AS5040_1 AMSCO [austriamicrosystems AG], AS5040_1 Datasheet - Page 22

• Manufacturer Part Number: AS5040_1
• Description: 10Bit 360 Programmable Magnetic Rotary Encoder
• Manufacturer: AMSCO [austriamicrosystems AG]

AS5040
Data Sheet
Figure 19: Connections for 5V / 3.3V Supply Voltages
A buffer capacitor of 100nF is recommended in both cases close to pin VDD5V. Note that pin VDD3V3 must always
be buffered by a capacitor. 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.
15 Choosing the 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 magnet’s field strength perpendicular to the die surface should be verified using a gauss-meter. The magnetic
field B
±45mT…±75mT. (see Figure 20).
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v
at a given distance, along a concentric circle with a radius of 1.1mm (R1), should be in the range of
4.5 - 5.5V
5V Operation
100n
VDD5V
VSS
LDO
VDD3V3
2.2...10µF
Internal
VDD
N
T
E
R
F
A
C
E
I
DO
PWM_LSB
CLK
CSn
A_LSB_U
B_Dir_V
Index_W
Prog
Revision 2.10
3.0 - 3.6V
3.3V Operation
VDD5V
VSS
LDO
VDD3V3
Internal
VDD
N
E
R
A
C
E
T
F
I
DO
PWM_LSB
CLK
CSn
A_LSB_U
B_Dir_V
Index_W
Prog
100n
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