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-HHKB Power consumption
-----------------------
-
-**Power consumption
- board clock/prescaler keyswitch power ctrl current
- --------------------------------------------------------------------------
- tmk 16MHz no no 26.4mA
- tmk 16MHz pro1 no 45.1mA
- tmk 16MHz/2 no no 18.1mA
- tmk 16MHz/2 pro1 no 37.3mA
- tmk 8MHz no no 18.9mA
- tmk 8MHz pro2 no(w/o FET) 32.1mA
- tmk 8MHz pro2 no(w FET) 32.1mA withou POWER_ON/FF
- tmk 8MHz pro2 no(w FET) 32.6mA with POWR_ON/OFF
- tmk 8MHz pro2 15ms(w FET) 21.3mA with POWR_ON/OFF, enumerated but error -32
- tmk 8MHz pro2 60ms(w FET) 13.3mA with POWR_ON/OFF, not enumerated
-
- gh60 16MHz 25.8mA
- gh60 16MHz USB suspend w LED breathing 17.6-29.1mA
- gh60 16MHz USB suspend w/o LED 0.2mA(0.231-0.276mA)
- Poker 5.6mA
- Poker USB suspend 0.3mA(0.301mA)
- gh60 16MHz stock firmware by komar 26.8mA
-
-
- HHKB pro2 Over All 139.4mA
- HHKB pro2 Controller 115.1mA
- HHKB pro1 Controller 25.9mA
-
-
-keyswitch power consumption:
-pro1: 45.1-26.4=18.7mA
- 37.3-18.1=19.2mA
-pro2: 32.1-18.9=13.2mA
-
-
-
-
-
-**Low Freq Crystal or Prescaler?
-No advantage of Low Freq Crystal against Prescaled.
-
-Clock routing
-X'tal --+---->Prescaler-------> System Clock
- |
- +---------------------> USB PLL
-
-Design Decision: Install 16MHz crystal on board with using clock rescaler.