MCP3421DM-WS Microchip Technology, MCP3421DM-WS Datasheet - Page 16

• Manufacturer Part Number: MCP3421DM-WS
• Description: Data Conversion IC Development Tools WT SCALE DEMO BRD 18 I/O 10-BIT ADC
• Manufacturer: Microchip Technology
• Type: ADCr

Specifications of MCP3421DM-WS

• Product: Demonstration Boards
• Tool Is For Evaluation Of: MCP3421
• Interface Type: I2C
• Operating Supply Voltage: 5 V

3.3
FIGURE 3-2:
DS51918A-page 16
WEIGHT SCALE CALIBRATION
The MCP3421 Weight Scale Demo Board requires a two points calibration: one at 0g,
to remove the weight scale offset, and another at a known point, for gain calibration.
To perform the complete weight scale calibration the user must follow the next steps:
1. Connect the weight scale to the PC and run the software.
2. Press S3 button to select the desired option (xPGA, xGLo or xGHi).
3. Press S4 to remove the offset. The weight indication does not reach 0 in all
4. Place a known weight on the scale’s platform.
5. Write the weight value in the “Calibration Weight (g)” field on the GUI.
6. Press Calibrate button from the GUI, or F4 on the keyboard. This last step will
The offset calibration may be required more often than the gain calibration, for precision
reasons. Once the complete weight scale calibration done, the offset calibration can be
performed at any time, by pressing S4.
It is important to perform complete calibrations for all six signal conditioning options.
The calibration constants are being stored in the MCU EEPROM.
MCP3421 Weight Scale Demo Board Software – Calibration mode.
cases. This is a normal behavior, since calibration is not completed at this step.
perform the gain calibration.
 2010 Microchip Technology Inc.