SWCU192 User guide

SWCU192 November 2021 CC1312R7 , CC1352P7 , CC2652P7 , CC2652R7

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8.1 Introduction

Power and clock management (PRCM) in the CC13x2x7 and CC26x2x7 device platform is highly flexible to facilitate low-power applications. The following sections describe details for clock and power control in addition to covering reset features.

The features in this chapter are embedded and optimized in TI-RTOS. TI-RTOS users may regard this chapter as informative only.

Figure 8-1 shows the hierarchy of power-saving features in the CC13x2x7 and CC26x2x7 device platform. Low-power consumption and cycling time for a power-saving mode is inversely proportional. The power-saving mode with the lowest power consumption requires the longest time from initiation to power-saving mode, as well as wake-up time back to active mode. Table 8-1 summarizes the power-saving features.

Figure 8-1 Hierarchy of Power Saving Features

Table 8-1 Power Saving Features

Power-Saving Feature	Description
Clock gating	Immediate response—no latency. This feature offers the least amount of power saved
Power domain off (overrides clock gating)	Power cycling down and up takes longer time than clock gating. Modules in power domains without retention must be reinitialized before functionality can be resumed.
Voltage regulator off	Power cycling down and up takes a longer time than power domain cycling. The CC13x2x7 and CC26x2x7 device platform loses all configurations and will boot at wake up. This feature offers the least possible current consumption.

Table 8-2 lists the four defined power modes for the power-saving features in TI-RTOS listed in Table 8-1. Section 8.6 discusses the power modes in detail.

Table 8-2 Power Modes in TI-RTOS

Power Mode	Description
Active mode	The system CPU is running.
Idle mode	The CPU power domain is powered off.
Standby mode	All power domains are powered off, and the AUX domain is in low-power or power-down mode. The voltage domains are supplied by the micro LDO.
Shutdown mode	Only I/Os maintain their operation. All voltage regulators, voltage domains, and power domains are off.