UG-250
Evaluation Board User Guide
Table 2. Link Options
Link No.
Description
LK1
This link connects the VLOOP input pin to the LOOP+ voltage via a 20:1 resistor divider.
When this link is inserted, the VLOOP pin is connected to the resistor divider.
When this link is removed, the VLOOP pin is unconnected and can be connected to another voltage (maximum 2.5 V) via TP26.
LK2
LK4
This link enables/disables the MOSFET device.
Position A disables the MOSFET device.
Position B enables the MOSFET device and the loop supply is connected directly to the REGIN pin.
This link enables/disables the iCoupler® digital isolators.
When this link is inserted, the isolators are enabled.
When this link is removed, the isolators are disabled.
LK6
LK7
This link should be inserted when the MOSFET device is enabled (LK2 in Position B).
This link should be removed when the MOSFET device is disabled (LK2 in Position A).
This link completes the loop connection if a load resistor is not connected at Connector J7.
This link should be inserted if a load resistor is not connected at Connector J7.
This link should be removed if a load resistor is connected at Connector J7.
Alarm_Dir
Rint_Rext
This link selects the alarm current direction.
Position A selects an upscale alarm current (22.8 mA or 24 mA).
Position B selects a downscale alarm current (3.2 mA).
This link selects to use either the internal or external current setting resistor.
Position A selects the internal resistor.
Position B selects the external resistor.
Range0,
Range1
These links select the loop current range.
Range1 Range0 Loop Range
B
B
A
A
B
A
B
A
4 mA to 20 mA
3.8 mA to 21 mA
3.2 mA to 24 mA
3.8 mA to 21 mA
Reg_Sel2,
Reg_Sel1,
Reg_Sel0
These links select the voltage regulator output voltage.
Reg_Sel2 Reg_Sel1 Reg_Sel0 Regulator Output Voltage
B
B
B
B
A
A
A
B
B
A
A
B
B
A
B
A
B
A
B
A
B
1.8 V
2.5 V
3 V
3.3 V
5 V
9 V
12 V
Rev. A | Page 4 of 12
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