External Vcc - Programmer Controlled Switch - Equinox Systems ISPnano I Series User Manual

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Datasheet of ISPNANO S3 KIT - ISP PORTABLE PROGRAMMER
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4.6 External VCC – programmer controlled switch
The ISPnano programmer features a special 'External VCC Switch' circuit which allows an 'External
Voltage (V_EXT)' in the range of 1.6V – 24V to be switched through the programmer to the Target
System under project control. This feature is useful when the Target System features a 'Voltage
Regulator Circuit' which needs to be powered from a higher voltage than +5V. In order to power
many Target Systems, it is necessary to apply a voltage of eg. 7 – 24V to the input of the Target
System regulator circuit.
Power supply features:
Allows an 'External power supply' to be switched under programmer control to a Target
•
System (UUT)
Any voltage between 1.2 and 30V can be switched via the 'External VCC Switch' circuit.
•
The 'External VCC Switch' circuit is rated at 1 Amp.
•
Internal self-resetting fuse for protection against short-circuit conditions
•
Both the input and output 'External Voltage (V_EXT)' can measured by the programmer
•
The diagram below shows a typical example where an external power supply is switched to the
Target System (UUT) through the programmer.
Fig. 4.6 ISPnano – Powering Target System using External Switched Voltage
62 ISPnano Series Programmer - User Manual – V1.11 – 12
th
May 2011