AS5045-ASST datasheet(28/47 Pages) AMSCO

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AS5045 − Detailed Description

3.3V / 5V Operation

The AS5045 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 29).

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 (see Figure 29).

The VDD3V3 output is intended for internal use only It must not

be loaded with an external load (see Figure 29).

Figure 29:

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.

Internal

VDD

LDO

VSS

VDD5V

VDD3V3

100n

4.5 - 5.5V

2.2... 10µF

PWM

CLK

CSn

PROG

Internal

VDD

LDO

VSS

VDD5V

VDD3V3

3.0 - 3.6V

PWM

CLK

CSn

PROG

100n

5V Operation

3.3V Operation

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