AS5011 데이터 시트보기 (PDF) - austriamicrosystems AG

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AS5011

Low Power Integrated Hall IC for Human Interface Applications

austriamicrosystems AG 

AS5011

Data Sheet

6.4.1 Shutdown mode

LP_Pulsed = 1, LP_Active = 0, LP_Continue = 0, INT_wup_en = 1 [0x76] = 1001_x00x

This is the default operating mode when powering up the device, giving the lowest power consumption when the

whole system is in idle mode.

The analog part of the AS5011 is powered off (sleep mode). It is waked up every 80ms by an internal low power

logic, the hall sensors are read and the XY coordinate of the magnet is computed.

If the magnet position is above the threshold limits Xp, Xn, Yp, Yn, an interrupt will be generated on the INTn pin

and the device returns to sleep mode waiting for the next wake up after 80ms. As the host microcontroller receives

the interrupt, it can read the X and Y positions or configure the AS5011 to Low Power mode (see 6.4.2 below) in

order to track the magnet position until it returns to its initial position on the center.

INT_n remains LOW until X_int/Y_int have been read, or after a power mode change. The typical coordinates read

application after an interrupt is to read X first then Y_int.

6.4.2 Low Power mode

LP_Pulsed = 1, LP_Active = 1, LP_Continue = 0, INT_act_en = 1 [0x76] = 110x_100x

The Low Power mode is used to track the magnet coordinates when it has been moved from its initial center

position.

The AS5011 is in sleep mode and is waked up every 20ms. As soon as the XY position of the magnet is computed,

an interrupt is sent on the INTn pin to the microcontroller indicating that a valid coordinate is available, then the

sensor returns to sleep mode waiting for the next wake up after 20ms. INT_n remains LOW until X_int/Y_int have

been read, or after a power mode change. The typical coordinates read application after an interrupt is to read X

first then Y_int.

This mode generates a higher power consumption than the Shutdown mode because of the faster sampling rate

and the higher hall sensor current to provide an optimal accuracy of the coordinates.

When the microcontroller detects that the magnet has returned to the initial center position, it has to configure the

AS5011 back to Shutdown mode (see 6.4.1).

6.4.3 Full Power mode

LP_Pulsed = 0, LP_Active = 1, LP_Continue = 0 [0x76] = 010x_y00x

This mode allows the fastest coordinates reading. The sensor stays at its full capability, and never enters in sleep

mode.

The interrupt output goes LOW each time a new X and Y result has been computed and the valid data are ready to

be read by the host microcontroller. INT_n remains LOW until X_int/Y_int have been read, or after a power mode

change. The typical coordinates read application after an interrupt is to read X first then Y_int.

The INT_act_en bit (y):

• If INT_act_en = 1, after reading the X_int or Y_int register, the next sampled XY coordinate is stored and

won’t be updated until the next read of X_int or Y_int.

• If INT_act_en = 0, the last converted XY coordinate is read in real time.

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Revision 3.10

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