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Documenting the Nintendo Switch hardware, software, and development.

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hardware:testpads

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Testpads

The Nintendo Switch mainboard has a series of testpads on the front and back, presumably used in factory test, diagnostics, and early board bringup procedures.

Raw Logic captures

These are reference materials, taken from poking at I/O on various testpads. https://github.com/hedgeberg/Switch-Logic-Captures

Photos

Pinouts

Cluster A

Pad #Name Type Levels ContinuityFrequencyComment
1 Batt GND?
2 Battery pulse? Pulse train 0-3.3V L-5?
3 Battery Vdd
4 ?? Square wave 0-3.3V 329kHz?
(undersampled?)		Square wave when screen on, but looks like vias to Speaker R
5 ?? Square wave 0-3.3V 329kHz?
(undersampled?)		Square wave when screen on, but looks like vias to Speaker R
6 Weak GND?
7 SDA I2C0-1.8V
8 SCL I2C0-1.8V
9 USB-PWR-WAVE? Square wave 0-3.3V K-4, K-5? ~11 Hz
10 USB-PWR-WAVE? Square wave 0-3.3V K-4, K-5? ~11 Hz

Cluster C

Pad #Name Type Levels ContinuityFrequencyComment
1 ?? 0-1.8V No clue. This is definitely important, we just have no idea how. May need to interface with dock for comms.
2 UART-A rx 0-1.8V thanks to shuffle2
3 UART-A tx 0-1.8V thanks to shuffle2
4 ?? 0-1.8V
5 ?? 0-1.8V
6 ?? 0-1.8V
7 ?? 0-1.8V
8 ?? 0-1.8V
9 ?? 0-1.8V
10 ?? 0-1.8V
11 ?? 0-1.8V

Cluster E

DON'T FUCK WITH CLUSTER E.

cf. 1)

Pad #Name Type Levels ContinuityFrequencyComment
10 Reset

Cluster I

Pad #Name Type Levels ContinuityFrequencyComment
1 GND
2 Screen_on On/Off 0-1.8V Screen power state, active high
3 UART 0-1.8V 1.5MBaud?needs testing with screen plugged in
Sends string ‘Nintendo Switch’ + some stuff
long string of 00
4 UART 0-1.8V 1.5MBaud?needs testing with screen plugged in
some kind of call/response for pad I-3
5 Flow control0-1.8V Flow control for pad I-4?
6 0-1.8V Needs testing with chip/touch screen interface board plugged in

Cluster J

Pad #Name Type Levels ContinuityFrequencyComment
1 ? Edge 0-1.8V Turns on around same time as pad J-3
2 GND
3 ? Edge 0-1.8V Turns on around same time as pad J-1, slightly after
4 Power button Pushbutton 4V-0V Active low
5 ? Constant? 0V Ground?-NT
6 ? Edge 0-1.8V Turns on with pad J-6, ~1s after J-1/J-3
7 ? Edge 0-1.8V Turns on with pad J-5, ~1s after J-1/J-3
8 ? Edge? 0-1.8V Turns on ~1s after J-6/J-7, turns off at unknown point

Cluster K

Pad #Name Type Levels ContinuityFrequencyComment
1 GND
2 Unknown ?? 3.3V-0V None knownN/A? Falls around same time pad K-7 falls, but immediately. No data observed as of yet.
3 Unknown
4 USB-PWR-WAVE? Square wave 0-3.3V A-9, A-10?~11 Hz
5 USB-PWR-WAVE? Square wave 0-3.3V A-9, A-10?~11 Hz Appears to mirror K4
Duty cycle 66.67%
Low on screen lock
Off until first interaction
6 USB-C V+ Supply Power
7 Unknown Power Supply?~3V-0V None knownN/A 0 when usb-c not plugged in, falls slowly on first interaction if USB-C plugged in. Power draw related?

Cluster L

TODO: update diagram

Pad #Name Type Levels ContinuityFrequencyComment
1 Li-Ion Batt Vdd MirrorPower Supply Std. Li-Ion Appears to be output of a regulator but mirrors battery level perfectly
2 GND
3 Li-Ion Batt Vdd Battery InputStd. Li-Ion
4 Mirrored Ground? 0V holds steady @ 0, looks like a decoupled isolated ground
5 Battery pulse? <1 Hz Duty Cycle ~0%
1)
JESUS CHRIST JUST DON'T DO IT.
hardware/testpads.txt · Last modified: 2018/01/10 22:01 by hedgeberg

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