Embedded Artists Low-power Application Kit (Oryx) EA-APP-002 EA-APP-002 Datenbogen

Low-power Application Kit (Oryx) - User’s Guide 

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Copyright 2012 © Embedded Artists AB 

 

This chapter contains information about how to troubleshoot boards that does not seem to operate 

properly. It is strongly advised to read through the list of tests and actions that can be done before 

contacting Arrow. The different tests can help determine if there is a problem with the board, or not. 

For return policy, please read Embedded Artists’ General Terms & Conditions document. This 

document can be found on the Embedded Artists’ web site. 

6.1.1  

Cannot download/debug 

Symptom: Cannot contact the board via SWD after experimenting with low power modes 
Cause: An erroneous application program can disable the SWD interface and/or program the internal 

clocks in the wrong way so that it is impossible to download a new application to the board. The 

erroneous application program starts executing after a reset and initializes the LPC11U37 in the wrong 

way before an external debugger can get control over the processor. 
Solution: Press the ‘ISP enable’ push-button while resetting the board (pressing the reset push-button). 
This way the ‘known good’ internal bootloader starts executing. From this state, it is possible for an 

external debugger to get control over the processor and download a new application program. 

6.1.2  

Battery drain quickly 

Symptom: The Lithium battery drains quickly and only lasts for an hour, or so. 
Cause: The capacity of the Lithium battery is only 45 mAh. The application program must be created 

with low-power consumption principles. If the LPC11U37 execute at full speed (with entering any low 

power mode) the current consumption can be up to 20 mA. The battery will then only last for about 2-3 
hours. 
The demo application showcases low-power design principles for how to create the software. 

6.1.3  

Verify operation of board 

Symptom: The board does not seem to operate properly. 
Solution: Perform a complete verification of the board. 
The first step is to make sure that powering works properly. Make sure that all jumpers are in their 
default position, see Figure 12 for details. 
Connect a USB cable to J9 (other end in a powered PC). TP6 is a ground position (lower left corner of 

board). Measure voltage between TP6 and JP2, pin 1 or pin 2. Jumper should not be removed. It is 

possible to measure on the pins while a jumper is still inserted. The voltage shall be between 4.5 and 

5.5V. 
Measure voltage between TP6 and the top side of Lithium battery. The voltage shall be abound 4.2V. 

This indicated that the Lithium battery is being charged correctly. 
Measure voltage between TP6 and TP4. The voltage shall be above 3.1V, typically 4.2V. 
Then measure voltage between TP6 and JP3, pin 1 or pin 2. The voltage shall be between 2.9 and 

3.1V.  This indicates that all components in the design are powered correctly (with a 3.0V supply). 
The second step is to download the production test application into the board. See section 4.4 for 
details how to download an application. The production test application gives instructions what to do 

and there are three user interactions: 

1.  Turn the trimming potentiometer to min and max position. 
2.  Touch all capacitive sensors, one after another. 
3.  Press the Wakeup and ISP push-buttons.