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Mikkel C. Simonsen
06/09/13 16:30
Read: 1037 times

#189893 - Wrong how?
Responding to: Erik Malund's previous message
Erik Malund said:
OK, but wrong. Time must be included in the calculation. E.g. a chip that runs twice as fast will allow twice the active mode current.

Yes, but in this case I looked at the graphs in the datasheet. They list Icc at frequencies from 1 to 24MHz. At 2MHz the numbers are 0.6mA (idle) and 2.7mA (active), so I expected the actual current to be somewhere between the two. Where did I go wrong there?

Why? 3V3 chips also have TTL output levels.

Yes, but getting 5V from a 3V3 device is hard. I'm not driving a TTL input, but actually need 5V. But it looks like some Silabs devices run on 2.x volts internally, and can still do 5V I/O.

IAP/JTAG seems a better solution

Yes, if there's space. The common 10-pin headers are a no-go - there simply isn't that much space available. The devices that only need two pins for programming would be OK.

The reason I chose DIL, is also assembly time. Soldering in a DIL device is a lot faster than the SMD devices (for me). A SOIC is not much worse, but anything smaller takes too long (when you may have a 100 boards to assemble).

I have done a search for Silabs devices at the Mouser site, and it looks like 5V and SOIC are mutually exclusive options. But I may have overlooked something.

I failed to mention in my first post, that my aim is less than 2mA. So I'm close already, but not close enough.


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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