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4.10 Switching power via the relays
The relays on the ‘Relay Module’ are rated at 100,000 switching operations at rated voltage and
current.
The relays are used to switch the following power signals:
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TARGET_VCC (Target Supply from programmer / ATE to Target System)
TARGET_VPP (Vpp supply from programmer to Target System)
To avoid premature wearing of the relay contacts due to contact arcing, it is recommended that all
power is removed from both the ATE System and the Target System (UUT) BEFORE the relays in the
programmer are switched ON or OFF. This prevents the relay contacts from arcing which can
gradually erode the contacts.
The following procedure is recommended when switching the relays ON or OFF:
Switching the RELAYs ON
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Make sure the external ATE / ICT has removed all power to the Target System (UUT)
If you are using any other external power supply to power the Target System, make sure this
power supply is also switched OFF.
Instruct the programmer to commence programming.
The relays contacts will close.
The ‘Programmer’ is now connected to the Target System (UUT).
After a pre-defined delay the power will be safely applied to the Target System (UUT) from the
‘Programmer controlled power supply’ (if enabled).
Switching the RELAYs OFF
ISPnano Series Programmer - User Manual – V1.11 – 12 May 2011
118
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The programmer will automatically switch the ‘Programmer controlled power supply’ OFF
and then wait a Debounce delay before switching the relays coils OFF.
If you are using any other external power supply to power the Target System, make sure this
power supply is switched OFF BEFORE you instruct the programmer to switch the relays
OFF.
Instruct the programmer to switch the relays OFF. (This is usually done automatically as part
of a project.)
The relays contacts will open
The ATE / ICT system is now connected to the Target System (UUT) again.
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