as5045 austriamicrosystems, as5045 Datasheet - Page 2

• Manufacturer Part Number: as5045
• Description: 12-bit Programmable Magnetic Rotary Encoder
• Manufacturer: austriamicrosystems

AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
2
2.1
Table 1 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 3, 4, 5, 6, 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.
Pin 6 Mode allows switching between filtered (slow) and
unfiltered (fast mode). See section 4.
Revision 1.2, 03-Oct-06
Pin
1
2
3
4
5
6
7
8
9
10
MagDECn
MagINCn
Prog_DI
Pin Configuration
Mode
Symbol
MagINCn
MagDECn
NC
NC
NC
Mode
VSS
Prog_DI
DO
CLK
VSS
NC
NC
Pin Description
NC
and
Figure 2: Pin configuration SSOP16
MagDECn
1
2
3
4
5
6
7
8
Type
DO_OD
DO_OD
-
-
-
-
S
DI_PD
DO_T
DI,
ST
(magnetic
Description
Magnet Field Magnitude INCrease;
active low, indicates a distance
reduction between the magnet and
the device surface. See Table 5
Magnet Field Magnitude DECrease;
active low, indicates a distance
increase between the device and the
magnet. See Table 5
Must be left unconnected
Must be left unconnected
Must be left unconnected
Select between slow (open, low:
VSS) and fast (high) mode. Internal
pull-down resistor.
Negative Supply Voltage (GND)
OTP Programming Input and Data
Input for Daisy Chain mode. Internal
pull-down resistor (~74kΩ).
Connect to VSS if not used
Data Output of
Synchronous Serial Interface
Clock Input of
Synchronous Serial Interface;
Schmitt-Trigger input
16
15
14
13
12
10
11
9
field
VDD5V
VDD3V3
NC
NC
PWM
CSn
CLK
DO
www.austriamicrosystems.com
strength
DO_OD
DO
DI_PD
DI_PU
Pin 8 (Prog) is used to program the zero-position into the
OTP (see chapter 7.1).
This pin is also used as digital input to shift serial data
through the device in Daisy Chain configuration,
(see page 6).
Pin 11 Chip Select (CSn; active low) selects a device
within a network of AS5045 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 (Figure 13) and
programming mode (Figure 9).
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
4096µs over a full turn). By using an external low pass
filter, the digital PWM signal is converted into an analog
voltage, making a direct replacement of potentiometers
possible.
3
The AS5045 is manufactured in a CMOS standard
process and uses a spinning current Hall technology for
sensing the magnetic field distribution across the surface
of the chip.
The integrated Hall elements are placed around the
center of the device and deliver a voltage representation
of the magnetic field at the surface of the IC.
Through Sigma-Delta Analog / Digital Conversion and
Digital Signal-Processing (DSP) algorithms, the AS5045
provides
position information. For this purpose a Coordinate
Pin
11
12
13
14
15
16
Functional Description
Symbol
CSn
PWM
NC
NC
VDD3V3
VDD5V
digital output open drain
digital output
digital input pull-down
digital input pull-up
accurate
Table 1: Pin description SSOP16
Type
DI_PU,
ST
DO
-
-
S
S
high-resolution
3V-Regulator Output, internally
regulated from VDD5V. Connect to
VDD5V for 3V supply voltage. Do not
load externally.
Description
Chip Select, active low; Schmitt-
Trigger input, internal pull-up resistor
(~50kΩ)
Pulse Width Modulation of approx.
244Hz; 1µs/step
(opt. 122Hz; 2µs/step)
Must be left unconnected
Must be left unconnected
Positive Supply Voltage, 3.0 to 5.5 V
S
DI
DO_T digital output /tri-state
ST
supply pin
digital input
Schmitt-Trigger input
absolute
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