AS5040_1 AMSCO [austriamicrosystems AG], AS5040_1 Datasheet - Page 18

• Manufacturer Part Number: AS5040_1
• Description: 10Bit 360 Programmable Magnetic Rotary Encoder
• Manufacturer: AMSCO [austriamicrosystems AG]

AS5040
Data Sheet
Figure 16: OTP Programming Connection of AS5040 (shown with AS5040 demoboard)
Incremental Mode Programming
Three different incremental output modes are available.
In both modes, 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 6 below ).
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 Figure 14) allows reversing the indicated direction, e.g. when the magnet is placed
underneath the IC:
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 30,000 rpm.
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Mode: Md1=0 / Md0=1 sets the AS5040 in quadrature mode.
Mode: Md1=1 / Md0=0 sets the AS5040 in step / direction mode (see Table 1)
Mode: Md1=1 / Md0=1 sets the AS5040 in brushless DC motor commutation mode with an additional LSB
incremental signal at pin 12 (PWM_LSB).
CCW = 0 – angular value increases clockwise;
CCW = 1 – angular value increases counterclockwise.
Revision 2.10
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