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| 型号： | AS5245 DB |
| 厂商： | ams |
| 文件页数： | 24/32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
9.5 Failure Diagnostics
The AS5245 also offers several diagnostic and failure detection features, which are discussed in detail further in the document.
9.5.1
Magnetic Field Strength Diagnosis
By Software: The MagINC and MagDEC status bits will both be high when the magnetic field is out of range.
By Hardware: Pins #1 (MagINCn) and #2 (MagDECn) are open-drain outputs and will both be turned on (= low with external pull-up resistor)
when the magnetic field is out of range. If only one of the outputs are low, the magnet is either moving towards the chip (MagINCn) or away from
the chip (MagDECn).
9.5.2
Power Supply Failure Detection
By Software: If the power supply to the AS5245 is interrupted, the digital data read by the SSI will be all “0”s. Data is only valid, when bit OCF is
high, hence a data stream with all “0”s is invalid. To ensure adequate low levels in the failure case, a pull-down resistor (~10k Ω ) should be added
between pin DIO and VSS at the receiving side.
By Hardware: The MagINCn and MagDECn pins are open drain outputs and require external pull-up resistors. In normal operation, these pins
are high ohmic and the outputs are high (see Table 8) . In a failure case, either when the magnetic field is out of range of the power supply is
missing, these outputs will become low. To ensure adequate low levels in case of a broken power supply to the AS5245, the pull-up resistors
(~10k Ω ) from each pin must be connected to the positive supply at pin 16 (VDD5V).
By Hardware, PWM Output: The PWM output is a constant stream of pulses with 1kHz repetition frequency. In case of power loss, these pulses
are missing.
9.6 Angular Output Tolerances
9.6.1
Accuracy
Accuracy is defined as the error between measured angle and actual angle. It is influenced by several factors:
The non-linearity of the analog-digital converters,
Internal gain and mismatch errors,
Non-linearity due to misalignment of the magnet.
As a sum of all these errors, the accuracy with centered magnet = (Err max – Err min )/2 is specified as better than ±0.5 degrees @ 25oC (see
Figure 19) .
Misalignment of the magnet further reduces the accuracy. Figure 18 shows an example of a 3D-graph displaying non-linearity over XY-
misalignment. The center of the square XY-area corresponds to a centered magnet (see dot in the center of the graph). The X- and Y- axis
extends to a misalignment of ±1mm in both directions. The total misalignment area of the graph covers a square of 2x2 mm (79x79mil) with a
step size of 100μm.
For each misalignment step, the measurement as shown in Figure 19 is repeated and the accuracy (Err max – Err min )/2 (e.g. 0.25o in Figure 19 ) is
entered as the Z-axis in the 3D-graph.
www.austriamicrosystems.com/AS5245
Revision 1.5
23 - 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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