----------     PAN-90: ----------

v01 -  ( ).
v02 -     .
v03 -  ,   ,
          ,
        .
v03_enc -   ,   
v04 -   ,  
          .
          
      R27, R28    90.
        
         .
          R29, 
       R9   VT1VT3  BC847C.
          R30,
       R31   VT1VT3  BC857C.

-  ATmega88,     .
+   ATmega168.

-      , 
    .     
   PC,      .
+      solder.

-   ,   
     .
+    ,  
  .

?       
   ?       SMD?
+    PW-2   comp,  
      comp.

!  ,     .
+    .

!  TL431   TO-92.
=  .

!       LUT, 
     4- .
=  .

?      RS/USB.
  , : VCC, GND, RXD, TXD, DIR.
      VCC, GND  ,
  GND, RXD  , GND, RXD, TXD  
  , VCC, GND, RXD, TXD    
   ,    -  RS-485.
+   DIR,    4 .

+    AVDD   0805 0 .

+   150 .

!      
    BC857C.
+   BC847C.

!     ,  
    .
+    2,   REED  
  ADC7,   PD7    .
   -      .
+    3,    
     , 
    -   
  ,    .  
     .   
      .    ,
     -    
    .

+      1 .
         1.8 .

+     XCMT12A2405PX.
     .  
    33 .

+      
    PBS.    .

-       DFS-90!
      .
+ .

+    04     0805
      (  
    -).

---------------------  : ---------------------

!   :   
   ,   
      .  -  
    ,     .
+  ,     .
=     , .
