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AS5043ASST Datasheet(PDF) 12 Page - ams AG

Part # AS5043ASST
Description  Programmable 360 Magnetic Angle Encoder with Absolute SSI and Analog Outputs
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS5043ASST Datasheet(HTML) 12 Page - ams AG

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AS5043
Data Sheet – Programming the AS5043
www.austriamicrosystems.com
Revision 1.80
12 – 36
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
VPROG (see Figure 10). 16 CLK pulses (tPROG) must be applied to program the fuses. To 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 VPROG switching transistor and pin PROG (see 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 is not required for normal operation. The clock timing tclk 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 VPROG switching transistor, the applied
programming voltage may be set slightly higher (7.5 - 8.0V, see Figure 12).
OTP Register Contents:
CCW
Counter Clockwise Bit
ccw=0 – angular value increases with clockwise rotation
ccw=1 – angular value increases with counterclockwise rotation
Z [9:0]:
Programmable Zero / Index Position
FB_intEN:
OPAMP gain setting: 0=external, 1=internal
RefExtEN:
DAC reference: 0=internal, 1=external
ClampMd EN:
Analog output span: 0=0-100%,
1=10-90%*VDD
Output Range (OR0, OR1):
Analog Output Range Selection
[1:0]
00 = 360°
01 = 180°
10 = 90°
11 = 45°
Figure 10: Programming Access – OTP Write Cycle (section of)
CCW
Z9
Z8
Z7
Z6
Z5
Z4
Z3
Z2
Z1
Z0
FB_int
EN
RefExt
EN
Clamp
Md En
Output
Range1
Analog Modes
Zero Position
tDatain valid
tProg enable
CSn
Prog
Output
Range0
1
16
8
CLKPROG
tDatain
tclk
see text


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