AS5132 datasheet(29/40 Pages) AMSCO

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[v2-06] 2016-Jan-26

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AS5132 − Detailed Description

Hysteresis of the Incremental Outputs

A hysteresis is implemented to get a stable output value at the

SSI command and to reduce jitter at the PWM and UVW outputs.

At start up the hysteresis counter is at 0, the range is ±1 LSB.

The hysteresis can be deactivated by setting OTP bit Hyst_dis.

Figure 38:

Hysteresis of the Outputs

Multi Turn Counter

A 9-bit register is used for counting the magnet’s revolutions.

With each zero transition in any direction, the output of a

special counter is incremented or decremented. The initial

value after reset is 0 LSB. Clockwise rotation gives increasing

angle values and positive turn count. Counter clockwise

rotation exhibits decreasing angle values and a negative turn

count respectively.

The counter output can be reset by using command 20 – SET

MT Counter. It is immediately reset by the rising clock edge of

this bit. Any zero crossing between the clock edge and the next

counter readout changes the counter value.

High Speed Operation

The AS5132 is using a fast tracking ADC (TADC) to determine

the angle of the magnet. The TADC is tracking the angle of the

magnet with cycle time of 2μs (typ. 1.4). Once the TADC is

synchronized with the angle, it sets the LOCK bit in the status

[2μs (typ. 1.4)] to track the moving magnet. The AS5132 can

operate in locked mode at rotational speeds up to max.

72,900 rpm.

Effect of Hysteresis

CW rotation

CCW rotation

Magnet Position

Angle Output

123456

-1

Hysteresis counter startup value

Counter Range: 3 LSB

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