2600S-901-01 Rev. C / January 2008 Return to Section Topics 10-3
Series 2600 System SourceMeter® Instruments Reference Manual Section 10: Digital I/O and Triggering
Digital I/O lines
The port provides 14 digital I/O lines. Each output is set high (+5V) or low (0V) and can read high
or low logic levels. Each digital I/O line is an open-drain signal.
+5V output
The Digital I/O Port provides a +5V output that is used to drive external logic circuitry. Maximum
current output for this line is 600mA. This line is protected by a self-resetting fuse (one hour
recovery time).
Output Enable and Interlock line
The Model 2601/2602 OE (output enable) line and the Model 2611/2612/2635/2636 INT (Interlock)
line of the Digital I/O can be used with a switch in the test fixture or component handler. With
proper use, power is removed from the DUT when the lid of the fixture is opened. See
"Output
Enable (Models 2601/2602)" for Model 2601/2602 operation details, or "Interlock (Models 2612/
2612/2635/2636)" for Model 2611/2612/2635/2636 operation details, described later in this
section.
WARNING The Digital I/O port of the Model 2601/2602 SourceMeter is not
suitable for control of safety circuits and should not be used to
control a safety interlock. The Model 2611/2612/2635/2636
SourceMeter Digital I/O port includes an Interlock line to be used as
safety interlock. When an interlock is required for safety, a
separate circuit should be provided that meets the requirements of
the application to reliably protect the operator from exposed
voltages.
Digital I/O configuration
Figure 10-2 shows the basic configuration of the Digital I/O port. Writing a 1 to a line sets that line
high (~ +5V). Writing a 0 to a line sets that line low (~0V). Note that an external device pulls an I/O
line low by shorting it to ground, so that a device must be able to sink at least 480μA per I/O line.
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