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AS5134
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
8.3 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. The multi turn value is encoded as complement on two. Clockwise rotation
gives increasing angle values and positive turn count. Counter clockwise rotation exhibits decreasing angle values and a negative turn count
respectively.
Bit Code
011111111
---
01111111
---
00000011
00000010
00000001
00000000
11111111
11111110
11111101
---
10000000
---
100000000
Decimal Value
256
---
127
---
+3
+2
+1
0
-1
-2
-3
---
-128
---
-255
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.
8.4 High Speed Operation
The AS5134 is using a fast tracking ADC (TADC) to determine the angle of the magnet. Once the TADC is synchronized with the angle, it sets
the LOCK bit in the status register. In worst case, usually at start-up, the TADC requires up to 179 steps to lock. Once it is locked, it requires only
one cycle to track the moving magnet. The AS5134 can operate in locked mode at rotational speeds up to 76875 rpm.
In Low Power Mode, the position of the TADC is frozen. It will continue from the frozen position once it is powered up again. If the magnet has
moved during the power down phase, several cycles will be required before the TADC is locked again. The tracking time to lock in with the new
magnet angle can be roughly calculated as:
t LOCK = --------------------------------------------------------------------------
2 ? s ? NewAngle – OldAngle
1.406
Where:
t LOCK = Time required to acquire the new angle after power up from one of the reduced power modes [μs]
OldAngle = Angle position when one of the reduced power modes is activated [o]
NewAngle = Angle position after resuming from reduced power mode [o]
(EQ 1)
8.4.1
Propagation Delay
The Propagation delay is the time required from reading the magnetic field by the Hall sensors to calculating the angle and making it available on
the serial or PWM interface. While the propagation delay is usually negligible on low speeds, it is an important parameter at high speeds. The
longer the propagation delay, the larger becomes the angle error for a rotating magnet as the magnet is moving while the angle is calculated. The
position error increases linearly with speed. The main factors that contribute to the propagation delay are discussed in detail further in this
document.
www.austriamicrosystems.com/AS5134
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