Switch 2: Hardware

2025-08-18T19:33:07Z

Retr0id: fix broken T239 link

= Motherboard =
== Nintendo Switch 2 ==
{| class="wikitable" border="1"
|-
! Product Code || Description
|-
| BEE-CPU-01 || Retail Nintendo Switch 2
|}

=== DRAM Layout ===
The footprint is BGA-441 (JEDEC [https://www.jedec.org/standards-documents/docs/mo-342a MO-342]), with ballout defined by JEDEC [https://www.jedec.org/standards-documents/docs/jesd209-5c JESD209-5C] (LPDDR5X). This annotated image shows the signals routed on the top layer of the PCB, for the IC south of the SoC. The signals routed here are CS0-1, CA0-6, and CK, for each of the four channels.

[[File:Dram traces annotated.jpg|frameless|619x619px]]

= Specifications =
== Nintendo Switch 2 ==
{| class="wikitable" border="1"
|-
! Component || Description
|-
| SoC || NVIDIA GMLX30-A1 ([[Switch_2:_Tegra_T239|T239]])
|-
| Screen || Innolux ZD079KA-03A
|-
| Storage || Toshiba/Kioxia THGJFGT1E45BAILHW0 256 GB UFS 3.1 <br/> or <br/> SKhynix HN8T15DEHKX075 256 GB UFS 3.1
|-
| Memory || SKhynix H58GE6AK8BX107 6 GB LPDDR5X DRAM x2 (12GB total)
or
Samsung K3KL2L20DM-JGCT 6 GB LPDDR5X DRAM x2 (12GB total)
|-
| Wifi/BT || MediaTek MT3681AEN (same footprint and similar pinout to [https://www.digikey.com/en/products/detail/mediatek/MT7921LEN-B/24633572 MT7921LEN])
|-
| PMIC || Maxim Integrated MAX77851SAWJ+T
|-
| Sub-PMIC || Renesas/Dialog DA9092-AIOV2
|-
| Audio || Realtek ALC5658
|-
| Voice || Intelligo Technology IG2200
|-
| USB 2.0 Hub || Genesys Logic GL852G-OHY60 (Connects to joycons, WiFi/BT IC, with upstream port to SoC)
|-
| USB-C || Cypress CYPD6228-96BZXI (CP10359AT)
|-
| GC ASIC || B2349 GCBRG HAC STD T2010423
|}

File:Dram traces annotated.jpg

2025-08-18T19:30:11Z

Retr0id:

Testpads

2019-03-05T00:58:06Z

Retr0id: Cluster C pad 11 is a 1v8 power rail

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 B ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || || DBVDD || || || || from ALC5639 pin 43
|-
| 2 || D+ || USB-C || || || || Cluster B - 3
|-
| 3 || D- || USB-C || || || || Cluster B - 2
|-
| 4 || +3.3V || XRST || || || || from M92T36 pin 4
|-
| 5 || +3.3V || VSVR || || || || from M92T36 pin 6
|-
| 5(b) || VUSB || VB || || || || from M92T36 pin 9
|-
| 6 || GND || || || || ||
|}

=== 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 TX || || 0-1.8V || || ||
|-
| 3 || UART-A RX || || 0-1.8V || || ||
|-
| 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 || +1.8V || || 0-1.8V || || ||
|}

=== Cluster D ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || GND || || || || ||
|-
| 4 || Seaker L + || || || || || Speaker Left +
|-
| 5 || Seaker L - || || || || || Speaker Left -
|}

=== Cluster E ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || Vol (-) || || || || || Button Vol (-)
|-
| 10 || Reset || || || || ||
|-
| 11 || Vdd Referance|| || || || ||
|}

=== Cluster G ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 2 || GND || || || || ||
|-
| 4 || Vol(+) || || || || || Button Vol (+)
|-
| 5 || Li-Ion Batt Vdd Mirror || || || || || Power Supply
|-
| 9 || BUTTON_HOME || || || || || RCM strap
|}

=== 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? ||
|-
| 4 || || UART || 0-1.8V || || 1.5MBaud? ||
|-
| 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 || D- || USB-C || || || || Cluster B - 3
|-
| 3 || D+ || USB-C || || || || Cluster B - 2
|-
| 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 || || || || support fast charger : "normal mode = 5V+" "Fast changer = 12V+"
|-
| 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%
|-
| 6 || GND || || || || ||
|}

Nintendo Switch Brew - User contributions [en]

Switch 2: Hardware

File:Dram traces annotated.jpg

Testpads