as5043 austriamicrosystems, as5043 Datasheet - Page 11

• Manufacturer Part Number: as5043
• Description: 10-bit Programmable 360? Magnetic Angle Encoder With Absolute Digital And Analog Outputs
• Manufacturer: austriamicrosystems

AS5043 Programmable 360° Magnetic Angle Encoder
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).
Revision 1.6, 3-Oct-06
DSP
from
Magnetic field range alarm. Active
low. Leave open or connect to
VSS if not used
AS5043
Digital serial
interface, 10bit/360°.
Leave open if not
used. CSn and CLK
may also be tied to
VSS if not used
CSn
OR1
3
CLK
0 360° 0
0 180° 1
1 90° 0
1 45° 1
Selector
Range
OR0
4
DO
MagRngn
6
1
PROG
digital
10bit
8
for OTP
programming and
alignment mode
only. Leave open
or connect to VSS
if not used
0= 0-100% * Vref (def.)
1= 10-90% * Vref
ClampMdEN
DAC
Mode pin.
Default = open
(low noise)
Vref
Mode
2
0 - 100% VDD5V /2
NC
REF_extEN
5
Figure 14: analog output block diagram
Test pins.
Leave open
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External DAC reference pin.
Leave open or connect to
VSS if not used
0=int
1=ext
NC
13
DACref
NC
14
9
analog
VDD5V / 2
10bit
VDD
FB_intEN
VDD5V
Vout
Gain = 2x (int)
0
+
-
16
0=ext
LDO
3.3V
1=int
VSS
VDD3V3
DACout
7
Rf_int
30k
Rg_int
30k
VOUT
FB
OP-Amp feedback pin.
Leave open if not used.
DAC output pin.
Leave open if not used
15
10
12
11
Rf
+
Connect pins 15 and
16 for VDD= 3.0-3.6V.
Do NOT connect for
VDD = 4.5-5.5V !
1-10µF
Rg
360°angle
RLmin
= 4k7
2
Vout
Page 11 of 26
1
C
<100pF
3
L
VDD
VSS