AS5245 AMSCO [austriamicrosystems AG], AS5245 Datasheet - Page 23

• Manufacturer Part Number: AS5245
• Manufacturer: AMSCO [austriamicrosystems AG]

AS5245
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
9.3 3.3V / 5V Operation
The AS5245 operates either at 3.3V ±10% or at 5V ±10%. This is made possible by an internal 3.3V Low-Dropout (LDO) Voltage regulator. The
internal supply voltage is always taken from the output of the LDO, meaning that the internal blocks are always operating at 3.3V.
For 3.3V operation, the LDO must be bypassed by connecting VDD3V3 with VDD5V
For 5V operation, the 5V supply is connected to pin VDD5V, while VDD3V3 (LDO output) must be buffered by a 1...10µF capacitor, which is
supposed to be placed close to the supply pin
Note: The VDD3V3 output is intended for internal use only. It must not be loaded with an external load.
The output voltage of the digital interface I/O’s corresponds to the voltage at pin VDD5V, as the I/O buffers are supplied from this pin.
Figure 15. 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.
www.austriamicrosystems.com/AS5245
+
4.5 - 5.5V
5V Operation
100n
VDD5V
VSS
LDO
VDD3V3
1... 10µF
Internal
N
T
E
R
F
A
C
E
I
VDD
(see Figure
PWM
CLK
PDIO
DO
CSn
15).
Revision 1.3
+
3.3V Operation
3.0 - 3.6V
VDD5V
(see Figure
VSS
15).
LDO
VDD3V3
Internal
N
E
R
A
C
E
T
F
I
VDD
PWM
CLK
PDIO
DO
CSn
100n
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