www.ams.com/AS5030

Revision 2.4

32 - 44

AS5030

Datasheet - Application In formatio n

1. Wait for CPU interrupt or delay for next angle read (typ. <3ms in LP mode, typ>3ms in ULP mode)

2. Wake up (PSM = 0)

3. Wait 0.01ms (Low Power Mode)

4. Check if Lock = 1 then read angle

5. Enable Low Power Mode or Ultra-low Power Mode (PSM=1)

6. Return to 1

The difference between Low Power Mode and Ultra-low Power Mode is the current consumption and the wake-up time to switch back to active

operation.

In both Reduced Power Modes, the AS5030 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. If the AS5030 is cycled

between active and reduced current mode, a substantial reduction of the average supply current can be achieved. The minimum dwelling time in

active mode is the wake-up time. The actual active time depends on how much the magnet has moved while the AS5030 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 AS5030 can be put back to

reduced power mode. The average power consumption can be calculated as:

(EQ 6)

Where:

Example: Ultra-low Power Mode; sampling period = one measurement every 10ms.

(EQ 7)

See Figure 27 for an overview table of the average current consumption in the various reduced power modes.

Reducing Power Supply Peak Currents.

An optional RC-filter (R1/C1) may be added to avoid peak currents in the power supply line when the AS5030 is toggled between active and

reduced power mode. R1 must be chosen such that it can maintain a VDD voltage of 4.5V ~ 5.5V under all conditions, especially during long

active periods when the charge on C1 has expired. C1 should be chosen such that it can support peak currents during the active operation

period. For long active periods, C1 should be large and R1 should be small.

Mode

Current Consumption

(typ.)

Wake-up Time to Active

Operation

Active operation

14 mA

1.0 ms (without AGC)

3.8 ms (with locked AGC)

Low Power Mode

1.4 mA

0.15 ms

Ultra-low Power Mode

30 µA

0.5 ms

off

on

off

down

power

on

active

avg

t

t

t

I

t

I

I

+

∗

+

∗

=

_

A

ms

s

ms

A

s

mA

I

avg

μ

μ

μ

μ

729

5

,

9

500

5

,

9

*

30

500

14

=

+

+

∗

=