AS5046-ASST austriamicrosystems, AS5046-ASST Datasheet - Page 23

• Manufacturer Part Number: AS5046-ASST
• Description: IC ENCODER PROG 12-BIT 16-SSOP
• Manufacturer: austriamicrosystems
• Type: Linear, Rotary Encoder - Programmabler

Specifications of AS5046-ASST

• Sensing Range: 45mT ~ 75mT
• Voltage - Supply: 3 V ~ 3.6 V, 4.5 V ~ 5.5 V
• Current - Supply: 21mA
• Current - Output (max): 4mA
• Output Type: Analog, Ratiometric
• Features: Programmable
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 16-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AS5046-ASSTTR

AS5046
Data Sheet
Note that the parallel connection has some restrictions:
14 Ratiometric Analog Angle Output
The analog output V
ratiometric to the supply voltage VDD5V (max.5.5V). It can source or sink currents up to ±1mA in normal operation
(up to 66mA short circuit current).
The analog output block consists of a digital angular range selector, a 10-bit Digital-to-Analog converter and an
OPAMP buffer stage (see Figure 17).
The digital range selector allows a preselection of the angular range for 360°, 180°, 90° or 45° (see Table 23). Fine-
tuning of the angular range can be accomplished by adjusting the gain of the OPAMP buffer stage.
The reference voltage for the Digital-to-Analog converter (DAC) can be taken internally from VDD5V / 2. In this mode,
the output voltage is ratiometric to the supply voltage.
Alternatively, an external DAC reference can be applied at pin DACref (#9). In this mode, the analog output is
ratiometric to the external reference voltage.
An on-chip diagnostic feature turns the analog output off in case of an error (broken supply or magnetic field out of
range; see Figure 17). 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:
14.1 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.
14.1.1 Full Scale Mode
This output mode provides a ratiometric DAC output of (0% to 100%)x Vref
= internal 2x gain, see Figure 17)
www.austriamicrosystems.com
a) 0……100% V
b) 10…..90% V
•
•
•
The 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.
mode 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.
Each unit must be programmed to have a different address (ranging from 000 to 111; see Table 14)
Changing the address also changes the analog mode, as these OTP bits share the same position.(see
Figure 13)
Only the SIU containing angle data and status bits can be read from parallel devices (type ID 0101). The
other registers all share the same type identifier (0001, 1011, 0111; see Table 14), which would lead to data
collision when trying to read any of these registers from parallel devices.
DACref
DACref
out
. This range allows better linearity, as the OPAMP is not driven to the rails. Furthermore, this
. The reference point may be either taken from VDD5V/2 or from the external DACref input.
provides an analog voltage that is proportional to the angle of the rotating magnet and
Revision 1.12
*)
, amplified by the OPAMP stage (default
23 – 42