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The
melabs Field Programmer can be powered by the target circuit board if the
proper connections are made. The power connections shown on this page may
not be appropriate for use with our other programmers. See the standard
ICSP page for details.
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Pin Descriptions
| PIN# |
SIGNAL |
| 1 |
Vdd input - This pin can be used to power the
melabs Field Programmer. The safe voltage range is 3.3V to
5.5V. The voltage should match that which is supplied to the
target device to be programmed. |
| 2 |
Programming Voltage (Vpp) - Connect to MCLR/Vpp pin
on target device. |
| 3 |
Reserved - do not connect |
| 4 |
Alternative Vdd input - No connection by
default. A jumper can be shorted on the Field Programmer PCB
that connects this pin to pin-1. |
| 5 |
Reserved - do not connect |
| 6 |
Programming Data - Connect to PGD or ICSPDAT on the
target PICmicro |
| 7 |
Reserved - do not connect |
| 8 |
Programming Clock - Connect to PGC or ICSPCLK on
the target PIC MCU. |
| 9, 10 |
Ground - A ground connection to your target board
is required. |
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Design considerations for ICSP-capable circuits:
If your new design needs to be ICSP-capable, there are some things you should
consider. Details can be found on the standard
ICSP support page.
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Powering the melabs Field Programmer:
The Field Programmer does not have an internal power source. It must be
powered with a connection to the 10-pin ICSP connector. This can be
accomplished in two ways.
1. Power supplied by target board. As detailed below,
the programmer can draw power directly from the target that it is
programming. This makes it very convenient if the target board has the
necessary connection. See the schematic below for wiring details.
2. Power supplied by in-line Power Adapter. In some
circumstances, it isn't feasible to draw power from the target board. The
target board may not be able to support the current requirements of the
programmer or -as in the case of a programming adapter- the target may need to
draw power from the ICSP connection. For these situations, a Power Adapter
is available that connects between the programmer and target. The adapter
accepts DC power from a wall adapter (ac adapter) and provides regulated voltage
to the programmer and (if desired) the target. The output of the Power
Adapter can be changed to accommodate the target requirements (requires
installation of an additional resistor).
Regardless of the method used to power the melabs Field
Programmer, the programmer must be supplied with the exact voltage that is
required on Vdd of the target PIC microcontroller. If your PIC runs at
3.3V and you power the programmer at 5V, you risk damage to the target board.
Some of the new PIC microcontrollers cannot by powered at 5V. If you
are programming such a device with the Field Programmer, Power Adapter, and a
Programming Adapter, you may need to modify/configure the programming
adapter. See
the following link for details: PIC18FxxJ,
PIC18FxxK, PIC24xJ, and dsPIC33FJ 3.3 Volt Programming Information
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ICSP Schematic example for use with melabs Field
Programmer: The following schematic shows a typical ICSP connection that could be used
with the melabs Field Programmer. The notable difference from the standard
ICSP circuit is the power connection to pin-1 of the ICSP connector.
This supplies power to the Field Programmer. The Field Programmer may be
powered from 3.3V to 5.5V.
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