参数资料
型号: AS5245 DB
厂商: ams
文件页数: 17/32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
AS5245
Data Sheet - D e t a i l e d D e s c r i p t i o n
Changing the PWM Frequency
The PWM frequency of the AS5245 can be divided by two by setting a bit (PWMhalfEN) in the OTP register (see Programming the AS5245 on
page 17) . With PWMhalfEN = 0, the PWM timing is as shown in Table 10 :
Table 10. PWM Signal Parameters (Default mode)
Symbol
f PWM
PW MIN
PW MAX
Parameter
PWM frequency
MIN pulse width
MAX pulse width
Typ
244
1
4096
Unit
Hz
μs
μs
Note
Signal period: 4097μs
- Position 0d
- Angle 0 deg
- Position 4095d
- Angle 359,91 deg
When PWMhalfEN = 1, the PWM timing is as shown in Table 11 :
Table 11. PWM Signal Parameters with Half Frequency (OTP option)
Symbol
f PWM
PW MIN
PW MAX
Parameter
PWM frequency
MIN pulse width
MAX pulse width
Typ
122
2
8192
Unit
Hz
μs
μs
Note
- Position 0d
- Angle 0 deg
- Position 4095d
- Angle 359,91 deg
- Position 0d
- Angle 0 deg
8.4 Analog Output
An analog output can be generated by averaging the PWM signal, using an external active or passive low pass filter. The analog output voltage
is proportional to the angle: 0o= 0V; 360o = VDD5V.
Using this method, the AS5245 can be used as direct replacement of potentiometers.
Figure 12. Simple 2nd Order Passive RC Low Pass Filter
Pin12
PWM
R1
C1
R2
C2
analog out
VDD
Pin7
0V
0o
360o
VSS
Figure 12 shows an example of a simple passive low pass filter to generate the analog output.
R1,R2 ≥ 4k7
C1,C2 ≥ 1μF / 6V
(EQ 2)
R1 should be greater than or equal to 4k7 to avoid loading of the PWM output. Larger values of Rx and Cx will provide better filtering and less
ripple, but will also slow down the response time.
www.austriamicrosystems.com/AS5245
Revision 1.5
16 - 31
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