---
title: iPod Shuffle 3rd Gen attempts
date: 2025-12-11
modified: 2025-12-11
draft: true
---
Parts:
- Charging Circuit
	- ![](Pasted%20image%2020251211153204.png)
	- Inputs:
		- Seems to take 5V 
	- Outputs
		- VBAT to Battery? (is that what the connection to BAT0 does??)
		- VCC (3V) to system
- Battery
	- Input: VBAT??
	- Output: VBAT??
- MicroSD card Reader
	- **Inputs**:
		- VBUS? VSYS?
		- CLK
		- DI
		- CS
		- CD???
		- VCC
	- **Outputs**:
		- DO
- TRRS Jack
	- Outputs:
		- Sleeve (is this analog or digital, if we're only checking for button press)
		- Right (Analog)
		- Left (Analog)
		- RSw/LSw (floats when plug is inserted, why are there two? Mono?)
- BT Chip + Antenna (Built into SoC, assuming ESP32-S3)
	- Inputs:
	- Outputs:
- Switch
	- Output state
- LED
	- Input State
- SoC
	- Assuming ESP32-S3
		- Outputs:
			- CLK
			- CS
			- TRRS Left (Analog)
			- TRRS Right (Analog)
			- SD DI
			- LED
			- USB D+/D-
		- Inputs:
			- TRRS Sleeve (Analog?)
			- SD DO
			- VCC
			- Switch
			- USB D+/D-
			- LSw, RSw (?)
- USB-C Port
	- ![](Pasted%20image%2020251211153401.png)
	- Outputs VBUS(5V?), USB D+/-