as5140 austriamicrosystems, as5140 Datasheet - Page 2

• Manufacturer Part Number: as5140
• Description: 10-bit 360? Programmable Magnetic Rotary Encoder For High Ambient Temperatures Up To 150?c
• Manufacturer: austriamicrosystems

AS5140H 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
2
2.1
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
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:
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.
Revision 1.1, 02-03-2007
Output Mode
1.x: quadrature
2.x:step/direction
3.x: commutation
Pin Configuration
MagDECn
A_LSB_U
MagINCn
Index_W
Pin Description
B_Dir_V
Prog
VSS
and
NC
Figure 2: Pin configuration SSOP16
MagDECn
1
3
4
6
2
5
7
8
Pin 3
A
LSB
U
(magnetic
Pin 4
B
Direction
V
16
15
14
13
12
10
11
9
VDD5V
VDD3V3
NC
NC
PWM_LSB
CSn
CLK
DO
field
Pin 6
Index
Index
W
strength
Pin 12
PWM
PWM
LSB
www.austriamicrosystems.com
Table 2: Pin description SSOP16
DO_OD
DO
DI_PD
DI_PU
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 AS5140H 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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Symbol
MagINCn
MagDECn
A_LSB_U
B_Dir_V
NC
Index_ W
VSS
Prog
DO
CLK
CSn
PWM_LSB
NC
NC
VDD3V3
VDD5V
digital output open drain
digital output
digital input pull-down
digital input pull-up
Type
DO_OD
DO_OD
DO
DO
-
DO
S
DI_PD
DO_T
DI,
ST
DI_PU,
ST
DO
-
-
S
S
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.
Mode1.x: Quadrature A channel
Mode2.x: Least Significant Bit
Mode3.x: U signal (phase1)
Mode1.x: Quadrature B channel
quarter period shift to channel A.
Mode2.x: Direction of Rotation
Mode3.x: V signal (phase2)
Must be left unconnected
Mode1.x and Mode2.x : Index signal
indicates the absolute zero position
Mode3.x: W signal (phase3)
Negative Supply Voltage (GND)
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
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)
connect to VSS in incremental mode
(see 5.2.1)
Pulse Width Modulation of approx.
1kHz; LSB in Mode3.x
Must be left unconnected
Must be left unconnected
3V-Regulator Output (see Figure 16)
Positive Supply Voltage 5 V
S
DI
DO_T digital output /tri-state
ST
supply pin
digital input
Schmitt-Trigger input
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