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| 型号： | AS5140H-ASST |
| 厂商： | ams |
| 文件页数： | 28/38页 |
| 文件大小： | 1279K |
| 描述： | IC ENCODER ROTARY 10BIT 16-SSOP |
| 标准包装： | 2,000 |
| 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： | 数字式，PWM，10 位串行 |
| 特点： | 可编程 |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
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www.austriamicrosystems.com/AS5140H
Revision 1.4
27 - 37
AS5140H
Data Sheet - Detailed Description
The angular displacement (? of the magnetic source with reference to the Hall sensor array may then be modelled by:
?SPAN class="pst AS5140H-ASST_2598942_5"> = arctan
?0.5?/DIV>
(EQ 5)
The ?.5?angular error assumes a magnet optimally aligned over the center of the die and is a result of gain mismatch errors of the AS5140H.
Placement tolerances of the die within the package are ?.235mm in X and Y direction, using a reference point of the edge of pin #1 (Figure 21).
In order to neglect the influence of external disturbing magnetic fields, a robust differential sampling and ratiometric calculation algorithm has
been implemented. The differential sampling of the sine and cosine vectors removes any common mode error due to DC components introduced
by the magnetic source itself or external disturbing magnetic fields. A ratiometric division of the sine and cosine vectors removes the need for an
accurate absolute magnitude of the magnetic field and thus accurate Z-axis alignment of the magnetic source.
The recommended differential input range of the magnetic field strength (B
(X1-X2)
,B
(Y1-Y2)
) is ?5mT at the surface of the die. In addition to this
range, an additional offset of ?mT, caused by unwanted external stray fields is allowed. The chip will continue to operate, but with degraded
output linearity, if the signal field strength is outside the recommended range. Too strong magnetic fields will introduce errors due to saturation
effects in the internal preamplifiers. Too weak magnetic fields will introduce errors due to noise becoming more dominant.
7.11 Failure Diagnostics
The AS5140H also offers several diagnostic and failure detection features, which are discussed in detail further in the document.
7.11.1 Magnetic Field Strength Diagnosis
By Software: The MagINCn and MagDECn 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 is low, the magnet is either moving towards the chip (MagINCn) or away from
the chip (MagDECn).
7.11.2 Power Supply Failure Detection
By Software: If the power supply to the AS5140H 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? should be
added between pin DO 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 16). In a failure case, either when the magnetic field is out of range or the power supply is
missing, these outputs will become low. To ensure adequate low levels in case of a broken power supply to the AS5140H, the pull-up resistors
(>10k? 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.
By Hardware - Incremental Outputs: In normal operation, pins A(#3), B(#4) and Index (#6) will never be high at the same time, as Index is only
high when A=B=low. However, after a power-on-reset, if VDD is powered up or restarts after a power supply interruption, all three outputs will
remain in high state until pin CSn is pulled low. If CSn is already tied to VSS during power-up, the incremental outputs will all be high until the
internal offset compensation is finished (within t
PwrUp
).
7.12 Angular Output Tolerances
7.12.1 Accuracy
Accuracy is defined as the error between the measured angle and the 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 ?.5 degrees @ 25篊 (see
Figure 23). Misalignment of the magnet further reduces the accuracy. Figure 22 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 ?mm in both directions. The total misalignment area of the graph covers a square of 2x2 mm (79x79mil) with a
step size of 100祄. For each misalignment step, the measurement as shown in Figure 23 is repeated and the accuracy (Err
max
Err
min
)/2 (e.g.
0.25?in Figure 23) is entered as the Z-axis in the 3D-graph.
Y1 Y2
(
)
X1 X2
(
)
---------------- ------- -
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AS5140H-ASST-500 | 功能描述:板机接口霍耳效应/磁性传感器 RoHS:否 制造商:Honeywell 类型:Bipolar Hall-Effect Digital Position Sensor 工作电源电压:3 V to 24 V 电源电流:3.5 mA 最大输出电流:20 mA 工作点最小值/最大值:5 G, 55 G 最小/最大释放点（Brp）:- 55 G, - 5 G 最大工作温度:+ 150 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23 |
| AS5140HASSU | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:10-Bit 360 Programmable Magnetic Rotary Encoder For High Ambient Temperatures |
| AS5140H-ASSU | 功能描述:IC ENCODER PROG 10-BIT 16-SSOP 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 |
| AS5140H-DB | 制造商:ams 功能描述:AS5140H Demo Board |
| AS5140H-PB | 制造商:ams 功能描述:AS5140H Progamming Board |
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