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AS5013

Datasheet - I²C Registers

8.15 Registers Initialization

After Power Up, the following sequence must be performed:

1. VDD and VDDp Power up, and reached their nominal values (VDD>2.7V, VDDp>1.7V).

2. RESETn LOW during >100ns

3. Delay 1000µs

4. Loop check register [0Fh] until the value F0h or F1h is present (reset finished, registers to their default values)

5. Optional: Write value 86h into register [2Eh]

→ Invert magnet polarity. See Control Register 2 (2Eh) on page 22.

6. Configure register [2Bh]

→ Configure M_ctrl middle hall element control

7. Configure register [2Ch]

→ Configure J_ctrl attenuation factor

8. Configure register [2Dh]

→ Configure T_ctrl scaling factor

9. Configure the wanted Power Mode into register [0Fh] (Idle mode or Low Power Mode with Timebase configuration)

10. X Y coordinates are ready to be read.

Note:

In order to detect if the magnet polarity is correct, read the C5 middle hall element when the magnet is centered.

C5 = (C5_pos – C5_neg) / 2

With:

C5_pos = (c5_pos[11:8] << 8) | c5_pos[7:0]

C5_neg = (c5_neg[11:8] << 8) | c5_neg[7:0]

C5 must always be positive.

If C5 is negative, then invert the bit inv_spinning in the Control Register 2 (2Eh). C5 will become positive.

8.16 Registers Table

The following registers / functions are accessible over the serial I²C interface.

Table 6. Registers

Register

Number

of bits Access Address

Format

Reset

Value

Bit

Description

IC Identification

ID Code

8

R

0C

0Ch

<7:0> 8-bit Manufacture ID Code

ID Version

8

R

0D

0Dh

<7:0> 8-bit Component ID Version

Silicon Revision

8

R

0E

00h

<7:0> 8-bit Silicon Revision

Control_register_1

Idle

1

R/W

0Fh

1b

<7>

1: Idle mode

0: Low Power mode

Low_power_timebase

3

R/W

0Fh

111b

<6:4> Low Power readout time base register

INT_disable

1

R/W

0Fh

0b

<3>

Disables the interrupt functionality.

1: Interrupt disabled

0: Interrupt enabled

INT_function

1

R/W

0Fh

0b

<2>

Interrupt control register

0: interrupt goes low with every new calculated x/y

coordinates

1: interrupt pin goes low in when new x/y coordinates

are calculated and the magnet has exited the xp, xn,

yp, yn threshold values

soft_rst

1

R/W

0Fh

0b

<1>

Soft Reset

0: Normal mode

1: all registers return to their respective reset value

data_valid

1

R

0Fh

0b

<0>

Data valid indicator

0: X/Y calculation ongoing

1: X/Y calculation finished, coordinates ready