AS5046 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
Demoboard Operation Manual
Revision 1.1, 3-Jun-08 www.austriamicrosystems.com
Page 16 of 21
4
Pin Description
Pin Symbol
Type
Description
1
MagRngn DO_OD
Magnet Field Magnitude RaNGe
warning; active low, indicates that
the magnetic field strength is outside
of the recommended limits.
2 Mode
DI_PD,
ST
Mode input. Select between low
noise (open, low) and high speed
(high) mode. Internal pull-down
resistor
3 CSn
DI_PU,
ST
Chip Select, active low; Schmitt-
Trigger input, internal pull-up resistor
(~50k
Ω
). Must be connected to VSS
for I²C data transmission.
4 SCL DI,ST
Serial Clock Line. Clock input for I²C
data transmission
5
NC
-
Must be left unconnected
6 SDA DIO
Serial Data Line. Bi-directional I/O
for I²C data transmission
7
VSS
S
Negative Supply Voltage (GND)
8 Prog DI_PD
OTP Programming Input. Internal
pull-down resistor (~74k
Ω
). Should
be connected to VSS if programming
is not used
9 DACref AI
DAC Reference voltage input for
external reference
10 DACout AO DAC output (unbuffered, Ri ~8k
Ω
)
11 FB
AI
Feedback, OPAMP inverting input
12 Vout AO OPAMP
output
13
NC
-
Must be left unconnected
14
NC
-
Must be left unconnected
15 VDD3V3 S
3V-Regulator Output for internal
core, regulated from VDD5V.
Connect to VDD5V for 3V supply
voltage. Do not load externally.
16
VDD5V
S
Positive Supply Voltage, 3.0 to 5.5 V
Figure 13: AS5046 pin-out and alignment tolerances
DO_OD digital output open drain
S supply
pin
DO digital
output
DI digital
input
DI_PD digital input pull-down
DO_T digital
output
/tri-state
DI_PU digital input pull-up
ST Schmitt-Trigger
input
MagRngn
Prog
VSS
SDA
NC
SCL
CSn
VDD5V
DACref
DACout
FB
Vout
NC
NC
1
4
3
2
13
12
11
10
9
8
7
6
5
16
15
14
Mode
VDD3V3
Figure 14: AS5046 pin assignment
1
Defined
center
2.433 mm
2.433 mm
3.9 mm
3.9 mm
Area of allowed magnet
misalignment: 0.5mm diameter
Circle of Hall elements
on chip: 2.2mm diameter
Figure 15: Magnet alignment tolerances
4.1
Pin-Out and Magnet Misalignment
Shown above is the pin assignment and description for the AS5046. The Hall Sensors are arranged as a concentric circle at
the center of the IC with a diameter of 2.2mm (87mil). The recommended magnetic field strength at this concentric circle is
45…75mT (see datasheet).
Ideally, the center of the magnet should be located right above the center of the IC (see graph). The more the magnet is off-
center, the higher will be the non-linearity (deviation of actual position to indicated position). Consequently, the accuracy of
the system depends on the misalignment of the magnet. For best performance, the magnet should be centered within a
circle of 0.5mm diameter at the center of the chip.
