INA745AIRELR datasheet(19/50 Pages) TI2

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6.3.7 Multi-Alert Monitoring and Fault Detection

The INA745x includes a multipurpose, open-drain ALERT output pin that can be used to report multiple

diagnostics, or to indicate that the ADC conversion is complete. The diagnostics listed in Table 6-1 are constantly

monitored and can be reported through the ALERT pin whenever the monitored output value crosses the

associated out-of-range threshold.

Table 6-1. ALERT Diagnostics Description

INA745x DIAGNOSTIC

STATUS BIT IN DIAG_ALRT REGISTER

(RO)

OUT-OF-RANGE

THRESHOLD

VALUE

Current Under-Limit

CURRENTUL

CUL

0x8000 h

(2's complement)

Current Over-Limit

CURRENTOL

COL

0x7FFF h

(2's complement)

Bus Voltage Over-Limit

BUSOL

BOVL

0x7FFF h

(2's complement, positive

values only)

Bus Voltage Under-Limit

BUSUL

BUVL

0x0000 h

(2's complement, positive

values only)

Temperature Over-Limit

TMPOL

TEMP_LIMIT

0xFFFF h

(2's complement, positive

values only)

Power Over-Limit

POL

PWR_LIMIT

0x7FFF h

(2'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 holds the value of the pin even after

all diagnostic conditions have cleared. A read of the DIAG_ALRT register resets 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 function 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

is 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 always reads '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.

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INA745A, INA745B

SBOSAC3B – JULY 2023 – REVISED AUGUST 2025

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