Microchip Technology MPLAB ICE, User Manual

Page: 33 / 192

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2001 Microchip Technology Inc. DS51159B-page 33
Overview and Installation
Refer to the MPLAB ICE Processor Module and Device Adapter Specification
(DS51140) for processor module power requirements before configuring the
system for target system power.
When connecting to a target application system, you may notice a voltage
level on the target application, even though you have not yet applied power to
the target application circuit. This is normal and is due to current leakage of
protection diodes through V
CC
of the Device Adapter. The current leakage will
typically be less than 20 mA. However, if the target application is using a
voltage regulator, it should be noted that some regulators require the use of
an external shunt diode between V
IN
and V
OUT
for reverse-bias protection.
Refer to the manufacture’s data sheets for additional information.
1.8.2 Turning On the System Components – Low Voltage
Emulation
MPLAB ICE also supports low voltage emulation, from 2.0V to 4.5V. In this
configuration, power MUST BE SUPPLIED by the target system.
Follow these steps when applying power to the system.
1. Assemble the MPLAB ICE emulator system, but DO NOT plug the
device adapter into the transition socket on the target board yet.
For instructions on how to assemble the emulation system, see the Quick
Start (Chapter ) or Installation (Chapter 1) chapters.
2. Turn on the PC and start MPLAB.
Note: When power is supplied by the emulator pod, MPLAB ICE loads
the system at 10 mA typical. When power is supplied by the target
system, MPLAB ICE loads the system at 80 mA typical.
Note: When power is supplied by the emulator pod, MPLAB ICE loads
the system at 10 mA typical. When power is supplied by the target
system, MPLAB ICE loads the system at 80 mA typical.
Warning
Damage to the Emulator System and/or Target
Application may occur if these steps are not followed.