative Supply Voltage
CL
IO
Typ
V
DVSS
+0.4
V
Capacitive Load
50
pF
Output Current
4
mA
Max
Units
Table 8. Tristate CMOS Output
Symbol
Parameter
Conditions
Min
VOH
High Level Output Voltage
DVDD: Positive I/O Supply Voltage
DVDD
-0.5
VOL
Low Level Output Voltage
DVSS: Negative Supply Voltage
DVSS
+0.4
V
IOZ
Tristate Leakage Current
to DVDD and DVSS
1
µA
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Revision 1.5
Typ
V
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NSE-5310
Datasheet - D e t a i l e d D e s c r i p t i o n
7 Detailed Description
The TRACKER measures the spatially varying magnetic field produced by moving a multi-pole magnetic strip over a Hall sensor array on the
NSE-5310 chip (see Figure 3). The internal sinusoidal (SIN) and phase-shifted sinusoidal (COS) signals are filtered and transformed into angle
(ANG) and magnitude (MAG), representing the absolute linear position within a 2 mm pole pair on the magnet. Interpolation with 12 bit (4096)
resolution yields 0.5 µm position resolution. Automatic gain control (AGC) adjusts for DC bias in the magnetic field and provides a large
magnetic field dynamic range for high immunity to external magnetic fields. The absolute magnitude of the magnetic field intensity is used to
detect the end of the magnetic strip and serves as a built-in zero reference. The length of the magnetic strip determines the maximum measured
stroke.
Note: Hall sensor array and on-chip digital encoder yield absolute position within a pole pair. Use a system processor to count pole pair
crossings for long-range absolute position.
Figure 3. Hall Sensor Array
90° Sine
0. 488 µm Resolution 4096 Counts / 2 mm (Counts / 360°)
Mag
2 mm per N- S Pair
ϕ
Moving Magnet
N S
N
S
0°
180°
N S
Hall Sensor Array
Cos
270°
-Sine
Sine
DSP
Cos
+Cos
-Cos
Angle (ϕ)
Sine
+Sine
Magnitude
Cos
Amplifier with
Automatic Gain
Control
ADC
Digital Filter
The over travel pole crossing provides a precision home position and eliminates the need for a secondary zero reference sensor.
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NSE-5310
Datasheet - D e t a i l e d D e s c r i p t i o n
Figure 4. Magnetic Field Strength Used to Indicate End of Travel
Normal Magnitude in Travel Range
Magnet Field Strength Used to
Indicate End of Travel
Direction of Travel
Magnet Field Strength
“Magnitude”
N
N
Reduced Magnitude Detected
N
N
Normal Field
Strength in
Travel Range
Direction of Travel is Reversed
Reduced Field Strength
S
S
S
S
in Over-Travel Range
Returns Home last pole crossing
Angle (ϕ) = 0
Travel Range
Hall Sensor Array
TSSOP Package
Over Travel
1 ½ poles either end
Hall Array Center Line
A system controller and user-supplied flash memory with the TRACKER NSE-5310 provide for long-range absolute position information that is
retained during sleep mode or power-down.
Figure 5. Example of Absolute long-range position information with use of external flash memory and controller
S
S
S
N
S
N
N
N
Seiko Magnets
2 mm Pole Pair
Zero Ref
1 - 1/2 poles
From End
Zero Ref
1 - 1/2 poles
From End
6 mm working range
6000
Over
Overtravel
travel
area
areaused
used
Cummulative
TRACKER
Readings
(microns)
4000
2000
0
2000
0
1
2
3
4
5
6
0
1
2
3
4
5
6
1500
TRACKER
Readings 1000
(microns)
500
0
System Controller
Flash Memory
Tracks
TracksPole
PoleCrossing
Crossing (0
(0 to
to6)6)and
and
absolute
absoluteposition
position within
within aapole
pole
pair
pair
2000micron
micronrange
range
toto0.5
0.5 microns,
microns, 2000
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Pole Crossings
Pole crossing retained in User
- Supplied Flash
Memory during sleep mode or shut down
for retrieval during power up
Revision 1.5
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NSE-5310
Datasheet - D e t a i l e d D e s c r i p t i o n
7.1 Using 3.3V or 5V Operation
For 3.3V operation: Bypass the voltage regulator (LDO) by connecting VDD3V3 with VDD5V.
For 5V operation: Connect the 5V supply to pin VDD5V. VDD3V3 (LDO output) must be buffered by a 2.2µF to 10µF capacitor placed close to
the supply pin.
