AS5043TR datasheet(7/26 Pages) AMSCO | PROGRAMMABLE 360째 MAGNETIC ANGLE ENCODER WITH ABSOLUTE SSI AND ANALOG OUTPUTS

Part No.	AS5043TR

Description	PROGRAMMABLE 360째 MAGNETIC ANGLE ENCODER WITH ABSOLUTE SSI AND ANALOG OUTPUTS

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Manufacturer	AMSCO [ams AG]

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AS5043 Programmable 360° Magnetic Angle Encoder

Revision 1.4, 04-Apr-06

www.austriamicrosystems.com

Page 7 of 26

11 Analog Output

The analog output Vout provides an analog voltage that is

proportional to the angle of the rotating magnet and

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 14).

The digital range selector allows a preselection of the

angular range for 360°,180°,90° or 45° (see Table 5).

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 Table 3).

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% VDACref. The reference point may be either

taken from VDD5V/2 or from the external DACref input.

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.

b) 10…..90% VDACref. This range allows better linearity,

as the OPAMP is not driven to the rails. Furthermore, this

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.

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 Full Scale Mode

This output mode provides a ratiometric DAC output of (0% to 100%)x Vref *), amplified by the OPAMP stage (default =

internal 2x gain, see Figure 14)

Note: For simplification, Figure 8

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 8).

Figure 8: Analog output, full scale mode (shown for 360°mode)

Vref

0°

90°

180°

270°

360°

0V

analog

output

voltage

angle

100%

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