AS5040(2004) View Datasheet(PDF) - austriamicrosystems AG
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AS5040 Datasheet PDF : 20 Pages
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AS5040 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
Pin Configuration
MagINCn
1
MagDECn
2
A_LSB_U 3
B_Dir_V 4
NC
5
Index_W 6
VSS
7
Prog 8
16 VDD5V
15
VDD3V3
14
NC
13 NC
12 PWM_LSB
11 CSn
10
CLK
9
DO
Figure 2: Pin configuration SSOP16
Pin Description
Table 2 shows the description of each pin of the standard
SSOP16 package (Shrink Small Outline Package, 16 leads,
body size: 5.3mm x 6.2mmm; see Figure 2).
Pins 7, 15 and 16 are supply pins, Pins 5, 13 and 14 are for
internal use and must not be connected.
Pins 1 and 2 are the magnetic field change indicators,
MagINCn and MagDECn (magnetic field strength increase
or decrease through variation of the distance between the
magnet and the device). These outputs can be used to
detect the valid magnetic field range. Furthermore those
indicators can also be used for contact-less push-button
functionality.
Pins 3, 4 and 6 are the incremental pulse output pins. The
functionality of these pins can be configured through
programming the one-time programmable (OTP) register:
Output mode
Pin3 Pin4
Pin6 Pin12
01 quadrature
A
B
Index PWM
02 single channel LSB direction Index PWM
03 commutation U
V
W
LSB
Table 1: pin assignment for the different incremental output modes
Pin Symbol Type Description
1
MagINCn
DO_OD
2
MagDECn DO_OD
3
A_LSB_U
DO
4
B_Dir_V
DO
5
NC
-
6
Index_ W
DO
7
VSS
S
8
Prog
DI_PD
9
DO
DO_T
10 CLK
DI,
ST
11 CSn
DI_PU,
ST
12 PWM_LSB DO
13 NC
-
14 NC
-
15 VDD3V3
S
16 VDD5V
S
Table 2: Pin description SSOP16
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.
Mode1: Quadrature A channel
Mode2: Least Significant Bit
Mode3: U signal (phase1)
Mode1: Quadrature B channel
quarter period shift to channel A.
Mode2: Direction of Rotation
Mode3: V signal (phase2)
must be left unconnected
Mode1 and Mode2 : Index
signal indicates the absolute
zero position
Mode3: W signal (phase3)
Negative Supply Voltage (GND)
Programming and Data Input for
Mode configuration, incremental
resolution setting, Zero-Position
Programming and Daisy Chain
mode configuration. Internal pull-
down resistor (~74kΩ)
Data Output of
Synchronous Serial Interface
Clock Input of
Synchronous Serial Interface;
Schmitt-Trigger input
Chip Select, active low; Schmitt-
Trigger input, internal pull-up
resistor (~50kΩ)
Pulse Width Modulation of
approx. 1kHz; LSB in Mode3
must be left unconnected
must be left unconnected
3V-Regulator Output
Positive Supply Voltage 5 V
Mode1 - Quadrature A/B output:
Represents the default quadrature A/B signal mode.
DO_OD
DO
DI_PD
DI_PU
digital output open drain
digital output
digital input pull-down
digital input pull-up
S supply pin
DI digital input
DO_T digital output /tri-state
ST schmitt-trigger input
Mode2 – Single channel output:
Configures Pin 3 to deliver up to 512 pulses (up to 1024
state changes) per revolution. It is equivalent to the state-
change of the LSB (least significant bit) of the absolute
position value. Pin 4 provides the information of the
rotational direction.
Mode3 – Brush-less DC motor commutation mode:
The alternative third mode provides commutation signals for
electrical motors with either one pole pair or two pole pairs.
In this mode Pin 12 provides the LSB output instead of the
PWM (Pulse-Width-Modulation) signal.
Both modes (mode 1 and mode 2) provide an index signal (1
pulse/revolution) with an adjustable width of one LSB or
three LSBs.
Pin 8 (Prog) can be used as digital input to shift serial data
through the device (Daisy Chain Configuration). This pin is
also necessary to program the different interface modes,
the incremental resolution and the zero-position into the
O(SSI) to readout the absolute position data of the magnet.
Revision 1.1
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