Pinout mismatch for Mainboard and Input Cover

[SBCV-apegram]

See Input Cover with 22 pins and Mainboard with 20 pins. I believe the first two pins are duplicated on the Input Cover page.

[jayasafunctionofe]

the 22 pins for "InputCover#Touchpad-pcb-to-mainboard" is for the flex connector, not the pogo pins. The touchpad flex is actually 22 pins.

[SBCV-apegram]

I see the distinction now. I still think it might make things clearer to point out that the signals are duplicated on 1-2 and 3-4, since the daughterboard ends up mapping 22 down to 20.

[jayasafunctionofe]

(disclaimer, i don't work for framework)

I see what you're saying. We'll have to wait and see if the framework team adds a note about this.

FWIW, when i'm reverse engineering hardware i find it helpful to create a pin to pin mapping table, especially when going between differently numbered interfaces like this.

Pogo Pin	Signal	Notes	Touchpad Pin
1	5VS_TP		1
2	5VS_TP		1
3	KBL_P		2
4	KBL_P		2
5	3VS_TP		3
6	TP_I2C_CLK	Touchpad I2C	4
7	TP_I2C_SDA	Touchpad I2C	5
8	TP_INT#		6
9	BOARD_ID		7
10	KB_I2C_SCL	Keyboard I2C	8
11	KB_I2C_SDA	Keyboard I2C	9
12	KB_INT	Keyboard I2C	10
13	KSI_03_IN	Shorted to pin 2	1
14	KSI_03_OUT	Shorted to pin 1	2
15	KSI_02_IN	Shorted to pin 4	3
16	KSI_02_OUT	Shorted to pin 3	4
17	KSI_00_IN	Shorted to pin 6	5
18	KSI_00_OUT	Shorted to pin 5	6
19	GND		7
20	GND		8
21	GND		9
22	GND		10

i don't have a FW12 in hand to test, but based on the photos online, the existing tables, and prior experience working with flex interfaces, pins 1+2 and 3+4 are 'duplicated' because they're for power. the traces on the flex for these two "pins" look to be wider, likely to prevent them from burning out with 5v being pushed across the traces.

[JohnAZoidberg]

the 22 pins for "InputCover#Touchpad-pcb-to-mainboard" is for the flex connector, not the pogo pins. The touchpad flex is actually 22 pins.

This is correct.