I2C Interface; Uln2003 - NEX ROBOTICS LPC2148 Pro Manual

header contains 4 signals related to SPI0. The jumper positions and associated pins for
SPI-SD/MMC interface are shown in the above figure. To use SPI0 for the external
interfacing, remove these jumpers. The SPI0 pin conventions on the expansion header are
with respect to master i.e. LPC2148 microcontroller.
3.10

I2C INTERFACE

The I2C0 peripheral on LPC2148 development board is used for interfacing 24LCxxx
EEPROM memories from microchip. The above figure describes the jumper positions
and pins used for I2C interface.
3.11

ULN2003

Fig.3.3 Logic Header
The LPC2148 development board features a high current ULN2003 driver. It has 7
darlington transistor array. Each transistor can sink current up to 500mA. This device is
useful for driving a wide range of loads including solenoids, relays, DC motors, LED
displays filament lamps, thermal print heads and high power buffers etc. For more
information on ULN2003 refer to data sheet included in the CD. Fig.3.3 describes the
jumper positions for logic inputs to the ULN2003 driver. To use any channel insert a
jumper in its respective position. Fig.3.4 describes the expansion header for connecting
relays, stepper motors, LEDs or any inductive load. Logic '1' on input channel will drive
the load connected to the corresponding channel. The application circuit used in the
experiment is shown in the figure below.
The cathode of LED is connected to the pin named as '1' on Driver header and I/O pin
connected is connected to pin named as '1' on Logic header by placing a jumper in its
position.
NEX Robotics Pvt. Ltd.
www.nex-robotics.com
LPC2148 DEVELOPMENT BOARD
Fig.3.4 Driver header
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