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PICkit? Serial I 2 C? Demo Board User’s Guide
2.2
DEVICES
2.2.1
24LC02B 2Kbit Serial EEPROM
The 24LC02B is a 2Kbit Serial EEPROM. Refer to the 24AA02/24LC02B Data Sheet
(DS21709) for complete information. The slave address is 0xAX (where x = any value).
Data can be read or written to the 24LC02B.
2.2.2
MCP9801 High-Accuracy Temperature Sensor
The MCP9801 is a High-Accuracy Temperature Sensor. Refer to the
MCP9800/MCP9801 Data Sheet (DS21909) for complete information. The slave
address is 0x92.
The temperature can be read from the MCP9801. Test points ALERT and GND provide
signals that can be read using a voltmeter or oscilloscope.
2.2.3
MCP3221 Low-Power 12-Bit A/D Converter
The MCP3221 is a Low Power 12-Bit A/D Converter. Refer to the MCP3221 Data Sheet
(DS21732) for complete information. The slave address is 0x9A.
Potentiometer R1 is configured as a voltage divider (see schematic in Appendix
A. “Schematic and Layouts” ). The wiper is connected to the input. The voltage can
be read by the MCP3221 and can be verified using an volt meter on test points A IN and
GND .
2.2.4
TC1321 10-Bit Digital-to-Analog Converter
The TC1321 is a 10-Bit Digital-to-Analog Converter. Refer to the TC1321 Data Sheet
(DS21387) for complete information. The slave address is 0x90.
The V REF signal is generated by a MCP1525 2.5 Voltage Reference. The DAC output
voltage swing (V SW ) will be between 0 - 2.5V.
The output of the TC1321 can be measured using a volt meter at test points V OUT ,
DAC-OUT , and GND .
2.2.5
MCP23008 8-Bit I/O Expander
The MCP23008 is an 8-bit I/O Expander. Refer to the MCP23008/MCP23S08 Data
Sheet (DS21919) for complete information. The slave address is 0x40.
The output of the MCP23008 drives LEDs DS1 through DS8 . The LEDs provide an
easy to see indication of the MCP23008 operation. Jumper JP1 must be closed using
a 2-pin shunt for the LEDs to operate. The LEDs can be disabled by removing JP1 .
The output of the MCP23008 is connected to test points GP0 through GP7 and GND .
These test points can be monitored by a volt meter or connected to an external device.
LEDs DS1 through DS8 can be used to monitor the output by closing JP1 with a 2-pin
shunt or disable by removing JP1 .
DS51657A-page 8
? 2007 Microchip Technology Inc.
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