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AS5040ASST(2006) Просмотр технического описания (PDF) - austriamicrosystems AG

Номер в каталоге
Компоненты Описание
производитель
AS5040ASST
(Rev.:2006)
AmsAG
austriamicrosystems AG AmsAG
AS5040ASST Datasheet PDF : 28 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
AS5040 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
2 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
2.1 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
Pin 3 Pin 4
Pin 6 Pin 12
1.x: quadrature A
B
Index PWM
2.x:step/direction LSB Direction Index PWM
3.x: commutation U
V
W
LSB
Table 1: Pin assignment for the different incremental output modes
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.
Pin Symbol Type Description
Magnet Field Magnitude INCrease;
1
MagINCn
DO_OD
active low, indicates a distance
reduction between the magnet and the
device surface.
Magnet Field Magnitude DECrease;
2
MagDECn DO_OD active low, indicates a distance increase
between the device and the magnet.
3
A_LSB_U
DO
Mode1.x: Quadrature A channel
Mode2.x: Least Significant Bit
Mode3.x: U signal (phase1)
Mode1.x: Quadrature B channel
4
B_Dir_V
DO
quarter period shift to channel A.
Mode2.x: Direction of Rotation
Mode3.x: V signal (phase2)
5
NC
-
Must be left unconnected
6
Index_ W
DO
Mode1.x and Mode2.x : Index signal
indicates the absolute zero position
Mode3.x: W signal (phase3)
7
VSS
S
Negative Supply Voltage (GND)
8
Prog
DI_PD
OTP Programming Input and Data Input
for Daisy Chain mode. Internal pull-
down resistor (~74kΩ).
May be connected to VSS if
programming is not used
9
DO
DO_T
Data Output of
Synchronous Serial Interface
10 CLK
DI,
ST
Clock Input of
Synchronous Serial Interface; Schmitt-
Trigger input
11 CSn
DI_PU,
ST
Chip Select, active low; Schmitt-Trigger
input, internal pull-up resistor (~50kΩ)
connect to VSS in incremental mode
(see 5.2.1)
12 PWM_LSB DO
Pulse Width Modulation of approx.
1kHz; LSB in Mode3.x
13 NC
-
Must be left unconnected
14 NC
-
Must be left unconnected
15 VDD3V3
S
3V-Regulator Output (see Figure 18)
16 VDD5V
S
Positive Supply Voltage 5 V
Table 2: Pin description SSOP16
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
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.
Revision 1.6, 03-Oct-06
www.austriamicrosystems.com
Page 2 of 28

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