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AS5311 Datasheet(PDF) 10 Page - ams AG |
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AS5311 Datasheet(HTML) 10 Page - ams AG |
10 / 23 page AS5311 Data Sheet www.austriamicrosystems.com Revision 1.01 10 - 23 6.6.2 Pulse Width Modulation Output Operating conditions: Tamb = -40 to +125°C, VDD5V = 3.0~3.6V (3V operation) VDD5V = 4.5~5.5V (5V operation) unless otherwise noted. Parameter Symbol Min Typ Max Unit Note 232 244 256 Signal period = 4098µs ±5% at Tamb = 25°C PWM frequency f PWM 220 244 268 Hz = 4098µs ±10% at Tamb = -40 to +125°C Minimum pulse width PW MIN 0.9 1 1.1 µs Position 0d =0µm Maximum pulse width PW MAX 3892 4097 4301 µs Position 4095d = 1999.5µm 7 Detailed Description The different types of outputs relative to the magnet position are outlined in Figure 5 below. The absolute serial output counts from 0….4095 within one pole pair and repeats with each subsequent pole pair. Likewise, the PWM output starts with a pulse width of 1µs, increases the pulse width with every step of 0.488µm and reaches a maximum pulse width of 4097µs at the end of each pole pair. An index pulse is generated once for every pole pair. 256 incremental pulses are generated at each output A and B for every pole pair. The outputs A and B are phase shifted by 90 electrical degrees, which results in 1024 edges per pole pair. As the incremental outputs are also repeated with every pole pair, a constant train of pulses is generated as the magnet moves over the chip. Figure 5: AS5311 Outputs Relative to Magnet Position |
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