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