AN3316 datasheet(8/42 Pages) STMICROELECTRONICS

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Power consumption factors

AN3316

8/42

Doc ID 18232 Rev 2

Notice that Power Domains shown on Figure 3 are related to SPC560B54/6x, where:

●

Power Domain PD0:

–always on

–

wakeup peripheries like the CAN sampler, the RTC, API, etc.

–

minimum RAM segment (8 K)

●

Power Domain PD1:

–

contains all cores and the majority of peripherals

–

can be turned off in STOP or STANDBY modes

–

must be turned on in RUN modes (although there is a clock gating option for all

peripherals and also a WAIT instruction for the cores to reduce power)

●

Power Domain PD2:

–

additional RAM segment (24 K)

●

Power Domain PD3:

–

additional RAM segment (64 K)

–

not supplied in standby mode, but implemented to use it in other LP-modes to

reduce leakage

On the other hand, to minimize static power contribution on application side, user should

●

Turn-off CPU when possible, using the following autonomous "smart" peripherals:

–

API — Autonomous Periodic Interrupt that allows device to recover from very low

power state at selected time intervals

–

RTC — Real Time Clock that offers precision time keeping functionality in very low

power state

–

ADC — Analog Digital Converter with continuous conversion while running in low

power and triggering wake-up when signal reaches certain level

–

DMA — Direct Memory Access that allows data transfer between peripherals

minimising CPU activity

–

SCI — Intelligent LIN management that minimizes CPU interrupts and CPU clock

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