FreeCalypso > hg > freecalypso-schem2
annotate venus/src/pinouts/74LVC541A.pinout @ 70:8bc2aa52fd23
manual RESET button new part: 260 g force, shorter actuator
One of the main envisioned use cases for FC Venus is field demonstration:
the board will be carried around, mounted on a sheet of acrylic or somesuch,
it will have a battery and an antenna connected, there will be a test SIM
with active service inserted, and the setup will be ready to demonstrate
as a working phone at a moment's notice. But when a demo is not actively
in progress, the fully assembled setup will be transported around in a big
and loose ESD bag, and it will need to be equivalent to a traditional phone
in its switched-off state: battery present, RTC keeping time, but not
switched on all the time.
Having a RESET button of the same keyswitch type as used for the regular
keypad and PWON would cause a problem for such field transport scenarios:
any spurious press of this button would cause a "misc boot" switch-on.
Short spurious presses of PWON are filtered out by the firmware (automatic
power-off if the button isn't held down long enough), but the same cannot
be done for super-low-level nTESTRESET. However, a button with significantly
greater operating force and a shorter actuator (not sticking out to the same
height as the regular keypad buttons) should be much safer.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 02 Dec 2021 22:40:39 +0000 |
parents | 975b9b7ec712 |
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rev | line source |
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Venus MCL: add 74LVC125A for Calypso UART inputs
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parents:
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1 #pin name pin number |
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parents:
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2 nOE1 1 |
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parents:
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3 A:0 2 |
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parents:
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4 A:1 3 |
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parents:
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5 A:2 4 |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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6 A:3 5 |
975b9b7ec712
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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7 A:4 6 |
975b9b7ec712
Venus MCL: add 74LVC125A for Calypso UART inputs
Mychaela Falconia <falcon@freecalypso.org>
parents:
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8 A:5 7 |
975b9b7ec712
Venus MCL: add 74LVC125A for Calypso UART inputs
Mychaela Falconia <falcon@freecalypso.org>
parents:
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9 A:6 8 |
975b9b7ec712
Venus MCL: add 74LVC125A for Calypso UART inputs
Mychaela Falconia <falcon@freecalypso.org>
parents:
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10 A:7 9 |
975b9b7ec712
Venus MCL: add 74LVC125A for Calypso UART inputs
Mychaela Falconia <falcon@freecalypso.org>
parents:
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11 GND 10 |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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12 Y:7 11 |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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13 Y:6 12 |
975b9b7ec712
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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14 Y:5 13 |
975b9b7ec712
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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15 Y:4 14 |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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16 Y:3 15 |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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17 Y:2 16 |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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18 Y:1 17 |
975b9b7ec712
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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19 Y:0 18 |
975b9b7ec712
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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20 nOE2 19 |
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parents:
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21 Vcc 20 |