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Part Number: INA233
Asking for the INA233 design
Customer is designing INA233
Would you please provide comment for the following questions?
1. I am not sure I understand the first question. The MCU can read the INA233 as fast as the SCL frequency will allow. The maximum specified operating SCL frequency is 400kHz for the INA233.
2. The INA233 response time is a function of how the part is programmed: the operating mode (shunt only or shunt & bus), the conversion time (tCT) and the number of averages (N). The conversion times account for the signal sampling, acquisition, and register updating. So if you want the fastest possible sampling of the shunt voltage, then you will set the operating mode to "Shunt voltage, continuous" (see Table 27 of datasheet), set shunt voltage conversion time to 140µs (Table 26), and the number of averages to 1 (Table 24). As long as the MCU reads the INA233 every 140µs, the system can sample the shunt voltage every 140µs.
If the mode is changed to Shunt and bus voltage and the bus voltage tCT is also 140µs, continuous, then new data is available to read by MCU every 2*140µs = 280µs.
If the averages is changed to 3 and mode is still Shunt and bus voltage, continuous, then new data is available every 3*2*140µs =840µs.
See sections 7.3.2 and 7.4.3 for more explanation as to how registers are update and alerts are reported.
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