Maxim Integrated 78M6612 M-API Library - Manual (Page 8)

78M6612 M-API Library User Guide UG_6612_036
8 Rev. 1.00
1.3.3 Example Calculation of Sensor Parameters
This example demonstrates the calculation of IMAX and VMAX for the default sensor configuration. For
more information on sensor selection and configuration, refer to the 78M6612 Hardware Design
Guidelines.
IMAX Calculation:
IMAX = Imax (pk) / sqrt(2) = Imax (rms)
Max ADC input = 250 mV = IMax (pk) * R shunt
Example:
With a 4 M
Ω current shunt, IMax (pk) = 62.5A
=> IMAX = 52 Amps.
VMAX Calculation:
VMAX = Vmax (pk) / sqrt(2) = Vmax (rms)
Max ADC input = 250 mV = Vmax (pk) * Shunt R / (Series R - Shunt R)
Example:
With a Series R of 2 M
Ω and a Shunt R of 750 ohms, VMax (pk) = 666.42 Volts.
=> VMAX = 471.23 Volts
1.4 Reference Documentation
• 78M6612 Data Sheet
• 78M6612 Hardware Reference Manual
• 78M6612 OMU Evaluation Board User Manual (reference schematics)
• 78M6612 OMU Demo Application User Manual (CLI)
• 78M6612 OMU Firmware Description Document (register descriptions)