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4.8 Target System powers the Programmer (5.0V only)
4.8.1 Overview
In this scenario, the programmer is powered from the Target System via the ISP cable. The Target
Voltage must be +5.0V for the programmer to operate correctly. This mode is not recommended for
general use as the programmer is powered on/off every time the Target System is powered on/off.
This can lead to over-voltage and ESD problems. It also makes the programming times longer as the
programmer must run its internal self-check algorithm every time it is powered up.
Fig. 4.8.1 Target System powers the programmer at 5.0V
Please note
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The external voltage applied to the programmer must be between 5.0V!
The Programming Project must specify a Target Voltage of +5.0V.
The Target System must be able to supply the worst case current required during a
programming operation.
A 6V2 5W zener diode is internally connected across the programmer supply to protect
against over-voltage.
PPM3 MKII Programmer - User Guide - V1.04 - 10 th May 2008
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