参数资料
型号: AS5030 DB
厂商: ams
文件页数: 17/44页
文件大小: 0K
描述: BOARD DEMO AS5030
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 7.5V
嵌入式: 是,MCU,8 位
已供物品:
已用 IC / 零件: AS5030
AS5030
Datasheet - D e t a i l e d D e s c r i p t i o n
The minimum PWM pulse width t ON (PWM = high) is 1 LSB @ 0° (Angle reading = 00 H ).
1LSB = nom. 2.26μs.
The PWM pulse width increases with 1LSB per step. At the maximum angle 358.6° (Angle reading = FF H ),
the pulse width t ON (PWM = high) is 256 LSB and the pause width t OFF (PWM = low) is 1 LSB.
This leads to a total period (t ON + t OFF ) of 257LSB.
PWM out
5V
0V
2. 26 μs
578 . 56 μs
291. 54 μs
287. 02 μs
578. 56 μs
2. 26 μs
t on
t off
Position
0
Table 6. SSI Read-only Serial Bit Sequence (21-bit read)
128
255
Position
0
127
128
255
Angle
178.59
180°
358.59°
High
1
128
129
256
t_ high
2.26μs
287.02μs
291.54μs
578.56μs
Low
256
129
128
1
t_ low
578.56μs
291.54μs
287.02μs
2.26μs
Duty-Cycle
0.39%
49.4%
50.2%
99.6%
This means that the PWM pulse width is (position + 1) LSB, where position is 0….255.
The tolerance of the absolute pulse width and -frequency can be eliminated by calculating the angle with the duty cycle rather than with the
absolute pulse width:
(EQ 1)
angle [ 8 ? bit ] = ? ? 257
? ? ? 1
?
?
t ON
t ON + t OFF
?
?
results in an 8-bit value from 00 H to FF H ,
(EQ 2)
? ? ? 257
? ? ? 1 ?
angle [ ° ] =
360 ? ?
256 ? ?
t ON
t ON + t OFF
? ?
? ?
results in a degree value from 0° ~ 358.6°
Note: The absolute frequency tolerance is eliminated by dividing t ON by (t ON +T OFF ), as the change of the absolute timing effects both T ON
and T OFF in the same way.
www.ams.com/AS5030
Revision 2.4
17 - 44
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