AS5045 AB austriamicrosystems, AS5045 AB Datasheet - Page 18

• Manufacturer Part Number: AS5045 AB
• Description: BOARD ADAPTER AS5045
• Manufacturer: austriamicrosystems

Specifications of AS5045 AB

• Sensor Type: Magnetic, Rotary Position
• Sensing Range: 360°
• Interface: Serial
• Voltage - Supply: 9V
• Embedded: No
• Utilized Ic / Part: AS5045
• Lead Free Status / RoHS Status: Lead free by exemption / RoHS compliant by exemption
• Sensitivity: -

AS5045
Data Sheet
11 Programming the AS5045
After power-on, programming the AS5045 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 Mode setting bits. Data must be valid at the rising edge of CLK (see
Figure 10).
After writing the data into the OTP register it can be permanently programmed by rising the Prog pin to the
programming voltage V
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
voltage spikes, a 10nF ceramic capacitor should be connected close to pins VPROG and VSS. This capacitor is only
required for programming, it is not required for normal operation. The clock timing t
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 6.8).
To compensate for the voltage drop across the V
set slightly higher (7.5 ~ 8.0V, see Figure 12).
OTP Register Contents:
CCW
Z [11:0]:
PWM dis:
MagCompEn: When set, activates LIN alarm both when magnetic field is too high and too low (see Table 5)
PWMhalfEn:
11.1 Zero Position Programming
Zero position programming is an OTP option that simplifies assembly of a system, as the magnet does not need to
be manually adjusted to the mechanical zero position. Once the assembly is completed, the mechanical and
electrical zero positions can be matched by software. Any position within a full turn can be defined as the permanent
new zero position.
For zero position programming, the magnet is turned to the mechanical zero position (e.g. the “off”-position of a
rotary switch) and the actual angular value is read.
This value is written into the OTP register bits Z11:Z0 (see Figure 10) and programmed (see Figure 11).
Note: The zero position value may also be modified before programming, e.g. to program an electrical zero position
that is 180° (half turn) from the mechanical zero position, just add 2048 to the value read at the mechanical zero
position and program the new value into the OTP register.
11.2 Repeated OTP Programming
Although a single AS5045 OTP register bit can be programmed only once (from 0 to 1), it is possible to program
other, unprogrammed bits in subsequent programming cycles. However, a bit that has already been programmed
should not be programmed twice. Therefore it is recommended that bits that are already programmed are set to “0”
during a programming cycle.
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PROG
Counter Clockwise Bit
Programmable Zero Position
Disable PWM output
When set, PWM frequency is 122Hz or 2µs / step (when PWMhalfEN = 0, PWM frequency is 244Hz,
1µs / step)
ccw=0 – angular value increases in clockwise direction
ccw=1 – angular value increases in counter clockwise direction
switching transistor and pin Prog should not exceed 50mm (2 inches). To suppress eventual
PROG
. 16 CLK pulses (t
PROG
PROG
Revision 1.7
) must be applied to program the fuses (Figure 11). To exit the
switching transistor, the applied programming voltage may be
clk
must be selected at a proper
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