www.austriamicrosystems.com

Revision 1.00

24 - 41

AS5130

Data Sheet - D e ta i l e d D e s c r i p t i o n

If the AS5130 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 AS5130 was in reduced power mode. The angle data is valid,

when the status bit LOCK has been set (see Table 9). Once a valid angle has been measured, the AS5130 can be put

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

(EQ 7)

Where:

Reducing Power Supply Peak Currents

An optional RC-filter (Rx/Cx) may be added to avoid peak currents in the power supply line when the AS5130 is

5.5V under all conditions, especially during long active periods when the charge on Cx has expired. Cx should be

chosen such that it can support peak currents during the active operation period. For long active periods, Cx should be

large and Rx should be small.

Power Cycling Mode

The power cycling method shown in Figure 17 cycles the AS5130 by switching it on and off, using an external PNP

transistor high side switch. The current consumption in off-mode is zero. It also has the longest start-up time of all

modes, as the chip must always perform a “cold start “ from zero, which takes about 1.9 ms (Compare with Low Power

Mode on page 23).

Figure 17. Power Cycling Mode

The optional filter Rx/Cx may again be added to reduce peak currents in the 5V power supply line (see Reducing

Power Supply Peak Currents on page 24).

Polling Mode

Target of this mode is a reduction of the average power consumption. In this mode, the IC supply is pulsed, thereby

reducing the average power consumption to a fraction. The actual angle information and multi turn count value is not

lost; polling mode is especially suited for battery powered applications. The IC is furthermore capable of generating a

WAKE signal as soon as the magnet’s position has changed, but only if the supply of the IC is powered-on again. By

means of the WAKE signal, the system’s power consumption can be further decreased, if certain modules are

activated on demand.

+

+

---------------------------------------------------------------------

micro

controller

AS5130

100n

+5V

CS

DCLK

DIO

AS5130

C1

S

N

0

on/off

Rx

10k

Cx

>µF