71m6543h-igtr/f Maxim Integrated Products, Inc., 71m6543h-igtr/f Datasheet - Page 85

• Manufacturer Part Number: 71m6543h-igtr/f
• Description: Energy Meter Ic
• Manufacturer: Maxim Integrated Products, Inc.

(CTs) and current-sensing resistive shunts and how they are connected to the voltage and current inputs
of the 71M6543F/H. All input signals to the 71M6543F/H sensor inputs are voltage signals providing a
scaled representation of either a sensed voltage or current.
4
4.1
All digital input pins of the 71M6543F/H 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
v1.0
Application Information
Connecting 5 V Devices
Directly Connected Sensors
through
The analog input pins of the 71M6543F/H 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
R
IN
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)
IADCn
V3P3A
IADCn+1
IADCn
(n = 0, 2, 4 or 6)
IADCn+1
IADCn
71M6543F/H Data Sheet
85