AS5046ASSU austriamicrosystems, AS5046ASSU Datasheet - Page 18

• Manufacturer Part Number: AS5046ASSU
• Description: IC, MAGNETIC ROTARY ENCODER 12BIT SSOP16
• Manufacturer: austriamicrosystems
• Type: Magnetic Rotary Encoderr

Specifications of AS5046ASSU

• Ic Function: Encoder IC
• Supply Voltage Range: 3V To 3.6V, 4.5V To 5.5V
• Operating Temperature Range: -40°C To +125°C
• Digital Ic Case Style: SSOP
• No. Of Pins: 16
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AS5046 Programmable 360° Magnetic Angle Encoder – Preliminary Data Sheet
An on-chip diagnostic feature turns the analog output off in case of an error (broken supply or magnetic field out of range;
see Table 7).The DAC output can be accessed directly at pin #10 DACout.
The addition of an OPAMP to the DAC output allows a variety of user configurable options, such as variable output voltage
ranges and variable output voltage versus angle response. By adding an external transistor, the analog voltage output can
be buffered to allow output currents up to hundred milliamperes or more.
Furthermore, the OPAMP can be configured as constant current source.
As an OTP option, the DAC can be configured to 2 different output ranges:
a) 0……100% V
0…100% range allows easy replacement of potentiometers. Due to the nature of rail-to-rail outputs, the linearity will degrade
at output voltages that are close to the supply rails.
b) 10…..90% V
allows failure detection, when the analog output voltage is outside of the normal operating range of 10…90%VDD, as in the
case of broken supply or when the magnetic field is out of range and the analog output is turned off.
11.1 Analog Output Voltage Modes
The Analog output voltage modes are programmable by OTP. Depending on the application, the analog output can be
selected as rail-to-rail output or as clamped output with 10%-90% VDD5V.
The output is ratiometric to the supply voltage (VDD5V), which can range from 3.0V to 5.5V. If the DAC reference is
switched to an external reference (pin DACref), the output is ratiometric to the external reference.
11.1.1
This output mode provides a ratiometric DAC output of (0% to 100%)x Vref
internal 2x gain, see Figure 17)
Note: Figure 11 and are shown for 360° operation. See Table 9 (page 24) for further angular range programming options.
11.1.2
Revision 1.1
analog
output
voltage
100%
analog
output
voltage
Vref
0V
100%
10%
0%
90%
Vref
Full Scale Mode
Diagnostic Output Mode
0°
0°
DACref
DACref
. This range allows better linearity, as the OPAMP is not driven to the rails. Furthermore, this mode
. The reference point may be either taken from VDD5V/2 or from the external DACref input. The
90°
90°
Figure 11: Analog output, full scale mode (shown for 360°mode)
180°
180°
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Figure 12: Diagnostic Output Mode
In an error case, the output
voltage is in the grey area
270°
270°
360°
360°
normal
operating
area
angle
angle
*)
, amplified by the OPAMP stage (default =
In Diagnostic Output Mode (see Figure
12) the analog output of the internal
DAC ranges from 10% - 90% Vref
error case, either when the supply is
interrupted or when the magnetic field is
in the “red” range, (see Table 7) the
output is switched to 0V and thus
indicates the error condition.
Note: For simplification, Figure 11
describes a linear output voltage from
rail to rail (0V to VDD). In practice, this
is not feasible due to saturation effects
of the OPAMP output driver transistors.
The actual curve will be rounded
towards the supply rails (as indicated in
Figure 11).
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*)
. In an