as5055 austriamicrosystems, as5055 Datasheet - Page 7

• Manufacturer Part Number: as5055
• Description: Low Power 12 Bit Magnetic Rotary Encoder
• Manufacturer: austriamicrosystems

AS5055
Data Sheet – Operation Modes
The angle jitter can be reduced by averaging of several angle samples in the external microcontroller. For example, an
averaging of 4 samples reduces the jitter by 6dB (50%).
9.4 Low Power Mode
After completing the readout of an angle value, the device is in very low power condition. The AS5055 remains in
sleep mode until it receives another angle reading request over the SPI interface. The average power consumption
therefore depends on the interval, at which the external controller reads an angle over the SPI Interface. The timing
ratio between active and sleep phase:
For:
Examples:
3000 measurements per second (continuous mode)
1000 measurements per second
100 measurements per second
10 measurements per second
Note that even in low power mode, the power supply must be capable of supporting the active current at least for the
time Ton, until the AS5055 is suspended to sleep mode.
www.austriamicrosystems.com
ton =
toff =
Ion =
Ioff =
Minimum on-time for power-up and angle measurement
Pause interval between measurements, determined by the polling
rate of the external microcontroller
Current consumption in active mode
Current consumption in sleep mode
I
avg
t
on
Revision 1.2
I
t
on
on
I = 8mA
Iavg = 5mA
Iavg = 500µA
Iavg = 53µA
t
t
off
off
I
off
600µs
8mA avg.
3µA
7 – 22