User manual

MCP355X Sensor Application Developer’s Board User’s Guide

3.2.2 Controlling the LCD Menu

The right most button F3 is the menu control button.

FIGURE 3-1: LCD showing the Averaging Menu. Also shown are the F1, F2

and F3 buttons.

Pressing this button will cycle through the menu options and change the functionality

of the other two buttons, F1 and F2. The LCD text above the buttons describes the

functionality for the different menus.

Here are the LCD menus that can be selected using the F3 button:

• Zero Calibrate - Enable/Disable/Hold

• Channel Select

•Units

• Averaging

• Full-Scale Value Selection

• Full-Scale Calibration

There are four different menu options that will be described in individual sections.

3.2.2.1 ZERO CALIBRATE

When in this menu, the first button becomes the ZERO button. When this button is

selected, the most recent ADC value after averaging will be loaded into the ZERO

CAL

Zero calibration is also enabled or disabled by pressing the ZERO button. This is

indicated by a change of the spinning character on the far top-right of the display, (i.e.:

a LINE is inserted under the spinning character when zero calibration is turned ON.)

When enabled, ZERO

CAL

is subtracted as per Equation 3-1. Refer to Figure 3-2.

FIGURE 3-2: These two icons show the presence of the zero offset

substraction in the calculation. The icon on the right has a bar underneath that

represents when zero subtraction is enabled.