AS5043 Programmable 360° Magnetic Angle Encoder

Revision 1.4, 04-Apr-06

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Page 11 of 26

12.2 Analog Mode Programming

The analog output can be configured in many ways:

It consists of three major building blocks,

a digital range preselector,

a 10-bit Digital-to-Analog-Converter (DAC)

and an OP-AMP buffer stage.

In the default configuration (all OTP bits = 0), the analog output is set for 360° operation, internal DAC reference

(VDD5V/2), external OPAMP gain, 0-100% ratiometric to VDD5V.

Shown below is a typical example for a 0°-360° range, 0-5V output. The complete application requires only one external

component, a buffer capacitor at VDD3V3 and has only 3 connections VDD, VSS and Vout (connectors 1-3).

Note: the default setting for the OPAMP feedback path is:FB_intEn=0=external. The external resistors Rf and Rg must be

installed. In the programmed state (FB_intEn=1=internal), these resistors do not need to be installed as the feedback path is

internal (Rf_int and Rg_int).

AS5043

Range

Selector

OR1

OR0

ClampMdEN

0 360° 0

0 180° 1

1 90° 0

1 45° 1

10bit

digital

REF_extEN

0=int

DACref

VDD5V

+

-

0 - 100% VDD5V /2

LDO

3.3V

VDD3V3

916

15

DACout

10

VOUT

12

Rf_int

30k

Rg_int

30k

10bit

analog

FB

11

FB_intEN

1=int

Gain = 2x (int)

<100pF

360°angle

0

Vout

VDD

DAC

1=ext

0=ext

0= 0-100% * Vref (def.)

1= 10-90% * Vref

VDD5V / 2

Vref

VDD

VSS

1-10µF

7

PROG

DO

CLK

CSn

for OTP

programming and

alignment mode

only. Leave open

or connect to VSS

if not used

Digital serial

interface, 10bit/360°.

Leave open if not

used. CSn and CLK

may also be tied to

VSS if not used

34

6

8

MagRngn

Mode

Magnetic field range alarm. Active

low. Leave open or connect to

VSS if not used

Mode pin.

Default = open

(low noise)

OP-Amp feedback pin.

Leave open if not used.

DAC output pin.

Leave open if not used

External DAC reference pin.

Leave open or connect to

VSS if not used

NC

13

Test pins.

Leave open

NC

5

NC

14

2

1

Connect pins 15 and

16 for VDD= 3.0-3.6V.

Do NOT connect for

VDD = 4.5-5.5V !

from

DSP

1

2

3

RLmin

= 4k7

Vout

VSS

Rf

Rg

Figure 14: analog output block diagram