AS5043

Data Sheet – Failure Diagnostics

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17 Failure Diagnostics

The AS5043 also offers several diagnostic and failure detection features:

17.1 Magnetic Field Strength Diagnosis

By software:

the MagInc and MagDec status bits will both be high when the magnetic field is out of range.

By hardware:

Pin #1 (MagRngn) is a logical NAND-ed combination of the MagInc and MagDec status bits. It is an open-

drain output and will be turned on (= low with external pull-up resistor) when the magnetic field is out of range.

By hardware:

Pin #12 (Vout) is the analog output of the DAC and OP-Amp. The analog output will be 0V, when the

magnetic field is out of range (all analog modes).

17.2 Power Supply Failure Detection

By software:

If the power supply to the AS5043 is interrupted, the digital data read by the SSI will be all “0”s. Data is only

valid, when bit OCF is high, hence a data stream with all “0”s is invalid. To ensure adequate low levels in the failure case,

a pull-down resistor (~10k

Ω) should be added between pin DO and VSS at the receiving side

By hardware:

The MagRngn pin is an open drain output and requires an external pull-up resistor. In normal operation,

this pin is high ohmic and the output is high. In a failure case, either when the magnetic field is out of range or the power

supply is missing, this output will become low. To ensure an adequate low level in case of a broken power supply to the

AS5043, the pull-up resistor (~10k

Ω) must be connected to the positive supply at pin 16 (VDD5V).

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