Alert

Output

17

INA300

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SBOS613B – FEBRUARY 2014 – REVISED APRIL 2016

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The very wide dynamic input range of the INA300 necessitates an adjustable hysteresis to ensure that the device

can be more appropriately configured based on the specific operating conditions and requirements of the

application. Figure 28 illustrates the transition locations for the ALERT terminal based on where the input signal,

settings for the device are shown in Table 5.

Figure 28. Typical Comparator Hysteresis

Table 5. Hysteresis Settings

HYSTERESIS

HYSTERESIS SETTING

Float

2 mV

GND

4 mV

8 mV

7.3.6 Alert Output

The device ALERT terminal is an active-low, open-drain output. This output is designed to be pulled low when

the input conditions are detected to be out-of-range. This open-drain output pin is recommended to include a

10-k

Ω, pull-up resistor to the supply voltage. This open-drain terminal can be pulled up to a voltage beyond the

7.3.7 Noise Adjustment Factor (NAF)

The device is a high-speed, low-noise comparator that is designed to alert when the measured input signal

exceeds the programmed limit level. Internal noise in the device couples into the measurement and can result in

alerts being issued prior to the input signal exceeding the voltage level present at the LIMIT terminal. This known

internal noise component effects the input signal measurement by causing a consistent shift in the device internal

internal shift, thus allowing for a more precise level detection of the measured current.

The NAF value is based on the noise contribution on the measurement at the 10-µs delay setting. This value is

effect included with the 50-µs and 100-µs delay settings inherently eliminates the effect internal noise has on the

effect of a lower trigger point of the alert output. Lowering the trigger point results in the device issuing an