71M6521DH MAXIM [Maxim Integrated Products], 71M6521DH Datasheet - Page 60
71M6521DH
Manufacturer Part Number
71M6521DH
Description
Energy Meter ICs
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
1.71M6521DH.pdf
(107 pages)
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
71M6521DH-IGT
Manufacturer:
TERIDIAN
Quantity:
3 000
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APPLICATION INFORMATION
Figure 28 and Figure 29 show how resistive dividers, current transformers, and restive shunts are connected to the
voltage and current inputs of the 71M6521DE/DH/FE.
The 71M6521DH (high-accuracy) part 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 reference 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 correction coefficients PPM1 and
PPMC2 per the formulae given in VREF, VBIAS section. See Temperature Compensation section for additional
details.
The fuse TRIMBGB is non-zero for the high-accuracy parts and zero for the regular parts.
Page: 60 of 107
V
in
Distinction between 71M6521DE/71M6521FE and 71M6521DH Parts
VA = Vin * R
Figure 28: Resistive Voltage Divider (Left), Current Transformer (Right)
R
in
Connection of Sensors (CT, Resistive Shunt)
out
/(R
out
R
+ R
out
in
)
Figure 29: Resistive Shunt
VA
71M6521DE/DH/FE Data Sheet
Rev 2
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