INA3221 datasheet(38/50 Pages) TI2

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8.2.1 Design Requirements

For this design example, use the input parameters shown in Table 8-1. All other register settings are default.

Table 8-1. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Supply voltage, VS

Pull-up resistors

10kΩ

Input range

–163.84 to +163.8

Enabled channel

CH1

Operating mode

Shunt voltage, continuous

Average setting

Critical alert limit

80mV

Critical Alert Limit register setting

7D0h

8.2.2 Detailed Design Procedure

This design shows two shunt voltage conversion times to demonstrate the difference in the alert response times.

This design generates a critical-alert response when the input voltage exceeds 80mV on channel 1. See Table

8-1 for all design parameters.

For the first example the shunt voltage conversion time is set to 1.1ms. When the input signal exceeds 80mV,

the Critical alert pin pulls low after the conversion cycle completes, indicating an overcurrent condition, as shown

in Figure 8-2.

For the second example, the conversion time is set to 588µs, and the response is shown in Figure 8-3.

8.2.3 Application Curves

Figure 8-2 shows the Critical alert pin response to a shunt voltage overlimit of 80mV for a conversion time of

1.1ms. Figure 8-3 shows the response for the same limit, but with the conversion time reduced to 588µs.

Time (200 s/div)

CRITICAL ALERT

INPUT

LIMIT

Configuration register = 4125h, conversion time = 1.1ms

Figure 8-2. Critical Alert Response for 1.1ms

Conversion Time

Time (100 s/div)

CRITICAL ALERT

INPUT

LIMIT

Configuration register = 40DDh, conversion time = 588µs

Figure 8-3. Critical Alert Response for 588µs

Conversion Time

8.3 Power Supply Recommendations

The input circuitry of the device can accurately measure signals on common-mode voltages beyond the power

supply voltage, VS. For example, the voltage applied to the VS power supply terminal can be 5V, whereas the

load power-supply voltage being monitored (the common-mode voltage) on any one of the three channels can

be as high as 26V. Note also that the device can withstand the full 0V to 26V range at the input terminals,

INA3221

SBOS576C – MAY 2012 – REVISED SEPTEMBER 2025

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