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PDF MA750 Data sheet ( Hoja de datos )
| Número de pieza | MA750 | |
| Descripción | Contactless Turning Knob Sensor | |
| Fabricantes | MPS | |
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Hay una vista previa y un enlace de descarga de MA750 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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MagAlpha
MA750
Contactless Turning Knob Sensor
Key features
8 bit digital and 12 bit PWM output
500 kHz refresh rate
7.5 mA supply current
Serial interface for data readout and settings
General Description
The MagAlpha MA750 is a robust contactless angle
encoder suitable for control buttons and knobs. The
IC detects the absolute angular position of a
permanent magnet, typically a diametrically
magnetized cylinder attached to the rotor.
QFN16 3x3mm Package
The output is digital (SPI) or PWM. For usual
potentiometer replacement, the PWM signal can be
filtered to obtain an analog signal.
Figure 1: Functional Block Diagram
Monolithic Power Systems, Inc. | Gland, Switzerland | Tel: +41 22 364 63 50 | [email protected] | www.sensimatech.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2014 Monolithic Power Systems. All Rights
Reserved. MA700 Rev 1.0 September 2014
1
1 page  
MA750
Contactless Turning Knob Sensor
5. Sensor – Magnet Mounting
The sensitive volume of the MA750 is confined in a
region less than 100 µm wide and consists of multiple
integrated Hall devices. This volume is located, with a
precision of 50 m in the center of the QFN package,
both horizontally and vertically. The sensor detects the
angle of the magnetic field projected in a plane parallel
to the package upper surface. It means that the only
magnetic field that matters is the in-plane component
(X and Y components) in the package middle point.
This detection mode gives flexibility for the design of
an angular encoder: all the sensor needs is that the
magnetic vector lies essentially within the sensor plane
and that its amplitude is comprised between 30 and 150
mT. Note that the MA750 does work with smaller than
30 mT fields, but the linearity and resolution
performance may deviate from the specifications (see
Table 2).
Figure 4: End-of-Shaft Mounting
6. Power Supply Decoupling
For most applications, a single 100 nF bypass capacitor
placed close to the supply pins sufficiently decouples
the MA750 from noise of the power supply. If better
decoupling is required, a larger capacitor (10 µF) can
be added in parallel with the 100 nF, and/or a resistor
(10) can be added between the supply line and the
capacitor node.
In any case, make sure that the connection between the
MA750 ground and the power supply ground has a low
impedance, in order to avoid noise transmitted from the
ground.
VFLASH needs to be supplied only when flashing the
memory. Otherwise the VFLASH pin can remain
unconnected or grounded (see Figure 5).
Figure 5: Connection for Supply Decoupling
Monolithic Power Systems, Inc. | Gland, Switzerland | Tel: +41 22 364 63 50 | [email protected] | www.sensimatech.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2014 Monolithic Power Systems. All Rights
Reserved. MA700 Rev 1.0 September 2014
5
5 Page 
MA750
Contactless Turning Knob Sensor
12. Package Dimensions
Package: Plastic Quad Flatpack No-lead QFN-16 3x3mm
NOTES:
1. All dimensions are in mm
2. Package dimensions does not include mold flash, protrusions, burrs or metal smearing
3. Coplanarity shall be 0.08
4. Compliant with JEDEC MO-220
Monolithic Power Systems, Inc. | Gland, Switzerland | Tel: +41 22 364 63 50 | [email protected] | www.sensimatech.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2014 Monolithic Power Systems. All Rights
Reserved. MA700 Rev 1.0 September 2014
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MA750.PDF ] | |
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