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參數資料
| 型號： | AS5140H-ASST |
| 廠商： | ams |
| 文件頁數： | 28/38頁 |
| 文件大?。?/td> | 1279K |
| 描述： | IC ENCODER ROTARY 10BIT 16-SSOP |
| 標準包裝： | 2,000 |
| 傳感范圍： | 45mT ~ 75mT |
| 類型： | 線性，旋轉編碼器 - 可編程 |
| 電源電壓： | 3 V ~ 3.6 V，4.5 V ~ 5.5 V |
| 電流 - 電源： | 21mA |
| 電流 - 輸出（最大）： | 4mA |
| 輸出類型： | 數字式，PWM，10 位串行 |
| 特點： | 可編程 |
| 工作溫度： | -40°C ~ 150°C |
| 封裝/外殼： | * |
| 供應商設備封裝： | * |
| 包裝： | * |
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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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相關代理商/技術參數 |
參數描述 |
|---|---|
| AS5140H-ASST-500 | 功能描述:板機接口霍耳效應/磁性傳感器 RoHS:否 制造商:Honeywell 類型:Bipolar Hall-Effect Digital Position Sensor 工作電源電壓:3 V to 24 V 電源電流:3.5 mA 最大輸出電流:20 mA 工作點最小值/最大值:5 G, 55 G 最小/最大釋放點（Brp）:- 55 G, - 5 G 最大工作溫度:+ 150 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23 |
| AS5140HASSU | 制造商:AMSCO 制造商全稱: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 類別:傳感器，轉換器 >> 磁性 - 霍爾效應，數字式開關，線性，羅盤 (IC) 系列:- 標準包裝:1 系列:- 傳感范圍:20mT ~ 80mT 類型:旋轉 電源電壓:4.5 V ~ 5.5 V 電流 - 電源:15mA 電流 - 輸出（最大）:- 輸出類型:數字式，PWM，8.5 位串行 特點:可編程 工作溫度:-40°C ~ 150°C 封裝/外殼:20-SSOP（0.209"，5.30mm 寬） 供應商設備封裝:20-SSOP 包裝:Digi-Reel® 其它名稱: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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