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AS5134
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
8.4.2
Digital Readout Rate
Apart from the chip-internal propagation delay, the chip requires time to read and process the angle data. Due to its nature, a PWM signal is not
usable at high speeds, as you get only one reading per PWM period. Increasing the PWM frequency improves it. But problems will occur at the
receiving controller to resolve the PWM steps. The frequency on the AS5134 PWM output is typical 1.33kHz with a resolution of 2μs/step. A
more suitable approach for high speed absolute angle measurement is using the serial interface. With a clock rate of up to 6MHz, a complete set
of data (21bits) can be read in >3.5μs.
8.4.3
Low Power Mode
The target of this mode is to reduce the long time power consumption of the device for battery powered applications, without losing the actual
angle information.
In Low Power Mode, the AS5134 is inactive. The last state (for e.g. the angle, AGC value, etc.) is frozen and the chip starts from this frozen state
when it resumes active operation. This method provides much faster start-up than a “cold start” from zero. If the AS5134 is cycled between
active and reduced current mode, a substantial reduction of the average supply current can be achieved. The minimum dwelling time is <0.5 ms.
The actual active time depends on how much the magnet has moved while the AS5134 was in reduced power mode. The angle data is valid,
when the status bit LOCK has been set. Once a valid angle has been measured, the AS5134 can be put back to reduced power mode. The
average power consumption can be calculated as:
I active ? t on + I powerdown ? t off
I avg = ---------------------------------------------------------------------
t on + t off
sampling interval = t on + t off
(EQ 2)
Where:
I avg = Average current consumption
I active = Current consumption in active mode
I power_down = I off : Current consumption in reduced power mode (max. 120μA)
t on = Time period during which the chip is operated in active mode
t off = Time period during which the chip is in reduced power mode
To access the Low Power Mode, the bit ‘LP’ <15> of the digital interface has to be set to “1”.
Figure 20. Low Power Mode Connection
R1
+5V
VDD
I on
I off
t on
t off
VDD
VDD
on/off
C1
100nF
S
N
CS
DCLK
Micro
Controller
AS5134
DIO
VSS
C 2
VSS
VSS
Reducing Power Supply Peak Currents. When the AS5134 is toggled between active and reduced power mode, there is the option to
add an RC-filter (R1/C1) to avoid peak currents at power supply. The value of R1 is set that it maintains a VDD voltage of 4.5V – 5.5V and
especially during long active periods the R1 must maintain the charge which C1 has expired. C1 can be set in such a way as it can support peak
currents during the active operation period. In case of long active periods, C1 has a great value and R1 has a small value.
www.austriamicrosystems.com/AS5134
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