AN957 Datasheet, PDF (22/25 Pages) List of Unclassifed Manufacturers – Measuring HEXFETCharacteristics

AN957: TouchXpress™ Configuration and Profiling Guide
Example Development Workflow
4.3 Step 3 — Measuring Current
The TouchXpress evaluation boards offer an in-series via pair that can be tapped into with a current meter to evaluate average current
draw. Removing the zero ohm resistor near the via pair will open the circuit, enabling the current meter to measure all current that the
device is using.
Figure 4.4. Measuring Current Draw on a TouchXpress Evaluation Board
Note that, while the [Capacitive Sense Profiler] is minimally intrusive, it will lower active mode scan time due to the periodic reads of
run-time data. During these reads, the device will be in a relatively high ( > 3 mA) current draw state, and a single read can take as long
as 50-100 ms. For this reason, current evaluation should be made when the TouchXpress device is not connected to [Capacitive
Sense Profiler] and streaming data on-screen.
The recommendations for improving current draw in this document should be used as a guide to tweak scan times and settings to ach-
ieve the desired average current draw.
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