AS5011

Data Sheet

www.austriamicrosystems.com

6.4.4

Switching the power modes

The following sequence example would be used for a typical mobile application (mobile phone, PDA, MP3 player):

Figure 9: Typical application sequence for mobile device

After a complete system power up, a soft reset should be applied by sending the I²C commands

[0x76] = 0x9A

then [0x76] = 0x98.

If needed the host microcontroller writes the configuration once to the AS5011, for example the

inv_spinning

register if the magnet is inverted (see 7.2) or the Xp Xn Yp Yn wakeup threshold values. The

cursor is normally centered X,Y = (0,0) as the magnet position 1 on Figure 5 . The AS5011 is in Shutdown

mode

by default.

The cursor is moved by the user above the Yp threshold. An interrupt is generated and remains LOW

until an X_int/Y_int read or a power mode changing.

The microcontroller configures the AS5011 in Low Power mode ( [0x76] = 110x_100x ) for faster

reading. The interrupt is released to HIGH automatically by the power mode change.

Interrupts are generated automatically every 20ms when the XY coordinates are ready for reading.

The microcontroller reads the X register [0x41] then Y_int register [0x52] which releases INTn to HIGH.

During this phase, the cursor is still moving and stays out of the wakeup thresholds range.

If the microcontroller doesn’t read X_int or Y_int immediately after an interrupt, the INTn pin remains

LOW until the next read of X_int or Y_int. The last new converted (a new sample every 20ms) coordinate

will be transferred.

The cursor has been released by the user, and returns to the center of the AS5011 (magnet position

1 on Figure 5). The microcontroller will read X,Y = (0,0), and will configure the sensor to Shutdown mode

([0x76] = 1001_x00x)

.

Note:

Firmware application notes with source code example for AS5011 and EasyPoint modules are available on

www.austriamicrosystems.com website.

Revision 3.10

7 – 16