8-bit Microcontrollers中的主题 Re: MC13213: high current in stop mode 3, why?

MC13213: high current in stop mode 3, why?

Alex_RUS — Tue, 26 Sep 2006 20:37:45 GMT

I am using smac 4.2 library. I am trying to put microcontroller to stop mode 3 using this code:
   SRTISC=0x00; /* Disable wake up timer. */
   SPMSC1=0x00;
   SPMSC2=0x00; /* Enable deep sleep mode stop3. */
   MCUInit();
   RadioInit();
   MC13192ContReset();
   ICGC1 &= ~((1<<2)|(1<<1));// disable osc.
   _asm stop
After that code i see that consuption current becomes equal 4-6mA - that is too big.

stop 1 adn stop 2 modes works fine.
The electrical circute is very simpe (see attachment)
Why so? please help.

Re: MC13213: high current in stop mode 3, why?

RockyRoad — Wed, 27 Sep 2006 21:35:11 GMT

Alex -

Your schematic shows many unconnected IO pins. Do you initialize these pins in your software? The default/reset state is that they are inputs without pullups. If they are left this way, the inputs will float to a level that causes the input buffers to draw current. With the number of unconnected IO pins in your schematic, this could easily add up to the 4-6mA that you are seeing.

The easiest way to fix this is to initialize all these pins either as inputs with the internal pullups enabled or as outputs.

- Rocky

Re: MC13213: high current in stop mode 3, why?

Alex_RUS — Thu, 28 Sep 2006 17:10:06 GMT

Thank you very match!

I achived ~8uA~ Should I put GPIO1-GPIO7 to GND too? As far as I understand (from AN2493D) the minimum current is 1.1uA. Is this value possible whith working KBI interrupt?

Re: MC13213: high current in stop mode 3, why?

kbu — Fri, 29 Sep 2006 03:04:54 GMT

Hi Alex-RUS.

I had a question about your schematics.

where do you connect your antenna, is looks like you probably use the 0 ohm resistor pads for your antenna (chip antenna)? is that correct?
Also how come the other side is grounded? which chip antenna are you using?

Thanks

Re: MC13213: high current in stop mode 3, why?

Alex_RUS — Thu, 09 Nov 2006 17:58:19 GMT

This 0 Ohm is just for testing.. I use pcb antenna on this board

Re: MC13213: high current in stop mode 3, why?

allenrubis — Fri, 19 Jan 2007 15:35:41 GMT

Hi,
Im allen rubis, could i borrow ur script in doing the stop3 mode. in measuring sleeo mode current.
Allen Rubis

Re: MC13213: high current in stop mode 3, why?

Alex_RUS — Fri, 19 Jan 2007 16:48:40 GMT

Do you want to see C-code?

Re: MC13213: high current in stop mode 3, why?

Arcie — Sat, 10 Nov 2007 02:26:43 GMT

It could be a nice idea!! for the MCUInit(), for example...

ok, I'll try to use your advices