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71M6511 Datasheet(PDF) 76 Page - Teridian Semiconductor Corporation |
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71M6511 Datasheet(HTML) 76 Page - Teridian Semiconductor Corporation |
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76 / 95 page  71M6511/71M6511H Single-Phase Energy Meter IC DATA SHEET AUGUST 2007 Page: 76 of 95 © 2005-2007 TERIDIAN Semiconductor Corporation V2.6 APPLICATION INFORMATION Connection of Sensors (CT, Resistive Shunt, Rogowski Coil) Figure 29 and Figure 30 show how resistive dividers, current transformers, restive shunts, and Rogowski coils are connected to the voltage and current inputs of the 71M6511. VA = Vin * R out/(Rout + Rin) V in R in R out VA Figure 29: Resistive Voltage Divider (left), Current Transformer (right) Vout = R * I in V out R I in I in IA V3P3 Figure 30: Resistive Shunt (left), Rogowski Coil (right) Distinction between 71M6511 and 71M6511H Parts 71M6511H parts go through a process of trimming and characterization during production that make them suitable to high- accuracy applications. The first process applied to the 71M6511H is the trimming of the reference voltage, which is guaranteed to have accuracy over temperature of better that ±10PPM/°C. The second process applied to the 71M6511H is the characterization of the reference voltage over temperature. The coefficients for the reference voltage are stored in so-called trim fuses (I/O RAM registers TRIMBGA, TRIMBGB, TRIMM[2:0]. The MPU program can read these trim fuses and calculate the correction coefficients PPM1 and PPM2 per the formulae given in the Performance Specifications section (VREF, VBIAS). See the Temperature Compensation section for details. The fuse TRIMBGB is non-zero for the 71M6511H part and zero for the 71M6511 part. Trim fuse information is not available for non-H parts. Thus, the standard are to be applied. These settings are: • PPMC = TC1 * 22.46 = –149 • PPMC2 = TC2 * 1150.1 = –392 Vout = R * I out = R * Iin/N V out R 1/N Iin Iout Iin I out core Filter V3P3 IA Vout = dI in /dt V out R 1/N I in V C V3P3 IA Vout = dI in /dt V out R 1/N I in V C V3P3 IA |
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