MCP355XDM-TAS Microchip Technology, MCP355XDM-TAS Datasheet - Page 15

• Manufacturer Part Number: MCP355XDM-TAS
• Description: BOARD DEMO TINY APP SNSR MCP355X
• Manufacturer: Microchip Technology

Specifications of MCP355XDM-TAS

• Number Of Adc's: 1
• Number Of Bits: 22
• Data Interface: Serial
• Inputs Per Adc: 1 Single Ended
• Input Range: ±3 V
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Utilized Ic / Part: MCP355x
• Processor To Be Evaluated: MCP355x
• Interface Type: USB
• Silicon Manufacturer: Microchip
• Silicon Core Number: MCP3551, MCP3553, MCP3550-50, MCP3550-60
• Kit Application Type: Data Converter
• Application Sub Type: ADC
• Kit Contents: Board Cable Docs
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Not applicable / Not applicable

© 2006 Microchip Technology Inc.
FIGURE 2-4:
2.4.6
The Sample Rate demo uses a combination of polling and time to sample the input
signal. When the Play button in the software is pressed, the PIC18F4550 samples the
Ready state of the MCP3551 every 10 ms by lowering CS and sampling the SDO/RDY
pin. If the device is ready (i.e., the conversion is complete), the data is clocked out.
Otherwise, CS is raised.
Since the conversion time of the MCP3551 is ~72 ms and the Ready state is sampled
at ~10 ms intervals, the data is available to the PC approximately every 72 ms, ±10 ms.
However, the USB host queries the board for data every 10 ms. This implies that the
minimum sample rate for the software (see Section 2.4.5.4 “Configuration Window”
for details on setting the sample rate) should be > 92 ms (or ~100 ms). If the DataView
software is set to a shorter sample rate, data will be repeated and the software will not
reflect the true operation of the device.
See the MCP3550/1/3 Data Sheet (DS21950) for more details on conversion time and
Single Conversion mode.
Note:
MCP3551 Sample Rate Demo
Once data is read out and CS is toggled for the first time, the device is
placed in Single Conversion mode.
Auxilary Data Window.
DS51579C-page 11