AS5030 AB austriamicrosystems, AS5030 AB Datasheet - Page 29

• Manufacturer Part Number: AS5030 AB
• Description: BOARD ADAPTER AS5030
• Manufacturer: austriamicrosystems

Specifications of AS5030 AB

• Sensor Type: Magnetic, Rotary Position
• Sensing Range: 360°
• Interface: Serial
• Voltage - Supply: 5V
• Embedded: No
• Utilized Ic / Part: AS5030
• Lead Free Status / RoHS Status: Lead free by exemption / RoHS compliant by exemption
• Sensitivity: -

AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Figure 24. Magnetic Field Strength Indicator
8.6 High Speed Operation
The AS5030 is using a fast tracking ADC (TADC) to determine the angle of the magnet. The TADC has a tracking rate of 1.15µs (typ).
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 a
maximum of 127 steps (127 * 1.15µS = 146.05µs) to lock. Once it is locked, it requires only one cycle (1.15µs) to track the moving magnet.
The AS5030 can operate in locked mode at rotational speeds up to 30.000 rpm.
In Low Power Mode or Ultra 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:
Where:
t
OldPos = Angle position when one of the reduced power modes is activated [°]
NewPos = Angle position after resuming from reduced power mode [°]
8.6.1 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 contributing to the propagation delay are:
ADC Sampling Rate.
The fast tracking ADC used in the AS5030 with a tracking rate of only 1.15µs (typ.) is a perfect fit for both high speed and high performance.
www.austriamicrosystems.com/AS5030
LOCK
= time required to acquire the new angle after power up from one of the reduced power modes [µs]
VSS
For high speed applications, fast ADCs are essential. The ADC sampling rate directly influences the propagation delay.
+ 5 V
VDD
Micro
Controller
VDD
VSS
t
Output
Output
LOCK
I/O
=
. 1
15
LED 1
μ
s
∗
Revision 2.1
1 k
NewPos
10
12
11
1
MagRngn
CLK
D I O
CS
−
14
OldPos
C 1
13
VDD
15
AS5030
C 2
VSS
3
100n
29 - 44
(EQ 3)