IS1101 Single Channel Inductive Position Sensor with Digital Output0 pages

IS1101
Inductive Position Sensor
With Digital Output

Product data
Features
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Differential inductive sensing principle
Insensitive to magnetic interference fields
Robust against oil, water, dust, particles
Ultra-thin package, 0.9 mm thick
Pads for surface-mount soldering of cable
Thin PCB-type target strips/discs

Applications
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Industrial / laboratory / office automation
Linear stages and X-Y tables
Assembly / Pick & Place equipment
Linear motor, voice coil actuator
Pneumatic/hydraulic actuator
Machine tools

A/B

Description
The IS1101 is a single-channel differential inductive
position sensor suitable for counting on periodic targets like
gears, cogwheels, racks, slotted discs, PCB-targets and for
edge detection of metallic objects with larger dimensions.
The target material can be either ferromagnetic (steel) or
electrically conducting (aluminum, brass, copper).

For “edge detection” applications (Figure 1b), the target is
a metallic object with typical dimensions > 5 mm. One of
the “edges” of the target generates an output pulse, which
edge depends on the orientation of the sensor and on the
target material (Figure 2).
Ferromagnetic object

Electr. conducting object

General Specifications
Counting frequency...........0 – 40 kHz
Airgap ...............................up to 1.5 mm
Supply ...............................5.0 ± 0.5 V, 15 mA typ
Temperature .....................0 – 100°
C
Output format ....................digital

a)

b)

Fig. 2 Edge detection a) for a ferromagnetic material and
b) for an electrically conducting material.

Tooth counting vs edge detection
The IS1101 sensor can be used for tooth counting and for
edge detection applications.
For “tooth counting” applications (Figure 1a), the target
period is typically 1.5 - 3 mm. For each tooth, one digital
output pulse is generated. The rising and falling transition
of the digital output signal correspond to the center of the
tooth and to the center of the gap between two teeth.

Targets
Examples for “tooth counting” according to Figure 1a:
- Steel gear with module 0.5 – 1.
- Aluminum/brass gear with module 0.7 – 1.
- Linear or rotational PCB-target with copper pattern with
period length 1.5 – 3.0 mm.
Examples for “edge detection” according to Figure 1b:

Repetitive target

Single large tooth

a)

b)

Fig. 1 Digital output signal a) for tooth counting and b) for
edge detection.

IS1101-PB-V1C

- Index wheel made of steel, aluminium or brass with one
tooth or groove.
- Cam-wheel with tooth length longer than 5 mm.
- Slotted metal disk with period length longer than 5 mm.
- Linear or rotational PCB-target with one copper stripe or
one opening in a copper surface.
- Metallic object moving laterally in front of the sensor
(piston, rod, valve ...).

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