AS5040(2006) View Datasheet(PDF) - austriamicrosystems AG
Part Name
Description
View to exact match
AS5040 Datasheet PDF : 28 Pages
| |||
AS5040 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
5V Operation
100n
VDD5V
VDD3V3
LDO
1...10µF
Internal
VDD
I
4.5 - 5.5V
N
T
E
R
F
A
C
E
VSS
DO
PW M_LSB
CLK
CSn
A_LSB_U
B_Dir_V
Index_W
Prog
3.3V Operation
VDD3V3
VDD5V
LDO
3.0 - 3.6V
VSS
Internal
VDD
I
N
T
E
R
F
A
C
E
100n
DO
PW M_LSB
CLK
CSn
A_LSB_U
B_Dir_V
Index_W
Prog
Figure 18: 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..
12 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 Bv at a given distance, along a concentric
circle with a radius of 1.1mm (R1), should be in the range
of ±45mT…±75mT. (see Figure 19).
typ. 6mm diameter
N
R1
Vertical field
component
S
Magnet axis
Magnet axis
Vertical field
component
Bv
R1 concentric circle;
radius 1.1mm
(45…75mT)
0
360
360
Figure 19: Typical magnet and magnetic field distribution
Revision 1.6, 03-Oct-06
www.austriamicrosystems.com
Page 14 of 28
|
|
Share Link: 