Switching The Relays Off; Leaving The Relays On At The End Of A Project - Equinox Systems ISPnano I Series User Manual

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Datasheet of ISPNANO S3 KIT - ISP PORTABLE PROGRAMMER
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The 'External Vcc Input Voltage' is the voltage applied to the 'DC EXT' connector.
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The 'External Vcc Output Voltage' is the voltage applied to the relay coils which will be
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slightly lower that the 'External Vcc Input Voltage' due to the volt drop across the FET
switch.
Now that the relay coils are energised, the 'Target ISP Port' connections are routed to the
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'Internal Programmer Power / Line Driver Circuitry' and the external ATE System is now
disconnected.
It should now be possible to power up and program a device on the Target System (UUT).
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4.7 Switching the RELAYs OFF

The RELAYs can be switched OFF by simply performing a 'Programmer Reset'.
Instructions:
Click the button
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The 'EXT-VCC' switch is switched OFF and so the relays switch OFF.
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The signals on 'TARGET ISP Port' are now connected back to the 'ATE Port'.
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The programmer circuitry is now completely isolated from both the ATE and Target System.
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4.8 Leaving the RELAYs ON at the end of a project

If your programming sequence involves multiple programming steps then you probably do not want
the relays to switch OFF and then ON again after each step in the sequence. This would waste time
waiting for the 'Relay Debounce delay' and would also wear the relays out quicker. To around this
problem, it is possible to force the relays to stay ON at the end of 'Programming Project' so that the
next programming action does not have to switch them on again.
To force the RELAYs to stay ON at the end of a project:
ENABLE the 'External Target Vcc Switch'.
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ENABLE the 'Target Vcc is left switched ON at end' option – see illustration below.
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When the project is executed either in 'EDS Mode' or 'Standalone Mode', the RELAYs will
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remain ON at the end of the project and will not switch OFF until a 'RESET Programmer'
command is sent.
116 ISPnano Series Programmer - User Manual – V1.11 – 12
Tick this option to
keep RELAYs on at
end of project
th
May 2011