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reported through the ALERT pin whenever the monitored output value crosses its associated out-of-range

threshold.

Table 7-1. ALERT Diagnostics Description

INA228 DIAGNOSTIC

STATUS BIT IN DIAG_ALRT REGISTER

(RO)

OUT-OF-RANGE

THRESHOLD

VALUE

Shunt Under Voltage Limit

SHNTUL

SUVL

0x8000 h

(two's complement)

Shunt Over Voltage Limit

SHNTOL

SOVL

0x7FFF h

(two's complement)

Bus Voltage Over-Limit

BUSOL

BOVL

0x7FFF h

(two's complement,

positive values only)

Bus Voltage Under-Limit

BUSUL

BUVL

0x0000 h

(two's complement,

positive values only)

Temperature Over-Limit

TMPOL

TEMP_LIMIT

0xFFFF h

(two's complement,

positive values only)

Power Over-Limit

POL

PWR_LIMIT

0x7FFF h

(two's complement)

A read of the DIAG_ALRT register is used to determine which diagnostic has triggered the ALERT pin. This

ALERT pin functions.

• Alert latch enable — In case the ALERT pin is triggered, this function will hold the value of the pin even after

all diagnostic conditions have cleared. A read of the DIAG_ALRT register will reset the status of the ALERT

pin. This function is enabled by setting the ALATCH bit.

• Conversion ready enable — Enables the ALERT pin to assert when an ADC conversion has completed and

output values are ready to be read through the digital interface. This function is enabled by setting the CNVR

bit. The conversion completed events can also be read through the CNVRF bit regardless of the CNVR bit

setting.

• Alert comparison on averaged output — Allows the out-of-range threshold value to be compared to the

averaged data values produced by the ADC. This helps to additionally remove noise from the output data

when compared to the out-of-range threshold to avoid false alerts due to noise. However, the diagnostic will

be delayed due to the time needed for averaging. This function is enabled by setting the SLOWALERT bit.

• Alert polarity — Allows the device to invert the active state of the ALERT pin. Note that the ALERT pin is an

open-drain output that must be pulled-up by a resistor. The ALERT pin is active-low by default and can be

configured for active high function using the APOL control bit.

Other diagnostic functions that are not reported by the ALERT pin but are available by reading the DIAG_ALRT

• Math overflow — Indicated by the MATHOF bit, reports when an arithmetic operation has caused an internal

• Memory status — Indicated by the MEMSTAT bit, monitors the health of the device non-volatile trim memory.

This bit should always read '1' when the device is operating properly.

• Energy overflow — Indicated by the ENERGYOF bit, reports when the ENERGY register has reached an

overflow state due to data accumulation.

• Charge overflow — Indicated by the CHARGEOF bit, reports when the CHARGE register has reached an

overflow state due to data accumulation.

When the ALERT pin is configured to report the ADC conversion complete event, the ALERT pin becomes a

multipurpose reporting output. Figure 7-6 shows an example where the device reports ADC conversion complete

events while the INA228 device is subject to shunt over voltage (over current) event, bus under voltage event,

over temperature event and over power-limit event.

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INA228

SLYS021 – JANUARY 2021

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