Target System Powers The Programmer (5.0V Only); Overview - Equinox Systems PPM3 MK2 User Manual

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
•
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.
68 PPM3 MKII Programmer - User Guide - V1.04 - 10
th
May 2008