In either case, a buffer capacitor of 100nF close to pin VDD5V is recommended.
Note: Pin VDD3V3 must always be buffered by a capacitor. It must not be left floating, as this may cause an instable internal 3.3V supply voltage which may lead to larger than normal jitter of the measured position.
The 3V3 output is intended for internal use only. It must not be loaded with an external load.
The output voltage of the digital interface I/Os corresponds to the voltage at pin VDD5V, as the I/O buffers are supplied from this pin.
Figure 6. Connections for 3.3V or 5V Supply Voltage
5V Operation
3.3V Operation
1... 10µF
VDD3V3
VDD3V3
100n
100n
VDD5V
LDO
Internal
VDD
VDD5V
LDO
Internal
VDD
DO
3.0 - 3.6V
VSS
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I
N
T
E
R
F
A
C
E
PWM
DO
+
-
-
+
4.5 - 5.5V
CLK
CSn
Prog
VSS
Revision 1.5
I
N
T
E
R
F
A
C
E
PWM
CLK
CSn
Prog
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NSE-5310
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
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
GArray
Array Gain
Double output stage
dArray
Array Length
Typ
Max
Units
5.226
2
mm
Figure 8. Hall Sensor FE Arrangement
A mag
N
S
2mm
Q0
H0
Q1
H1
H2
Q2
H3
H4
Front End Double
Output Stages
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Revision 1.5
Q3
H5
H6
H7
CH0
SIN
CH1
COS
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NSE-5310
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
8.2 Automatic Gain Control (AGC)
As the magnetic input field varies non-linearly with the air gap between sensor and magnet, the gain is controlled to an optimum input signal for
the SD ADC. The magnitude output is compared to a target register value. The most significant eight bits are used. If the actual magnitude differs
from the target value, an UP/DOWN signal for the AGC counter signal is generated.
For air gap detection functionality, two magnitude-change outputs are derived from the AGC counter UP/DOWN signals while the loop is
controlling the amplitude back to the target amplitude. Magnitude Increasing (MagINCn) and Magnitude Decreasing (MagDECn) signals indicate
air gap (SIN/COS amplitude) changes. Both signals are high for saturation of the AGC counter (running into upper / lower limit) and produce a
Non-Valid-Range alarm. The output pins can be connected together in wired-OR configuration to produce a single NVRn bit. For faster power-up
and response time, a successive approximation algorithm is implemented.
8.3 Temperature Sensor
The Temperature Sensor provides the junction temperature information over the serial interface.
Table 10. Temperature Sensor Characteristics
Parameter
Conditions
Absolute Error Trimmed
Min
Typ
Max
Units
See I²C User Interface on page 12
±10
ºC
Conversion Rate
For continuous readout
(1303 clock cycles between conversion)
767
sample/s
Temperature Range
Specified temperature range
-30
70
ºC
Readout Range
Design limit for temperature range
-50
80
ºC
Resolution
Temp [ºC] = output code [LSB] x 0.667 [ºC/LSB] 75[ºC]
Clock Frequency
System clock (4 MHz) divided by 4
8
bit
0.667
ºC/LSB
1
MHz
8.4 I²C User Interface
The device is accessible via an I2C two-wire serial interface. The default address is A<6:0>1000000. A<5:1> can be defined by the OTP I2C
Address. A0 can be selected by pulling up pin 11 (default internal pull down). CSn (default internal pull up) must be low during I²C data
transmission.
Figure 9. I²C Read Out by an µC-Master
Type Identifier
1
SDA
1
SCL
S
A5 A4
A3
Address
Read
A2 A1 A0p R/
D11 D10 D9 D8 D7 D6 D5 D4
9
ACK
Address
by Slave
D3 D2 D1 D0
9
1
Data Byte 1
Mag
Offset cordic
Lin
Incr
Comp Over
Alarm
Decr
Finish Flow
1
ACK
Master
AGC7
9
Data Byte 2
ACK
Master
1
Data
Byte 3
D11 - D0: Linear position
Offset Compensation Finished: “high” indicates a data valid.
CORDIC OverFlow: “high” indicates a DSP calculation overflow.
Linearity Alarm: “high” indicates the ADC input range exceeds ±625mV (=Filter OverFlow)
MagIncr / MagDecr “high” OR connection indicates changing magnitude and non-valid input range (see also pin 2 and 3)
In addition to the position data, magnitude and temperature sensor information can be read out as described in Automatic Gain Control (AGC) on
page 12 and Temperature Sensor on page 12.
