AC244026, AC244027

Header Identification

The AC number is used for ordering the Processor Extension Pak, which contains the debug header. However, this number is not on the header, as the board may be used for multiple headers by inserting different -ICE/-ICD devices. To identify these headers, use the following information.

AC Number -ICE/-ICD Device Board Assembly Number
AC244026 PIC16F727-ICE 02-02105
AC244027 PIC16LF727-ICE

Header Setup and Operation

This Processor Extension Pak provides extra debugging capability not available on the production devices:

  • Three Address / Data breakpoints (one Address only breakpoint on production devices)
  • Data capture (Real Time Data Streaming)
  • No user Flash resources needed for debugging
  • No user RAM resources needed for debugging
  • No user pins required

This header has jumpers available for MCLR pull-up and power LED control:

Jumper Setting Function
J2 Open Disable weak ICE MCLR pull-up resistor.
Short Enable weak ICE MCLR pull-up resistor.
This option keeps the target program running even after the tool
has been disconnected from the header, i.e., the pin will not
float high.
J3 Open Disable power LED indicator. This option saves power.
Short Enable power LED indicator.
AC244026 Header

Additionally, this header has jumpers related to the LDO voltage regulator. Depending on the device pin used for this function, you would use either J4 (RA0), J5 (RA5) or J6 (RA6) for Vcap selection. For details on the voltage regulator, see the PIC16F72X/PIC16LF72X Data Sheet (DS41341).

Jumper Setting Function
J4, J5
or J6
Open Use only target capacitance for Vcap.
This is the standard configuration.
Short Use both on-board and target capacitance for Vcap.
This option is to provide extra margin for the voltage regulator
stability/regulation in cases where there is a long lead length
between the emulation header Vcap pin and the target Vcap pin.
(As examples, when using long-pin DIP transition sockets or
certain QFN transition sockets.)

Test points are available on this header to check the following:

Test Point Signal Test Point Signal Pin Jumper
TP1 Vss TP6 Vcap RA0 J4
TP2 Vdd TP7 Vcap RA5 J5
TP3 ICD Enable TP8 Vcap RA6 J6
TP4 Vdd
TP5 Vss
AC244027 Header

This header has jumpers available for MCLR pull-up and power LED control.

Test Point Signal
TP1 Vss
TP2 Vdd
TP3 ICD Enable
TP4 Vdd
TP5 Vss

Header Limitations

Sometimes a header device (-ICE/-ICD) has operational issues or errata. To determine if a device on a header has limitations, see your hardware tool documentation.

Header Dimensions

The figure below lists the dimensions for the debug header. Dimensions are design values in inches.

If the length and/or width of the debug header is too large a footprint for the target board, consider using stand-offs, transition sockets or other extenders in the header connection socket to raise the header above the target.

Figure: Dimensions - AC244026, AC244027

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