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参数资料
| 型号： | AS5245-HQFT |
| 厂商： | ams |
| 文件页数： | 26/32页 |
| 文件大小： | 0K |
| 描述： | IC ENCODER PROG 32-QFN |
| 应用说明： | AS5000 Series Magnet Selection Guide AS5000 Series Magnets for Extended Vertical Range |
| 标准包装： | 4,000 |
| 传感范围： | 45mT ~ 75mT |
| 类型： | 线性，旋转编码器 - 可编程 |
| 电源电压： | 3 V ~ 3.6 V，4.5 V ~ 5.5 V |
| 电流 - 电源： | 21mA |
| 电流 - 输出（最大）： | 4mA |
| 输出类型： | 正交，带刻度角（增量） |
| 特点： | 可编程 |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | 32-VQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN（7x7） |
| 包装： | 带卷 (TR) |
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AS5245
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
Figure 18.
Example of Linearity Error Over 360 o
0.5
0.4
0.3
0.2
0.1
0
Err max
transition noise
-0.1
1
55
109
163
217
271
325
379
433
487
541
595
Err min
649
703
757
811
865
919
973
-0.2
-0.3
-0.4
-0.5
9.6.2
Transition Noise
outputs. It is specified as 0.06 degrees rms (1 sigma) in fast mode (pin MODE = high) and 0.03 degrees rms (1 sigma) in slow mode (pin MODE
Transition noise is defined as the jitter in the transition between two steps. Due to the nature of the measurement principle (Hall sensors +
Preamplifier + ADC), there is always a certain degree of noise involved. This transition noise voltage results in an angular transition noise at the
1
= low or open). This is the repeatability of an indicated angle at a given mechanical position. The transition noise has different implications on the
type of output that is used:
Absolute Output; SSI Interface: The transition noise of the absolute output can be reduced by the user by implementing averaging of
readings. An averaging of 4 readings will reduce the transition noise by 6dB or 50%, e.g. from 0.03o rms to 0.015o rms (1 sigma) in slow
mode.
PWM Interface: If the PWM interface is used as an analog output by adding a low pass filter, the transition noise can be reduced by lower-
ing the cutoff frequency of the filter. If the PWM interface is used as a digital interface with a counter at the receiving side, the transition
noise may again be reduced by averaging of readings.
Incremental Mode: In incremental mode, the transition noise influences the period, width and phase shift of the output signals A, B and
Index. However, the algorithm used to generate the incremental outputs guarantees no missing or additional pulses even at high speeds (up
to 30.000 rpm and higher).
9.6.3
High Speed Operation
Sampling Rate. The AS5245 samples the angular value at a rate of 2.61k (slow mode) or 10.42k (fast mode, selectable by pin MODE)
samples per second. Consequently, the absolute outputs are updated each 384μs (96μs in fast mode). At a stationary position of the magnet,
the sampling rate creates no additional error.
Absolute Mode. At a sampling rate of 2.6kHz/10.4kHz, the number of samples (n) per turn for a magnet rotating at high speed can be
calculated by,
-----------------------------------
---------------------------
n slowmode =
n fastmode =
60
rpm ? ( 384 ) μ s
60
rmp ? 96 μ s
(EQ 3)
(EQ 4)
The upper speed limit in slow mode is ~6.000rpm and ~30.000rpm in fast mode. The only restriction at high speed is that there will be fewer
samples per revolution as the speed increases (see Table 6) . Regardless of the rotational speed, the absolute angular value is always sampled
at the highest resolution of 12 bit.
1. Statistically, 1 sigma represents 68.27% of readings; 3 sigma represents 99.73% of readings.
www.austriamicrosystems.com/AS5245
Revision 1.5
25 - 31
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| AS5245HQFT500 | 制造商:ams 功能描述:T&R / QFN 32 |
| AS5245-HQFT-500 | 功能描述:IC ENCODER ROTARY 32-QFN RoHS:是 类别:传感器，转换器 >> 磁性 - 霍尔效应，数字式开关，线性，罗盘 (IC) 系列:- 标准包装:1 系列:- 传感范围:20mT ~ 80mT 类型:旋转 电源电压:4.5 V ~ 5.5 V 电流 - 电源:15mA 电流 - 输出（最大）:- 输出类型:数字式，PWM，8.5 位串行 特点:可编程 工作温度:-40°C ~ 150°C 封装/外壳:20-SSOP（0.209"，5.30mm 宽） 供应商设备封装:20-SSOP 包装:Digi-Reel® 其它名称:AS5132-HSST-500DKR |
| AS5245-QF_EK_AB | 功能描述:AS5245 - Magnetic, Rotary Position Sensor Evaluation Board 制造商:ams 系列:- 零件状态:有效 传感器类型:磁性，旋转位置 感应范围:360° 接口:串行 灵敏度:- 电压 - 电源:3.3V，5V 嵌入式:否 所含物品:板 使用的 IC/零件:AS5245 标准包装:1 |
| AS5245-QF_EK_DB | 功能描述:AS5245 - Magnetic, Rotary Position Sensor Evaluation Board 制造商:ams 系列:- 零件状态:有效 传感器类型:磁性，旋转位置 感应范围:360° 接口:USB 灵敏度:- 电压 - 电源:5V USB 或 9V 嵌入式:是，MCU，8 位 所含物品:板，线缆 使用的 IC/零件:AS5245 标准包装:1 |
| AS5245-QF_EK_PB | 功能描述:AS5245 - ZIF Socket 制造商:ams 系列:- 零件状态:有效 模块/板类型:ZIF 插口 配套使用产品/相关产品:AS5245 标准包装:1 |
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