BF706 Power consumption

Discussion created by Sri@ecil on May 13, 2016
Latest reply on May 19, 2016 by Sri@ecil


We have developed a hardware consisting of BF706 as the main controller. I am facing power issues with this. It is drawing more current. I am using only the SPORT of BG706 which is configured to operate with external clock and in TDMA mode. The external clock is 1MHz. Our application is running successfully on this h/w, but its drawing more current.


My observations:

  1. When the hardware is powered on (No code present in the flash. BF706 configured to boot from external flash) with regulated DC input of 7.5 V, the current drawn by the h/w is around 30mA.
  2. When I connect my JTAG emulator to this hardware, the current increased to around 100mA. Is it OK??
  3. When I run my code in emulator mode with out any traffic at the SPORT, the current drawn is around 120 mA.
  4. In the above condition with traffic, current drawn is around 140mA.

My querries:

  • Why is the current drawn in emulator more is more...??
  • I need to reduce the current drawn by the h/w. What options do I have...?
  • In actual application, the SPORT traffic is always present, so I cant use the processor sleep mode or hybernate mode.
  • All the peripherals except for the SPORT are disabled. Then why my h/w is drawing more current. Is there any thing to be done with the un-used pins from h/w point of view...?

Thanks and Regards,