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Jim Granville
06/10/13 19:33
  06/10/13 19:34

Read: 1007 times

#189914 - More idle tests
Responding to: Mikkel C. Simonsen's previous message
Mikkel C. Simonsen said:

The should do nothing except start the timer, and enter idle mode. Using this code, I get 2.53mA with the ceramic resonator, and 2.41mA with the internal clock. With no µC installed, the consumption (voltage regulator) is 0.21mA.

The 8MHz/internal clock consumption matches the datasheet just fine, but does the crystal oscillator really "steal" this much power?

... buy a better regulator ?

Add a jumper to the XTALin, and when it hits IDLE, add jumper to pull the Crystal H or L.
That will remove the linear amplifier current, and some small clocking current.
If that drops significantly, then drive the Xtalin from an external Clock,
(full CMOS swing!) and check IDLE Idd on uC.
Also check full power down, just to verify your test setup.

If external CLK drops Idd a lot, then the OscAmplifer is the problem area.
There are things you can do, to lower Osc Current

Mikkel C. Simonsen said:

Zilog Z51F0410 is close. Wide Vcc, and SSOP10 1mm lead pitch. (SO8 size)

Looks about right.

See also the Z51F0811 data as it has more typical values.

Looks like the "big one" uses less power at 12MHz than the Atmel does at 8, so the 0410 should be a good option.

But how do you program them? I looked around the Zilog website, but didn't find a programming app. Looking at the demo board schematics, it looks like you need TXD and RXD only, so the hardware part should be easy (a MAX232?).

The Z51F is a 2-clock core, so pure MHz is not quite ==
The Z51F0410000KITG, includes the Debug and Programming, done over 2 pins.

The 5V C8051F5xx would also work, if you can find a package you can tolerate, why not get both, and try them ?

ToolSticks from SiLabs, and Z51F0410000KITG are cheap.

When chasing lowest Icc, the data sheets often do not tell the whole story.

List of 44 messages in thread
Low-power MCU needed      Mikkel C. Simonsen      06/09/13 13:58      
   OK, but wrong      Erik Malund      06/09/13 15:33      
      Wrong how?      Mikkel C. Simonsen      06/09/13 16:30      
         Silabs options      Jim Granville      06/09/13 16:53      
            C8051F99x      Maarten Brock      06/10/13 13:06      
               Silabs      Mikkel C. Simonsen      06/10/13 17:17      
                  look it up      Erik Malund      06/10/13 19:28      
                     Looked up      Mikkel C. Simonsen      06/11/13 16:26      
                        f53, no      Erik Malund      06/11/13 17:37      
                        C8051F537A is OK      Jim Granville      06/11/13 19:31      
         the current in active mode is not the issue      Erik Malund      06/10/13 05:30      
            Inactive current      Mikkel C. Simonsen      06/10/13 16:41      
         re: wrong      Jacob Boyce      06/10/13 06:56      
            Consumers      Mikkel C. Simonsen      06/10/13 09:54      
   Zilog Z51F0410       Jim Granville      06/09/13 16:46      
      Zilog      Mikkel C. Simonsen      06/10/13 17:01      
   Check you are entering idle ?      Jim Granville      06/09/13 16:48      
   idle current      Jan Waclawek      06/09/13 22:27      
      Idle test      Mikkel C. Simonsen      06/10/13 10:57      
         re:      Jacob Boyce      06/10/13 13:10      
            It floats! It floats!      Mikkel C. Simonsen      06/10/13 14:18      
               re:floats      Jacob Boyce      06/10/13 14:52      
               re:floats      Jacob Boyce      06/10/13 15:10      
                  Timers      Mikkel C. Simonsen      06/10/13 15:27      
         More idle tests      Jim Granville      06/10/13 19:33      
            Better regulator?      Mikkel C. Simonsen      06/11/13 18:19      
               LR8K4 450V regulator       Jim Granville      06/11/13 19:53      
         also try CLKREG      Jim Granville      06/10/13 19:47      
            Clk Dividers are a good idea      Jim Granville      06/11/13 01:03      
               No dividers      Mikkel C. Simonsen      06/11/13 18:11      
                  LP52 is cheaper too...      Jim Granville      06/11/13 20:04      
                     LP52      Mikkel C. Simonsen      06/17/13 20:24      
                        No GND pin?      Maarten Brock      06/18/13 11:34      
         re:idle      Jacob Boyce      06/11/13 13:30      
         Totally idle      Mikkel C. Simonsen      06/11/13 16:22      
            Checks      Jim Granville      06/11/13 16:33      
               More checks      Mikkel C. Simonsen      06/11/13 18:00      
                  Power Down ?      Jim Granville      06/11/13 18:59      
                  test setup      Jacob Boyce      06/12/13 08:33      
   STC      Mikkel C. Simonsen      08/17/13 18:22      
      C8051F86x/85x ?      Jim Granville      08/17/13 23:32      
      Maybe not such a good choice, after all?      Andy Neil      08/28/13 14:21      
         Support?      Mikkel C. Simonsen      08/28/13 14:31      
            '51 support      Erik Malund      08/28/13 15:49      

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