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| Group | Balls | Description | |-------|-------|-------------| | | A1, A2, B1, B2, etc. | VCC (NAND), VCCQ (I/O & Controller), VCCQ2 (optional 1.8V) | | Ground | Multiple | VSS | | UFS Interface | C3, C4, D3, D4 | D0_RX , D0_TX , D1_RX , D1_TX (two lanes) | | Control | A4, A5 | REF_CLK , RST_N | | Boot/Init | B3 | C/D (Boot mode / configuration) |
UFS 3.1 devices use , each feeding a different internal domain:
Data Input 0 (True/Complement). Differential data input lane 0.
. This design choice significantly reduces the number of signal pins, which simplifies PCB routing and minimizes electromagnetic interference (EMI). Critical Signal Groups in UFS 3.1 ufs 3.1 pinout
UFS 3.1 leverages a multi-voltage power delivery system to optimize performance and energy efficiency. Unlike older standards that might use a single voltage, UFS distributes power to distinct internal modules.
| Rail | Voltage | Ripple max | Typical current (active) | Purpose | |------|---------|------------|--------------------------|---------| | | 2.5V – 3.6V | 100 mV | Up to 1.5A | NAND flash core | | VCCQ | 1.14V – 1.26V | 50 mV | 200-400 mA | Controller logic & UniPro PHY | | VCCQ2 | 1.7V – 1.95V or NC | 50 mV | ~100 mA | Optional for 1.8V I/O (e.g., UFS-to-host sideband) |
| Pin Number | Pin Name | Description | | --- | --- | --- | | 1 | VDD | Power supply voltage | | 2 | VSS | Ground | | 3 | REFCLK | Reference clock | | 4 | REFCLK | Reference clock (complement) | | 5 | DNC | Do not care (reserved) | | 6 | DNC | Do not care (reserved) | | 7 | RXD0 | Receive data 0 | | 8 | RXD1 | Receive data 1 | | 9 | RXD2 | Receive data 2 | | 10 | RXD3 | Receive data 3 | | 11 | TXD0 | Transmit data 0 | | 12 | TXD1 | Transmit data 1 | | 13 | TXD2 | Transmit data 2 | | 14 | TXD3 | Transmit data 3 | | 15 | CBT | Control signal ( Command, BE and Transfer) | | 16 | VSS | Ground | Unlike older standards that might use a single
By understanding the UFS 3.1 pinout and its architecture, designers, engineers, and developers can take advantage of the latest storage technologies and develop high-performance storage systems that meet the demands of today's applications.
Always remove the battery before soldering jumper wires to the ISP points. Use a multimeter to check for shorts, and work under a microscope to avoid bridging adjacent pads.
UFS 3.1 relies on the MIPI M-PHY physical layer, which uses differential pairs for data transmission. troubleshooting a dead phone
| Ball | Signal | Type | Description | |------|--------|------|-------------| | A1 | VCC | Power | NAND flash core power (2.5V - 3.6V, typically 3.3V) | | A2 | VCC | Power | Same as A1 – connect together | | A4 | REF_CLK | Input | Reference clock (26 MHz typical, 19.2 / 38.4 MHz possible) | | A5 | RST_N | Input | Hardware reset (active low, internal pull-up) | | B1 | VCC | Power | NAND core power | | B2 | VCC | Power | NAND core power | | B3 | C/D | Input | Configuration / Boot mode. Pull high (VCCQ) for normal boot, low for test modes. | | B4 | VSS | Ground | Ground | | B5 | VSS | Ground | Ground | | C1 | VCCQ | Power | Controller I/O & logic (1.14V - 1.26V typical 1.2V) | | C2 | VCCQ | Power | Same as C1 | | C3 | D0_RX | Input | Lane 0 – Receiver differential input (from host) | | C4 | D0_TX | Output | Lane 0 – Transmitter differential output (to host) | | D3 | D1_RX | Input | Lane 1 – Receiver differential input | | D4 | D1_TX | Output | Lane 1 – Transmitter differential output | | D5 | VSS | Ground | Ground | | E1 | VCCQ2 | Power | Optional second I/O supply (1.8V or 2.5V). If unused, tie to VCCQ or leave NC. | | ... (center balls omitted) | ... | ... | Most balls in rows E–J / cols 3–10 are reserved or not connected | | L2 | VSS | Ground | Ground | | M1 | VSS | Ground | Ground |
Universal Flash Storage (UFS) 3.1 is the standard for high-performance storage in modern smartphones, tablets, and embedded systems. Offering significantly faster read/write speeds, lower power consumption, and improved efficiency compared to older eMMC or earlier UFS versions, UFS 3.1 relies on a precise, serialized interface to deliver its capabilities.
The UFS 3.1 pinout is not just a random arrangement of balls—it is a carefully engineered high-speed serial interface that demands respect for differential signaling, multiple power domains, and vendor-specific strapping. Whether you are designing a PCB, repairing a flagship device, or attempting forensic data extraction, understanding the key pins (REF_CLK, RST_n, RX/TX pairs, and power rails) will save you hours of troubleshooting and prevent costly chip damage. Always verify your pinout against the component datasheet before applying power, and remember: in the world of UFS, assumptions are the mother of all failures.
For hardware engineers, PCB designers, and data recovery technicians, understanding the is not just a theoretical exercise; it is a practical necessity. Whether you are designing a next-generation device, troubleshooting a dead phone, or attempting direct memory access for forensic analysis, the 153-ball BGA (Ball Grid Array) pinout is your roadmap.
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