LPC11E68 IRC not stopped during power down

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by LpcWare159 on Thu Dec 11 03:21:18 MST 2014

I have a board with the LPC11E68. The firmware makes the MCU sleep for 4 seconds, wakes up via RTC interrupt, blinks a LED and goes to sleep again. All IOs as output and driven low, pullup/down disabled. The power consumption in deep power down is about 10uA (LDO quiescence + MCU). But when I put the part in power down it won't get below 400uA. I configured the CLKOUT to output the main clock. to During the wake up period, the CLKOUT shows the 12MHz IRC clock coming out. When it enters power down, I see every 100us a burst of thirteen 12MHz cycles (burst appr 1.1us long) coming out of CLKOUT? Isn't the IRC shutdown automatically when entering power down?

Does anyone have this part with power down consumption around datasheet level (22uA)?

Thanks for feedback