AN2159

Converting readings into measured values

Doc ID 11400 Rev 3

19/23

Each block of the path contributes to the signal processing with the parameters shown

below.

Table 2 shows the variable parameters that must be consider as inputs for the following

calculation while Table 3 shows device internal constant parameters.

The value of the current channel gain Ai depends on the selected current sensor. Please

refer to the datasheet for the proper value to select.

Figure 8.

Current conditioning

Figure 9.

Current signal path

Table 2.

Input parameters

Parameter

Meaning

R1, R2

Voltage Divider Resistors Value [Ohm]

Ks

Current Sensor Sensitivity Value [V/A]

x_i_rms

RMS Current Register Value expressed as decimal

x_u_rms

RMS Voltage Register Value expressed as decimal

x_i_mom

Momentary Current Register Value expressed as decimal

x_u_mom

Momentary Voltage Register Value expressed as decimal

x_f

Frequency Register Value expressed as decimal

Ai

Current Channel Gain