diff options
Diffstat (limited to 'keyboard/hhkb/doc/Power.txt')
| -rw-r--r-- | keyboard/hhkb/doc/Power.txt | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/keyboard/hhkb/doc/Power.txt b/keyboard/hhkb/doc/Power.txt new file mode 100644 index 000000000..1287053c3 --- /dev/null +++ b/keyboard/hhkb/doc/Power.txt @@ -0,0 +1,48 @@ +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. |