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PDF AS5304 Data sheet ( Hoja de datos )
| Número de pieza | AS5304 | |
| Descripción | Integrated Hall ICs | |
| Fabricantes | ams | |
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Hay una vista previa y un enlace de descarga de AS5304 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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Datasheet: AS5304/AS5306 Integrated Hall ICs for Linear and Off-
Axis Rotary Motion Detection
Please be patient while we update our brand image as
austriamicrosystems and TAOS are now ams.
www.ams.com
1 page  
AS5304 / AS5306
Datasheet - Absolute Maximum Ratings
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 Magnetic Input on page 6 is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Symbol
VDD
Vin
Iscr
ΘJA
Tstrg
Tbody
MSL
Parameter
Supply
Input pin voltage
Input current (latchup immunity)
ESD
Package thermal resistance
Storage temperature
Soldering conditions
Humidity non-condensing
Moisture Sensitive Level
Min Max
-0.3 7
VSS-0.5 VDD+0.5
-100 100
+/-2
114.5
-55 150
260
5 85
3
Units
V
V
mA
kV
°C /W
°C
°C
%
Comments
Norm: JESD78
Norm: MIL 883 E method 3015
Still Air / Single Layer PCB
Norm: IPC/JEDEC J-STD-020
Represents a maximum floor life time of 168h
www.ams.com
Revision 1.9
4 - 19
5 Page 
AS5304 / AS5306
Datasheet - Detailed Description
7.2.4 Soft Stop Feature for Linear Movement Measurement
When using long multi-pole strips, it may often be necessary to start from a defined home (or zero) position and obtain absolute position
information by counting the steps from the defined home position. The AS5304/AS5306 provide a soft stop feature that eliminates the need for a
separate electro-mechanical home position switch or an optical light barrier switch to indicate the home position.
The magnetic field warning indicator (see Magnetic Field Warning Indicator on page 8) together with the index pulse can be used to indicate a
unique home position on a magnetic strip:
1. Firstly, the AS5304/AS5306 move to the end of the strip until a magnetic field warning is displayed (Index = high, A=B=low).
2. Then, the AS5304/AS5306 move back towards the strip until the first index position is reached (Note that an index position is generated
once for every pole pair, it is indicated with: Index = high, A=B= high). Depending on the polarity of the strip magnet, the first index
position may be generated when the end of the magnet strip only covers one half of the Hall array. This position is not recommended
as a defined home position, as the accuracy of the AS5304/AS5306 are reduced as long as the multi-pole strip does not fully cover the
Hall array.
3. It is therefore recommended to continue to the next (second) index position from the end of the strip (Index = high, A=B= high). This
position can now be used as a defined home position.
7.3 Incremental Hysteresis
If the magnet is sitting right at the transition point between two steps, the noise in the system may cause the incremental outputs to jitter back
and forth between these two steps, especially when the magnetic field is weak.
To avoid this unwanted jitter, a hysteresis has been implemented. The hysteresis lies between 1 and 2 LSB, depending on device scattering.
Figure 7 shows an example of 1LSB hysteresis: the horizontal axis is the lateral position of the magnet as it scans across the IC, the vertical axis
is the change of the incremental outputs, as they step forward (blue line) with movement in +X direction and backward (red line) in –X direction.
Note: 1LSB = 25µm for AS5304, 15µm for AS5306
Figure 7. Hysteresis of the Incremental Output
Incremental
output
X +4
Hysteresis:
1 LSB
X +3
X +2
X +1
Magnet position
X
X X+1 X+2 X+3 X+4
Movement direction: +X
Movement direction: - X
www.ams.com
Revision 1.9
10 - 19
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AS5304.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AS5304 | Integrated Hall ICs for Linear and Off-Axis Rotary Motion Detection |  austriamicrosystems AG |
| AS5304 | Integrated Hall ICs | ams |
| AS5305 | Integrated Hall IC | austriamicrosystems AG |
| AS5306 | Integrated Hall ICs for Linear and Off-Axis Rotary Motion Detection | austriamicrosystems AG |
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