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|
Header Setup and Operation
Incorrect rotary switch (see "Header Dimensions" figure) settings may irreparably damage the header.
Ensure rotary switch settings are correct (see table below) before powering or connecting the header.
Do not change the rotary switch setting while the header is powered or connected to a debug tool.
Do not power shunt regulator (HV) devices from the debug tool.
Test points are available on this header to check the following: Ground (TP1), Vdd (TP2), ICD Clock (TP3), ICD Data (TP4) and ICD MCLR/Vpp (TP5).
|Switch Position||Device||Switch Position||Device|
|5||Reserved HV||D||Reserved F|
|6||Reserved HV||E||Reserved F|
|7||Reserved HV||F||Reserved F|
Also see the AC162083 Insert (DS51693).
HV device selected instead of F device
If you inadvertently select a shunt regulator (HV) device and attempt to use it in a target board designed for a non-shunt regulator (F) device, the shunt may draw excessive current due to the lack of current-limiting circuitry on the target board and damage the device mounted on the header.
F device selected instead of HV device
If you inadvertently select a non-shunt regulator (F) device and attempt to use it in a target board designed for a shunt regulator (HV) device, the device may draw excessive current due to the higher voltage used on a target board designed for HV devices and damage the device mounted on the header.
HV devices cannot be powered from debug tool
Do not select in MPLAB® X IDE to power the target (debug header) from the debug tool (if it supports powering the target) when using shunt regulator (HV) devices since this will also cause the shunt to draw excessive current.
A damaged header will cause MPLAB® X IDE to report a device ID of 0. However, there are other issues that can cause the device ID to report as 0. Please consult your debug tool documentation on troubleshooting to identify the problem. If you believe you have a damaged header, please contact Microchip technical support at http://support.microchip.com.
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.
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 – AC162083