FreeCalypso > hg > freecalypso-schem2
annotate venus/src/periph/Si9407AEY.v @ 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> |
|---|---|
| date | Thu, 02 Dec 2021 22:40:39 +0000 |
| parents | 74a89c0a6466 |
| children |
| rev | line source |
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Venus MCL: add Q401 charging circuit MOSFET
Mychaela Falconia <falcon@freecalypso.org>
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1 /* |
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Mychaela Falconia <falcon@freecalypso.org>
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2 * This Verilog module encapsulates a MOSFET in a Si9407AEY-compatible |
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Mychaela Falconia <falcon@freecalypso.org>
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3 * SOIC-8 footprint. |
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4 */ |
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5 |
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6 module Si9407AEY (G, S, D); |
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7 |
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8 input G, S; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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9 output D; |
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10 |
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parents:
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11 /* instantiate the package; the mapping of signals to pins is defined here */ |
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12 |
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13 pkg_IC_8pin pkg (.pin_1(S), |
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14 .pin_2(S), |
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15 .pin_3(S), |
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16 .pin_4(G), |
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17 .pin_5(D), |
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18 .pin_6(D), |
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19 .pin_7(D), |
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20 .pin_8(D) |
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21 ); |
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22 |
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23 endmodule |
