AS5040-ASST View Datasheet(PDF) - austriamicrosystems AG
Part Name
Description
MFG CO.
'AS5040-ASST' PDF : 61 Pages View PDF
AS5040 − Programming the AS5040
Incremental Mode Programming
Three different incremental output modes are available.
Mode: Md1=0 / Md0=1 sets the AS5040 in quadrature
mode.
Mode: Md1=1 / Md0=0 sets the AS5040 in step / direction
mode (see Figure 5).
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 Figure 36 below).
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).
To allow programming of all bits, the default factory setting is
all bits = 0. This mode is equal to mode 0:0 (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 33) allows 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 30000 rpm.
Page 32
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ams Datasheet
[v2-12] 2017-Jun-20
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