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Revision 1.5
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NSE-5310
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Figure 10. I²C Additional Information – Magnitude and Temperature Sensor
SDA
Mag
Incr
Decr
AGC7AGC6AGC5AGC4AGC3AGC2AGC1AGC0
9
SCL
1
ACK
Master
Data Byte 2
Mag7 Mag6Mag5 Mag4Mag3Mag2Mag1Mag0
9
Data Byte 3
1
TD9 TD8 TD7 TD6 TD5 TD4 TD3 TD2
9
ACK
Master
Data Byte 4
ACK
Master
9
1
Data Byte 5
ACK
Master
P
AGC7- AGC0: Automatic Gain Control data
Mag7- Mag0: MSB magnitude value
TD9 - TD2: MSB temperature data
The information is sequenced by the order of priority during operation. Hence temperature readout is not needed for every access and
magnitude information is only important if the AGC is out of range. The I²C readout can be stopped after every byte with the stop condition P.
Timing constraints are according to I2C-Bus Specification V2.1 / 2000.
8.4.1
Sync Mode
This mode is used to synchronize the external electronics with the NSE-5310. In this mode two signals are provided at the pins DTEST_A and
DTEST_B.
To activate sync mode, the internal trim bit for Sync Mode must be set. Please refer to Application Note AN5310-10.
Figure 11. Sync Mode
Data _ PhaseA
Data_PhaseB
Data_PhaseA
DTEST 1 _ A
DTEST 2 _ B
96 µs
Every rising edge at DTEST1_A indicates that new data in the device is available. With this signal it is possible to trigger a µC (interrupt) and
start the serial interface readout.
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Revision 1.5
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NSE-5310
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
8.5 Z-axis Range Indication (“Red/Yellow/Green” Indicator)
The NSE-5310 provides several options of detecting the magnet distance by indicating the strength of the magnetic field. Signal indicators
MagINCn and MagDECn are available both as hardware pins (pins 2 and 3) and as status bits in the serial data stream (see Figure 9).
Additionally the LIN status bit indicates the non-recommended “red” range.
The digital status bits MagINC, MagDec, LIN and the hardware pins MagINCn, MagDECn have the following function:
Table 11. Magnetic Field Strength Red-Yellow-Green Indicators
Status Bits
MAG
Hardware Pins
Mag
INC
Mag
DEC
Lin
M11…
M0
Mag
INCn
Mag
DECn
0
0
0
3F hex
OFF
OFF
No distance change
Magnetic input field OK (GREEN range, ~10-40mT peak amplitude)
0
1
0
3F hex
OFF
OFF
Distance increase; this state is a dynamic state and only active while the
magnet is moving away from the chip. Magnitude register may change
but regulates back to 3F hex.
1
0
0
3F hex
OFF
OFF
Distance decrease; this state is a dynamic state and only active while the
magnet is moving towards the chip. Magnitude register may change but
regulates back to 3F hex.
1
1
0
20 hex - 5F
hex
ON
OFF
YELLOW range: magnetic field is ~3.4-4.5mT.
The device may still be operated in this range, but with slightly reduced
accuracy.
1
1
1
<20 hex
>5F hex
ON
ON
RED range: magnetic field is <3.4mT (MAG <20) or >54.5mT
(MAG >5F). It is still possible to operate the device in the red range, but
not recommended.
Description
8.6 Pulse Width Modulation (PWM) Output
The NSE-5310 also provides a pulse width modulated output (PWM), whose duty cycle is proportional to the relative linear position of the
magnet within one pole pair (2.0 mm). This cycle repeats after every subsequent pole pair:
t on ⋅ 4098
-–1
Position = ----------------------( t on + t off )
(EQ 1)
Where:
Digital position = 0 – 4094
Exception: A linear position of 1999.5µm = digital position 4095 will generate a pulse width of tON = 4097µs and a pause tOFF = 1µs
The PWM frequency is internally trimmed to an accuracy of ±5% (±10% over full temperature range). This tolerance can be cancelled by
measuring the complete duty cycle as shown above.
Operating Conditions: TAMB = -40 to +125ºC, VDD5V = 3.0~3.6V (3V operation) VDD5V = 4.5~5.5V (5V operation) unless otherwise noted.
