MCP355XDV-MS1 Microchip Technology, MCP355XDV-MS1 Datasheet - Page 16

• Manufacturer Part Number: MCP355XDV-MS1
• Description: BOARD DEV SENSOR APP MCP355X
• Manufacturer: Microchip Technology

Specifications of MCP355XDV-MS1

• Number Of Adc's: 1
• Number Of Bits: 22
• Data Interface: Serial
• Inputs Per Adc: 1 Differential
• Input Range: ±0.3 V
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Utilized Ic / Part: MCP355x
• Processor To Be Evaluated: MCP355x
• Interface Type: RS-232, USB
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Not applicable / Not applicable

MCP355X Sensor Application Developer’s Board User’s Guide
2.5
DS51609A-page 12
BRIDGE SIMULATOR BOARDS
2.4.2
Channel 2 can also be used to evaluate the MCP355X in a direct-connect sensor
configuration. This is accomplished using the 14-pin dual row header JP2. Changing
the headers to DIRECT+ and DIRECT- will take the signal present on the channel input
header (P7) directly into the MCP355X. Figure 2-6 represents this circuit configuration
using channel 2.
FIGURE 2-6:
There are two small boards included with the MCP355X Sensor Application
Developer’s Board. These boards represent a simulation of an external wheatstone
bridge that is either at zero-scale or full-scale. These boards come populated with
resistors that have a temperature drift specification of 10 ppm/C. For the best bridge
simulation, it is recommended that the bridges be populated with very low drift resistors
with a tempco value of 0.1 ppm/C. Typical load cell bridges will exhibit this output
temperature drift. These boards can be plugged in to either P6 or P7 to assist in
eliminating any error associated with an external sensor. Figure 2-7 represents the
bridge simulator boards and how they should be connected to the MCP355X Sensor
Application Developer’s Board. Refer to Appendix A. “Schematic and Layouts” for
complete schematic.
FIGURE 2-7:
Channel 2 - Direct-Connect Applications (No Amplifier or Gain)
A Direct-connect Weigh Scale.
Bridge Simulator Boards.
Bridge Simulator Boards
R
1
V
V
IN
IN
+
-
MCP3551
V
DD
V
© 2006 Microchip Technology Inc.
V
REF
SS
P6 (
OR
P7)
C
-SENSE
-IN
-OUT
+OUT
+IN
+SENSE
1