Document ID: MIPI-SPMI-RPT-001
Version: 1.0
Date: [Current Date]
Author: [Your Name/Department]
┌────────────┐ SPMI Bus ┌─────────────┐
│ Master │◄──────────────────►│ Slave 1 │
│ (e.g., AP) │ │ (PMIC) │
└────────────┘ └─────────────┘
│ │
│ │
▼ ▼
┌────────────┐ ┌─────────────┐
│ Slave 2 │ │ Slave 3 │
│ (Voltage │ │ (Clock Gen) │
│ Regulator) │ └─────────────┘
└────────────┘
Typical Use Case: Application processor (master) sends a command to the PMIC (slave) to lower CPU voltage during idle — all over SPMI.
For detailed specifications, including protocol layers, register maps, and implementation guidelines, you would typically refer to the official MIPI SPMI specification document. This document is usually available on the MIPI Alliance website (www.mipi.org) and may require registration or a specific request to access.
The MIPI SPMI specification covers:
The SPMI bus consists of two wires:
The PDF details:
Key takeaway from the PDF: SPMI supports a "collision detection" mechanism, allowing multiple masters (e.g., a modem and an AP) to coexist on the same bus. mipi spmi specification pdf
The MIPI Alliance uses a tiered access model:
To get the PDF, visit the official MIPI Alliance website → Specifications → System Power Management Interface (SPMI) → Submit a request.
Before downloading the MIPI SPMI specification PDF, you must understand the problem it solves. Document ID: MIPI-SPMI-RPT-001 Version: 1
Historically, application processors (APs) communicated with PMICs via legacy interfaces like I2C, SPI, or even discrete GPIOs. These methods had significant drawbacks:
MIPI SPMI was designed as a two-wire, low-latency, high-speed serial interface specifically for power management. It is a hardware interface plus a command protocol that allows an application processor to read/write registers on multiple PMICs using a single bus.
The specification is maintained by the MIPI Alliance. Without the official MIPI SPMI specification PDF, implementing a compliant device is virtually impossible because the timing diagrams, electrical characteristics, and command structures are strictly defined. Typical Use Case: Application processor (master) sends a