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AS5130

Datasheet - Detailed Descr i pti on

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

0.175º

10000

1.75º

Table 12. Examples of the Overall Position Error caused by Speed (includes both propagation delay and filter delay)

Speed (rpm)

Total Position Error (

micro

controller

AS5130

100n

+5V

CS

DCLK

DIO

AS5130

C1

S

N

on/off

R1

C1