AS5145 AB austriamicrosystems, AS5145 AB Datasheet - Page 18

• Manufacturer Part Number: AS5145 AB
• Description: BOARD ADAPTER AS5145
• Manufacturer: austriamicrosystems

Specifications of AS5145 AB

• Sensor Type: Magnetic, Rotary Position
• Sensing Range: 360°
• Interface: Serial
• Voltage - Supply: 5V
• Embedded: No
• Utilized Ic / Part: AS5145
• Lead Free Status / RoHS Status: Lead free by exemption / RoHS compliant by exemption
• Sensitivity: -

AS5145
Data Sheet - D e t a i l e d D e s c r i p t i o n
8.2.1 Changing the PWM Frequency
The PWM frequency of the AS5145 can be divided by two by setting a bit (PWMhalfEN) in the OTP register
page
Table 11. PWM Signal Parameters (Default mode)
When PWMhalfEN = 1, the PWM timing is as shown in
Table 12. PWM Signal Parameters with Half Frequency (OTP option)
8.3 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 = V
Using this method, the AS5145 can be used as direct replacement of potentiometers.
Figure 12. Figure 11: Simple 2nd Order Passive RC Low Pass Filter
Figure 11
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/AS5145
19). With PWMhalfEN = 0 the PWM timing is as shown in
Symbol
Symbol
PW
PW
PW
PW
f
shows an example of a simple passive low pass filter to generate the analog output.
f
PWM
PWM
MAX
MAX
MIN
MIN
MAX pulse width
MAX pulse width
PWM frequency
MIN pulse width
PWM frequency
MIN pulse width
Pin12
PWM
Parameter
Parameter
Pin7
VSS
DD
5V.
R1,R2
R1
Table
≥
C1
10kΩ
12:
Table
R2
Revision 1.11
C1,C2
4097
Typ
244
11:
8194
Typ
122
C2
1
2
≥
2.2µF / 6V
analog out
VDD
0V
Unit
Hz
µs
µs
Unit
0º
Hz
µs
µs
360º
(see Programming the AS5145 on
Signal period: 4097µs
Signal period: 8194µs
- Angle 359.91 deg
- Angle 359.91 deg
- Position 4095d
- Position 4095d
- Angle 0 deg
- Position 0d
- Angle 0 deg
- Position 0d
Note
Note
(EQ 2)
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