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AS5311
Datasheet - D e t a i l e d D e s c r i p t i o n
Figure 8. PWM Output Signal
Position
0μm
(Pos 0)
PW MIN
1μs
4098 μs
PW MAX
1999.5μm
(Pos 4095)
409 7 μs
1/f PWM
7.7 3.3V / 5V Operation
The AS5311 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 (see Figure 9) .
For 5V operation, the 5V supply is connected to pin VDD5V, while VDD3V3 (LDO output) must be buffered by a 2.2...10μF capacitor, which is
supposed to be placed close to the supply pin.
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.
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.ams.com/AS5311
Revision 1.12
16 - 29
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