User manual

LPC3250 Developer’s Kit v2 - User’s Guide

Page 65

wrong. More symptoms than this is needed to judge if a board is wrong, or not. Do not forget

to press the reset push-button all the time during this measurement. Redo the test in case of

uncertainty.

8. Now, measure the current consumption of the OEM Board when it is running an application. It

is a problem to not have a specified application running because the current consumption can

vary widely between different applications. The current consumption shall increase compared

to the previous test (in case an application is running). By default the LPC3250 OEM Board is

pre-programmed with the S1L bootloader. The consumption for the bootloader is in the range

450-550mV (which corresponds to 90-110mA). The current consumption varies between

different sample applications depending on which peripherals that are active.

9. In most cases it is possible to power the board via the USB interface, J25 (the UART-to-USB

bridge mini-B USB connector). Redo tests 3) to 8) above again with USB powering. Connect

J25 directly to a PC with the USB cable included in the Developer’s Kit.

Note that not all PC:s and/or laptops can power the board. In such cases, a USB hub with

independent powering can work. In this case, connect J25 to a USB Hub, which in turn is

connected to a PC.

7.2 Contact with OEM Board MCU

The second step is to make sure that the LPC3250 MCU on the OEM Board is working.

Test that it is possible to download one of the precompiled test programs that exist on Embedded

Artists support site. Sections 5.4.2 and 5.4.3 describe different ways of downloading applications to the

board.

Optionally test that it is possible to download via the JTAG interface. A JTAG debug interface is then

needed. The low-cost LPCXpresso target board series from NXP contains a JTAG debug interface

called LPC-LINK that can be used for this. Other brands will also work.

7.3 Using Applications to Verify Correct Operation

The third step is to utilize the just downloaded (pre)compiled sample applications, one after one, to

verify correct operation of individual parts of the OEM Board as well as the OEM Base Board. While

doing these tests, be sure to not have anything connected to the system.