hardware:testpads
Table of Contents
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 | Continuity | Frequency | Comment |
|---|---|---|---|---|---|---|
| 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 | I2C | 0-1.8V | |||
| 8 | SCL | I2C | 0-1.8V | |||
| 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 | Continuity | Frequency | Comment |
|---|---|---|---|---|---|---|
| 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 | Continuity | Frequency | Comment |
|---|---|---|---|---|---|---|
| 10 | Reset |
Cluster I
| Pad # | Name | Type | Levels | Continuity | Frequency | Comment |
|---|---|---|---|---|---|---|
| 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 control | 0-1.8V | 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 | Continuity | Frequency | Comment |
|---|---|---|---|---|---|---|
| 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 | Continuity | Frequency | Comment |
|---|---|---|---|---|---|---|
| 1 | GND | |||||
| 2 | Unknown | ?? | 3.3V-0V | None known | N/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 known | N/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 | Continuity | Frequency | Comment |
|---|---|---|---|---|---|---|
| 1 | Li-Ion Batt Vdd Mirror | Power Supply | Std. Li-Ion | Appears to be output of a regulator but mirrors battery level perfectly | ||
| 2 | GND | |||||
| 3 | Li-Ion Batt Vdd | Battery Input | Std. 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
