1. In-System Programming

In-system programming involves programming devices after installation in the end system, as in the case of the Capacitive Sense Eval-

uation Boards. In this scenario, access to the config pins (Config Clk or Config Data) is provided in the end system to enable connection

to a programming master. This programming master can be a Silicon Labs USB Debug Adapter (UDA) or a ToolStick Base Adapter.

The 8-bit USB Debug Adapter (DEBUGADPTR1-USB, available here: https://www.silabs.com/products/mcu/Pages/USBDebug.aspx) or

the ToolStick Debug Adapter (available at http://www.silabs.com/toolstick) can be used to program TouchXpress devices. These adapt-

ers provide a 2 x 5 0.1" header that can be connected to the custom PCB to program the TouchXpress device. If this header is too large

for the application system, three test points can be located on the edge of the PCB for use with an adapter cable.

USB

Debug

Adapter

ToolStick Debug Adapter

Figure 1.1. USB Debug Adapter and ToolStick Debug Adapter

The required connections to program a TouchXpress device with the USB Debug Adpater or ToolStick Debug Adapter are:

Table 1.1. Required Connections for USB Debug Adapter or ToolStick Debug Adapter Programming

TouchXpress Device Pin

USB Debug Adapter or ToolStick Debug Adapter Pin

Config Clk

TDI / C2CK (pin 7)

Config Data

TCK / C2D (pin 4)

GND

GND (Ground) (pins 2, 3, or 9)

More information on the USB Debug Adapter can be found in the USB Debug Adapter User Guide, which is available from the page

linked above. More information about the ToolStick Debug Adapter can be found in the ToolStick Debug Adapter User Guide, which is

linked on the ToolStick website (http://www.silabs.com/toolstick).

AN949: TouchXpress™ Programming Guide

In-System Programming

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