71M6541DSLASHFSLASHG datasheet(92/166 Pages) MAXIM

92 / 166 page

71M6541D/F/G and 71M6542F/G Data Sheet

Rev 5

Application Information

4.1

Connecting 5 V Devices

All digital input pins of the 71M654x 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

Direct Connection of Sensors

Figure 31 through Figure 34 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 71M654x. All input signals to the 71M654x sensor inputs are voltage signals providing a scaled

representation of either a sensed voltage or current.

The analog input pins of the 71M654x 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. Refer to the Demo Board schematics for complete sensor input circuits and

corresponding component values.

RIN

VIN

ROUT

V3P3A

Figure 31: Resistive Voltage Divider (Voltage Sensing)

IIN

IAP

V3P3A

VOUT

IOUT

RBURDEN

1:N

Noise Filter

Figure 32. CT with Single-Ended Input Connection (Current Sensing)

IIN

IAP

IAN

V3P3A

VOUT

IOUT

RBURDEN

1:N

Bias Network and Noise Filter

Figure 33: CT with Differential Input Connection (Current Sensing)

IIN

RSHUNT

IAP

IAN

V3P3A

VOUT

Bias Network and Noise Filter

Figure 34: Differential Resistive Shunt Connections (Current Sensing)

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