AS5045-ASST datasheet(22/47 Pages) AMSCO

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AS5045 − Detailed Description

The benefits of AS5045 are as follows:

• Complete system-on-chip

• Flexible system solution provides absolute and PWM

outputs simultaneously

• Ideal for applications in harsh environments due to

contactless position sensing

• No calibration required

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 23).

After writing the data into the OTP register it can be

permanently programmed by rising the Prog pin to the

programming voltage VPROG. 16 CLK pulses (tPROG) must be

applied to program the fuses (see Figure 24). 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(s): 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 should not exceed 50mm (2

inches). To suppress eventual 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 tclk must be

selected at a proper rate to ensure that the signal Prog is stable

at the rising edge of CLK (see Figure 23). 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.

Refer to programming conditions in Figure 10.

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 25).

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