AS5046 Programmable 360° Magnetic Angle Encoder – Preliminary Data Sheet

Revision 1.1

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where:

= noise level at pin Vout in Vrms

TN

= transition noise (in °rms; see 5.5)

VDD5V

= Supply voltage VDD5V in V

= noise level of OPAMP

(paragraph 0) in Vrms

12.7 Application Examples

Application Note AN5043-10 shows various application

examples for the AS5043 encoder IC. The same

application examples apply for the analog output of the

AS5046.

13 Analog Readback Mode

Non-volatile programming (OTP) uses on-chip zener diodes, which become permanently low resistive when subjected to a

specified reverse current.

The quality of the programming process depends on the amount of current that is applied during the programming process

(up to 130mA). This current must be provided by an external voltage source. If this voltage source cannot provide adequate

power, the zener diodes may not be programmed properly.

In order to verify the quality of the programmed bits, an analog level can be read for each zener diode, giving an indication

whether this particular bit was properly programmed or not.

To put the AS5046 in Analog Readback Mode, a digital sequence must be applied to pins CSn, PROG and CLK as shown in

Figure 18. The digital level for this pin depends on the supply configuration (3.3V or 5V; see section 7, page 9).

The second rising edge on CSn (OutpEN) changes pin PROG to a digital output and the log. high signal at pin PROG must

be removed to avoid collision of outputs (grey area in Figure 18).

saved as a reference for the calculation of the subsequent programmed and unprogrammed OTP bits.

Following this step, each rising slope of CLK outputs one bit of data in the reverse order as during programming.

(see Figure 18: Output Range OR0 and -1 , ClampMdEn, RefExtEn, FB_IntEn, Z0…Z9, ccw)

During analog readback, the capacitor at pin PROG (see Figure 15) should be removed to allow a fast readout rate.

gives an indication on the quality of the programmed bit: a reading of <100mV indicates a properly programmed bit and a

reading of >1V indicates a properly unprogrammed bit.

A reading between 100mV and 1V indicates a faulty bit, which may result in an undefined digital value, when the OTP is

read at power-up.

Figure 18: Analog OTP Register Read