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AS5140H Datasheet(PDF) 5 Page - ams AG |
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AS5140H Datasheet(HTML) 5 Page - ams AG |
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5 / 55 page  ams Datasheet Page 5 [v1-09] 2018-Feb-20 Document Feedback AS5140H − Pin Assignment Note(s): Both modes (mode 1.x and mode 2.x) provide an index signal (1 pulse/revolution) with an adjustable width of one LSB or three LSB’s. Mode 3.x: Brushless DC Motor Commutation Mode In addition to the absolute encoder output over the SSI interface, this mode provides commutation signals for brushless DC motors with either one pole pair or two pole pair rotors. The commutation signals are usually provided by 3 discrete Hall switches, which are no longer required, as the AS5140H can fulfill two tasks in parallel: absolute encoder + BLDC motor commutation. In this mode, • Pin 12 provides the LSB output instead of the PWM (Pulse-Width-Modulation) signal. • Pin 8 (Prog) is also used to program the different incremental interface modes, the incremental resolution and the zero position into the OTP (see Incremental Mode Programming). This pin is also used as digital input to shift serial data through the device in Daisy Chain configuration, (see Figure 24). • Pin 11 Chip Select (CSn; active low) selects a device within a network of AS5140H encoders and initiates serial data transfer. A logic high at CSn puts the data output pin (DO) to tri-state and terminates serial data transfer. This pin is also used for alignment mode (see Alignment Mode) and programming mode (see Programming the AS5140H). • Pin 12 allows a single wire output of the 10-bit absolute position value. The value is encoded into a pulse width modulated signal with 1μs pulse width per step (1μs to 1024μs over a full turn). By using an external low pass filter, the digital PWM signal is converted into an analog voltage, allowing a direct replacement of potentiometers. |
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