参数资料
型号: AS5045 PB
厂商: ams
文件页数: 18/34页
文件大小: 0K
描述: BOARD PROGRAM AS5045
标准包装: 1
模块/板类型: ZIF 插口
适用于相关产品: AS5000 编程器,AS5045
AS5045
Data Sheet
9.1 Changing the PWM Frequency
The PWM frequency of the AS5045 can be divided by two by setting a bit (PWMhalfEN) in the OTP register (see
chapter 11). With PWMhalfEN = 0 the PWM timing is as shown in Table 6 :
Table 6. PWM Signal Parameters (default mode)
Parameter
PWM frequency
MIN pulse width
MAX pulse width
Symbol
f PWM
PW MIN
PW MAX
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 7 :
Table 7. PWM Signal Parameters with Half Frequency (OTP option)
Parameter
PWM frequency
MIN pulse width
MAX pulse width
Symbol
f PWM
PW MIN
PW MAX
Typ
122
2
8192
Unit
Hz
μs
μs
Note
Signal period: 8194μs
- Position 0d
- Angle 0 deg
- Position 4095d
- Angle 359.91 deg
10 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: 0°= 0V; 360° = VDD5V.
Using this method, the AS5045 can be used as direct replacement of potentiometers.
Figure 9. Simple 2
nd
Order Passive RC Low Pass Filter
Figure 9 shows an example of a simple passive low pass filter to generate the analog output.
R1, R2 ≥ 4k7
C1, C2 ≥ 1μF / 6V
R1 should be ≥ 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.
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Revision 1.7
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