48 lines
2 KiB
Text
48 lines
2 KiB
Text
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.
|