手机和其他便携式电子设备的复杂性和性能要求呈指数级增长。随着对新的高性能、高数据速率功能的需求增加，系统级电源管理变得至关重要。使用先进的电源管理技术来降低功耗并延长电池寿命比以往任何时候都更加重要。 系统电源管理接口 (SPMI) 是一种 MIPI 标准接口，可将片上系统处理器系统 (SoC) 的集成电源控制器 (PC) 与一个或多个 PMIC 电压调节系统 (电源管理集成电路) 连接起来。借助 SPMI，系统可以使用单个 SPMI 总线动态调整 SoC 内电压范围的电源和基板偏置。 为了最大限度地降低便携式电子设备中数字处理器的功耗，系统和 IC 设计人员使用先进的电源管理技术。

MIPI 联盟 SPMI system power management interface 学习总结, 用于连接PMIC和SOC

This SPMI Specification defines the operating states, the command set, the physical interface, and the protocol data communication between SPMI devices on a SPMI bus to insure the compatibility of command and data transfers. The SPMI Command Sequence set includes Slave and Master addressing, control of the Slave operating state, register read from and register write to Master and Slave devices, as well as commands supporting the use of MIPI Device Descriptor Block data read and bus management.

This document is a Draft MIPI Specification. MIPI member companies’ rights and obligations apply to this Draft MIPI Specification as defined in the MIPI Membership Agreement and MIPI Bylaws. An updated Frequently Asked Questions (FAQ) document has been prepared by the SPM Working Group for SPMI v2.0 Specification implementers. Also, a SPMI v2.0 Protocol Implementation Conformance Statement (PICS) document has been prepared by the SPM Working Group. The SPMI v2.0 Specification contains the following major changes with respect to SPMIv1.0: • Unified memory map for Slave Device. • Command acknowledgement (ACK/NACK) for Write commands where required. • System behavior upon detection of a parity error in an RCS Device-initiated Command Frame.

SPMI协议理解文档，可以帮助快速理解SPMI，典型应用(Qcom PMIC/PMI)。