Table 12. PWM Output Timing Considerations
Symbol
fPWM
Parameter
PWM frequency
Conditions
Min
Typ
Max
Signal period = 4098µs ±5% at
TAMB=25ºC
232
244
256
= 4098µs ±10% at
TAMB= -40 to +125ºC
220
244
268
Units
Hz
PWMIN
Minimum pulse width
Position 0d = 0µm
0.9
1
1.1
µs
PWMAX
Maximum pulse width
Position 4095d = 1999.5µm
3892
4097
4301
µs
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Revision 1.5
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NSE-5310
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Figure 12. PWM Output Signal
Position
PWMIN
0 µm
(Pos 0)
1µs
4098µs
PWMAX
1999.5 µm
(Pos 4095)
4097µs
1/fPWM
8.7 Magnetic Strip Requirements
The NSE-5310 requires a magnetic strip with alternate poles (North-South) of pole length of 1 mm and pole pair length of 2 mm. A half pole is
required at each end of the strip. The length of the strip determines the maximum measured stroke; it must be 3 mm greater than the stroke in 1
mm increments (1.5 mm on each end).
A circular magnet may be used to achieve off-axis rotary encoding.
Table 13. Magnetic Strip Requirements
8.7.1
Parameter
Value
Note
Pole length
1 mm
Pole pair length
2 mm ± 1.2%
Accuracy of magnetic pole length determines accuracy of linear
measurement
Magnetic strip length
Stroke + 3 mm
The magnet strip must be in 1 mm increments. A ½ pole is required
at each end.
Magnetic strip area
1 mm X 2 mm
Size recommended for TSSOP package
Magnetic field temp drift
-0.2%/K max
Recommended - for example Samarium Cobalt ReComa28 is 0.035%/K
Mounting the Magnet
Vertical Distance: As a rule of thumb, the gap between chip and magnet should be ½ of the pole length, that is Z=0.5mm for the 1.0mm pole
length of the magnets. However, the gap also depends on the strength of the magnet. The NSE-5310 automatically adjusts for fluctuating
magnet strength by using an automatic gain control (AGC). The vertical distance should be set such that the NSE-5310 is in the “green” range.
See Z-axis Range Indication (“Red/Yellow/Green” Indicator) on page 14 for more details.
Alignment of Multi-pole Magnet and IC: When aligning the magnet strip or ring to the NSE-5310, the centerline of the magnet strip should
be placed exactly over the Hall array. A lateral displacement in Y-direction (across the width of the magnet) is acceptable as long as it is within
the active area of the magnet. The active area in width is the area in which the magnetic field strength across the width of the magnet is constant
with reference to the centerline of the magnet.
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NSE-5310
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Lateral Stroke of Multi-pole Strip Magnets: The lateral movement range (stroke) is limited by the area at which all Hall sensors of the IC
are covered by the magnet in either direction. The Hall array on the NSE-5310 has a length of 2.0mm, hence the total stroke is:
maximum lateral Stroke = Length of active area – length of Hall array
(EQ 2)
Note: Active area in length is defined as the area containing poles with the specified 1.0mm pole length. Shorter poles at either edge of the
magnet must be excluded from the active area.
Figure 13. Magnetic Strip Alignment
Note: Further examples including use in off-axis rotary applications are shown in the “Magnet Selection Guide”, available for download at
www.ams.com/eng/content/view/download/11922
Figure 14. Vertical Cross Section
3.200±0.235
2.576±0.235
0.2299±0.100
0.2341±0.100
Package
Outline
0.7701±0.150
Die C/L
3.0475±0.235
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NSE-5310
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
9 Package Drawings and Markings
Figure 15. 20-pin TSSOP Package
Symbol
A
A1
A2
b
c
D
E
E1
e
L
L1
R
R1
S
θ1
θ2
θ3
aaa
bbb
ccc
ddd
N
NST
NSE-5310
@
YYWWMZZ
Min
0.05
0.80
0.19
0.09
6.40
4.30
0.45
0.09
0.09
0.20
0°
-
Nom
1.00
6.50
6.40 BSC
4.40
0.65 BSC
0.60
1.00 REF
12 REF
12 REF
0.10
0.10
0.05
0.20
20
Max
1.20
0.15
1.05
0.30
0.20
6.60
4.50
0.75
8°
-
Notes:
1. Dimensions & Tolerancing confirm to ASME Y14.5M-1994.
2. All dimensions are in millimeters. Angles are in degrees.
Marking: YYWWMZZ.
