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71M6533/G/H and 71M6534/H Data Sheet
3 Application Information
FDS_6533_6534_004
3.1
Connection of Sensors (CT, Resistive Shunt)
Figure 31 through Figure 33 show how resistive dividers, current transformers, Rogowski coils and resistive
shunts are connected to the voltage and current inputs of the 71M6533/71M6534.
The analog input pins of the 71M65XX are designed for sensors with low source impedance. RC
filters with components differing from the components used in the Teridian Demo Boards should be
avoided. See Application Note AN5292 for details on filter implementation.
VA = Vin * R out /(R out + R in )
VA
V in
R in
R out
Figure 31: Resistive Voltage Divider
I in
I out
R
IA
V out
I IN
I OUT
V OUT
R
V DIFF
InP
V3P3A
1/N
Filter
V3P3
1/N
InN
Figure 32: CT with Single Ended (Left) and Differential Input (Right) Connection
I in
R
IA
V out
I in
1/N
Vout = dI in /dt
R
V out
IA
V C
V3P3
V3P3
Figure 33: Resistive Shunt (Left), Rogowski Sensor (Right)
Note: Ferrites or other inductive components must not be connected directly to the sensor input pins (InP,
InN Vn).
3.2
Distinction between 71M6533/71M6534 and 71M6533G/H/71M6534H Parts
The 71M6533G, 71M6533H, and 71M6534H (high-accuracy) parts go through an additional process of
characterization during production which makes them suitable to high-accuracy performance over
temperature.
The first process, applied to all parts is the trimming of the reference voltage to the target value of 1.195
V.
The second process, which is applied only to the high-accuracy parts, is the characterization of the re-
ference voltage over temperature. The coefficients for the reference voltage are stored in trim fuses (I/O
RAM registers TRIMBGA , TRIMBGB , TRIMM[2:0] . The MPU can read these trim fuses and calculate the
68
Rev 2
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71M6541F-DB DEMO BOARD 71M6541F
71M6543F-DB-CT DEMO BOARD 71M6543F-DB-CT
72-CNV-5 CONVERTER RS-232 TO RS-422 5V
72346-001 72346-1-SCA-II REC
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