AS5040-ASST View Datasheet(PDF) - austriamicrosystems AG
Part Name
Description
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AS5040-ASST Datasheet PDF : 61 Pages
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AS5040 − Pin Assignment
Figure 6:
Pin Description SSOP16
Mode 1.x: Quadrature A/B Output
Represents the default quadrature A/B signal mode.
Mode 2.x: Step / Direction Output
Configures pin 3 to deliver up to 512 pulses (up to 1024 state
changes) per revolution. It is equivalent to the LSB (least
significant bit) of the absolute position value. Pin 4 provides the
information of the rotational direction.
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
AS5040 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.
This pin is also used as digital input to shift serial data through
the device in Daisy Chain configuration.
Pin 11 Chip Select (CSn; active low) selects a device within a
network of AS5040 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 and Programming the AS5040.
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.
Pin
Symbol
1
MagINCn
2
MagDECn
Type
DO_OD
DO_OD
Description
Magnet Field Magnitude INCrease; active low, indicates a
distance reduction between the magnet and the device surface.
Magnet Field Magnitude DECrease; active low, indicates a
distance increase between the device and the magnet.
ams Datasheet
[v2-12] 2017-Jun-20
Page 5
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