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From reswitched wiki
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 ==
[[File:Switchre_side1.jpg|200px]]
[[File:Switchre_side2.jpg|200px]]
== Pinouts ==
=== Cluster A ===
{| class=wikitable
! 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 ===
{| class=wikitable
! 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-B RX || || 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.
{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 10 || Reset || || || ||
|}
=== Cluster I ===
{| class=wikitable
! 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 ===
{| class=wikitable
! 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 ===
{| class=wikitable
! 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 || 0V-3.3V || A-9, A-10? || ~11 Hz ||
|-
| 5 || USB-PWR-WAVE? || Square wave || 0V-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
{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || Li-Ion Batt Vdd Mirror || Power Supply || Std. Li-Ion || || ||
|-
| 2 || GND || || || || ||
|-
| 3 || Li-Ion Batt Vdd || Battery Input || Std. Li-Ion || || ||
|-
| 4 || Mirrored Ground? || || || || || Holds steady @ 0, looks like a decoupled isolated ground
|-
| 5 || Battery pulse? || || || || <1 Hz || Duty cycle ~0%
|}
== Raw Logic captures ==
These are reference materials, taken from poking at I/O on various testpads. https://github.com/hedgeberg/Switch-Logic-Captures
== Photos ==
[[File:Switchre_side1.jpg|200px]]
[[File:Switchre_side2.jpg|200px]]
== Pinouts ==
=== Cluster A ===
{| class=wikitable
! 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 ===
{| class=wikitable
! 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-B RX || || 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.
{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 10 || Reset || || || ||
|}
=== Cluster I ===
{| class=wikitable
! 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 ===
{| class=wikitable
! 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 ===
{| class=wikitable
! 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 || 0V-3.3V || A-9, A-10? || ~11 Hz ||
|-
| 5 || USB-PWR-WAVE? || Square wave || 0V-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
{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || Li-Ion Batt Vdd Mirror || Power Supply || Std. Li-Ion || || ||
|-
| 2 || GND || || || || ||
|-
| 3 || Li-Ion Batt Vdd || Battery Input || Std. Li-Ion || || ||
|-
| 4 || Mirrored Ground? || || || || || Holds steady @ 0, looks like a decoupled isolated ground
|-
| 5 || Battery pulse? || || || || <1 Hz || Duty cycle ~0%
|}