EPSILON5 MKIV - USB Programmer - User Guide V1.05 19/09/12
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2.4.6 Programmer only powered from PC USB port
•
The programmer electronics (not the
Target System) is powered from the PC
USB port.
•
The host PC USB port must be capable
of supplying at least 70mA otherwise the
programmer will not function correctly.
•
The jumper link
‘USB-POWER’ (LK1)
should be fitted.
•
The Target System must be powered
from an independent power supply.
•
The
Jumper J9 must NOT be fitted
.
This disconnects the Target Vcc from the
Prog5V Vcc.
•
The
‘Target Vcc’
signal must still be
connected to the
‘Programmer Vcc’
signal on the ISP Header as this voltage
is used to power the
‘I/O Level
Convertor’.
2.4.7 Programmer and Target System powered from PC USB port
•
The programmer electronics and Target
System are powered from the PC USB
port.
•
The host PC USB port must be capable
of supplying at least 80mA + the Target
System load current otherwise the
programmer will not function correctly.
•
The programmer output voltage to the
Target System will be approximately
4.1V if the USB supply is OK.
•
The jumper link
‘USB-POWER’ (LK1)
should be fitted.
•
The
Jumper J9 should be fitted
. This
connects the Target Vcc to the
programmer regulated supply.
*** !!! Warning !!! ***
It is NOT recommended to power the
prog Target System from a PC
USB port unless the Target System only
takes minimal current. It is possible to
destroy both the programmer and your PC
USB port if excessive current is taken by the
Target System.
