7.3.5 Diagnostic Output

As shown in Figure 7-3, the open-drain DIAG pin can be monitored to confirm the device is operational and

the output voltage is valid. During power-up, the DIAG pin is actively held low until the high-side supply is in

regulation and the device operates properly. During normal operation, the DIAG pin is in high-impedance (Hi-Z)

state and is pulled high through an external pullup resistor. The DIAG pin is actively pulled low if:

• The low-side does not receive data from the high-side (for example, because of a loss of power on the high

• The high-side DC/DC output voltage (DCDC_OUT) or the high-side LDO output voltage (HLDO_OUT) drop

below their respective undervoltage detection thresholds (brown-out). In this case, the low-side may still

value, see Figure 7-2.

High-side supply undervoltage

DIAG

Power-up

Normal

Operation

Normal

Operation

Figure 7-3. DIAG Output Under Different Operating Conditions

During normal operation, the DIAG pin is in a high-impedance state. Connect the DIAG pin to a pullup resistor or

leave open if not used.

7.4 Device Functional Modes

The AMC3302-Q1 is operational when the power supply VDD is applied, as specified in the Recommended

Operating Conditions table.

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AMC3302-Q1

SBASA84A – FEBRUARY 2021 – REVISED JULY 2021

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