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| 型号： | AS5245 DB |
| 厂商： | ams |
| 文件页数： | 27/32页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO AS5245 |
| 标准包装： | 1 |
| 传感器类型： | 磁性，旋转位置 |
| 传感范围： | 360° |
| 接口： | USB |
| 电源电压： | 5V USB 或 9V |
| 嵌入式： | 是，MCU，8 位 |
| 已供物品： | 板，线缆 |
| 已用 IC / 零件： | AS5245 |
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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
Incremental Mode. Incremental encoders are usually required to produce no missing pulses up to several thousand rpms. Therefore, the
AS5245 has a built-in interpolator, which ensures that there are no missing pulses at the incremental outputs for rotational speeds of up to
30.000 rpm, even at the highest resolution of 10 bits (512 pulses per revolution).
9.6.4
Propagation Delays
The propagation delay is the delay between the time that the sample is taken until it is converted and available as angular data. This delay is
96μs in fast mode and 384μs in slow mode.
Using the SSI interface for absolute data transmission, an additional delay must be considered, caused by the asynchronous sampling (0 … 1/
fsample) and the time it takes the external control unit to read and process the angular data from the chip (maximum clock rate = 1MHz, number
of bits per reading = 18).
Angular Error Caused by Propagation Delay. A rotating magnet will cause an angular error caused by the output propagation delay.
This error increases linearly with speed:
e sampling = rpm * 6 * prop.delay
(EQ 5)
Where:
esampling = angular error [o]
rpm = rotating speed [rpm]
prop.delay = propagation delay [seconds]
Note: Since the propagation delay is known, it can be automatically compensated by the control unit processing the data from the AS5245.
9.6.5
Internal Timing Tolerance
The AS5245 does not require an external ceramic resonator or quartz. All internal clock timings for the AS5245 are generated by an on-chip RC
oscillator. This oscillator is factory trimmed to ±5% accuracy at room temperature (±10% over full temperature range). This tolerance influences
the ADC sampling rate and the pulse width of the PWM output:
Absolute Output; SSI Interface: A new angular value is updated every 96μs (typ) in fast mode and every 384μs (typ) in slow mode.
PWM Output: A new angular value is updated every 400μs (typ). The PWM pulse timings t ON and t OFF also have the same tolerance as
the internal oscillator. If only the PWM pulse width t ON is used to measure the angle, the resulting value also has this timing tolerance.
However, this tolerance can be cancelled by measuring both t ON and t OFF and calculating the angle from the duty cycle (see Pulse Width
Modulation (PWM) Output on page 15) .
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).
t on ? 4097
( t on + t off )
Position = ------------------------- – 1
(EQ 6)
9.6.6
Temperature
Magnetic Temperature Coefficient. One of the major benefits of the AS5245 compared to linear Hall sensors is that it is much less
sensitive to temperature. While linear Hall sensors require a compensation of the magnet’s temperature coefficients, the AS5245 automatically
compensates for the varying magnetic field strength over temperature. The magnet’s temperature drift does not need to be considered, as the
AS5245 operates with magnetic field strengths from ±45…±75mT.
Example:
A NdFeB magnet has a field strength of 75mT @ -40oC and a temperature coefficient of -0.12% per Kelvin. The temperature change is from -40o
to +125o = 165K.The magnetic field change is: 165 x -0.12% = -19.8%, which corresponds to 75mT at -40oC and 60mT at 125oC.
The AS5245 can compensate for this temperature related field strength change automatically, no user adjustment is required.
9.6.7
Accuracy over Temperature
The influence of temperature in the absolute accuracy is very low. While the accuracy is less than or equal to ±0.5o at room temperature, it may
increase to less then or equal to ±0.9o due to increasing noise at high temperatures.
www.austriamicrosystems.com/AS5245
Revision 1.5
26 - 31
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AS5245-HMFM | 功能描述:IC ENCODER ROTARY 32-QFN 制造商:ams 系列:汽车级，AEC-Q100 零件状态:有效 编码器类型:磁性 输出类型:正交（增量） 每转脉冲数:- 电压 - 电源:3 V ~ 3.6 V，4.5 V ~ 5.5 V 致动器类型:外磁铁，不含 棘爪:无 内置开关:无 安装类型:表面贴装 朝向:- 端子类型:SMD（SMT）接片 旋转寿命（最少次数）:- 标准包装:1 |
| AS5245-HMFP | 功能描述:IC ENCODER ROTARY 32QFN 制造商:ams 系列:汽车级，AEC-Q100 零件状态:有效 编码器类型:磁性 输出类型:正交（增量） 每转脉冲数:- 电压 - 电源:3 V ~ 3.6 V，4.5 V ~ 5.5 V 致动器类型:外磁铁，不含 棘爪:无 内置开关:无 安装类型:表面贴装 朝向:- 端子类型:SMD（SMT）接片 旋转寿命（最少次数）:- 标准包装:4,000 |
| AS5245HQFT | 制造商:ams 功能描述:QFN 32 |
| AS5245-HQFT | 功能描述:IC ENCODER PROG 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 |
| AS5245HQFT500 | 制造商:ams 功能描述:T&R / QFN 32 |
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