EVAL-ADFS5758SDZ datasheet(44/75 Pages) AD

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ADFS5758

Data Sheet

Rev. 0 | Page 44 of 75

Table 18. FAULT Pin Trigger Sources

Fault Type

Mapped to

FAULT Pin

Mask

Ability

Digital Diagnostic Faults

Oscillator Stop Detect

Yes

Calibration Memory Not Refreshed

N/A1

Reset Detected

N/A1

3-Wire Interface Error

Yes

WDT Late Error

Yes

WDT Early Error

Yes

Background CRC Error

Yes

DAC Latch Monitor Error

Yes

Dual Calculation Error

Yes

Inverse DAC Check Error

Yes

Calibration Memory CRC Error

Yes

Invalid SPI Access

Yes

Write Attempted on Locked

Configuration Register Space

Yes

SCLK Count Error

Yes

No2

Slip Bit Error

Yes

SPI CRC Error

Yes

Analog Diagnostic Faults

VIOUT Overvoltage Error

Yes

DC-to-DC Short Circuit Error

Yes

DC-to-DC Power Error

Yes

VLDO Capacitor Detection

N/A1

Current Output Open Circuit Error

Yes

Voltage Output Short-Circuit Error

Yes

DC-to-DC Die Temperature Error

Yes

Main Die Temperature Error

Yes

REFOUT Comparator Error

Yes

REFIN Comparator Error

Yes

INT_AVCC Comparator Error

Yes

VLDO Comparator Error

Yes

N/A means not applicable.

Although the SCLK count error cannot be masked in the FAULT_PIN_CONFIG

QUIET_EN bit (Bit 3 in the GP_CONFIG1 register).

The DIG_DIAG_STATUS, ANA_DIAG_STATUS, and WDT_

STATUS bits of the status register are used in conjunction with

the FAULT pin and the FAULT_PIN_STATUS bit to inform

the user which one of the fault conditions caused the FAULT

pin or FAULT_PIN_STATUS bit to be activated.

ADC MONITORING

The ADFS5758 incorporates a 12-bit ADC to provide diagnostic

information on user-selectable inputs such as supplies, grounds,

internal die temperatures, references, and external signals (via

the ADC1 pin). A full list of the selectable inputs are available

in Table 19. The reference used for the ADC is derived from

REFOUT. This provides a means of having independence from

the DAC reference (REFIN) if necessary. The ADC_CONFIG

initiated individual conversions or sequence mode) as well as

selection of the multiplexed ADC input channel via the

ADC_IP_SELECT bits (see Table 43).

ADC Transfer Function Equations

The ADC has an input range of 0 V to 2.5 V and can be used to

digitize a variety of different nodes. The set of inputs to the

ADC encompasses both unipolar and bipolar ranges, varying

from high to low voltage values. Therefore, to be able to digitize

them, the voltage ranges outside of the 0 V to 2.5 V ADC input

range must be divided down. The ADC transfer function

equation is dependent on the selected ADC input node (see

Table 19

for a summary of all transfer function equations).

ADC1 Pin Input

Figure 85 shows the ADC1 pin can be used to monitor the IOUT

return current from the output load. If a 20 Ω external sense

resistor is used, an IOUT programmed current of 24 mA becomes

480 mV across RSENSE.

ADFS5758

VIOUT

AGND

RSENSE

RLOAD

ADC1

I OUT

Figure 85. IOUT Monitoring via ADC1 Pin

Summary of ADC Input Nodes

Table 19

is a summary of all possible nodes that can be digitized

by the ADC and the corresponding transfer function equations.

Recommended RSENSE

Analog Devices recommends a low drift, high accuracy resistor.

The RSENSE performance depends on the absolute value and

temperature coefficient of the resistor used. The resistor

specifications, therefore, directly affect the overall ADC

error budget.

EVAL-ADFS5758SDZ Datasheet(PDF) 44 Page - Analog Devices

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