AC244026, AC244027
Header Identification
The AC number is used for ordering the Processor Extension Pak (PEP) that 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 PEP provides extra debugging capability not available on the production devices:
- Three addresses or data breakpoints (one address-only breakpoint on production devices).
- Data capture (real-time data streaming).
- No user Flash resources are needed for debugging.
- No user RAM resources are needed for debugging.
- No user pins are 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 Low Dropout (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 datasheet (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 an 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 Dual Inline Packages (DIP) transition sockets or certain Quad Flat No Leads (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 accompanying figure 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 of 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