71M6543GH MAXIM [Maxim Integrated Products], 71M6543GH Datasheet - Page 86

• Manufacturer Part Number: 71M6543GH
• Description: Selectable Gain of 1 or 8 for One Current Energy Meter ICs Metrology Compensation
• Manufacturer: MAXIM [Maxim Integrated Products]

(CTs) and current-sensing resistive shunts and how they are connected to the voltage and current inputs
of the 71M6543. All input signals to the 71M6543 sensor inputs are voltage signals providing a scaled
representation of either a sensed voltage or current.
71M6543F/H and 71M6543G/GH Data Sheet
4
4.1
All digital input pins of the 71M6543 are compatible with external 5 V devices. I/O pins configured as
inputs do not require current-limiting resistors when they are connected to external 5 V devices.
4.2
Figure 27
86
Application Information
Connecting 5 V Devices
Directly Connected Sensors
through
The analog input pins of the 71M6543 are designed for sensors with low source impedance.
RC filters with resistance values higher than those implemented in the Teridian Demo Boards
must not be used. Please refer to the Demo Board schematics for complete sensor input
circuits and corresponding component values.
Figure 30: Differential Resistive Shunt Connections (Current Sensing)
Figure 28. CT with Single-Ended Input Connection (Current Sensing)
Figure 29: CT with Differential Input Connection (Current Sensing)
Figure 30
Figure 27: Resistive Voltage Divider (Voltage Sensing)
CT
© 2008–2011 Teridian Semiconductor Corporation
show voltage-sensing resistive dividers, current-sensing current transformers
I
IN
1:N
CT
I
I
IN
IN
R
1:N
SHUNT
I
OUT
V
IN
V
R
I
OUT
OUT
BURDEN
R
Bias Network and Noise Filter
BURDEN
V
OUT
V3P3A
Bias Network and Noise Filter
V
OUT
V3P3A
R
Noise Filter
OUT
(n = 8, 9 or 10)
VADCn
V3P3A
(n = 0,1,...7)
(n = 2, 4 or 6)
V3P3A
IADCn
IADCn+1
IADCn
(n = 0, 2, 4 or 6)
IADCn
IADCn+1
v1.2