AS5013 datasheet(33/50 Pages) AMSCO

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[v2-00] 2021-Apr-19

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AS5013 − I²C Registers

Hall Element Direct Read Registers (16h to 29h)

Each Hall element C1..C5 can be read independently, after each

interrupt (data ready).

One hall element value consists of two 12-bit signed-registers:

Cx_neg and Cx_pos. For each conversion cycle (i.e. after a

readout or Y_res in idle mode, or at each time-based conversion

cycle in Low Power mode), each Hall element is read twice: With

normal spin (result Cx_pos) and then with inverted spin (result

Cx_neg) in order to remove any Hall voltage offset from the Hall

elements.

The formula to read any Hall element Cx:

Cx = (Cx_pos – Cx_neg) / 2

Where

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

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

Figure 37:

Hall Element Direct Read Registers (2Ah)

The AGC register controls the sensitivity of each Hall element

C1...C5, in order to stay in the larger dynamic range of the 12-bit

ADC of the AS5013. In order to determine the best value to be

set during the AS5013 initialization, place your magnet on the

0,0 position (centered on C5 Hall element), and increase the

AGC value to obtain the nearest value to 2867 (= 70% of 4096).

It is possible that this value cannot be reached with small

magnets or with large airgaps. In that case set AGC to 3Fh, which

is the maximum sensitivity.

Power ON

The AS5013 has a Power ON Reset (POR) cell to monitor the VDD

voltage at startup and reset all the internal registers.

After the internal reset is completed, the POR cell is disabled in

order to save current during normal operation.

If VDD drops below 2.7V down to 0.2V, the POR cell will not be

enabled back, and the registers will not be correctly reseted or

can get random values.

Note: It is highly recommended to control the external RESETn

signal by applying a LOW pulse of >100ns once VDD reached

2.7V and VDDp reached 1.7V.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

AGC5

AGC4

AGC3

AGC2

AGC1

AGC0

R/W

Reset value: 0010 0000

(EQ1)

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