INA233 datasheet(12/48 Pages) TI1

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Current Limit Detect Following

Every Shunt Voltage Conversion

Bus and Power Limit Detect

Following Every Bus Voltage Conversion

Power Average

Bus Voltage Average

Shunt Voltage Average

INA233

SBOS790 – APRIL 2017

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Product Folder Links: INA233

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Feature Description (continued)

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

conversion ready flag bit (MFR_ALERT_MASK, conversion ready bit) is provided to help coordinate one-shot or

triggered conversions. The conversion ready bit is set after all conversions, averaging, and multiplication

operations are complete.

The conversion ready bit clears under these conditions:

•

Writing to the MFR_ADC_CONFIG register, except when configuring the MODE bits for power-down mode; or

•

Reading the MFR_ALERT_MASK register

7.3.2 Interleaved Power Calculation

The current and shunt voltage measurements are interleaved to minimize time alignment errors in the power

measurement. Figure 23 shows that power is calculated following the bus voltage measurement based on the

previous current calculation and bus voltage measurement. The power calculation is performed in the

background and does not add to the overall conversion times for bus voltage or current. These current and

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

accumulation register instead of the corresponding output registers. Following every measured sample, the

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

measured and averaged based on the number of averages set in the MFR_ADC_CONFIG register.

Figure 23. Power Calculation Scheme

In addition to the current and power accumulating after every sample, the shunt and bus voltage measurements

are also collected. After all samples are measured and the corresponding current and power calculations are

made, the accumulated average for each parameter is then loaded to the corresponding output registers and can

then be read.

7.3.3 Power Accumulator and Energy Measurement

The INA233 has an integrated power accumulator that records the total accumulated power and the

corresponding sample count and rollover counts. The accumulated power and sample count is accessible

through the READ_EIN PMBus command and can be used for both energy metering and on-demand average

power calculations. The READ_EIN section details how to use the power accumulator for both average power

and energy calculations.

7.3.4 I2C-, SMBus-, and PMBus-Compatible Digital Interface

The INA233 features an I2C-compatible, 2-wire interface with an open-drain alert output. The data transfer format

is SMBus version 3.0 compliant and the device supports multiple PMBus commands that allow the device to be

easily used along side PMBus version 1.3 devices. Logic levels of 0.4 V (maximum VIL) and 1.4 V (minimum VIH)

allow the device to be used with digital bus voltages ranging from 1.8 V to 5.0 V (5.5-V maximum operating). The

digital interface can support clock speeds as high as 400 kHz and offers packet error checking for increased

communications robustness. The device supports group protocol as defined in the PMBus version 1.3.1

specification that allows the host processor to easily communicate with multiple devices on the bus.

INA233 Datasheet(PDF) 12 Page - Texas Instruments

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