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AS5140H Datasheet(PDF) 21 Page - ams AG |
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AS5140H Datasheet(HTML) 21 Page - ams AG |
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21 / 37 page  www.austriamicrosystems.com/AS5140H Revision 1.4 21 - 37 AS5140H Data Sheet - D e t a i l e d D e s c r i p t i o n Figure 14. OTP Access Timing Diagram 7.6.6 Incremental Mode Programming The following three different incremental output modes are available: Mode: Md1=0 / Md0=1 sets the AS5140H in quadrature mode. Mode: Md1=1 / Md0=0 sets the AS5140H in step / direction mode (see Table 2). In both modes listed above, the incremental resolution may be reduced from 10 bit down to 9, 8 or 7 bit using the divider OTP bits Div1 and Div0 (see Table 20 below). Mode: Md1=1 / Md0=1 sets the AS5140H in brushless DC motor commutation mode with an additional LSB incremental signal at pin 12 (PWM_LSB). To allow programming of all bits, the default factory setting is all bits = 0. This mode is equal to mode 1:0 (quadrature A/B, 1LSB index width, 256ppr). The absolute angular output value, by default, increases with clockwise rotation of the magnet (top view). Setting the CCW-bit (see Table 19) allows for reversing the indicated direction, e.g. when the magnet is placed underneath the IC: - CCW = 0 – angular value increases clockwise; - CCW = 1 – angular value increases counterclockwise. By default, the zero / index position pulse is one LSB wide. It can be increased to a three LSB wide pulse by setting the Index-bit of the OTP register. Further programming options (commutation modes) are available for brushless DC motor-control. Md1 = Md0 = 1 changes the incremental output pins 3, 4 and 6 to a 3-phase commutation signal. Div1 defines the number of pulses per revolution for either a two-pole (Div1=0) or four-pole (Div1=1) rotor. In addition, the LSB is available at pin 12 (the LSB signal replaces the PWM-signal), which allows for high rotational speed measurement of up to 10.000 rpm. OTP Access Setup Condition Operation Mode Selection Exit Condition CSn PROG CLK |
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