as5145h austriamicrosystems, as5145h Datasheet - Page 24

• Manufacturer Part Number: as5145h
• Description: 12-bit Programmable Magnetic Rotary Encoder
• Manufacturer: austriamicrosystems

AS5145
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
Figure 17. Connections for 5V / 3.3V Supply Voltages
A buffer capacitor of 100nF is recommended in both cases close to pin V
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
angle.
9.4 Selecting Proper Magnet
Typically the magnet should be 6mm in diameter and 2.5mm in height. Magnetic materials such as rare earth AlNiCo/SmCo5 or NdFeB are
recommended. The magnetic field strength perpendicular to the die surface has to be in the range of ±45mT…±75mT (peak).
The magnet’s field strength should be verified using a gauss-meter. The magnetic field Bv at a given distance, along a concentric circle with a
radius of 1.1mm (R1), should be in the range of
www.austriamicrosystems.com/AS5145
+
4.5 - 5.5V
5V Operation
100nF
VDD5V
VSS
LDO
VDD3V3
2.2µF
Internal
N
E
R
A
C
E
T
F
I
VDD
±45mT…±75mT(see Figure
PWM
CLK
PDIO
DO
CSn
Revision 1.11
DD
5V. Note that pin V
+
18).
3.3V Operation
3.0 - 3.6V
VDD5V
VSS
DD
3V3 must always be buffered by a capacitor.
LDO
VDD3V3
N
E
R
A
C
E
Internal
T
F
I
VDD
PWM
PDIO
DO
CLK
CSn
100nF
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