as5311 austriamicrosystems, as5311 Datasheet - Page 3

• Manufacturer Part Number: as5311
• Description: High Resolution Magnetic Linear Encoder
• Manufacturer: austriamicrosystems

AS5311
Data Sheet
Pin 8 is the supply ground pin. Pins 18 and 19 are the positive supply pins.
For 5V operation, connect the 5V supply to pin 19 and add a 2µ2…10µF buffer capacitor at pin 19.
For 3.3V operation, connect both pins 18 and 19 to the 3.3V supply.
Pin 9 is used for factory programming only. It should be connected to VSS.
Pins 2 and 3 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.
External pull-up resistors are required at these pins. See 5.3.2 for maximum output currents on these pins. Since
they are open-drain outputs they can also be combined (wired-and).
Pin 15 (PWM) allows a single wire output of the 12-bit absolute position value within one pole pair (2.0mm). The
value is encoded into a pulse width modulated signal with 1µs pulse width per step (1µs to 4097µs over one pole
pair).
Pins 6, 10, 11, 16, 17 and 20 are for internal use and must not be connected.
Table 1
DO_OD
DO
DI_PD
DI_PU
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Pin
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
Pin description
digital output open drain
digital output
digital input pull-down
digital input pull-up
MagDECn
MagINCn
Symbol
VDD3V3
VDD5V
Index
PWM
Prog
VSS
CLK
CSn
NC
NC
NC
NC
DO
NC
NC
NC
A
B
DI_PU, ST
DO_OD
DO_OD
DI_PD
DI, ST
Type
DO_T
DO
DO
DO
DO
S
S
S
-
-
-
-
-
-
-
S
DI
DO_T
ST
3V-Regulator output; internally regulated from VDD5V. Connect to
VDD5V for 3V supply voltage. Do not load externally.
Must be left unconnected
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.
Incremental output A
Incremental output B
Must be left unconnected
Incremental output Index.
Negative Supply Voltage (GND)
OTP Programming Input for factory programming. Connect to VSS
Must be left unconnected
Must be left unconnected
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). Must be low to enable incremental outputs
Pulse Width Modulation of approx. 244Hz; 1µs/step
Must be left unconnected
Must be left unconnected
Positive Supply Voltage, 3.0 to 5.5 V
Must be left unconnected
supply pin
digital input
digital output /tri-state
Schmitt-Trigger input
Revision 1.00
Description
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