Some chip vendors (Qualcomm, MediaTek, TI) include extracts of the SPMI spec in their technical reference manuals (TRMs). While not complete, these are often sufficient for register-level programming. Look for PDFs named PMIC-xxx-Architecture-v2.0.pdf .
Without the official PDF, any implementation risks violating timing constraints or command structures, leading to erratic PMIC behavior, battery drain, or even hardware damage. mipi spmi specification pdf
: Supports both Low Speed (32 kHz to 15 MHz) and High Speed (32 kHz to 26 MHz) operations. Some chip vendors (Qualcomm, MediaTek, TI) include extracts
Obtaining the is essential for any engineer implementing this bus. The document, typically titled MIPI Alliance Specification for System Power Management Interface (SPMI) , is comprehensive. It is a highly technical volume that requires a solid understanding of digital communication protocols to fully decipher. Without the official PDF, any implementation risks violating
| Feature | Description | |---------|-------------| | | Low-pin-count, low-speed bus for power management control (e.g., between application processor and PMIC) | | Topology | Single-master or multi-master, multiple slaves | | Signals | 2 wires: SCLK (clock) and SDATA (data) | | Speed | Up to 4.8 MHz (typically 1–4 MHz) | | Addressing | 4-bit slave address + 8-bit register address | | Command types | Register read/write, extended register read/write, reset, sleep/wakeup | | Error handling | CRC protection for data integrity | | Low power | Supports sleep mode with wakeup commands |
Once you acquire the official PDF (typically named MIPI_Alliance_System_Power_Management_Interface_Specification_vX.X.pdf ), what will you find? Let’s walk through the key sections.