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Power Supply
The target board is powered from the PC USB port, through which winIDEA (IDE) running on a PC, connects to
the on-board integrated debugger. Connection is made using a standard USB cable. Battery power supply for
RTC can be optionally connected to J11 (see J11 description for more details).
Jumper & Connector Descriptions
•
J7: Trace Port Enable: J7 is set to enable pins P1.25:16 to operate as ETM Trace port after reset.
Default not set.
•
J8: Debug Port Enable: J8 is set to enable pins P1.31:26 to operate as a JTAG Debug port after reset.
Default is set.
•
J9: Debug Mode: J9 selects whether iSYSTEM on-board integrated USB-JTAG debugger is used or an
external debug tool. Default set in position 1-2.*
•
J10: RTC Power Supply Selector: J10 connects Vbat pin of LPC2138 to the main 3.3V.
•
J11: RTC Power supply: PCB terminal providing connection for battery. When battery power supply
applied to J11 is used, J10 must be open.
•
J12: Manufacturing purpose connections
•
J13: Analog Output: J13 is analog output from OP amplifier, which connects to output of the DA
converter.
•
J14: Serial Port (UART 0): three pins connected to UART0. See connectors for more details.
•
J15: User LEDs Enable: enables the LED driver connecting the on-board LEDs to GPIO P0.8 – P0.11.
•
J16: User Buttons Enable: enables buttons driver connecting the on-board buttons to GPIO P0.12 –
P0.15. Pushing the button generates a low signal. If J16 is set, the CPU will not start in Boot-loader
mode (see J25 description).
•
J17: LCD Enable Signal: connects GPIO P0.21 to the LCD enable pin.
•
J18: LCD R/W Signal: connects GPIO P0.22 to the LCD R/W pin.
•
J19: Analog Output Enable: connects DA converter output (GPIO P0.25) to the OP amplifier.
•
J20: Analog Input Enable: connects the TRIM potentiometer to the analog input AD0.0 (GPIO
P0.27).
•
J21: 16 Pin LCD Connector: see connectors
•
J22: LCD LED Backlight Enable: J22 is set to turn on LCD backlight.
•
J25: Startup mode (populated on the bottom side of the target board): J25 connects either a pull-up
(USER mode) or a pull-down (BOOT-loader mode) to P0.14. Default set in position USER (User
mode). J16 must be removed when setting J25 in position BOOT, otherwise J25 setting is not effective.
*Jumper pin 1 is marked with a white square on the ITLPC2138 PCB. If pin 1 cannot be located directly from
the ITLPC2138, please use Figure 2 for assistance.
Note: Don't change jumper settings while the target board is supplied with power!
© iSYSTEM, December 2005
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