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Application NoteNxp

Using Sleep Mode on the MPC5668x

Technical guide for implementing sleep mode on NXP MPC5668x MCUs, covering power modes, wake-up source configuration, and power transitions for automotive applications.

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Overview

This application note describes how to utilize the low power sleep mode on the NXP MPC5668x series dual-core microcontrollers, including the MPC5668E and MPC5668G. It explains the Clock, Reset, and Power (CRP) module's role in managing power gating, which eliminates static leakage by powering down non-essential logic while maintaining wake-up monitoring and optional SRAM retention. The document provides detailed procedures for configuring wake-up sources such as the Real Time Counter (RTC), Autonomous Periodic Interrupt (API), and 32 external pin transitions. It also covers the internal and external clock source options, the sequence for entering and exiting sleep mode, and software strategies for automotive gateway and body control applications.

Use Cases

  • Reducing power consumption in automotive electronic systems when the vehicle is parked or idle.
  • Implementing single-chip solutions for high-performance automotive gateway and body control applications.
  • Configuring timed or external event-driven wake-up sequences from low-power states.
  • Maintaining critical system data during sleep cycles using configurable SRAM power retention.

Topics

MPC5668x
MPC5668E
MPC5668G
Low Power Mode
Sleep Mode
Power Gating
CRP Module
RTC
Autonomous Periodic Interrupt
Automotive Gateway
Body Control
Microcontroller

Referenced Parts

MPC5668E

NXP

MPC5668x includes MPC5668E and MPC5668G

MPC5668G

NXP

MPC5668x includes MPC5668E and MPC5668G

MPC5668x

NXP

The dual core MPC5668x1 microcontrollers (MCU) have been developed to address the needs of high end automotive gateway and body control applications.