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.

/*
 * This module encapsulates the battery charging circuit.
 */

module charging_circuit (VCHG, VBAT, ICTL, PCHG, VCCS, VBATS);

input VCHG;
inout VBAT;

input ICTL, PCHG;
output VCCS, VBATS;

wire mid1, mid2;

Si9407AEY Q401 (.G(ICTL), .S(VCHG), .D(mid1));
capacitor C401 (ICTL, VCHG);

resistor Rprech (PCHG, mid1);

misc_diode D404 (.A(mid1), .C(mid2));

resistor_with_sense Rmeas (.side1_current(mid2),
			   .side1_sense(VCCS),
			   .side2_current(VBAT),
			   .side2_sense(VBATS)
	);

endmodule