This version is outdated by a newer approved version.
This version (22 Sep 2016 20:45) is a draft.
Approvals: 0/1The Previously approved version (20 Sep 2016 17:18) is available.
This version (22 Sep 2016 20:45) is a draft.Approvals: 0/1The Previously approved version (20 Sep 2016 17:18) is available.
This is an old revision of the document!
Table of Contents
EVAL-CN0216-ARDZ Shield
CN-0216 is a precision weigh scale signal conditioning system. It uses the AD7791, a low power buffered 24-bit sigma-delta ADC along with dual external ADA4528-2 zero-drift amplifiers. This solution allows for high dc gain with a single supply.
Ultralow noise, low offset voltage, and low drift amplifiers are used at the front end for amplification of the low-level signal from the load cell. The circuit yields 15.3 bit noise-free code resolution for a load cell with a full-scale output of 10 mV.
This circuit allows great flexibility in designing a custom low-level signal conditioning front end that gives the user the ability to easily optimize the overall transfer function of the combined sensor-amplifier-converter circuit. The AD7791 maintains good performance over the complete output data range, from 9.5 Hz to 120 Hz, which allows it to be used in weigh scale applications that operate at various low speeds.
Extremely important to note that the EVAL-CN0216-ARDZ is powered from the VIN connector on the Arduino Uno header. This is because the bridge drive voltage of the EVAL-CN0216-ARDZ requires more than 5V to power the bridge. Therefore it is required to supply power from the baseboard through the DC power connector in order for proper functionality. The board will not work properly if you try only to power it from the USB.
Connectors and Jumper Configurations
PICTURE OF THE BOARD FILE with JUMPERS AND CONNECTORS HIGHLIGHTED
Sensor Connector
| Pin Number | Pin Function |
|---|---|
| Pin 1 | Not Used |
| Pin 2 | - Excitation |
| Pin 3 | + Signal |
| Pin 4 | - Sense |
| Pin 5 | + Sense |
| Pin 6 | - Signal |
| Pin 7 | + Excitation |
| Pin 8 | Not Used |
Bridge Configuration
NOTE - Any 4 or 6 wire load cells can be used with the EVAL-CN0216-ARDZ.
The Tedeah Huntleigh Model 1042 load cell was used during testing.
Position “0” (shown below) is used for 6-wire resistive bridges
- P2 - Connects REFIN+ to Sensor +Sense pin
- P3 - Connects REFIN- to Sensor -Sense pin
Position “1” is used for 4-wire resistive bridges
- P2 - Connects REFIN+ to 5V supply
- P3 - Connects REFIN- to GND
MISSING position 0 for 6-wire bridges
Chip Select
NEED CHIP select picture of header!!!
| AD7791_CS Pins (P??) | Arduino GPIO Pin (P??) |
|---|---|
| Pin 1 shunted to Pin 2 | GPIO 8 |
| Pin 3 shunted to Pin 4 | GPIO 9 |
| Pin 5 shunted to Pin 6 | GPIO 10 |
Schematic, Bill of Materials, Gerber Files, Layout Files
EVAL-CN0216-ARDZ Rev C Files
EVAL-CN0216-ARDZ Rev B Files
EVAL-CN0216-ARDZ REV A Files
- Does this even exist? or was Rev A the prototype???
Change Log
RevB to RevC:
- U1 (from MCCOG128064A6S-SPTLY to BTHQ128064AVC1-COG-STF-LED)
- C32 (from 330n to NP)
- Software (conductivity result reliability routines removed)
- Software (setup and hold time setting added)
- Software (RS-485 communication routines added)
RevA to RevB: (again assuming we had a rev A)
- U1 (from MCCOG128064A6S-SPTLY to BTHQ128064AVC1-COG-STF-LED)
- C32 (from 330n to NP)
- Software (conductivity result reliability routines removed)
- Software (setup and hold time setting added)
- Software (RS-485 communication routines added)
Software
resources/eval/user-guides/eval-adicup360/hardware/cn0216.1474569907.txt.gz · Last modified: 22 Sep 2016 20:45 by Brandon Bushey