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| 型号： | AS5030-ATSU |
| 厂商： | ams |
| 文件页数： | 29/44页 |
| 文件大小： | 0K |
| 描述： | IC ENCODER ROTARY 8-BIT 16-TSSOP |
| 应用说明： | AS5000 Series Magnet Selection Guide AS5000 Series Magnets for Extended Vertical Range |
| 标准包装： | 96 |
| 传感范围： | 23.6mT ~ 44.5mT |
| 类型： | 线性，旋转编码器 - 可编程 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 电流 - 电源： | 14mA |
| 电流 - 输出（最大）： | 4mA |
| 输出类型： | 数字，PWM |
| 特点： | 可编程 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 管件 |
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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
+5 V
VDD
VDD
LED 1
1k
13
VDD
Micro
Controller
Output
Output
1
11
10
MagRngn
CS
CLK
AS5030
100n
I/O
12
DI O
VSS
C1
14
C2
15
VSS
3
VSS
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:
(EQ 3)
t LOCK = 1 . 15 μ s ? NewPos ? OldPos
Where:
t LOCK = time required to acquire the new angle after power up from one of the reduced power modes [μs]
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. For high speed applications, fast ADCs are essential. The ADC sampling rate directly influences the propagation delay.
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.ams.com/AS5030
Revision 2.4
29 - 44
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