参数资料
型号: 71M6545-IGTR/F
厂商: Maxim Integrated
文件页数: 71/133页
文件大小: 0K
描述: IC ENERGY METER 3PHASE 64LQFP
标准包装: 1,500
系列: *

71M6545/71M6545H Data Sheet
4
4.1
APPLICATION INFORMATION
Connecting 5 V Devices
All digital input pins of the 71M6545/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
Directly Connected Sensors
Figure 23 through Figure 26 show voltage-sensing resistive dividers, current-sensing current transformers
(CTs) and current-sensing resistive shunts and how they are connected to the voltage and current inputs
of the 71M6545/H. All input signals to the 71M6545/H sensor inputs are voltage signals providing a
scaled representation of either a sensed voltage or current.
The analog input pins of the 71M6545/H are designed for sensors with low source impedance.
RC filters with resistance values higher than those implemented in the Demo Boards must not
be used. Please refer to the Demo Board schematics for complete sensor input circuits and
corresponding component values.
VADCn
(n = 8, 9 or 10)
V IN
R OUT
V3P3A
Figure 23: Resistive Voltage Divider (Voltage Sensing)
I IN
I OUT
IADCn
(n = 0,1,...7)
CT
R BURDEN
V OUT
Noise Filter
V3P3A
1:N
Figure 24. CT with Single-Ended Input Connection (Current Sensing)
I IN
I OUT
IADCn
(n = 0, 2, 4 or 6)
CT
R BURDEN
V OUT
V3P3A
IADCn+1
1:N
Bias Network and Noise Filter
Figure 25: CT with Differential Input Connection (Current Sensing)
I IN
IADCn
(n = 2, 4 or 6)
V3P3A
R SHUNT
V OUT
IADCn+1
Bias Network and Noise Filter
Figure 26: Differential Resistive Shunt Connections (Current Sensing)
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