Every device on the bus is assigned a unique priority level. Master devices generally hold higher priority than slave devices.
Always check the version year on the MIPI website. If you design for a modern Snapdragon or MediaTek chip, you likely need v3.0 or later.
Up to (e.g., Application Processor, Modem DSP, Sensor Hub). mipi spmi specification pdf
Slave devices can also request attention from a master by initiating an interrupt sequence on the bus. The bus arbitrates between slave interrupt requests based on their Slave ID (SID).
: Supports multi-master and multi-slave topologies, accommodating up to on a single shared bus. Voltage Standards : Typically operates within 1.2V or 1.8V CMOS I/O ranges to reduce overall power consumption. Key Performance Features Every device on the bus is assigned a unique priority level
Disclaimer: This article is for informational purposes. The MIPI Alliance reserves all rights to its specifications. Always obtain official documents directly from MIPI for product development.
By providing a unified standard for components from different manufacturers, MIPI SPMI offers several industry advantages: Space Savings If you design for a modern Snapdragon or
Implementing MIPI SPMI in a device architecture offers distinct advantages over legacy protocols: Legacy Interfaces (I2C / SPI) High (Requires extra interrupt GPIOs) Minimal (Strictly 2 wires) Latency Medium to High Ultra-Low (High-speed arbitration) Multi-Master Complex or unsupported Native (Up to 4 masters) Interrupts Dedicated hardware lines required In-band signaling via SDA line
While SPMI is a powerful tool for power management, it's often compared to other MIPI standards. The table below clarifies its unique role: