SW12 current limits
Temperature (°C) Current Limit
1
(mA)
50° 690
70° 550
80° 470
1
Thermal fuse hold current. Overload causes voltage drop.
Disconnect and let cool to reset. Operate at limit if the application
can tolerate some fluctuation.
10.4.3 5V and 3.3V
5V: One regulated 5V output. Supply is shared between the 5V terminal and CS I/O DB9 5 V
output.
l Voltage Output: Regulated 5 V output (±5%)
l Current Limit: 230 mA
VX: Four independently configurable voltage terminals (VX1-VX4). When providing voltage
excitation, a single 16-bit DAC shared by all VX outputs produces a user-specified voltage during
measurement only. In this case, these terminals are regularly used with resistive-bridge
measurements (see Resistance measurements (p. 63) for more information). VX terminals can also
be used to supply a selectable, switched, regulated 3.3 or 5 Vdc power source to power digital
sensors and toggle control lines.
Range Resolution Accuracy
1,2
Maximum
Source/Sink
Current
3
Voltage
Excitation
±4 V 0.06 mV
±(0.1% of setting
+ 2 mV)
±40 mA
Switched,
Regulated
+3.3 or 5 V 3.3 or 5 V ±5% 50 mA
1
Valid over -55 to +85 °C temperature range
2
Note that ratiometric accuracy, rather than the absolute accuracy of excitation or analogue measurement,
determines the accuracy of ratiometric resistance measurements.
3
Exceeding current limits causes voltage output to become unstable. Voltage should stabilize when current is
reduced to within stated limits.
10. Specifications 165
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