AN897 Datasheet, PDF (12/16 Pages) Microchip Technology – Thermistor Temperature Sensing with MCP6SX2 PGAs

AN897
An exploded view of how the different boards connect
is shown in Figure A-3.
Thermistor PGA
PICtail™ Daughter Board
Signal Analysis
PICtail™ Daughter Board
USB Cable
Expansion
Header (J3)
PIC16C745 Firmware
Version 2.0.2 or later
FIGURE A-3:
Board Connections.
A.2.1 PC PLATFORM
The Personal Computer (PC) shown in Figure A-2
needs to run on Windows^® 98 SE or later. It provides a
convenient interface for the user, communicates with
the other boards, and provides power through the USB
connection.
A.2.2
PICkit™ 1 SIGNAL ANALYSIS PC
PROGRAM
The PICkit™ 1 Signal Analysis PC Program programs
the PIC16F684 PICmicro^® microcontroller on the
Signal Analysis PICtail Daughter Board through the
USB port on the PICkit 1 Flash Starter Kit. It also
imports data through the same connection and displays
the data in Strip Chart, histogram, FFT plot and
oscilloscope plot formats. Data can be output in CSV
format for importing into a spreadsheet program.
A.2.3 PICkit 1 FLASH STARTER KIT
The PICkit 1 Flash Starter Kit (DV164101) programs
PICmicro microcontrollers. It uses the PIC16C745’s
USB port to communicate with the PICkit 1 Signal
Analysis PC Program. It connects to the Signal
Analysis PICtail Daughter Board via a header (see
Figure A-3).
This board provides a single +5V supply voltage for the
daughter boards. It can drive up to 5 µF on the supply;
a larger capacitance may interfere with program timing.
Remove PICmicro^® MCU from
Evaluation Socket
PICkit™ 1 Flash Starter Kit
A.2.4 PICkit 1 FIRMWARE
This software resides on the PICkit 1 Flash Starter Kit’s
PIC16C745 microcontroller. Use version 2.0.2 or later.
A.2.5
SIGNAL ANALYSIS PICtail
DAUGHTER BOARD
This board is Microchip Development Tool AC164120.
It connects to the PICkit 1 Flash Starter Kit, which it
uses for both power and as a communications link to
the PC. The on-board PIC16F684 has a 10-bit ADC
that converts the Thermistor PGA PICtail Daughter
Board’s output voltage. The results are temporarily
stored on the board’s 25LC640 serial EEPROM chips.
The +5V single-supply voltage from the PICkit 1 Flash
Starter Kit board is bypassed with a bulk 1 µF capacitor
and local 0.1 µF capacitors for each IC.
DS00897B-page 12
 2004 Microchip Technology Inc.