YY
WW
M
ZZ
@
Year
Manufacturing Week
Plant Identifier
Traceability Code
Sublot Identifier
JEDEC Package Outline Standard: MO - 153
Thermal Resistance Rth(j-a): 89 K/W in still air, soldered on PCB
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NSE-5310
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
The evaluation kit includes an NSE-5310 mounted in a TSSOP 20 package with flex cable, for easy handling during evaluation and system
development. The TRK-1T02-E evaluation pack includes a TRK-1T02 along with a suitable linear magnetic strip, a MC-31MB interface card and
New Scale Pathway™ software with intuitive user interface to facilitate evaluation.
Figure 16. TRK-1T02 Package for Easy Handling During Evaluation
160 mm long FPC (flexible printed circuit)
connector
FPC_EDGE_0.5MM-6P
VDD3V3
J1
1
2
3
4
5
6
SCL
SDA
FPC pad
1
2/5
3
4
6
Symbol
SCL (CLK)
VSS
VDD3V3
SDA (DO)
A0
Definition
[Schmitt trigger] Serial interface CLK (up to 400 KHz)
Ground
Positive I/O supply voltage
Data output via I2C serial interface
Address (0 or 1) for use with two position sensors
A0
U1
1
2
3
4
C1
0.1uF
A0
C2
100pF
5
6
7
SDA
VDD3V3
SCL
VSS
C3
100pF
8
9
10
C4
100pF
VDD3V3
NC
TestBus3
MagINCn
MagDECn
DTest1_A
VDD5
VDD3V3
TestBus1
DTest2_B
Coil
Mode_Index
TestBus0
PWM
CSn
VSS
PDIO
NC
SCL / CLK
SDA / DIO
I2C_A0
20
19
18
17
16
15
14
13
12
11
SCL
SDA
A0
VSS
VSS
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NSE-5310
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
9.1 Recommended PCB Footprint
Figure 17. PCB Footprint
Recommended Footprint Data
Symbol
mm
inch
A
7.00
0.276
B
5.00
0.197
C
0.38
0.015
D
0.65
0.026
E
6.23
0.245
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Revision 1.5
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NSE-5310
Datasheet - R e v i s i o n H i s t o r y
Revision History
Revision
Date
1.0
03 Aug, 2007
Initial version
1.1
06 Jan, 2012
Updated Table 1 and Section 8.4.1 Sync Mode
Added logos to Package Drawings and Markings on page 17
1.2
19 Nov, 2012
Updated package diagrams and added Recommended PCB Footprint
1.3
09 Jan, 2013
06 Mar, 2013
1.4
1.5
Owner
rph
Description
Added Figure 14 and updated Absolute Maximum Ratings
Updated Ordering Information
20 Mar, 2013
Updates carried out in Absolute Maximum Ratings on page 4 and removed
SOIC info.
30 May, 2013
Updated Section 8.4 I²C User Interface
Note: Typos may not be explicitly mentioned under revision history.
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NSE-5310
Datasheet - O r d e r i n g I n f o r m a t i o n
10 Ordering Information
The devices are available as the standard products shown in Table 14.
Table 14. Ordering Information
Ordering Code
Description
TRK-1T02-E
Evaluation Pack
Includes TRK-1T02 position sensor, MC-31MB interface
card, New Scale pathway software
NSE-5310ASSU
NSE-5310ASST
Custom chip-on-board
Delivery Form
Encoder, TSSOP-20
Package
Tube
TSSOP-20
Tape & Reel
TSSOP-20
Inquire for details
Note: All products are RoHS compliant and ams green.
Buy our products or get free samples online at www.ams.com/ICdirect
Technical Support is available at www.ams.com/Technical-Support
For further information and requests, email us at [email protected]
(or) find your local distributor at www.ams.com/distributor
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NSE-5310
Datasheet - C o p y r i g h t s
Copyrights
Copyright © 1997-2013, ams AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights
reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the
copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. ams AG makes no
warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described
devices from patent infringement. ams AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior
to designing this product into a system, it is necessary to check with ams AG for current information. This product is intended for use in normal
commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability
applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing
by ams AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard
production flow, such as test flow or test location.
The information furnished here by ams AG is believed to be correct and accurate. However, ams AG shall not be liable to recipient or any third
party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or
indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the
technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of ams AG rendering of technical or other
services.
Contact Information
Headquarters
ams AG
Tobelbaderstrasse 30
A-8141 Unterpremstaetten, Austria
Tel
Fax
: +43 (0) 3136 500 0
: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
http://www.ams.com/contact
Contact Information
New Scale Technologies, Inc.
121 Victor Heights Parkway
Victor, NY 14564
Tel: +1 585 924 4450
Fax: +1 585 924 4468
[email protected]
www.newscaletech.com
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