INA230 datasheet(12/44 Pages) TI2

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Configuration register (00h) are set to '111'), the INA230 continuously converts a shunt voltage reading followed

by a bus voltage reading. After the shunt voltage reading, the current value is calculated (based on Equation 3).

This current value is then used to calculate the power result (using Equation 4). These values are subsequently

stored in an accumulator, and the measurement/calculation sequence repeats until the number of averages set

in the Configuration register (00h) is reached. Following every sequence, the present set of values measured

and calculated are appended to previously collected values. After all of the averaging is complete, the final

values for shunt voltage, bus voltage, current, and power are updated in the corresponding registers that can

then be read. These values remain in the data output registers until the data are replaced by the next fully

completed conversion results. Reading the data output registers does not affect a conversion in progress.

The mode control in the Conversion register (00h) also permits selecting modes to convert only the shunt

voltage or the bus voltage to further allow the user to configure the monitoring function to fit the specific

application requirements.

All current and power calculations are performed in the background and do not contribute to conversion time.

In triggered mode, writing any of the triggered convert modes into the Configuration register (00h) (that is, MODE

bits of the Configuration register (00h) are set to ‘001’, ‘010’, or ‘011’) triggers a single-shot conversion. This

action produces a single set of measurements; thus, to trigger another single-shot conversion, the Configuration

In addition to the two operating modes (continuous and triggered), the device also has a power-down mode

that reduces the quiescent current and turns off current into the device inputs, reducing the impact of supply

drain when the device is not being used. Full recovery from power-down mode requires 40µs. The registers of

the device can be written to and read from while the device is in power-down mode. The device remains in

power-down mode until one of the active modes settings are written into the Configuration register (00h).

Although the device can be read at any time, and the data from the last conversion remain available, the

Conversion Ready flag bit (Mask/Enable register, CVRF bit) is provided to help coordinate one-shot or triggered

conversions. The Conversion Ready flag (CVRF) bit is set after all conversions, averaging, and multiplication

operations are complete.

The Conversion Ready flag (CVRF) bit clears under these conditions:

• Writing to the Configuration register (00h), except when configuring the MODE bits for power-down mode; or

• Reading the Mask/Enable register (06h)

7.3.2 Power Calculation

The Current and Power are calculated following shunt voltage and bus voltage measurements (see Figure

7-1). Current is calculated following a shunt voltage measurement based on the value set in the Calibration

calculated following the bus voltage measurement based on the previous current calculation and bus voltage

measurement. If there is no value loaded in the Calibration register, the power value stored is also zero. Again,

these calculations are performed in the background and do not add to the overall conversion time. These current

and power values are considered intermediate results (unless the averaging is set to 1) and are stored in an

internal accumulation register, not the corresponding output registers. Following every measured sample, the

newly-calculated values for current and power are appended to this accumulation register until all of the samples

have been measured and averaged based on the number of averages set in the Configuration register (00h).

INA230

SBOS601B – FEBRUARY 2012 – REVISED JANUARY 2025

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