as5043 austriamicrosystems, as5043 Datasheet - Page 9

• 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 Programming the AS5043
After power-on, programming the AS5043 is enabled with
the rising edge of CSn and Prog = logic high. 16 bit
configuration data must be serially shifted into the OTP
register via the Prog-pin. The first “CCW” bit is followed
by the zero position data (MSB first) and the Analog
Output Mode setting as shown in Table 5. Data must be
valid at the rising edge of CLK (see Figure 10). Following
this sequence, the voltage at pin Prog must be raised to
the programming voltage V
pulses (t
exit the programming mode, the chip must be reset by a
power-on-reset. The programmed data is available after
the next power-up.
Note: During the programming process, the transitions in
the programming current may cause high voltage spikes
generated by the inductance of the connection cable. To
avoid these spikes and possible damage to the IC, the
connection wires, especially the signals PROG and VSS
must be kept as short as possible. The maximum wire
length between the V
PROG (Figure 12) should not exceed 50mm (2 inches).
To suppress eventual voltage spikes, a 10nF ceramic
capacitor should be connected close to pins PROG and
VSS. This capacitor is only required for programming, it
Revision 1.6, 3-Oct-06
PROG
) must be applied to program the fuses. To
PROG
PROG
switching transistor and pin
Figure 10: Programming Access – OTP Write Cycle (section of Figure 11)
(see Figure 11). 16 CLK
Figure 11: Complete OTP programming sequence
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is not required for normal operation. The clock timing t
must be selected at a proper rate to ensure that the
signal PROG is stable at the rising edge of CLK (see
Figure 10). Additionally, the programming supply voltage
should be buffered with a 10µF capacitor mounted close
to the switching transistor. This capacitor aids in
providing peak currents during programming. The
specified programming voltage at pin PROG is 7.3 – 7.5V
(see section 19.7). To compensate for the voltage drop
across the V
programming voltage may be set slightly higher (7.5 -
8.0V, see Figure 12).
OTP Register Contents:
CCW
Z [9:0]: Programmable Zero / Index Position
FB_intEN: OPAMP gain setting: 0=external, 1=internal
RefExtEN:
ClampMd EN:
Output Range (OR0, OR1):
ccw=0 – angular value increases with clockwise rotation
ccw=1 – angular value increases with counterclockwise rotation
Counter Clockwise Bit
[1:0]
DAC reference: 0=internal, 1=external
PROG
Analog output span: 0=0-100%,
1=10-90%*VDD
Analog Output Range Selection
00 = 360°
10 = 90°
switching transistor, the applied
01 = 180°
11 = 45°
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