Datasheet

UG-250 Evaluation Board User Guide
Rev. A | Page 4 of 12
Table 2. Link Options
Link No. Description
LK1 This link connects the V
LOOP
input pin to the LOOP+ voltage via a 20:1 resistor divider.
When this link is inserted, the V
LOOP
pin is connected to the resistor divider.
When this link is removed, the V
LOOP
pin is unconnected and can be connected to another voltage (maximum 2.5 V) via TP26.
LK2 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 REG
IN
pin.
LK4
This link enables/disables the
i
Coupler® digital isolators.
When this link is inserted, the isolators are enabled.
When this link is removed, the isolators are disabled.
LK6 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).
LK7 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 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).
Rint_Rext 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 4 mA to 20 mA
B A 3.8 mA to 21 mA
A B 3.2 mA to 24 mA
A A 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 1.8 V
B B A 2.5 V
B
A
B
3 V
B A A 3.3 V
A B B 5 V
A
B
A
9 V
A A B 12 V