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4.5 Switching EXTERNAL VCC to the Target System
4.5.1 Overview
The ISPnano programmer features a special ‘External VCC Switch’ circuit which allows an ‘External
Voltage (V_EXT)’ in the range of 1.6V – 24V to be switched through the programmer to the Target
System under project control. This feature is useful when the Target System features a ‘Voltage
Regulator Circuit’ which needs to be powered from a higher voltage than +5V. In order to power
many Target Systems, it is necessary to apply a voltage of eg. 7 – 24V to the input of the Target
System regulator circuit.
The diagram below shows a typical example where an external power supply is switched to the
Target System through the programmer.
Fig. 4.5.1. ISPnano – Powering Target System using External Switched Voltage
ISPnano Programmer
Target System (UUT)
Target
External
Target
DC-EXT
connector
pin1
EXT DC
SWITCH
IDC PIN 3+4
Vin
Voltage Regulator
circuit
Power Supply
V EXT
1.6 - 24.0V
DC-IN
Programmer
IDC PIN 1+2
V TARGET
V TPS
V TARGET_REG
V TARGET_REG
POWER Input
(DC IN connector
pin 1)
Line
Driver
Circuit
RESET
Target
IC
Measure
V TARGET
Programmer
Programming
I/O Lines
to Target
lines
C T
Programmer
Power Supply
9.0 - 24.0V
Programmer
POWER 0V (DC IN
System
Programmer Signal
0V (IDC PIN 5+6)
Signal 0V
R T
connector pin 2)
POWER 0V
STAR connected EARTH point
Power 0V
ISPnano Series Programmer - User Manual – V1.11 – 12 May 2011
70
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An ‘External’ voltage ‘VEXT’ in the range of 1.6 – 24.0V is fed into the EXT-VCC-IN
connector of the programmer from an external power supply.
This voltage is then switched by the ‘External Vcc Switch’ inside the programmer to the EXT-
VCC-OUT pins on the ‘Target ISP Port’ of the programmer.
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