INA3221-Q1 datasheet(36/45 Pages) TI1

Part #	INA3221-Q1

Description	Current and Voltage Monitor with Programmable Overcurrent Alerts

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Time (200 Ps/div)

CRITICAL ALERT

INPUT

LIMIT

Time (100 Ps/div)

CRITICAL ALERT

INPUT

LIMIT

36

INA3221-Q1

SBOS776B – MARCH 2016 – REVISED MARCH 2016

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Typical Application (continued)

9.2.1 Design Requirements

For this design example, use the input parameters shown in Table 25. All other register settings are default.

Table 25. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Supply voltage, VS

5 V

Pull-up resistors

10 k

Ω

Input range

–163.84 to +163.8

Enabled channel

CH1

Operating mode

Shunt voltage, continuous

Average setting

1

Critical alert limit

80 mV

Critical Alert Limit register setting

7D0h

9.2.2 Detailed Design Procedure

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

response times. This design generates a critical-alert response when the input voltage exceeds 80 mV on

channel 1. See Table 25 for all design parameters.

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

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

in Figure 53.

For the second example, the conversion time is set to 588 µs, and the response is shown in Figure 54.

9.2.3 Application Curves

Figure 53 shows the Critical alert pin response to a shunt voltage overlimit of 80 mV for a conversion time of 1.1

ms. Figure 54 shows the response for the same limit, but with the conversion time reduced to 588 µs.

Configuration register = 4125h,

conversion time = 588 µs

Figure 53. Critical Alert Response for 1.1-ms Conversion

Time

Configuration register = 40DDh,

conversion time = 588 µs

Figure 54. Critical Alert Response for 588-µs Conversion

Time

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INA3221-Q1 Datasheet(PDF) 36 Page - Texas Instruments

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