New miniature encoder with the smallest size and highest
resolution ... in a robust, cost-effective package
The TRACKER™ position sensor is a magnetic sensor array with
integrated on-chip digital encoding. With small size, 2 µm
resolution and low sensitivity to external magnetic fields, this
miniature magnetic encoder is a robust and cost-effective
alternative to miniature optical encoders.
On-chip encoding provides direct digital output using standard I2C
protocol, eliminating the need for external pulse counters. A
microprocessor can query multiple TRACKER position sensors and read
position information directly.
The highest-resolution magnetic encoder available, the TRACKER
position sensor is insensitive to light, shock, vibration, and
high-particulate environments. It can be used as a linear encoder or
off-axis rotary encoder.
Ideal for miniature optical, medical systems
The TRACKER position sensor is ideal for optical and imaging
systems, consumer electronics, precision biomedical devices,
instrumentation, automation, and automotive applications. Its small
size makes it perfect for creating tiny, integrated closed-loop
motion systems using micro motors such as New Scale’s
SQUIGGLE motor.
TRACKER mini position sensor benefits
- Alternative to miniature optical encoders
smaller size, higher resolution, lower cost
- Accurate, non-contact sensing
2 µm resolution, 2 µm repeatability
- Complete system on a chip
sensing and encoding integrated in one ingeniously small
package
- Direct digital output (I2C)
eliminates need for external pulse counters
- Robust
insensitive to light, shock, vibration and particulates;
less stringent mounting alignment
- Absolute performance
zero reference: automatic gain & offset correction
TRACKER sensor operation
The TRK-1T02 comprises New Scale’s NSE-5310 magnetic encoder in a
TSSOP on a printed circuit board. A linear array of eight Hall
effect sensors on the chip measures the spatially varying magnetic
field produced by moving a multi-pole magnetic strip above the
sensor.
The magnetic field generates internal sinusoidal and
phase-shifted sinusoidal signals. These signals are filtered and
transformed into angular and magnitude values, representing the
absolute linear position of a 2 mm long magnetic encoder strip pole
pair.
The position information is read via an I2C interface.
Automatic gain control (AGC) adjusts for DC bias in the magnetic
field and provides a large dynamic input range of the magnetic field
for higher immunity to external magnetic fields. It also provides an
absolute magnitude of the magnetic field intensity, which can be
used to detect the end of the magnetic strip and thereby serve as a
built-in zero reference.
The TRACKER is factory-configured to use 10 bits of position
resolution out of a total of 12 bits to achieve maximum speed (20
mm/sec) with minimum noise.
Download TRACKER
Overview (464Kb PDF)
Download TRK-1T02
data sheet with drawings and I2C details (459Kb PDF)
|
TRACKER Specifications
|
| Supply
Voltage |
3 - 3.6 V |
| Supply
Current |
21 mA max |
| Resolution |
2 µm @ 10 bits per 2 mm pole pair
|
| Integral
non-linearity |
± 40 μm max (note 1)
|
| Differential
non-linearity |
±0.97 μm max (10 bit, no missing codes) |
| Hysteresis |
2-8 LSB with incremental output/ 12 bit res.
0 for absolute serial output |
| I2C read-out
frequency |
400 kHz (typ) to 800 kHz (max) |
| |
|
| Operating Temperature
|
-30 to +80° C
|
| Storage Temperature
|
-40 to +85° C
|
| Humidity
non-condensing |
5 to 85% |
| Dimensions |
8.5 x 11.5 x 1.61 mm
(Total height ~3 mm with magnet and air gap)
|
| Thermal pkg resistance
|
114.5°C/W (still air) absolute max |
Note 1: Best line fit = (Errmax – Errmin) / 2
including magnet error, T = -30 to +70 °C
Note: System integral non-linearity is limited by magnetic source
Ordering Information
The TRK-1T02-E TRACKER evaluation pack includes a suitable linear
magnetic strip, along with the MC-31MB interface card with software
to facilitate evaluation: the USB interface returns direct position
information.
For qualified OEMs, we can develop custom TRACKER chip-on-board
position sensors to your requirements, or we can provide the encoder
chip in TSSOP or dice-on-foil packaging.
|
Model
|
Description |
| TRK-1T02
Position Sensor |
Integrated sensor and encoder in TSSOP on 8.5 x 11.6 mm printed circuit
board with cables |
| TRK-1T02-E
Evaluation Pack |
TRK-1T02 position sensor, MC-31MB interface card, power supply and cables,
USB cable and software |
| TRK-1C02-XX |
Custom chip-on-board; contact factory |
| NSE-5310 SOIC |
Integrated sensor and encoder in TSSOP or foil-on-die; contact factory |
Put the TRACKER mini encoder to work
Call us at (585) 924-4450 x 112 or
email us today. |
With the smallest size and
highest resolution, the TRACKER position sensor is a robust,
cost-effective alternative to miniature optical encoders.
The TRACKER position sensor
offers high resolution non-contact sensing. A Hall effect sensor
array is integrated with on on-chip encoder, providing direct
digital output via I2C interface. Automatic gain control
and offset correction provide high resolution.
The TRK-1T02-E TRACKER
evaluation pack includes a RTK-1T02 TRACKER position sensor and
linear magnetic strip, along with the MC-31MB interface card
with software to facilitate evaluation: the USB interface
returns direct position information.
|
