Programmer And Target System Are Independently Powered; Overview; Hardware Setup - Programmer And Target System Independently Powered - Equinox Systems EPSILON5 MKII User Manual

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Datasheet of EPSILON5-A1 - ISP PORTABLE PROGRAMMER USB
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3.6 Programmer and Target System are independently powered

3.6.1 Overview

In this scenario, the programmer is powered from a completely independent supply to the Target
System. The Jumper J9 is NOT fitted which isolates the Target Vcc voltage (V_TVCC) from CON1
VIN. This means that the programmer is always powered up.
Explanation of operation:
•
The programmer is always powered ON
•
Jumper J9 is removed
•
The Target Power Supply should be switched OFF before the ISP cable is plugged into it
•
The programmer does not draw any current from the Target System during programming
•
When programming is complete, the Target System should be powered OFF and then the ISP
cable removed
3.6.2 Hardware Setup - Programmer and Target System independently
powered
Warning!
•
The external voltage applied to the programmer via CON1 must be between 3.1 and 5.0V !
•
The voltage applied to the programmer via the ISP cable must be between 3.1 and 5.0V as
this voltage is used to drive the programmer I/O Stage. A 6V2 5W zener diode is internally
connected across the programmer supply to protect against over-voltage.
•
J9 must be removed to avoid contention between the two power supplies.
EPSILON5 MKII Programmer - User Guide V1.12 – 1
st
August 2007
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