AS5050-EQFT Просмотр технического описания (PDF) - austriamicrosystems AG
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AS5050-EQFT Datasheet PDF : 22 Pages
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AS5050
Datasheet - Detailed Description
7 Detailed Description
User Programming.
The AS5050 does not require any programming by the user. A dedicated on-chip zero position programming is not implemented. If a zero
position programming is required, it is recommended to store the zero position offset in the host controller.
7.1 Operating Modes
Typical Application.
The AS5050 requires only a few external components in order to operate immediately when connected to the host microcontroller. Only 6 wires
are needed for a simple application using a single power supply: two wires for power and four wires for the SPI communication. A seventh
connection can be added in order to send an interrupt to the host CPU to inform that a new valid angle can be read.
Figure 3. Typical Application Using SPI 4-Wire Mode and INT/ Output
Hall Sensors
Power Management
VSS
Test_coil
4µ7
15 ohm
DC 3. 0 ~3.6V
AS5050
VDD
VDD
ADC
Cordic
SPI Interface
VDDp
Wire MOSI MISO SCK
mode
Supply: peripherals
INT/
Interrupt
EN_INT/
VDDp
DC1.8 ~3.6V
VDDp
100 n
SS/
SPI
Interface
µC
Upon power-up, the AS5050 performs a full power-up sequence including one angle measurement. The completion of this cycle is indicated at
the INT/ output pin and the angle value is stored in an internal register. Once this output is set, the AS5050 suspends to sleep mode.
7.1.1 Power Supply Filter
Due to the sequential internal sampling of the Hall sensors, fluctuations on the analog power supply (pin#12: VDD) may cause additional jitter of
the measured angle. This jitter can be avoided by providing a stable VDD supply.
The easiest way to achieve that is to add a RC filter: 15Ω + 4.7µF in the power supply line as shown in Figure 3.
Alternatively, a filter: 33Ω + 2.2µF may be used. However with this configuration, the minimum supply voltage is 3.15V.
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