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AS5130
Datasheet - Detailed Description
7.8 Reduced Power Modes
The AS5130 can be operated in three reduced power modes. All three modes have in common that they switch off or freeze parts of the chip
during intervals between measurements. In Low Power Mode or Ultra Low Power Mode, the AS5130 is not operational, but due to the fast start-
up, an angle measurement can be accomplished very quickly and the chip can be switched to reduced power immediately after a valid
measurement has been taken. Depending on the intervals between measurements, very low average power consumption can be achieved using
such a strobed measurement mode.
Low Power Mode: reduced current consumption, very fast start-up. Ideal for short sampling intervals (<3ms).
Power Cycling Mode: zero power consumption (externally switched off) during sampling intervals, but slower start-up than Polling Mode.
Ideal for sampling intervals 200ms.
Polling Mode: for reduction of the average power consumption; especially suited for battery powered applications.
7.8.1 Low Power Mode
The AS5130 can be put in Low Power Mode by simple serial commands, using the regular SSI commands. The required serial command is
WRITE CONFIG (17H, Figure 4 on page 9). The angle data is valid, as soon as the LOCK- Flag is 1 (see Table 9).
In Reduced Power Modes, the AS5130 is inactive. The last state, 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.
Figure 16. Low Power Mode and Ultra Low Power Mode Connection
1000
0.175?/DIV>
10000
1.75?/DIV>
Table 12. Examples of the Overall Position Error caused by Speed (includes both propagation delay and filter delay)
Speed (rpm)
Total Position Error (?/SPAN>?/SPAN>
pd +
?SPAN class="pst AS5130-ASST-500_2599059_8">?/SPAN>
lpf
)
VDD
VSS
micro
controller
AS5130
100n
VSS
+5V
VDD
CS
VDD
DCLK
DIO
VSS
AS5130
C1
S
N
I
on
I
off
t
on
t
off
on/off
R1
C1
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